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Form No. 6107A ACDR-B/AUDR-B Air-Cooled Chillers with Reciprocating Compressors ACDR-B/AUDR-B 021-200 Installation, Operation & Maintenance Manual

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Form No. 6107A

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ACDR-B/AUDR-B

Air-Cooled Chillerswith Reciprocating CompressorsACDR-B/AUDR-B 021-200Installation, Operation &Maintenance Manual

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TABLE OF CONTENTS ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

Page1.0 General Information

1.1 Introduction................................................................................................................................ 51.2 Product Identification ................................................................................................................51.3 Physical Specifications - English I.P. Units ............................................................................. 6-111.4 Physical Specifications - S. I. Units ...................................................................................... 12-17

2.0 Installation2.1 General Installation Instructions .............................................................................................. 182.2 Inspection ................................................................................................................................. 182.3 Handling, Storage and Rigging ................................................................................................ 18

2.3.1 General Handling Instructions .......................................................................................................... 182.3.2 Storage ............................................................................................................................................ 182.3.3 Rigging and Moving ......................................................................................................................... 18

2.3.3.1 Rigging Instruction Drawing ........................................................................................... 182.4 Space and Clearance Requirements

2.4.1 General Space and Clearance Requirements .................................................................................... 192.4.2 Location and Installation Clearance ................................................................................................. 202.4.3 ACDR-B and AUDR-B Dimensional Data ....................................................................................... 21-28

2.5 Foundation and Mounting Structure2.5.1 ACDR-B Unit Weights and Point Loading - Aluminum Fin Condenser Unit ....................................... 292.5.2 ACDR-B Unit Weights and Point Loading - Copper Fin Condenser Unit ............................................ 302.5.3 AUDR-B Unit Weights and Point Loading - Aluminum Fin Condenser Unit ....................................... 312.5.4 AUDR-B Unit Weights and Point Loading - Copper Fin Condenser Unit ............................................ 32

2.6 Vibration Isolation Requirements2.6.1 ACDR-B Rubber-in-Shear - with Aluminum Fin Condenser ................................................................ 332.6.2 ACDR-B Rubber-in-Shear - with Copper Fin Condenser ..................................................................... 342.6.3 ACDR-B Spring Isolators - with Aluminum Fin Condenser ................................................................ 352.6.4 ACDR-B Spring Isolators - with Copper Fin Condenser ..................................................................... 362.6.5 AUDR-B Rubber-in-Shear - with Aluminum Fin Condenser .............................................................. 372.6.6 AUDR-B Rubber-in-Shear - with Copper Fin Condenser ................................................................... 382.6.7 AUDR-B Spring Isolators - with Aluminum Fin Condenser ................................................................ 392.6.8 AUDR-B Spring Isolators - with Copper Fin Condenser ..................................................................... 40

2.7 Piping Connections: ACDR-B / AUDR-B .................................................................................... 412.7.1 ACDR-B Chilled Water Piping ............................................................................................................ 41

2.7A Typical Chilled Water Piping - Three Way Bypass ............................................................. 432.7B Typical Chilled Water Piping - Two Way Bypass ............................................................... 43

2.7.2 Multiple Chiller Water Piping ........................................................................................................... 412.7.2.1 Parallel Multiple Chiller Water Piping .............................................................................. 412.7C Typical Parallel Chiller Chilled Water Piping ..................................................................... 432.7.2.2 Series Multiple Chiller Water Piping ................................................................................ 422.7D Typical Series Chiller Chilled Water Piping ....................................................................... 43

2.7.3 ACDR-B Chilled Water Quality .......................................................................................................... 422.7.4 AUDR-B Condensing Unit Connections ............................................................................................. 42

2.7.4.1 General Condensing Unit Connections Applications ....................................................... 422.7E Condensing Unit Typical Hot Gas Bypass Piping .............................................................. 43

2.8 Electrical Connections: ACDR-B / AUDR-B ................................................................................ 442.8.1 Electrical Data Table - Unit ..................................................................................................... 45,47,492.8.2 Electrical Data Table - Field ..................................................................................................... 46,48,502.8.3 General Electrical Notes .............................................................................................................. 49-50

2.9 Refrigerant Charging Procedure .............................................................................................. 512.9.1 General Refrigerant Charging Procedures ........................................................................................ 512.9A Refrigerant Line Capacities .............................................................................................................. 512.9.2 AUDR-B Refrigerant Charge Calculation .......................................................................................... 512.9.3 AUDR-B Refrigerant Charging Procedure ......................................................................................... 51

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TABLE OF CONTENTS ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

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3.0 Operation3.1 Qualified Unit Start-up Report (Required for Warranty) ......................................................... 523.2 Typical Refrigerant Piping ......................................................................................................... 52

3.2A Typical ACDR-B 021S - 035S Packaged Chiller Refrig. Piping .............................................................. 533.2B Typical ACDR-B 030D - 080D Packaged Chiller Refrig. Piping............................................................. 533.2C Typical ACDR-B 085D - 200D Packaged Chiller Refrig. Piping............................................................. 543.2D Typical AUDR-B 021S - 035S Packaged Chiller Refrig. Piping ............................................................. 553.2E Typical AUDR-B 030D - 080D Packaged Chiller Refrig. Piping ............................................................ 553.2F Typical AUDR-B 085D - 200D Packaged Chiller Refrig. Piping ............................................................ 56

3.3 Pre-start-up Procedure for ACDR-B and AUDR-B Systems ........................................................ 573.4 Start-up and Reporting for ACDR-B and AUDR-B Systems ....................................................... 573.5 Lubrication - ACDR-B / AUDR-B ................................................................................................. 58

3.5.1 General ............................................................................................................................................. 583.5.2 Oil Level ............................................................................................................................................ 583.5.3 Oil Type ............................................................................................................................................. 58

3.6 Chilled Fluid Flow Rate ACDR-B or Split-System Chillers ........................................................ 583.6A Unit Cooler Reference Table - DX Coolers .......................................................................................... 583.6B Water Side Pressure Drop Curves - DX Coolers .................................................................................. 59

3.7 System Control ACDR-B and AUDR-B ....................................................................................... 603.7.1 Capacity Control System ................................................................................................................... 603.7.2 Standard Capacity Control Staging ................................................................................................... 613.7.3 "Optional Extra" Capacity Control Staging ......................................................................................... 623.7.4 Condenser Fan Cycling ...................................................................................................................... 63

3.8 Electrical Controls Description ............................................................................................ 64-653.9 DB Director - Microcomputer System Control .........................................................................65

3.9.1 Precautions ......................................................................................................................... 653.9.2 Computer Operation........................................................................................................... 66

3.9.2.1 Keypad Display Quick Reference - Display Status ........................................................... 673.9.2.2 Keypad Display Quick Reference - Entry Keys ................................................................. 683.9.2.3 Display Data ................................................................................................................... 693.9.2.4 Read and Enter Data ...................................................................................................... 703.9.2.5 Capacity Control States .................................................................................................. 713.9.2.6 Circuit Control States ..................................................................................................... 723.9.2.7 Alarms Section .......................................................................................................... 73-743.9.2.8 Control States Quick Reference - Chiller Applications .................................................... 75

3.9.3 Control Functions and Operations ...................................................................................... 763.9.3.1 Compressor and Unloader Staging ................................................................................ 763.9.3.2 Condenser Fan Control .................................................................................................. 773.9.3.3 Pumpdown Control ........................................................................................................ 773.9.3.4 Anti-Recycle ................................................................................................................... 773.9.3.5 Lead / Lag (optional feature) .......................................................................................... 773.9.3.6 Chilled Water / Air Reset ................................................................................................ 773.9.3.7 Customer Control Interlock ............................................................................................ 773.9.3.8 Low Pressure Unload ..................................................................................................... 783.9.3.9 High Pressure Unload ..................................................................................................... 783.9.3.10 High Amp Unload (optional Load Limiting) .................................................................... 783.9.3.11 Low Ambient Temperature Limit (optional) .................................................................... 783.9.3.12 Power-up Delay .............................................................................................................. 783.9.3.13 Electronic Expansion Valve Control (optional) ................................................................ 78

3.9.4 General Servicing Procedure ......................................................................................... 783.9.5ATypical Power Wiring (Two Compressor Model) ........................................................... 793.9.5B Typical Control Wiring (Two Compressor Model) .................................................... 80-81

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TABLE OF CONTENTS ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

3.10 DB Director - Circuit Operation ............................................................................................... 82for ACDRB or AUDRB Split-System Chilleror AUDRB Leaving Air Control with DX Coil ......................................................... 82

3.10.1 Unit on Standby ................................................................................................................ 823.10.2 Unit Run Cycle Sequence - (Increasing Load) .................................................................... 82

3.10.2.1 Step 1 Increasing Load ......................................................................................... 823.10.2.2 Step 2 Increasing Load ......................................................................................... 823.10.2.3 Step 3 Increasing Load ......................................................................................... 823.10.2.4 Step 4 Increasing Load ......................................................................................... 82

3.10.3 Unit Run Cycle Sequence - (Decreasing Load) ................................................................... 833.10.3.1 Step 4 Decreasing Load ........................................................................................ 833.10.3.2 Step 3 Decreasing Load ........................................................................................ 833.10.3.3 Step 2 Decreasing Load ........................................................................................ 833.10.3.1 Step 1 Decreasing Load ........................................................................................ 83

3.11 DB Director - Circuit Operation for AUDRB Return Air Controlof Constant Volume with DX Coil 843.11.1 Unit on Standby ................................................................................................................ 843.11.2 Unit Run Cycle Sequence - (Increasing Load) .................................................................... 84

3.11.2.1 Step 1 Increasing Load ......................................................................................... 843.11.2.2 Step 2 Increasing Load ......................................................................................... 843.11.2.3 Step 3 Increasing Load ......................................................................................... 843.11.2.4 Step 4 Increasing Load ......................................................................................... 84

3.11.3 Unit Run Cycle Sequence - (Decreasing Load) ................................................................... 853.11.3.1 Step 4 Decreasing Load ........................................................................................ 853.11.3.2 Step 3 Decreasing Load ........................................................................................ 853.11.3.3 Step 2 Decreasing Load ........................................................................................ 853.11.3.4 Step 1 Decreasing Load ........................................................................................ 85

3.12 DB Director - Circuit Operationfor AUDRB Suction Pressure Control for multiple evaporators .............................................. 863.12.1 Unit on Standby ................................................................................................................ 863.12.2 Unit Run Cycle Sequence - (Increasing Load) .................................................................... 86

3.12.2.1 Step 1 Increasing Load ......................................................................................... 863.12.2.2 Step 2 Increasing Load ......................................................................................... 863.12.2.3 Step 3 Increasing Load ......................................................................................... 863.12.2.4 Step 4 Increasing Load ......................................................................................... 86

3.12.3 Unit Run Cycle Sequence - (Decreasing Load) ................................................................... 873.12.3.1 Step 4 Decreasing Load ........................................................................................ 873.12.3.2 Step 3 Decreasing Load ........................................................................................ 873.12.3.3 Step 2 Decreasing Load ........................................................................................ 873.12.3.4 Step 1 Decreasing Load ........................................................................................ 87

4.0 Maintenance4.1 General Maintenance ...............................................................................................................884.2 Periodic Inspection ...................................................................................................................884.3 Monthly Inspection ..................................................................................................................884.4 Vessel Maintenance ..................................................................................................................88

4.4.1 General Unit Efficiency and Performance .......................................................................... 884.4.2 Cooler Cleaning................................................................................................................. 88

4.5 Air Cooled Condenser Cleaning ...............................................................................................884.6 Electrical Malfunction .............................................................................................................. 884.7 Compressor Maintenance ....................................................................................................... 894.8 Refrigerant Charge .................................................................................................................. 894.9 Troubleshooting .......................................................................................................................90

4.9.1 Unit will not start .............................................................................................................. 904.9.2 Compressor hums but does not start ................................................................................ 904.9.3 Compressor cycles on low pressure control ...................................................................... 904.9.4 Compressor cycles on high pressure control ..................................................................... 90

4.10 Start-Up and Maintenance Log Sheet .................................................................................91-924.11 Temperature and Pressure Table...............................................................................................93

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○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○1.0 GENERAL INFORMATION

1.1 IntroductionThis manual is designed to provide all necessaryinformation for installation, operation andmaintenance of the latest generation of Dunham-Bushreciprocating compressor package units. Thesepackages include air cooled water chiller machines, andair cooled condensing units.

To use this manual effectively, you must first determineyour unit model number from the unit nameplate.Since this manual is comprehensive for a wide varietyof units, you should be careful to use only thosesections which apply to your model. Note that eachsection is clearly marked as to the applicable models.

The AUDR-B is a condensing unit without a mountedevaporator. It is designed for remote DX water chilleror air cooling coil applications. Due to the evaporatorbeing remotely mounted, the AUDR-B machine is givena factory electrical test only.

1.2 Product Identification

To assure satisfactory operation and to avoid damageto the unit, the installation should be made by aqualified refrigeration mechanic. It is assumed thatthe reader of his manual and those who install, operateand maintain this equipment have a basicunderstanding of the principles of air conditioning,refrigeration and electrical controls. These instructionsare general in nature and are for standard catalog units.Non-standard units may vary in some respects fromthese instructions.

Your Dunham-Bush package has been manufacturedunder a careful quality control system and has beenfactory run tested as a final verification of reliability. Ifit is installed, operated and maintained with care andattention to these instructions, it will give many yearsof satisfactory service.

Air Cooled Packaged Chiller Models and Condensing Units for Use withDX Coil Banks or Remote Coolers for Split-System Chillers

MODEL UNIT SIZE DESCRIPTION021S,024S,027S,030S,035S 1 Compressor - 1 Refrigerant Circuit030D,035D,040D,045D,050D 2 Compressors - 2 Refrigerant Circuits

ACDR-B / AUDR-B 052D,055D,062D,070D,075D,080D 2 Compressors - 2 Refrigerant Circuits085D,090D,100D,102D,112D 4 Compressors - 2 Refrigerant Circuits120D,130D,140D,155D,170D 4 Compressors - 2 Refrigerant Circuits180D,185D,190D,200D 4 Compressors - 2 Refrigerant Circuits

Refrigerant Circuits(S) Single - 021S, 024S, 027S, 030S, 035S(D) Dual - 030D, 035D, 040D, 045D, 050D

052D, 055D, 062D, 070D, 075D080D, 085D, 090D, 100D, 102D112D, 120D, 130D, 140D, 155D170D, 180D, 185D, 190D, 200D

A C D R B 100 D AR Z B

Microcomputer ControlAir Cooled Condenser

R22 Base RefrigerantPackaged Chiller (C)Condensing Unit (U) AK 200/208/3/60 Main Power

AN 230/3/60 Main PowerAR 460/3/60 Main PowerAS 575/3/60 Main Power

Unit Vintage

Nominal Capacity in Tons

Direct Expansion Evaporator

Reciprocating Compressor

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ACDR-B / AUDR-B 021S, 024S, 027S, 030S, 035S

○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○1.0 GENERAL INFORMATION (CONT.)1.3 Physical Specifications: English I.P.

UNIT MODEL 021S 024S 027S 030S 035SCOMPRESSORSQuantity of Compressors (1) 4D25 (1) 4D30 (1) 6D30 (1) 6D35 (1) 6D40STANDARD COOLER for ACDRB orRemote Mounted Cooler (RCH1 Option) CHS007601A CHS007601A CHS007601A CHS007601B CHS008601A

for AUDRB Split-System ChillerWater Volume, Gallons 5.5 5.5 5.5 5.5 7.0Minimum Flow Rate, GPM 37 37 37 50 56

Maximum Flow Rate, GPM 104 104 104 168 172Water Conn. Size In/Out (Type) 3" NPTE 3" NPTE 3" NPTE 3" NPTE 3" NPTEOPTIONAL COOLER for 42° LWT (CH2OPT)(1) for ACDRB or Remote Mounted NR NR NR NR NRCooler (RCH2 Option) with AUDRB forSplit-System ChillerWater Volume, Gallons -- -- -- -- --Minimum Flow Rate, GPM -- -- -- -- --Maximum Flow Rate, GPM -- -- -- -- --

Water Conn. Size In/Out (Type) -- -- -- -- --OPTIONAL COOLER for 40° LWT (CH3OPT)(2) for ACDRB or Remote Mounted NR NR CHS008602A CHS010601A CHS010601ACooler (RCH3 Option) with AUDRB, forSplit-System ChillerWater Volume, Gallons -- -- 7.0 9.4 9.4

Minimum Flow Rate, GPM -- -- 42 62 62Maximum Flow Rate, GPM -- -- 114 205 205Water Conn. Size In/Out (Type) -- -- 4" NPTE 4" NPTE 4" NPTE

CONDENSER L216 L312 L312 L216 L312Fan Quantity - All 30" Diameter 2 2 2 3 3Nominal RPM 1140 1140 1140 1140 1140

Motor Quantity (3) (1) 2 (1) 2 (1) 2 (1) 3 (1) 3HP (4) (1.0) 1.5 (1.0) 1.5 (1.0) 1.5 (1.0) 1.5 (1.0) 1.5GENERALMinimum Starting/Operating Ambient °F(4) 30 30 30 30 30 with HGBP, °F(4) 40 40 40 40 40Low Ambient Option, °F(5) 0 0 0 0 0

Extra Low Ambient Option, °F(6) -20 -20 -20 -20 -20Number of Circuits 1 1 1 1 1Refrigerant Charge, lbs. R-22 50 58 65 72 84

Shipping Weight, lbs. Alum. Fin/Cu. Fin 1712/1942 1852/2201 1929/2278 2259/2604 2328/2672Operating Weight, lbs. Alum. Fin/Cu. Fin 1762/1992 1903/2252 1994/2342 2345/2690 2413/2758

NOTES: (1) CH2 or RCH2 - Oversized cooler required where indicated for 42°F LWT. NR - Not Required(2) CH3 or RCH3 - Oversized cooler required where indicated for 40°F LWT. NPTE - National Pipe Thread External(3) Units with Low Ambient Option use (1) 1.0 HP in lieu of (1) 1.5 HP fan motor per circuit(4) Minimum Starting/Operation Ambient with a maximum of 5 MPH wind across coil.(5) Low Ambient Option requires (1) 1 HP variable fan motor(6) Extra Low Ambient Option requires electronic expansion valve(s), variable speed fan, 50% glycol, 50%

minimum load and maximum 5 MPH wind across coil

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1.0 GENERAL INFORMATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

ACDR-B / AUDR-B 030D, 035D, 040D, 045D, 050D

1.3 Physical Specifications: English I.P.

UNIT MODEL 030D 035D 040D 045D 050DCOMPRESSORS

Quantity of Compressors (2) 4D20 (2) 4D22 (2) 4D25 (1) 4D25 (1) 4D30(1) 6D30 (1) 6D30

STANDARD COOLER for ACDRB orRemote Mounted Cooler (RCH1 Option) CHD008601A CHD008601A CHD010601A CHD010601A CHD011601Bfor AUDRB Split-System ChillerWater Volume, Gallons 7.7 7.7 10.7 10.7 12.9

Minimum Flow Rate, GPM 56 56 62 78 86Maximum Flow Rate, GPM 168 168 205 315 315Water Conn. Size In/Out (Type) 4" NPTE 4" NPTE 4" NPTE 4" NPTE 4" NPTE

OPTIONAL COOLER for 42° LWT (CH2OPT)(1) for ACDRB or Remote Mounted NR CHD010601A NR NR NRCooler (RCH2 Option) with AUDRB forSplit-System ChillerWater Volume, Gallons -- 10.7 -- -- --Minimum Flow Rate, GPM -- 62 -- -- --

Maximum Flow Rate, GPM -- 205 -- -- --Water Conn. Size In/Out (Type) -- 4" NPTE -- -- --OPTIONAL COOLER for 40° LWT (CH3OPT)(2) for ACDRB or Remote Mounted CHD010602A CHD011601A CHD011601A CHD013601A CHD013601ACooler (RCH3 Option) with AUDRB, forSplit-System ChillerWater Volume, Gallons 10.7 12.9 12.9 18.1 18.1

Minimum Flow Rate, GPM 47 69 69 80 80Maximum Flow Rate, GPM 116 206 206 220 220Water Conn. Size In/Out (Type) 4" NPTE 4" NPTE 4" NPTE 4" NPTE 4" NPTE

CONDENSER L216 L216 L216 L216 L216Fan Quantity - All 30" Diameter 4 4 4 4 4Nominal RPM 1140 1140 1140 1140 1140

Motor Quantity (3) (2) 4 (2) 4 (2) 4 (2) 4 (2) 4HP (4) 1.0 1.0 (1.0) 1.5 (1.0) 1.5 (1.0) 1.5GENERALMinimum Starting/Operating Ambient °F(4) 30 30 30 30 30 with HGBP, °F(4) 40 40 40 40 40Low Ambient Option, °F(5) 0 0 0 0 0

Extra Low Ambient Option, °F(6) -20 -20 -20 -20 -20Number of Circuits 2 2 2 2 2Refrigerant Charge, lbs. R-22 72 84 96 108 120

Shipping Weight, lbs. Alum. Fin/Cu. Fin 3567/4019 3677/4129 3691/4143 3914/4366 4010/4462Operating Weight, lbs. Alum. Fin/Cu. Fin 3665/4117 3796/4248 3809/4261 4080/4532 4176/4628

NOTES: (1) CH2 or RCH2 - Oversized cooler required where indicated for 42°F LWT. NR - Not Required(2) CH3 or RCH3 - Oversized cooler required where indicated for 40°F LWT. NPTE - National Pipe Thread External(3) Units with Low Ambient Option use (1) 1.0 HP in lieu of (1) 1.5 HP fan motor per circuit(4) Minimum Starting/Operation Ambient with a maximum of 5 MPH wind across coil.(5) Low Ambient Option requires (2) 1 HP variable fan motors(6) Extra Low Ambient Option requires electronic expansion valve(s), variable speed fan, 50% glycol, 50%

minimum load and maximum 5 MPH wind across coil

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1.0 GENERAL INFORMATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

ACDR-B / AUDR-B 052D, 055D, 062D, 070D, 075D

1.3 Physical Specifications: English I.P.

UNIT MODEL 052D 055D 062D 070D 075DCOMPRESSORS

Quantity of Compressors (2) 6D30 (1) 6D35 (2) 6D35 (2) 6D40 (1) 6D50

(1) 6D30 (1) 8D50STANDARD COOLER for ACDRB orRemote Mounted Cooler (RCH1 Option) CHD011601B CHD011601B CHD012601B CHD012601B CHD013601B

for AUDRB Split-System ChillerWater Volume, Gallons 12.9 12.9 15.4 15.4 18.1Minimum Flow Rate, GPM 86 86 94 94 101

Maximum Flow Rate, GPM 315 315 377 377 420Water Conn. Size In/Out (Type) 4" NPTE 4" NPTE 4" NPTE 4" NPTE 4" NPTEOPTIONAL COOLER for 42° LWT (CH2OPT)(1) for ACDRB or Remote Mounted NR NR NR NR NRCooler (RCH2 Option) with AUDRB forSplit-System ChillerWater Volume, Gallons -- -- -- -- --Minimum Flow Rate, GPM -- -- -- -- --Maximum Flow Rate, GPM -- -- -- -- --

Water Conn. Size In/Out (Type) -- -- -- -- --OPTIONAL COOLER for 40° LWT (CH3OPT)(2) for ACDRB or Remote Mounted CHD013601A CHD013601A EXD16092J11 EXD16092J11 EXD16092J11Cooler (RCH3 Option) with AUDRB, forSplit-System ChillerWater Volume, Gallons 18.1 18.1 36.2 36.2 36.2

Minimum Flow Rate, GPM 80 80 116 116 116Maximum Flow Rate, GPM 220 220 366 366 366Water Conn. Size In/Out (Type) 4" NPTE 4" NPTE 6" VIC 6" VIC 6" VIC

CONDENSER L216 L312 L216 L216 L312Fan Quantity - All 30" Diameter 4 4 6 6 6Nominal RPM 1140 1140 1140 1140 1140

Motor Quantity (3) (2) 4 (2) 4 (2) 4 (2) 4 (2) 6HP (4) (1.0) 1.5 (1.0) 1.5 (1.0) 1.5 (1.0) 1.5 (1.0) 1.5GENERALMinimum Starting/Operating Ambient °F(4) 30 30 30 30 30 with HGBP, °F(4) 40 40 40 40 40Low Ambient Option, °F(5) 0 0 0 0 0

Extra Low Ambient Option, °F(6) -20 -20 -20 -20 -20Number of Circuits 2 2 2 2 2Refrigerant Charge, lbs. R-22 125 132 149 168 180

Shipping Weight, lbs. Alum. Fin/Cu. Fin 4092/4544 4100/4552 5733/6410 5864/6541 6510/7544Operating Weight, lbs. Alum. Fin/Cu. Fin 4258/4710 4266/4718 6065/6742 6196/6873 6842/7876

NOTES: (1) CH2 or RCH2 - Oversized cooler required where indicated for 42°F LWT. NR - Not Required(2) CH3 or RCH3 - Oversized cooler required where indicated for 40°F LWT NPTE - National Pipe Thread External(3) Units with Low Ambient Option use (2) 1.0 HP, balance 1.5 HP per circuit VIC - Victaulic(4) Minimum Starting/Operation Ambient with a maximum of 5 MPH wind across coil(5) Low Ambient Operation requires Variable Speed Fan(6) Extra Low Ambient Option Requires: Electronic Expansion Valve, Variable Speed Fan, 50% Glycol,

50% Minimum Load and Maximum 5 MPH wind across coil

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1.0 GENERAL INFORMATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

ACDR-B / AUDR-B 080D, 085D, 090D, 100D, 102D

1.3 Physical Specifications: English I.P.

UNIT MODEL 080D 085D 090D 100D 102DCOMPRESSORS

Quantity of Compressors (2) 8D50 (2) 4D30 (2) 6D30 (2) 6D30 (4) 6D30(2) 4D25 (2) 4D25 (2) 4D30

STANDARD COOLER for ACDRB orRemote Mounted Cooler (RCH1 Option) CHD013601B EXD12102J07 EXD12102J07 EXD12122J09 EXD12122J09for AUDRB Split-System ChillerWater Volume, Gallons 18.1 26 26 31.1 31.1Minimum Flow Rate, GPM 101 158 158 153 153Maximum Flow Rate, GPM 420 444 444 442 442

Water Conn. Size In/Out (Type) 4" NPTE 4" NPTE 4" NPTE 4" NPTE 4" NPTEOPTIONAL COOLER for 42° LWT(CH2 OPT)(1) for ACDRB or Remote NR NR EXD12122J09 NR NRMounted Cooler (RCH2 Option) withAUDRB for Split-System ChillerWater Volume, Gallons -- -- 31.1 -- --

Minimum Flow Rate, GPM -- -- 153 -- --Maximum Flow Rate, GPM -- -- 442 -- --Water Conn. Size In/Out (Type) -- -- 4" NPTE -- --

OPTIONAL COOLER for 40° LWT (CH3OPT)(2) for ACDRB or Remote Mounted EXD16092J11 EXD14122J11 EXD16122J11 EXD16122J11 EXD16122J11Cooler (RCH3 Option) with AUDRB, forSplit-System ChillerWater Volume, Gallons 36.2 36.2 48.2 48.2 48.2Minimum Flow Rate, GPM 116 140 159 159 159

Maximum Flow Rate, GPM 366 391 443 443 443Water Conn. Size In/Out (Type) 6" VIC 5" VIC 6" VIC 6" VIC 6" VICCONDENSER L312 L216 L216 L216 L216

Fan Quantity - All 30" Diameter 6 8 8 8 8Nominal RPM 1140 1140 1140 1140 1140Motor Quantity (3) (4) 6 (6) 8 (6) 8 (6) 8 (6) 8

HP (4) (1.0) 1.5 (1.0) 1.5 (1.0) 1.5 (1.0) 1.5 (1.0) 1.5GENERALMinimum Starting/Operating Ambient °F(4) 30 30 30 30 30

with HGBP, °F(4) 40 40 40 40 40Low Ambient Option, °F(5) 0 0 0 0 0Extra Low Ambient Option, °F(6) -20 -20 -20 -20 -20

Number of Circuits 2 2 2 2 2Refrigerant Charge, lbs. R-22 192 204 216 240 245Shipping Weight, lbs. Alum. Fin/Cu. Fin 6772/7810 7577/8480 8168/11003 8205/11041 9129/11965

Operating Weight, lbs. Alum. Fin/Cu. Fin 7108/8142 7909/8812 8610/11446 8647/11483 9694/12530

NOTES: (1) CH2 or RCH2 - Oversized cooler required where indicated for 42°F LWT. NR - Not Required(2) CH3 or RCH3 - Oversized cooler required where indicated for 40°F LWT. NPTE - National Pipe Thread External(3) Units with Low Ambient Option use (1) 1.0 HP in lieu of (1) 1.5 HP fan motor per circuit VIC - Victaulic(4) Minimum Starting/Operation Ambient with a maximum of 5 MPH wind across coil.(5) Low Ambient Option requires Variable Speed Fan(6) Extra Low Ambient Option requires electronic expansion valve(s), variable speed fan, 50% glycol, 50%

minimum load and maximum 5 MPH wind across coil

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1.0 GENERAL INFORMATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

ACDR-B / AUDR-B 112D, 120D, 130D, 140D, 155D

1.3 Physical Specifications: English I.P.

UNIT MODEL 112D 120D 130D 140D 155DCOMPRESSORS

Quantity of Compressors (2) 6D35 (4) 6D35 (2) 6D40 (4) 6D40 (2) 6D40(2) 6D30 (2) 6D35 (2) 8D50

STANDARD COOLER for ACDRB orRemote Mounted Cooler (RCH1 Option) EXD12122J09 EXD14122J09 EXD14122J09 EXD14122J09 EXD16122J07for AUDRB Split-System ChillerWater Volume, Gallons 31.1 36.2 36.2 36.2 48.2

Minimum Flow Rate, GPM 153 169 169 169 236Maximum Flow Rate, GPM 442 484 484 484 697Water Conn. Size In/Out (Type) 4" NPTE 5" VIC 5" VIC 5" VIC 6" VIC

OPTIONAL COOLER for 42° LWT (CH2OPT)(1) for ACDRB or Remote Mounted EXD14102J09 NR NR NR NRCooler (RCH2 Option) with AUDRB forSplit System ChillerWater Volume, Gallons 30.3 -- -- -- --Minimum Flow Rate, GPM 140 -- -- -- --

Maximum Flow Rate, GPM 440 -- -- -- --Water Conn. Size In/Out (Type) 5" VIC -- -- -- --OPTIONAL COOLER for 40° LWT (CH3OPT)(2) for ACDRB or Remote Mounted EXD18122J11 EXD18122J09 EXD18122J09 EXD18122J09 EXD20122J09Cooler (RCH3 Option) with AUDRB, forSplit-System ChillerWater Volume, Gallons 61.6 61.6 61.6 61.6 73.8Minimum Flow Rate, GPM 177 213 213 213 237Maximum Flow Rate, GPM 604 740 740 740 800

Water Conn. Size In/Out (Type) 8" VIC 8" VIC 8" VIC 8" VIC 10" VICCONDENSER L216 L216 L312 L216 L312Fan Quantity - All 30" Diameter 10 10 10 12 12

Nominal RPM 1140 1140 1140 1140 1140Motor Quantity(3) (8) 10 (8) 10 (8) 10 (10) 12 (10) 12HP(4) (1.0) 1.5 (1.0) 1.5 (1.0) 1.5 (1.0) 1.5 (1.0) 1.5

GENERALMinimum Starting/Operating Ambient °F(4) 30 30 30 30 30 with HGBP, °F(4) 40 40 40 40 40

Low Ambient Option, °F(5) 0 0 0 0 0Extra Low Ambient Option, °F(6) -20 -20 -20 -20 -20Number of Circuits 2 2 2 2 2

Refrigerant Charge, lbs. R-22 269 288 312 336 372Shipping Weight, lbs. Alum. Fin/Cu. Fin 9666/13210 9687/13231 10457/12179 11220/12574 13032/15100Operating Weight, lbs. Alum. Fin/Cu. Fin 10231/13775 10252/13796 11022/12745 11897/13251 13708/15776

NOTES: (1) CH2 or RCH2 - Oversized cooler required where indicated for 42°F LWT. NR - Not Required(2) CH3 or RCH3 - Oversized cooler required where indicated for 40°F LWT NPTE - National Pipe Thread External(3) Units with Low Ambient Option use (2) 1.0 HP, balance 1.5 HP per circuit VIC - Victaulic(4) Minimum Starting/Operation Ambient with a maximum of 5 MPH wind across coil(5) Low Ambient Operation requires Variable Speed Fan(6) Extra Low Ambient Option Requires: Electronic Expansion Valve, Variable Speed Fan, 50% Glycol,

50% Minimum Load and Maximum 5 MPH wind across coil

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1.0 GENERAL INFORMATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

ACDR-B / AUDR-B 170D, 180D, 185D, 190D, 200D

1.3 Physical Specifications: English I.P.

UNIT MODEL 170D 180D 185D 190D 200DCOMPRESSORS

Quantity of Compressors (4) 8D50 (2) 8D50 (2) 8D50 (4) 8D60 (4) 8D60(2) 8D60 (2) 8D60

STANDARD COOLER for ACDRB orRemote Mounted Cooler (RCH1 Option) EXD18122J07 EXD181221J07 EXD20122J07 EXD18122J07 EXD20122J07for AUDRB Split-System ChillerWater Volume, Gallons 61.6 61.6 73.8 61.6 73.8

Minimum Flow Rate, GPM 267 267 298 267 298Maximum Flow Rate, GPM 1060 1060 816 1060 816Water Conn. Size In/Out (Type) 8" VIC 8" VIC 10" VIC 8" VIC 10" VIC

OPTIONAL COOLER for 42° LWT (CH2OPT)(1) for ACDRB or Remote Mounted NR NR NR NR NRCooler (RCH2 Option) with AUDRB forSplit-System ChillerWater Volume, Gallons -- -- -- -- --Minimum Flow Rate, GPM -- -- -- -- --

Maximum Flow Rate, GPM -- -- -- -- --Water Conn. Size In/Out (Type) -- -- -- -- --OPTIONAL COOLER for 40° LWT (CH3OPT)(2) for ACDRB or Remote Mounted EXD20122J09 EXD20122J07 NR EXD20122J07 NRCooler (RCH3 Option) with AUDRB, forSplit-System ChillerWater Volume, Gallons 73.8 73.8 -- 73.8 --

Minimum Flow Rate, GPM 237 298 -- 298 --Maximum Flow Rate, GPM 800 816 -- 816 --Water Conn. Size In/Out (Type) 10" VIC 10" VIC -- 10" VIC --

CONDENSER L312 L312 L312 L312 L312Fan Quantity - All 30" Diameter 12 14 14 14 14Nominal RPM 1140 1140 1140 1140 1140

Motor Quantity (3) (10) 12 (12) 14 (12) 14 (12) 14 (12) 14HP (4) 1.0) 1.5 (1.0) 1.5 (1.0) 1.5 (1.0) 1.5 (1.0) 1.5GENERALMinimum Starting/Operating Ambient °F(4) 30 30 30 30 30 with HGBP, °F(4) 40 40 40 40 40Low Ambient Option, °F(5) 0 0 0 0 0

Extra Low Ambient Option, °F(6) -20 -20 -20 -20 -20Number of Circuits 2 2 2 2 2Refrigerant Charge, lbs. R-22 408 432 444 456 480

Shipping Weight, lbs. Alum. Fin/Cu. Fin 13071/15139 13770/16182 13783/16195 13796/16209 13823/16235Operating Weight, lbs. Alum. Fin/Cu. Fin 13748/15816 14446/16859 14460/16872 14473/16885 14499/16911

NOTES: (1) CH2 or RCH2 - Oversized cooler required where indicated for 42°F LWT. NR - Not Required(2) CH3 or RCH3 - Oversized cooler required where indicated for 40°F LWT. NPTE - National Pipe Thread External(3) Units with Low Ambient Option use (1) 1.0 HP in lieu of (1) 1.5 HP fan motor per circuit VIC - Victaulic(4) Minimum Starting/Operation Ambient with a maximum of 5 MPH wind across coil.(5) Low Ambient Option requires Variable Speed Fan(6) Extra Low Ambient Option requires electronic expansion valve(s), variable speed fan, 50% glycol, 50%

minimum load and maximum 5 MPH wind across coil

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ACDR-B / AUDR-B 021S, 024S, 027S, 030S, 035S

○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○1.0 GENERAL INFORMATION (CONT.)1.4 Physical Specifications: S.I. Units

UNIT MODEL 021S 024S 027S 030S 035SCOMPRESSORSQuantity of Compressors (1) 4D25 (1) 4D30 (1) 6D30 (1) 6D35 (1) 6D40STANDARD COOLER for ACDRB orRemote Mounted Cooler (RCH1 Option) CHS007601A CHS007601A CHS007601A CHS007601B CHS008601A

for AUDRB Split-System ChillerNominal kWo 74 84 95 105 123Water Volume, Liters 21 21 21 21 26.6

Minimum Flow Rate, Liters/sec 2.34 2.34 2.34 3.16 3.54Maximum Flow Rate, Liters/sec 6.39 6.39 6.39 10.38 10.63Water Conn. Size In/Out (MM) (Type) 76.2 NPTE 76.2 NPTE 76.2 NPTE 76.2 NPTE 76.2 NPTE

OPTIONAL COOLER for 5.5°C LWT (CH2OPT)(1) for ACDRB or Remote Mounted NR NR NR NR NRCooler (RCH2 Option) with AUDRB, forSplit-System ChillerWater Volume, Liters -- -- -- -- --Minimum Flow Rate, Liters/sec. -- -- -- -- --

Maximum Flow Rate, Liters/sec. -- -- -- -- --Water Conn. Size In/Out (MM) (Type) -- -- -- -- --OPTIONAL COOLER for 4.5°C LWT (CH3OPT)(2) for ACDRB or Remote Mounted NR NR CHS008602A CHS010601A CHS010601ACooler (RCH3 Option) with AUDRB, forSplit-System ChillerWater Volume, Liters -- -- 26.6 35.7 35.7Minimum Flow Rate, Liters/sec. -- -- 2.66 3.92 3.92Maximum Flow Rate, Liters/sec. -- -- 7.21 12.97 12.97

Water Conn. Size In/Out (MM) (Type) -- -- 101.6 NPTE 101.6 NPTE 101.6 NPTECONDENSER L216 L312 L312 L216 L312Fan Quantity - All 760 mm Diameter 2 2 2 3 3

Nominal RPM 1140 1140 1140 1140 1140Motor Quantity(3) (1) 2 (1) 2 (1) 2 (1) 3 (1) 3kW(4) (.76) 1.15 (.76) 1.15 (.76) 1.15 (.76) 1.15 (.76) 1.15

GENERALMinimum Starting/Operating Ambient °C(4) -1.1 -1.1 -1.1 -1.1 -1.1 with HGBP °C(4) 4.4 4.4 4.4 4.4 4.4

Low Ambient Option °C(5) -18 -18 -18 -18 -18Extra Low Ambient Option °C(6) -29 -29 -29 -29 -29Number of Circuits 1 1 1 1 1

Refrigerant Charge, kgs R-22 22 27 30 33 38Shipping Weight, kgs Alum. Fin/Cu. Fin 777/881 840/998 875/1033 1025/1181 1056/1212Operating Weight, kgs Alum. Fin/Cu. Fin 799/904 863/1022 904/1063 1064/1220 1095/1251

NOTES: (1) CH2 or RCH2 - Oversized cooler required where indicated for 5.5°C LWT NR - Not Required(2) CH3 or RCH3- Oversized cooler required where indicated for 4.5°C LWT NPTE - National Pipe Thread External(3) Units with Low Ambient Option use (1) .76 kW in lieu of (1) 1.15 kW fan motor per circuit(4) Minimum Starting/Operation Ambient with a maximum of 8 km/hr wind across coil(5) Low Ambient Option requires (1) .76 kW Variable Speed Fan Motor per circuit(6) Extra Low Ambient Option requires Electronic Expansion Valve, not available on model ACDRB021S, Variable

Speed Fan, 50% Glycol, 50% minimum load and maximum 8km/hr wind across coil.

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ACDR-B / AUDR-B 030D, 035D, 040D, 045D, 050D

○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○1.0 GENERAL INFORMATION (CONT.)1.4 Physical Specifications: S.I. Units

UNIT MODEL 030D 035D 040D 045D 050DCOMPRESSORS

Quantity of Compressors (2) 4D20 (2) 4D22 (2) 4D25 (1) 4D25 (1) 4D30(1) 6D30 (1) 6D30

STANDARD COOLER for ACDRB orRemote Mounted Cooler (RCH1 option) CHD008601A CHD008601A CHD010601A CHD010601B CHD011601Bfor AUDRB Split System ChillerNominal kWo 105 123 141 158 176Water Volume, Liters 29.2 29.2 40.5 40.5 49Minimum Flow Rate, Liters/sec 3.54 3.54 3.92 4.93 5.44

Maximum Flow Rate, Liters/sec 10.63 10.63 12.97 19.23 19.23Water Conn. Size In/Out (MM) (Type) 101.6 NPTE 101.6 NPTE 101.6 NPTE 101.6 NPTE 101.6 NPTEOPTIONAL COOLER for 5.5°C LWT (CH2OPT)(1) for ACDRB or Remote Mounted NR CHD010601B NR NR NRCooler (RCH2 Option) with AUDRB, forSplit System ChillerWater Volume, Liters -- 40.5 -- -- --Minimum Flow Rate, Liters/sec. -- 5.44 -- -- --Maximum Flow Rate, Liters/sec. -- 19.23 -- -- --

Water Conn. Size In/Out (MM) (Type) -- 101.6 NPTE -- -- --OPTIONAL COOLER for 4.5°C LWT(CH3 OPT)(2) for ACDRB or Remote CHD010602A CHD011601A CHD011601A CHD013601A CHD013601AMounted Cooler (RCH3 Option) withAUDRB, for Split System ChillerWater Volume, Liters 40.5 49 49 68.5 68.5

Minimum Flow Rate, Liters/sec. 2.97 4.36 4.36 5.06 5.06Maximum Flow Rate, Liters/sec. 7.34 13.03 13.03 13.91 13.91Water Conn. Size In/Out (MM) (Type) 101.6 NPTE 101.6 NPTE 101.6 NPTE 101.6 NPTE 101.6 NPTE

CONDENSER L216 L216 L216 L216 L216Fan Quantity - All 760 mm Diameter 4 4 4 4 4Nominal RPM 1140 1140 1140 1140 1140

Motor Quantity(3) (2) 4 (2) 4 (2) 4 (2) 4 (2) 4kW(4) (.76) 1.15 (.76) 1.15 (.76) 1.15 (.76) 1.15 (.76) 1.15GENERAL

Minimum Starting/Operating Ambient °C(4) -1.1 -1.1 -1.1 -1.1 -1.1 with HGBP °C(4) 4.4 4.4 4.4 4.4 4.4Low Ambient Option °C(5) -18 -18 -18 -18 -18

Extra Low Ambient Option °C(6) -29 -29 -29 -29 -29Number of Circuits 2 2 2 2 2Refrigerant Charge, kgs R-22 33 38 44 49 55

Shipping Weight, kgs Alum. Fin/Cu. Fin 1618/1823 1668/1873 1674/1879 1775/1980 1819/2024Operating Weight, kgs Alum. Fin/Cu. Fin 1662/1867 1722/1927 1728/1933 1851/2056 1894/2099

NOTES: (1) CH2 or RCH2 - Oversized cooler required where indicated for 5.5°C LWT NR - Not Required(2) CH3 or RCH3- Oversized cooler required where indicated for 4.5°C LWT NPTE - National Pipe Thread External(3) Units with Low Ambient Option use (1) .76 kW in lieu of (1) 1.15 kW fan motor per circuit(4) Minimum Starting/Operation Ambient with a maximum of 8 km/hr wind across coil(5) Low Ambient Option requires (1) .76 kW Variable Speed Fan Motor per circuit(6) Extra Low Ambient Option requires Electronic Expansion Valve, not available on model ACDRB021S, Variable

Speed Fan, 50% Glycol, 50% minimum load and maximum 8km/hr wind across coil.

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ACDR-B / AUDR-B 052D, 055D, 062D, 070D, 075D

○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○1.0 GENERAL INFORMATION (CONT.)1.4 Physical Specifications: S.I. Units

UNIT MODEL 052D 055D 062D 070D 075DCOMPRESSORS

Quantity of Compressors (2) 6D30 (1) 6D35 (2) 6D35 (2) 6D40 (1) 6D40(1) 6D30 (1) 8D50

STANDARD COOLER for ACDRB orRemote Mounted Cooler (RCH1 option) CHD011601B CHD011601B CHD012601B CHD012601B CHD013601Bfor AUDRB Split System ChillerNominal kWo 183 193 218 246 264Water Volume, Liters 49 49 58.3 58.3 68.5Minimum Flow Rate, Liters/sec 5.44 5.44 5.95 5.95 6.39

Maximum Flow Rate, Liters/sec 19.23 19.23 23.22 23.22 25.75Water Conn. Size In/Out (MM) (Type) 101.6 NPTE 101.6 NPTE 101.6 NPTE 101.6 NPTE 101.6 NPTEOPTIONAL COOLER for 5.5°C LWT (CH2OPT)(1) for ACDRB or Remote Mounted NR NR NR NR NRCooler (RCH2 Option) with AUDRB, forSplit System ChillerWater Volume, Liters -- -- -- -- --Minimum Flow Rate, Liters/sec. -- -- -- -- --Maximum Flow Rate, Liters/sec. -- -- -- -- --

Water Conn. Size In/Out (MM) (Type) -- -- -- -- --OPTIONAL COOLER for 4.5°C LWT(CH3 OPT)(2) for ACDRB or Remote CHD013601A CHD013601A EXD16092J11 EXD16092J11 EXD16092J11Mounted Cooler (RCH3 Option) withAUDRB, for Split System ChillerWater Volume, Liters 68.5 68.5 137 137 137

Minimum Flow Rate, Liters/sec. 5.06 5.06 7.34 7.34 7.34Maximum Flow Rate, Liters/sec. 13.92 13.92 23.16 23.16 23.16Water Conn. Size In/Out (MM) (Type) 101.6 NPTE 101.6 NPTE 152.4 VIC 152.4 VIC 152.4 VIC

CONDENSER L216 L216 L216 L216 L216Fan Quantity - All 760 mm Diameter 4 4 6 6 6Nominal RPM 1140 1140 1140 1140 1140

Motor Quantity(3) (2) 4 (2) 4 (2) 6 (2) 6 (2) 6kW(4) (.76) 1.15 (.76) 1.15 (.76) 1.15 (.76) 1.15 (.76) 1.15GENERAL

Minimum Starting/Operating Ambient °C(4) -1.1 -1.1 -1.1 -1.1 -1.1 with HGBP °C(4) 4.4 4.4 4.4 4.4 4.4Low Ambient Option °C(5) -18 -18 -18 -18 -18

Extra Low Ambient Option °C(6) -29 -29 -29 -29 -29Number of Circuits 2 2 2 2 2Refrigerant Charge, kgs R-22 57 60 68 76 82

Shipping Weight, kgs Alum. Fin/Cu. Fin 1856/2061 1860/2065 2600/2908 2660/2967 2953/3422Operating Weight, kgs Alum. Fin/Cu. Fin 1931/2136 1935/2140 2751/3058 2811/3118 3104/3573

NOTES: (1) CH2 or RCH2 - Oversized cooler required where indicated for 5.5°C LWT NR - Not Required(2) CH3 or RCH3- Oversized cooler required where indicated for 4.5°C LWT NPTE - National Pipe Thread External(3) Units with Low Ambient Option use (1) .76 kW in lieu of (1) 1.15 kW fan motor per circuit VIC - Victaulic(4) Minimum Starting/Operation Ambient with a maximum of 8 km/hr wind across coil(5) Low Ambient Option requires (1) .76 kW Variable Speed Fan Motor per circuit(6) Extra Low Ambient Option requires Electronic Expansion Valve, not available on model ACDRB021S, Variable

Speed Fan, 50% Glycol, 50% minimum load and maximum 8km/hr wind across coil.

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ACDR-B / AUDR-B 080D, 085D, 090D, 100D, 102D

○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○1.0 GENERAL INFORMATION (CONT.)1.4 Physical Specifications: S.I. Units

UNIT MODEL 080D 085D 090D 100D 102DCOMPRESSORS

Quantity of Compressors (2) 8D50 (2) 4D30 (2) 6D30 (2) 6D30 (4) 6D30(2) 4D25 (2) 4D25 (2) 4D30

STANDARD COOLER for ACDRB orRemote Mounted Cooler (RCH1 option) CHD013601B EXD12102J07 EXD12102J07 EXD12122J09 EXD12122J09for AUDRB Split System ChillerNominal kWo 281 299 316 352 359Water Volume, Liters 68.5 98.2 98.2 117.5 117.5Minimum Flow Rate, Liters/sec 6.39 10.0 10.0 9.68 9.68

Maximum Flow Rate, Liters/sec 25.75 28.1 28.1 27.96 27.96Water Conn. Size In/Out (MM) (Type) 101.6 NPTE 101.6 NPTE 101.6 NPTE 101.6 NPTE 101.6 NPTEOPTIONAL COOLER for 5.5°C LWT (CH2OPT)(1) for ACDRB or Remote Mounted NR NR EXD12122J09 NR NRCooler (RCH2 Option) with AUDRB, forSplit System ChillerWater Volume, Liters -- -- 117.5 -- --Minimum Flow Rate, Liters/sec. -- -- 9.68 -- --Maximum Flow Rate, Liters/sec. -- -- 27.96 -- --

Water Conn. Size In/Out (MM) (Type) -- -- 4” NPTE -- --OPTIONAL COOLER for 4.5°C LWT(CH3 OPT)(2) for ACDRB or Remote EXD16092J11 EXD14122J11 EXD16122J11 EXD16122J11 EXD16122J11Mounted Cooler (RCH3 Option) withAUDRB, for Split System ChillerWater Volume, Liters 137 137 182.3 182.3 182.3

Minimum Flow Rate, Liters/sec. 7.34 8.86 10.06 10.06 10.06Maximum Flow Rate, Liters/sec. 23.16 24.74 28.03 28.03 28.03Water Conn. Size In/Out (MM) (Type) 152.4 VIC 152.4 VIC 152.4 VIC 152.4 VIC 152.4 VIC

CONDENSER L312 L216 L216 L216 L216Fan Quantity - All 760 mm Diameter 6 8 8 8 8Nominal RPM 1140 1140 1140 1140 1140

Motor Quantity(3) (2) 6 (2) 8 (2) 8 (2) 8 (2) 8kW(4) (.76) 1.15 (.76) 1.15 (.76) 1.15 (.76) 1.15 (.76) 1.15GENERAL

Minimum Starting/Operating Ambient °C(4) -1.1 -1.1 -1.1 -1.1 -1.1 with HGBP °C(4) 4.4 4.4 4.4 4.4 4.4Low Ambient Option °C(5) -18 -18 -18 -18 -18

Extra Low Ambient Option °C(6) -29 -29 -29 -29 -29Number of Circuits 2 2 2 2 2Refrigerant Charge, kgs R-22 87 93 98 109 112

Shipping Weight, kgs Alum. Fin/Cu. Fin 3074/3543 3437/3847 3705/4991 3722/5008 4141/5427Operating Weight, kgs Alum. Fin/Cu. Fin 3224/3693 3588/3997 3905/5192 3922/5209 4397/5684

NOTES: (1) CH2 or RCH2 - Oversized cooler required where indicated for 5.5°C LWT NR - Not Required(2) CH3 or RCH3- Oversized cooler required where indicated for 4.5°C LWT NPTE - National Pipe Thread External(3) Units with Low Ambient Option use (1) .76 kW in lieu of (1) 1.15 kW fan motor per circuit VIC - Victaulic(4) Minimum Starting/Operation Ambient with a maximum of 8 km/hr wind across coil(5) Low Ambient Option requires (1) .76 kW Variable Speed Fan Motor per circuit(6) Extra Low Ambient Option requires Electronic Expansion Valve, not available on model ACDRB021S, Variable

Speed Fan, 50% Glycol, 50% minimum load and maximum 8km/hr wind across coil.

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ACDR-B / AUDR-B 112D, 120D, 130D, 140D, 155D

○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○1.0 GENERAL INFORMATION (CONT.)1.4 Physical Specifications: S.I. Units

UNIT MODEL 112D 120D 130D 140D 155DCOMPRESSORS

Quantity of Compressors (2) 6D35 (4) 6D35 (2) 6D40 (4) 6D40 (2) 6D40(2) 6D30 (2) 6D35 (2) 6D50

STANDARD COOLER for ACDRB orRemote Mounted Cooler (RCH1 option) EXD12122J09 EXD14122J09 EXD14122J09 EXD14122J09 EXD16122J07for AUDRB Split System ChillerNominal kWo 394 422 457 492 545Water Volume, Liters 117.5 137 137 137 182.3Minimum Flow Rate, Liters/sec 9.68 10.69 10.69 10.69 14.93

Maximum Flow Rate, Liters/sec 27.96 30.62 30.62 30.62 44.10Water Conn. Size In/Out (MM) (Type) 101.6 NPTE 127 VIC 127 VIC 127 VIC 152.4 VICOPTIONAL COOLER for 5.5°C LWT (CH2OPT)(1) for ACDRB or Remote Mounted EXD14102J09 NR NR NR NRCooler (RCH2 Option) with AUDRB, forSplit System ChillerWater Volume, Liters 114.7 -- -- -- --Minimum Flow Rate, Liters/sec. 8.86 -- -- -- --Maximum Flow Rate, Liters/sec. 27.84 -- -- -- --

Water Conn. Size In/Out (MM) (Type) 127 VIC -- -- -- --OPTIONAL COOLER for 4.5°C LWT(CH3 OPT)(2) for ACDRB or Remote EXD18122J11 EXD18122J09 EXD18122J09 EXD18122J09 EXD20122J09Mounted Cooler (RCH3 Option) withAUDRB, for Split System ChillerWater Volume, Liters 233.3 233.3 233.3 233.3 269.5Minimum Flow Rate, Liters/sec. 11.20 13.48 13.48 13.48 15.00

Maximum Flow Rate, Liters/sec. 38.22 46.82 46.82 46.82 50.62Water Conn. Size In/Out (MM) (Type) 203.2 VIC 203.2 VIC 203.2 VIC 203.2 VIC 254 VICCONDENSER L216 L216 L312 L216 L312

Fan Quantity - All 760 mm Diameter 10 10 10 12 12Nominal RPM 1140 1140 1140 1140 1140Motor Quantity(3) (2) 6 (2) 10 (2) 10 (2) 10 (2) 10

kW(4) (.76) 1.15 (.76) 1.15 (.76) 1.15 (.76) 1.15 (.76) 1.15GENERALMinimum Starting/Operating Ambient °C(4) -1.1 -1.1 -1.1 -1.1 -1.1

with HGBP °C(4) 4.4 4.4 4.4 4.4 4.4Low Ambient Option °C(5) -18 -18 -18 -18 -18Extra Low Ambient Option °C(6) -29 -29 -29 -29 -29

Number of Circuits 2 2 2 2 2Refrigerant Charge, kgs R-22 122 131 142 153 169Shipping Weight, kgs Alum. Fin/Cu. Fin 4384/5992 4394/6002 4743/5524 5089/5704 5911/6849

Operating Weight, kgs Alum. Fin/Cu. Fin 4641/6248 4650/6258 5000/5781 5396/6011 6218/7156

NOTES: (1) CH2 or RCH2 - Oversized cooler required where indicated for 5.5°C LWT NR - Not Required(2) CH3 or RCH3- Oversized cooler required where indicated for 4.5°C LWT NPTE - National Pipe Thread External(3) Units with Low Ambient Option use (1) .76 kW in lieu of (1) 1.15 kW fan motor per circuit VIC - Victaulic(4) Minimum Starting/Operation Ambient with a maximum of 8 km/hr wind across coil(5) Low Ambient Option requires (1) .76 kW Variable Speed Fan Motor per circuit(6) Extra Low Ambient Option requires Electronic Expansion Valve, not available on model ACDRB021S, Variable

Speed Fan, 50% Glycol, 50% minimum load and maximum 8km/hr wind across coil.

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ACDR-B / AUDR-B 170D, 180D, 185D, 190D, 200D

○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○1.0 GENERAL INFORMATION (CONT.)1.4 Physical Specifications: S.I. Units

UNIT MODEL 170D 180D 185D 190D 200DCOMPRESSORS

Quantity of Compressors (4) 8D50 (2) 8D50 (2) 8D50 (4) 8D60 (4) 8D60(2) 8D60 (2) 8D60

STANDARD COOLER for ACDRB orRemote Mounted Cooler (RCH1 option) EXD18122J07 EXD18122J07 EXD20122J07 EXD18122J07 EXD20122J07for AUDRB Split System ChillerNominal kWo 598 633 650 668 703Water Volume, Liters 233.3 233.3 279.5 233.3 279.5Minimum Flow Rate, Liters/sec 16.89 16.89 18.85 16.89 18.85

Maximum Flow Rate, Liters/sec 67.07 67.07 51.63 67.07 51.63Water Conn. Size In/Out (MM) (Type) 203.2 VIC 203.2 VIC 254 VIC 203.2 VIC 254 VICOPTIONAL COOLER for 5.5°C LWT (CH2OPT)(1) for ACDRB or Remote Mounted NR NR NR NR NRCooler (RCH2 Option) with AUDRB, forSplit System ChillerWater Volume, Liters -- -- -- -- --Minimum Flow Rate, Liters/sec. -- -- -- -- --Maximum Flow Rate, Liters/sec. -- -- -- -- --

Water Conn. Size In/Out (MM) (Type) -- -- -- -- --OPTIONAL COOLER for 4.5°C LWT(CH3 OPT)(2) for ACDRB or Remote EXD20122J09 EXD20122J07 NR EXD20122J07 NRMounted Cooler (RCH3 Option) withAUDRB, for Split System ChillerWater Volume, Liters 279.5 279.5 -- 279.5 --

Minimum Flow Rate, Liters/sec. 14.10 18.85 -- 18.85 --Maximum Flow Rate, Liters/sec. 50.62 51.63 -- 51.63 --Water Conn. Size In/Out (MM) (Type) 254 VIC 254 VIC -- 254 VIC --

CONDENSER L312 L312 L312 L312 L312Fan Quantity - All 760 mm Diameter 12 14 14 14 14Nominal RPM 1140 1140 1140 1140 1140

Motor Quantity(3) (2) 12 (2) 14 (2) 14 (2) 14 (2) 14kW(4) (.76) 1.15 (.76) 1.15 (.76) 1.15 (.76) 1.15 (.76) 1.15GENERAL

Minimum Starting/Operating Ambient °C(4) -1.1 -1.1 -1.1 -1.1 -1.1 with HGBP °C(4) 4.4 4.4 4.4 4.4 4.4Low Ambient Option °C(5) -18 -18 -18 -18 -18

Extra Low Ambient Option °C(6) -29 -29 -29 -29 -29Number of Circuits 2 2 2 2 2Refrigerant Charge, kgs R-22 185 196 202 207 218

Shipping Weight, kgs Alum. Fin/Cu. Fin 5929/6867 6246/7340 6252/7356 6258/7352 6270/7364Operating Weight, kgs Alum. Fin/Cu. Fin 6236/7174 6553/7647 6559/7653 6565/7659 6577/7671

NOTES: (1) CH2 or RCH2 - Oversized cooler required where indicated for 5.5°C LWT NR - Not Required(2) CH3 or RCH3- Oversized cooler required where indicated for 4.5°C LWT NPTE - National Pipe Thread External(3) Units with Low Ambient Option use (1) .76 kW in lieu of (1) 1.15 kW fan motor per circuit VIC - Victaulic(4) Minimum Starting/Operation Ambient with a maximum of 8 km/hr wind across coil(5) Low Ambient Option requires (1) .76 kW Variable Speed Fan Motor per circuit(6) Extra Low Ambient Option requires Electronic Expansion Valve, not available on model ACDRB021S, Variable

Speed Fan, 50% Glycol, 50% minimum load and maximum 8km/hr wind across coil.

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2.0 INSTALLATION ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

2.1 General ACDR-B/AUDR-BModels ACDR-B packaged chillers are designed to coolwater or other non-corrosive liquids. Water is circulatedthrough the direct expansion cooler where it is cooledto the desired temperature then circulated to coolingcoils for air conditioning, or to other types of heatexchangers for process cooling.

AUDR-B Model condensing units are designed to servea wide variety of field-installed evaporators, withinterconnecting piping to be connected in the field.When connected to a direct expansion cooler, the modelAUDR-B condensing unit operates the same as an ACDR-B packaged chiller. When connected to one or moreDX coil banks, the unit is used to cool and dehumidifyducted air.

Care should be taken to see that the equipment isproperly installed and adjusted. An installer or operatorshould first become familiar with the informationcontained in this manual. Installation of models AUDR-B requiring field-installed refrigeration piping shouldonly be made by a qualified refrigeration technician.

2.2 Inspection ACDR-B/AUDR-BWhen the equipment is delivered, it is important thatthe following inspection be completed in the presenceof the carrier’s representative:

1. Check all crates and cartons received against the Billof Lading/Shipping Papers to be sure they agree.

2. Check the model number and the electricalcharacteristics on the nameplate to determine if theyare correct.

3. Check for freight damage, shortages or otherdiscrepancies and note them on the delivery receiptbefore signing.

In the event that any damage is found, a damage claimshould immediately be filed by the purchaser againstthe delivering carrier as all shipments are made at thepurchaser’s risk.

2.3 Handling Storage & Rigging

2.3.1 General ACDR-B/AUDR-B HandlingInstructions

Each unit has been carefully tested at the factory whereevery precaution is taken to assure that the unit reachesyou in perfectcondition. It is very important that theriggers and movers should use the same care andprecaution in moving the equipment into place. Makesure that chains, cables, or other moving equipmentare placed so as to avoid damage to the unit or piping.The refrigerant piping must not be used as a ladder oras a hand hold. Do not attach a chain hoist sling to thepiping or equipment. Move the unit in an uprightposition and let it down gently from trucks or rollers.

2.3.2 StorageThis equipment is designed for outdoor use but mustbe protected from physical damage if stored beforeinstallation.

2.3.3 ACDR-B/AUDR-B Rigging andMoving

This equipment is too large to be carried by a forkliftwithout serious damage so rigging is required.

Figure 2.3.3.1

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2.0 INSTALLATION ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

2.4 Space and ClearanceRequirementsACDR-B/AUDR-B

2.4.1 General Space and ClearanceRequirements

The dimensional data and space requirements are givenon pages 20 thru 28. Refer to 2.4.2 for location andinstallation clearances and 2.4.3 for dimensionalrequirements. The most important consideration whichmust be taken into account when deciding upon thelocation of air cooled equipment, is the provision for asupply of ambient air to the condenser, and removal ofheated air from the condenser area. Where this essentialrequirement is not provided, it will result in highercondensing temperatures, which cause poor operation,higher power consumption and possibly, eventualfailure of equipment. Units must not be located in thevicinity of steam, hot air or fume exhausts.

Another consideration which must be taken is that theunit should be mounted away from noise sensitivespaces and must have adequate support to avoidvibration and noise transmission into the building. Unitsshould be mounted over corridors, utility areas, restrooms or other auxiliary areas where sound levels arenot as important a factor. Sound and structuralconsultants should be retained for recommendationson critical installations.

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2.4.2 Location and Installation Clearance - ACDRB021S-200D & AUDRB021S-200D

2.0 INSTALLATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

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2.0 INSTALLATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

2.4.3 Dimensional Data: ACDRB021S to 027SAUDRB021S to 027S Same as Chiller - Less Cooler

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2.0 INSTALLATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

2.4.3 Dimensional Data: ACDRB030S to 035SAUDRB030S to 035S Same as Chiller - Less Cooler

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2.0 INSTALLATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

2.4.3 Dimensional Data: ACDRB030D to 055DAUDRB030D to 055D Same as Chiller - Less Cooler

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2.0 INSTALLATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

2.4.3 Dimensional Data: ACDRB062D to 080DAUDRB062D to 080D Same as Chiller - Less Cooler

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2.0 INSTALLATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

2.4.3 Dimensional Data: ACDRB085D to 102DAUDRB085D to 102D Same as Chiller - Less Cooler

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2.0 INSTALLATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

2.4.3 Dimensional Data: ACDRB112D to 130DAUDRB112D to 130D Same as Chiller - Less Cooler

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2.0 INSTALLATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

2.4.3 Dimensional Data: ACDRB140D to 170DAUDRB140D to 170D Same as Chiller - Less Cooler

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2.0 INSTALLATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

2.4.3 Dimensional Data: ACDRB180D to 200DAUDRB180D to 200D Same as Chiller - Less Cooler

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2.0 INSTALLATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

2.5 Foundation or Mounting StructureFoundations must be level within 1/16" per foot, for properoperation and functioning of controls. Provision must bemade for supporting the individual load points as shown inthe unit dimensions on 2.4.3 and unit weight and point

loading charts 2.5.1 - 2.5.4. Roof mounted units must besupported on adequate steel structures. If units are locatedon the ground level, a concrete base is recommended.

2.5.1 ACDR-B Unit Weights and Point LoadingAluminum Fin Condenser Unit

Drawing No. 021741

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2.5.4 AUDR-B Unit Weights and Point LoadingCopper Fin Condenser Unit

Drawing No. 021834

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2.6 Vibration Isolation ACDR-B/AUDR-B

2.6.1 ACDR-B Rubber-in-Shear Vibration Isolators and LocationsFor Units with Aluminum Fin Condensers

Under certain critical conditions, it may be necessary to installvibration isolators under the base of the Packaged Chillerand the Air Cooled Condenser.

Rubber-in-shear or spring vibration isolators are offered asoptional items. See 2.6.1 or 2.6.2 on pages 21-22 (ACDR-B /AUDR-B) for mounting location. When spring isolators areused, flexible connectors must be installed in the water pipingsystem and in the refrigerant lines of split systems. Note:These flexible connectors must be suitable for the fluid andpressures involves.

When using flexible connectors in refrigerant piping, theymust be mounted in the refrigerant discharge and liquid lines

close to the packaged chiller, in a horizontal position andparallel to the compressor crankshaft.

All piping which is external to the packaged chiller must besupported by spring mounted hangers and any piping whichgoes through the wall, ceiling or floor should be properlysheathed to prevent transmission of piping vibration to thestructure.

When spring isolators are used, electrical service to the unitmust also be flexibly connected, by means of a 36" section offlexible conduit.

Drawing No. 021781

Page 34: 01/00 6107 ACDR-B/AUDR-B Reciprocating … TABLE OF CONTENTS aaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaa 3.10 DB Director - Circuit Operation ... 82 for ACDRB or AUDRB Split-System

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2.6.2 ACDR-B Rubber-in-Shear Vibration Isolators and LocationsFor Units with Copper Fin Condensers

Drawing No. 021782

Page 35: 01/00 6107 ACDR-B/AUDR-B Reciprocating … TABLE OF CONTENTS aaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaa 3.10 DB Director - Circuit Operation ... 82 for ACDRB or AUDRB Split-System

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2.0 INSTALLATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

2.6.8 AUDR-B Spring Vibration Isolators and LocationsFor Units with Copper Fin Condensers

Drawing No. 021911

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41

2.0 INSTALLATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

2.7.1 ACDR-B Chilled Water PipingAfter the unit has been leveled, the external water pipingmay be made up. Be sure water piping is connected tothe correct fittings. The water out connection is closestto the expansion valve (Refrigerant-in) end. A chilledwater flow switch must be installed.

Water flow through the cooler must remain constantfor proper chiller operation. Water pressure gaugesare recommended to check the water pressure and flowrate in the system, before and after the cooler, and todetermine if variations occur in the cooler and system.

The cooler must be freeze protected with the correctpercentage of glycol if ambient temperatures areexpected to be below 32°F. If sub-freezing ambienttemperatures are possible, all exposed field water pipingshould have heater tape and insulation or a glycolmixture to prevent freezing. Main power is required tokeep the sump heaters and cooler heaters on.

When installing pressure taps to measures the amountof pressure drop across the water side of the cooler,the taps should be located in the water piping aminimum of twenty-four (24) inches downstream fromany connections (flange, elbow, etc.).

There are many piping and control systems which maybe used to assure constant water flow through thecooler. A typical system is shown in Figure 2.7A. Ituses a three way motorized valve which operates inresponse to the discharge air temperature of the coolingcoil.

Another system which is sometimes used consists of atwo way modulating control valve, which also respondsto the discharge air temperature of the cooling coil,used in conjunction with a spring loaded bypassregulating valve as shown in Figure 2.7B. The bypassvalve must be set to assure the full flow of circulatingchilled water when the modulating valve is completelyclosed.

Other systems are noted in the ASHRAE Handbook andmay serve equally well. Whatever system is selected,water flow must be constantly maintained through thechiller.

If the system is arranged for the dual purpose of coolingin the summer and heating in the winter, the coolermust be valved off during the heating season so thathot water will not pass through the cooler. This maybe either a manual or automatic change-over operation.There are also times, such as early spring and late fall,

2.7 Piping ConnectionsACDR-B/AUDR-B

when both heating and cooling are required. Thisshould also be considered when designing heating andcooling systems. For various piping arrangementsconsult the ASHRAE Handbook.

2.7.2 Water ConnectionsMultiple Packaged Chillers

Multiple unit packaged chillers have been successfullyapplied to parallel and series piping systems for years.Special attention, however, must be given to theparticulars involved for each application or seriousoperational problems can result.

The following are guidelines which should be followedfor multiple unit application.

NOTE: A constant chilled water flow rate is assumed tobe maintained through all coolers.

2.7.2.1 Parallel Chilled Water Flow UnitsBoth units operate simultaneously, modulating withload variations. Each packaged chiller operatingthermostat senses leaving water temperature usingstandard controls (See Figure 2.7C). The set point ofeach thermostat will be set to maintain the desiredunloading. In addition, for each chiller package, theoptional suction sensing hot gas by-pass valve providesmodulating capacity reduction to approximately 10%on single compressor models with hot gas bypass.

2.7.2.2 Series Chilled Water Flow UnitsUnits should be equally sized. The upstream unit willcarry a larger load because it cools higher temperaturewater. The thermostats sense leaving fluid temperatures(See Figure 2.7D). The Number 1 unit thermostat willunload or cycle off the packaged chiller beforeunloading occurs on the Number 2 unit.

2.7.3 Water Quality ACDR-BCoolers used in these packages are made of steel, copperand brass and are suitable for operation with well-maintained water systems. However, if the water usedin cooler is corrosive, high in mineral content orentrained solids, the water can cause reduced perfor-mance and even failure of heat exchangers. Therefore,it may be necessary to obtain the services of a watertreatment consultant and to provide and maintain watertreatment. This is particularly important with glycolsystems.

See Maintenance Section 4.0 Paragraph 4.4 formaintenance of heat exchangers.

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42

2.0 INSTALLATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

2.7.4 Condensing Unit ConnectionsAUDR-B

2.7.4.1 GeneralThe AUDR-B condensing unit may be connected to eithera cooling coil or a remote cooler. When makingconnections, all refrigerant piping should be installedin accordance with local or state codes and the latestissue of ANSI/ASHRAE Standard 15 “Safety Code forMechanical Refrigeration”. Hard drawn type L or Kcopper tubing should be used. Soft tubing, wherebending is required, may be used providing it isprotected in accordance with the local code restrictions.

Careful considerations must always be given to sizingthe liquid line and suction line. For sizing lines, refer toCompressor Piping Manual, Form No. 4120.1 or ASHRAEHandbook.

A suction to liquid heat exchanger must be used if theevaporator is installed more than 30 ft. above thecondensing unit or if the pressure drop in the liquidline exceeds 15 psi. This is necessary to prevent flashinggas at the expansion valve.

When a unit is provided with the hot gas bypass option,a hot gas regulator and solenoid will be mounted atthe condensing unit. The contractor must furnish aninsulated hot gas line with check valve. The line mustbe piped for an evaporator coil or cooler as shown inFigure 2.7E.

For information concerning the installation, operationand servicing of Dunham-Bush coolers, consult the latestrevision of Form 8110.

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43

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2.0 INSTALLATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

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R-OUT R-IN

W-INW-OUT

R-OUT R-IN

CHILLER

CHILLER

No. 2

No. 1

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FLUID-IN FLUID-OUT

R-OUT R-IN

CHILLER

CHILLER

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44

2.0 INSTALLATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

All units are wired as completely as possible at the factoryprior to delivery. The connections which must be made bythe installer are to the main power source, control powersource, separate chiller heater power source and interlockingthe satellite equipment. In connecting power wiring to theunit, the following precautions should be taken:

• All field wiring is to be in accordance with the NationalElectrical Code and state and local codes.

• All wiring is to be checked for damage and all terminalconnections tested for tightness. Unit terminal blocks areto be connected with copper conductors only, sized perampacity listed on unit data plate.

2.8 Electrical ConnectionsACDR-B/AUDR-B

• The power supply should match the unit nameplate involts, phase and Hertz. Voltage must be within ± 10% ofnameplate value and voltage imbalance between phasesmust not exceed 2%.

• For minimum circuit ampacity and maximum fuse size,see Unit Nameplate.

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45

UnitCirc. #1 Circ. #2 Each Compressor Condenser Fan Motors

ACDR-B Nom. MFS/ MFS/ Qty / Total FLA Model Volts RLA MCA HACR RLA MCA HACR Circuit RLA LRA-XL LRA-PW Qty HP kW Each

AK 200 86 104 175 — — — 73.7 428 250 5.9

021SAN 230 86 104 175 — — —

173.7 428 250

2 1.5 2.95.9

AR 460 43 53 80 — — — 36.9 214 132 3.0AS 575 35 43 70 — — — 30.8 172 N/A 2.1AK 200 97 118 200 — — — 84.4 470 292 5.9

024SAN 230 97 118 200 — — —

184.4 470 292

2 1.5 2.95.9

AR 460 49 59 100 — — — 42.2 235 141 3.0AS 575 40 49 80 — — — 35.3 200 N/A 2.1AK 200 106 130 200 — — — 94.2 565 340 5.9

027SAN 230 106 130 200 — — —

194.2 565 340

2 1.5 2.95.9

AR 460 54 65 110 — — — 47.1 283 156 3.0AS 575 41 50 80 — — — 35.9 230 N/A 2.1AK 200 139 170 250 — — — 121.2 650 400 5.9

030SAN 230 130 158 250 — — —

1112.2 594 340

3 1.5 4.355.9

AR 460 69 83 125 — — — 59.2 297 195 3.0AS 575 48 58 90 — — — 41.3 245 N/A 2.1AK 200 153 186 300 — — — 134.6 754 463 5.9

035SAN 230 145 177 300 — — —

1126.9 594 340

3 1.5 4.355.9

AR 460 73 89 150 — — — 63.5 297 195 3.0AS 575 55 67 110 — — — 48.0 245 N/A 2.1AK 200 139 148 200 — — — 59.7 308 188 4.8

030DAN 230 139 148 200 — — —

259.7 308 188

4 1 4.04.8

AR 460 70 75 100 — — — 30.1 154 104 2.4AS 575 52 58 80 — — — 22.7 135 N/A 1.5AK 200 138 146 200 — — — 59.2 374 222 4.8

035DAN 230 138 146 200 — — —

259.2 374 222

4 1 4.04.8

AR 460 69 73 100 — — — 29.6 187 108 2.4AS 575 50 55 70 — — — 21.7 135 N/A 1.5AK 200 171 190 250 — — — 73.7 428 250 5.9

040DAN 230 171 190 250 — — —

273.7 428 250

4 1.5 5.85.9

AR 460 86 96 125 — — — 36.9 214 132 3.0AS 575 70 78 100 — — — 30.8 172 N/A 2.1AK 200 192 216 300 — — — 73.7/94.2 428/565 250/340 5.9

045DAN 230 192 216 300 — — —

1+173.7/94.2 428/565 250/340

4 1.5 5.85.9

AR 460 96 108 150 — — — 36.9/47.1 214/283 132/156 3.0AS 575 76 85 110 — — — 30.8/35.9 172/230 N/A 2.1AK 200 203 226 300 — — — 84.4/94.2 470/565 292/340 5.9

050DAN 230 203 226 300 — — —

1+184.4/94.2 470/565 292/340

4 1.5 5.85.9

AR 460 102 114 150 — — — 42.2/47.1 235/283 141/156 3.0AS 575 80 89 110 — — — 35.3/35.9 200/230 N/A 2.1AK 200 212 236 300 — — — 94.2 565 340 5.9

052DAN 230 212 236 300 — — —

294.2 565 340

4 1.5 5.85.9

AR 460 107 118 150 — — — 47.1 283 156 3.0AS 575 81 90 125 — — — 35.9 230 N/A 2.1AK 200 239 270 350 — — — 121.2/94.2 650/565 400/340 5.9

055DAN 230 230 259 350 — — —

1+1112.2/94.2 594/565 340/340

4 2 5.85.9

AR 460 119 134 175 — — — 59.2/47.1 297/283 195/156 3.0AS 575 86 96 125 — — — 41.3/35.9 245/230 N/A 2.1

2.0 INSTALLATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

2.8.1 Electrical Data (60Hz/3PH)

NOTES: RLA - Rated Load Amps at ARI Conditions of ServiceMCA - Minimum Circuit Ampacity *Replace (2) 1.5 HP motors with (2) 1 HP motorsMFS/HACR - Maximum Fuse or HACR Breaker Size - Protective Device on units with low ambient optionLRA-XL - Locked Rotor Amps Standard Across the Line Starting N/A - Not AvailableLRA-PW - Locked Rotor Amps Q Option Part Wind Starting

IMPORTANT: See additional notes on pages 49 and 50.

*

*

*

*

*

*

*

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46

ACDR-B Nominal Model Voltage Qty Size Range Qty Size range Qty Size range

AK 200 1 #12 TO 2 / 0 1 #3 TO 3 / 0 1 #3 TO 3 / 0

021SAN 230 1 #12 TO 2 / 0 1 #3 TO 3 / 0 1 #3 TO 3 / 0AR 460 1 #12 TO 2 / 0 1 #3 TO 3 / 0 1 #3 TO 3 / 0AS 575 1 #12 TO 2 / 0 1 #3 TO 3 / 0 1 #3 TO 3 / 0AK 200 1 #12 TO 2 / 0 1 #3 TO 3 / 0 1 #3 TO 3 / 0

024SAN 230 1 #12 TO 2 / 0 1 #3 TO 3 / 0 1 #3 TO 3 / 0AR 460 1 #12 TO 2 / 0 1 #3 TO 3 / 0 1 #3 TO 3 / 0AS 575 1 #12 TO 2 / 0 1 #3 TO 3 / 0 1 #3 TO 3 / 0AK 200 1 #12 TO 2 / 0 1 #6 TO 350MCM 1 #6 TO 350MCM

027SAN 230 1 #12 TO 2 / 0 1 #6 TO 350MCM 1 #6 TO 350MCMAR 460 1 #12 TO 2 / 0 1 #3 TO 3 / 0 1 #3 TO 3 / 0AS 575 1 #12 TO 2 / 0 1 #3 TO 3 / 0 1 #3 TO 3 / 0AK 200 1 #4 TO 500 MCM 1 #6 TO 350MCM 1 #6 TO 350MCM

030SAN 230 1 #4 TO 500 MCM 1 #6 TO 350MCM 1 #6 TO 350MCMAR 460 1 #12 TO 2 / 0 1 #3 TO 3 / 0 1 #3 TO 3 / 0AS 575 1 #12 TO 2 / 0 1 #3 TO 3 / 0 1 #3 TO 3 / 0AK 200 1 #4 TO 500 MCM 1 #6 TO 350MCM 1 #6 TO 350MCM

035SAN 230 1 #4 TO 500 MCM 1 #6 TO 350MCM 1 #6 TO 350MCMAR 460 1 #12 TO 2 / 0 1 #3 TO 3 / 0 1 #3 TO 3 / 0AS 575 1 #12 TO 2 / 0 1 #3 TO 3 / 0 1 #3 TO 3 / 0AK 200 1 #4 TO 500 MCM 2 3 / 0 TO 500MCM N/A

030DAN 230 1 #4 TO 500 MCM 2 3 / 0 TO 500MCM N/AAR 460 1 #4 TO 500 MCM 1 #10 TO 1 / 0 N/AAS 575 1 #12 TO 2 / 0 1 #10 TO 1 / 0 N/AAK 200 1 #4 TO 500 MCM 2 3 / 0 TO 500MCM N/A

035DAN 230 1 #4 TO 500 MCM 2 3 / 0 TO 500MCM N/AAR 460 1 #4 TO 500 MCM 1 #10 TO 1 / 0 N/AAS 575 1 #12 TO 2 / 0 1 #10 TO 1 / 0 N/AAK 200 1 #4 TO 500 MCM 2 3 / 0 TO 500MCM N/A

040DAN 230 1 #4 TO 500 MCM 2 3 / 0 TO 500MCM N/AAR 460 1 #4 TO 500 MCM 1 #10 TO 1 / 0 N/AAS 575 1 #12 TO 2 / 0 1 #10 TO 1 / 0 N/AAK 200 1 #4 TO 500 MCM 2 3 / 0 TO 500MCM N/A

045DAN 230 1 #4 TO 500 MCM 2 3 / 0 TO 500MCM N/AAR 460 1 #4 TO 500 MCM 2 3 / 0 TO 500MCM N/AAS 575 1 #12 TO 2 / 0 1 #10 TO 1 / 0 N/AAK 200 1 #4 TO 500 MCM 2 3 / 0 TO 500MCM N/A

050DAN 230 1 #4 TO 500 MCM 2 3 / 0 TO 500MCM N/AAR 460 1 #4 TO 500 MCM 2 3 / 0 TO 500MCM N/AAS 575 1 #12 TO 2 / 0 1 #10 TO 1 / 0 N/AAK 200 1 #4 TO 500 MCM 2 3 / 0 TO 500MCM N/A

052DAN 230 1 #4 TO 500 MCM 2 3 / 0 TO 500MCM N/AAR 460 1 #4 TO 500 MCM 2 3 / 0 TO 500MCM N/AAS 575 1 #12 TO 2 / 0 1 #10 TO 1 / 0 N/AAK 200 1 #4 TO 500 MCM 2 3 / 0 TO 500MCM N/A

055DAN 230 1 #4 TO 500 MCM 2 3 / 0 TO 500MCM N/AAR 460 1 #4 TO 500 MCM 2 3 / 0 TO 500MCM N/AAS 575 1 #12 TO 2 / 0 1 #10 TO 1 / 0 N/A

2.0 INSTALLATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

2.8.2 Field Wiring — Electrical Data (60Hz/3PH)

NOTE: Single point power is standard for all voltages listed on ACDRB021-090 N/A - Not Available

Standard Field Wiring Data Optional Field WiringWire Size Range and Quantity Wire Size Range and Quantity

Single / Dual Point Power Source Single Point Power SourceStandard Optional Optional

Terminal Block Unit Mtd. Disc. Swt. Terminal BlockWire Wire Wire

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47

Circ. #1 Circ. #2 Each Compressor ACDR-B Nom. MFS/ MFS/ MFS/ Qty / Total FLA Model Volts RLA MCA HACR RLA MCA HACR RLA MCS HACR Circuit RLA LRA-XL LRA-PW Qty HP kW Each

AK 200 278 309 400 — — — — — — 121.2 650 400 5.9

062DAN 230 260 288 400 — — — — — —

2112.2 594 340

6 1.5 8.75.9

AR 460 137 152 200 — — — — — — 59.1 297 195 3.0AS 575 99 110 150 — — — — — — 43.0 245 N/A 2.1AK 200 305 339 450 — — — — — — 134.6 754 463 5.9

070DAN 230 290 321 400 — — — — — —

2126.9 594 340

6 1.5 8.75.9

AR 460 145 161 200 — — — — — — 63.5 297 195 3.0AS 575 109 121 150 — — — — — — 48.0 245 N/A 2.1AK 200 332 373 500 — — — — — — 134.6/162 754/1070 463/654 5.9

075DAN 230 325 365 500 — — — — — —

1+1126.9/162 594/1070 340/654

6 1.5 8.75.9

AR 460 169 191 250 — — — — — — 63.5/87 297/535 195/330 3.0AS 575 128 145 200 — — — — — — 48.0/67 245/405 N/A 2.1AK 200 360 400 500 — — — — — — 162 1070 654 5.9

080DAN 230 360 400 500 — — — — — —

2162 1070 654

6 1.5 8.75.9

AR 460 192 214 300 — — — — — — 87 535 330 3.0AS 575 147 164 225 — — — — — — 67 405 N/A 2.1AK 200 364 385 450 — — — — — — 84.4/73.7 470/428 292/250 5.9

085DAN 230 364 385 450 — — — — — — 1+1 84.4/73.7 470/428 292/250

8 1.5 11.65.9

AR 460 196 207 250 — — — — — — 1+1 45.0/40.6 235/214 141/132 3.0AS 575 155 164 200 — — — — — — (4) 38.0/30.8 200/172 N/A 2.1AK 200 383 407 500 — — — — — — 94.2/73.7 565/428 340/250 5.9

090DAN 230 383 407 500 — — — — — — 1+1 94.2/73.7 565/428 340/250

8 1.5 11.65.9

AR 460 192 204 250 — — — — — — 1+1 47.1/36.9 283/214 156/132 3.0AS 575 159 169 200 — — — — — — (4) 40.0/30.8 230/172 N/A 2.1AK 200 203 226 300 203 226 300 405 428 500 94.2/84.4 565/470 340/292 5.9

100DAN 230 203 226 300 203 226 300 405 428 500 1+1 94.2/84.4 565/470 340/292

8 1.5 11.65.9

AR 460 203 215 250 — — — — — — 1+1 47.1/42.2 283/235 156/141 3.0AS 575 160 169 200 — — — — — — (4) 35.9/35.3 230/200 N/A 2.1AK 200 236 263 350 236 263 350 472 498 600 106 565 340 5.9

102DAN 230 236 263 350 236 263 350 472 498 600 1+1 106 565 340

8 1.5 11.65.9

AR 460 236 250 300 — — — — — — 1+1 53 283 156 3.0AS 575 161 170 200 — — — — — — (4) 35.9 230 N/A 2.1AK 200 245 273 350 245 276 350 490 521 600 121.2/94.2 650/565 400/340 5.9

112DAN 230 226 264 350 226 264 350 452 500 600 1+1

.112.2/94.2 594/565 340/340

10 1.5 14.55.9

AR 460 243 258 300 — — — — — — 1+1 59.2/47.1 297/283 195/156 3.0AS 575 176 186 225 — — — — — — (4) 41.3/35.9 245/230 N/A 2.1AK 200 276 307 400 276 307 400 551 582 700 123 650 400 5.9

120DAN 230 276 307 400 276 307 400 551 582 700 2+2 123 594 340

10 1.5 14.55.9

AR 460 274 290 350 — — — — — — 61 297 195 3.0AS 575 197 208 250 — — — — — — (4) 44 245 N/A 2.1AK 200 286 319 450 286 319 450 571 605 700 134.6/121.2 650/754 463/400 5.9

130DAN 230 271 303 400 271 303 400 542 574 700 1+1 129.0/112.2 594/594 340/340

10 1.5 14.55.9

AR 460 276 292 350 — — — — — — 1+1 63.5/59.2 297/297 195/195 3.0AS 575 200 212 250 — — — — — — (4) 48.0/41.3 245/245 N/A 2.1AK 200 314 349 450 314 349 450 627 662 800 139 754 463 5.9

140DAN 230 314 349 450 314 349 450 627 662 800 2+2 139 594 340

12 1.5 17.45.9

AR 460 318 336 400 — — — — — — 70.5 297 195 3.0AS 575 241 254 300 — — — — — — (4) 53.8 245 N/A 2.1

2.0 INSTALLATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

2.8.1 Electrical Data (60Hz/3PH)

NOTES: RLA - Rated Load Amps at ARI Conditions of ServiceMCA - Minimum Circuit Ampacity *Replace (2) 1.5 HP motors with (2) 1 HP motorsMFS/HACR - Maximum Fuse or HACR Breaker Size - Protective Device on units with low ambient optionLRA-XL - Locked Rotor Amps Standard Across the Line Starting N/A - Not AvailableLRA-PW - Locked Rotor Amps Q Option Part Wind Starting

IMPORTANT: See additional notes on pages 49 and 50.

*

*

*

*

*

*

*

Condenser FanMotors

Option SinglePoint Power

Unit Unit

*

*

*

*

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48

ACDR-B Nominal Model Voltage Qty Size Range Qty Size range Qty Size range Qty Size Range

AK 200 1 #4 TO 500MCM 2 3 / 0 TO 500MCM N/A N/A

062DAN 230 1 #4 TO 500MCM 2 3 / 0 TO 500MCM N/A N/AAR 460 1 #4 TO 500MCM 2 3 / 0 TO 500MCM N/A N/AAS 575 1 #12 TO 2 / 0 1 #6 TO 350MCM N/A N/AAK 200 1 #4 TO 500MCM 2 3 / 0 TO 500MCM N/A N/A

070DAN 230 1 #4 TO 500MCM 2 3 / 0 TO 500MCM N/A N/AAR 460 1 #4 TO 500MCM 2 3 / 0 TO 500MCM N/A N/AAS 575 1 #12 TO 2 / 0 1 #6 TO 350MCM N/A N/AAK 200 1 #4 TO 500MCM 2 3 / 0 TO 500MCM N/A N/A

075DAN 230 1 #4 TO 500MCM 2 3 / 0 TO 500MCM N/A N/AAR 460 1 #4 TO 500MCM 2 3 / 0 TO 500MCM N/A N/AAS 575 1 #12 TO 2 / 0 #6 TO 350MCM N/A N/AAK 200 2 1 / 0 /TO 600MCM 2 3 / 0 TO 500MCM N/A N/A

080DAN 230 2 1 / 0 /TO 600MCM 2 3 / 0 TO 500MCM N/A N/AAR 460 1 #4 TO 500MCM 2 3 / 0 TO 500MCM N/A N/AAS 575 1 #6 TO 400MCM 1 #6 TO 350MCM N/A N/AAK 200 2 #4 TO 500MCM 2 3 / 0 TO 500MCM N/A N/A

085DAN 230 2 #4 TO 500MCM 2 3 / 0 TO 500MCM N/A N/AAR 460 1 1 / 0 /TO 600MCM 1 #6 TO 350MCM N/A N/AAS 575 1 #4 TO 500MCM 1 #6 TO 350MCM N/A N/AAK 200 2 #4 TO 500MCM 2 3 / 0 TO 500MCM N/A N/A

090DAN 230 2 #4 TO 500MCM 2 3 / 0 TO 500MCM N/A N/AAR 460 1 1 / 0 /TO 600MCM 1 #6 TO 350MCM N/A N/AAS 575 1 #4 TO 500MCM 1 #6 TO 350MCM N/A N/A

AK 2001 #4 TO 500MCM 1 #6 TO 350MCM 2 1 / 0 /TO 600MCM 2 3/0 TO 500MCM

100D1 #4 TO 500MCM 1 #6 TO 350MCM

AN 2301 #4 TO 500MCM 1 #6 TO 350MCM 2 1 / 0 /TO 600MCM 2 3/0 TO 500MCM1 #4 TO 500MCM 1 #6 TO 350MCM

AR 460 2 1 / 0 /TO 600MCM 1 #6 TO 350MCM 1 / 0 /TO 600MCM #6 TO 350MCMAS 575 1 #4 TO 500MCM 1 #6 TO 350MCM #4 TO 500MCM #6 TO 350MCM

AK 2001 #4 TO 500MCM 2 3 / 0 TO 500MCM 2 1 / 0 /TO 600MCM 2 3/0 TO 500MCM

102D1 #4 TO 500MCM 2 3 / 0 TO 500MCM

AN 2301 #4 TO 500MCM 2 3 / 0 TO 500MCM 2 1 / 0 /TO 600MCM 2 3/0 TO 500MCM1 #4 TO 500MCM 2 3 / 0 TO 500MCM

AR 460 2 1 / 0 /TO 600MCM 2 3 / 0 TO 500MCM 1 / 0 /TO 600MCM 3 / 0 TO 500MCMAS 575 1 #4 TO 500MCM 1 #6 TO 350MCM #4 TO 500MCM #6 TO 350MCM

AK 2001 #4 TO 500MCM 2 3 / 0 TO 500MCM 2 1 / 0 /TO 600MCM 2 3/0 TO 500MCM

112D1 #4 TO 500MCM 2 3 / 0 TO 500MCM

AN 2301 #4 TO 500MCM 2 3 / 0 TO 500MCM 2 1 / 0 /TO 600MCM 2 3/0 TO 500MCM1 #4 TO 500MCM 2 3 / 0 TO 500MCM

AR 460 2 1 / 0 /TO 600MCM 2 3 / 0 TO 500MCM 1 / 0 /TO 600MCM 3 / 0 TO 500MCMAS 575 1 #4 TO 500MCM 1 #6 TO 350MCM #4 TO 500MCM #6 TO 350MCM

AK 2001 #4 TO 500MCM 2 3 / 0 TO 500MCM 2 1 / 0 /TO 600MCM 3 #1 TO 500MCM

120D1 #4 TO 500MCM 2 3 / 0 TO 500MCM

AN 2301 #4 TO 500MCM 2 3 / 0 TO 500MCM 2 1 / 0 /TO 600MCM 3 #1 TO 500MCM1 #4 TO 500MCM 2 3 / 0 TO 500MCM

AR 460 2 1 / 0 /TO 600MCM 2 3 / 0 TO 500MCM 1 / 0 /TO 600MCM 3 / 0 TO 500MCMAS 575 1 #4 TO 500MCM 1 #6 TO 350MCM #4 TO 500MCM #6 TO 350MCM

AK 2001 #4 TO 500MCM 2 3 / 0 TO 500MCM 2 1 / 0 /TO 600MCM N/A

130D1 #4 TO 500MCM 2 3 / 0 TO 500MCM N/A

AN 2301 #4 TO 500MCM 2 3 / 0 TO 500MCM 2 1 / 0 /TO 600MCM N/A1 #4 TO 500MCM 2 3 / 0 TO 500MCM N/A

AR 460 2 1 / 0 /TO 600MCM 2 3 / 0 TO 500MCM 1 / 0 /TO 600MCM 3 / 0 TO 500MCMAS 575 1 #4 TO 500MCM 1 #6 TO 350MCM #4 TO 500MCM #6 TO 350MCM

AK 2001 #4 TO 500MCM 2 3 / 0 TO 500MCM 2 #4 TO 500MCM N/A

140D1 #4 TO 500MCM 2 3 / 0 TO 500MCM N/A

AN 2301 #4 TO 500MCM 2 3 / 0 TO 500MCM 2 #4 TO 500MCM N/A1 #4 TO 500MCM 2 3 / 0 TO 500MCM N/A

AR 460 2 1 / 0 /TO 600MCM 2 3 / 0 TO 500MCM 1 / 0 /TO 600MCM 3 / 0 TO 500MCMAS 575 1 #4 TO 500MCM 2 3 / 0 TO 500MCM #4 TO 500MCM 3 / 0 TO 500MCM

2.0 INSTALLATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

2.8.2 Field Wiring — Electrical Data (60Hz/3PH)

NOTES: 1. Single point power is standard on ACDRB021-090 N/A - Not Available2. Dual point power is standard for 200 and 230 volt ACDRB100-2003. Single point power is standard for 460 and 575 volt ACDRB021-200

Standard Field Wiring Data Optional Field WiringWire Size Range and Quantity Wire Size Range and Quantity

Single / Dual Point Power Source Single Point Power SourceStandard Optional Optional Optional

Terminal Block Unit Mtd. Disc. Swt. Terminal Block Unit Mtd. Disc. Swt.Wire Wire Wire Wire

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49

Circ. #1 Circ. #2 Each Compressor ACDR-B Nom. MFS/ MFS/ MFS/ Qty/ Total FLA Model Volts RLA MCA HACR RLA MCA HACR RLA MCS HACR Circ. RLA LRA-XL LRA-PW Qty HP kW Each

AK 200 332 373 500 332 373 500 664 705 800 134.6/162 754/1070 463/654 5.9

155DAN 230 325 365 500 325 365 500 649 690 800 1+1

.126.9/162 594/1070 340/654

12* 1.5 17.45.9

AR 460 341 364 450 — — — — — — 1+1 63.5/89 297/535 195/330 3.0AS 575 264 281 350 — — — — — — (4) 48.0/71 245/405 NA 2.1AK 200 392 436 600 392 436 600 783 828 1000 178 1070 654 5.9

170DAN 230 392 436 600 392 436 600 783 828 1000 2+2 178 1070 654

12* 1.5 17.45.9

AR 460 392 415 500 — — — — — — 89 535 330 3.0AS 575 314 332 400 — — — — — — (4) 72 405 NA 2.1AK 200 405 455 600 405 455 600 809 859 1000 162/201 1070/1070 654/654 5.9

180DAN 230 405 455 600 405 455 600 809 859 1000 1+1 162/201 1070/1070 654/654

14* 1.5 20.35.9

AR 460 460 488 600 — — — — — — 1+1 97/112 535/535 330/330 3.0AS 575 310 328 400 — — — — — — (4) 67/73 405/405 NA 2.1AK 200 405 455 600 405 455 600 809 859 1000 162/201 1070/1070 654/654 5.9

185DAN 230 405 455 600 405 455 600 809 859 1000 162/201 1070/1070 654/654

14* 1.5 20.35.9

AR 460 460 488 600 — — — — — — 97/112 535/535 330/330 3.0AS 575 310 328 400 — — — — — — (4) 67/73 405/405 N/A 2.1AK 200 470 523 700 470 523 700 939 993 1200 214 1070 654 5.9

190DAN 230 470 523 700 470 523 700 939 993 1200 2+2 214 1070 654

14* 1.5 20.35.9

AR 460 482 510 600 — — — — — — 110 535 330 3.0AS 575 318 336 400 — — — — — — (4) 72 405 N/A 2.1AK 200 470 523 700 470 523 700 939 993 1200 214 1070 654 5.9

200DAN 230 470 523 700 470 523 700 939 993 1200 2+2 214 1070 654

14* 1.5 20.35.9

AR 460 482 510 600 — — — — — — 110 535 330 3.0AS 575 318 510 600 — — — — — — (4) 72 405 N/A 2.1

Condenser FanMotors

Option SinglePoint Power

Unit Unit

2.0 INSTALLATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

2.8.1 Electrical Data (60Hz/3PH)

2.8.3 General Electric Notes

1. Main power must be supplied from a single or dualpower source field-supplied fused disconnect(s) usingdual element time delay fuses. Unit models 100Dthru 200D using 200 or 230 volt power require twoseparate power sources (dual power sources). Powersupply is three phase unless otherwise shown.

2. The maximum incoming wire size is 500 mcm. Onunits having a MCA greater than 500 mcm wire, thefactory-supplied field power terminal block willaccept two parallel field wires per pole.

3. Compressor starting is XL or PWS only.

4. Control circuit power (115VAC) must be field-suppliedfrom a separate field-mounted fused disconnect (15amp max. fuse size) unless the factory-mounted andwired control transformer option is ordered.

5. Cooler heater power (115 VAC) must be field-suppliedfrom a separate field-mounted fused disconnect (15amp max. fuse size).

UNIT MODELSCH1 - CH2 -

Optional Optional FLAStandard Cooler 42°F 40°F (4.5°C) Qty. Watts Ea.

(5.5°C) CoolerCooler

021S, 024S,027S, 030S, 027S 1 280 2.3035S, 030D,

035D040D, 045D, 030S, 035S,050D, 052D, 035D 030D, 035D, 1 420 3.5055D, 062D, 040D

070D120D, 130D, 112D 085D

140075D, 080D,085D, 090D, 090D 045D, 050D, 1 560 4.7100D, 102D,

112D062D, 070D,075D, 080D,090D, 100D,

155D, 170D, 102D,180D, 185D, 112D, 120D, 2 560 4.7190D, 200D 130D, 140D,

155D, 170D,180D, 185D,190D, 200D

TABLE 49A COOLER HEATER

NOTES: RLA - Rated Load Amps at ARI Conditions of Service *Replace (2) 1.5 HP motors with (2) 1 HP motorsMCA - Minimum Circuit Ampacity on units with Low Ambient OptionMFS / HACR - Maximum fuse or HACR breaker size, protective device N/A - Not AvailableLRA-XL - Locked Rotor Amps Standard Across the Line StartingLRA-PW - Locked Rotor Amps Q Option Part Wind Starting

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50

ACDR-B Nominal Model Voltage Qty Size Range Qty Size range Qty Size range Qty Size Range

AK 200 1 #4 TO 500MCM 2 3 / 0 TO 500MCM 2 #4 TO 500MCM N/A 1 #4 TO 500MCM 2 3 / 0 TO 500MCM N/A

155D AN 2301 #4 TO 500MCM 2 3 / 0 TO 500MCM 2 #4 TO 500MCM N/A1 #4 TO 500MCM 2 3 / 0 TO 500MCM N/A

AR 460 2 #4 TO 500MCM 2 3 / 0 TO 500MCM 2 1 / 0 TO 600MCM 2 3 / 0 TO 500MCMAS 575 1 #4 TO 500MCM 2 3 / 0 TO 500MCM 1 #4 TO 500MCM 2 3 / 0 TO 500MCM

AK 2002 #4 TO 500MCM 2 3 / 0 TO 500MCM 2 1 / 0 TO 600MCM N/A2 #4 TO 500MCM 2 3 / 0 TO 500MCM 1 #4 TO 500MCM N/A

170D AN 2302 #4 TO 500MCM 2 3 / 0 TO 500MCM 2 1 / 0 TO 600MCM N/A2 #4 TO 500MCM 2 3 / 0 TO 500MCM 1 #4 TO 500MCM N/A

AR 460 2 #4 TO 500MCM 2 3 / 0 TO 500MCM 2 1 / 0 TO 600MCM 2 3 / 0 TO 500MCMAS 575 1 #4 TO 500MCM 2 3 / 0 TO 500MCM 1 #4 TO 500MCM 2 3 / 0 TO 500MCM

AK 2002 #4 TO 500MCM 2 3 / 0 TO 500MCM 2 1 / 0 TO 600MCM N/A2 #4 TO 500MCM 2 3 / 0 TO 500MCM 1 #4 TO 500MCM N/A

180DAN 230

2 #4 TO 500MCM 2 3 / 0 TO 500MCM 2 1 / 0 TO 600MCM N/A2 #4 TO 500MCM 2 3 / 0 TO 500MCM 1 #4 TO 500MCM N/A

AR 460 2 #4 TO 500MCM 2 3 / 0 TO 500MCM 2 #4 TO 500MCM 2 3 / 0 TO 500MCMAS 575 1 #4 TO 500MCM 3 / 0 TO 500MCM 1 #4 TO 500MCM 2 3 / 0 TO 500MCM

AK 2002 #4 TO 500MCM 2 3 / 0 TO 500MCM 2 1 / 0 TO 600MCM N/A2 #4 TO 500MCM 2 3 / 0 TO 500MCM 1 #4 TO 500MCM N/A

185D AN 2302 #4 TO 500MCM 2 3 / 0 TO 500MCM 2 1 / 0 TO 600MCM N/A2 #4 TO 500MCM 2 3 / 0 TO 500MCM 1 #4 TO 500MCM N/A

AR 460 2 #4 TO 500MCM 2 3 / 0 TO 500MCM 2 #4 TO 500MCM 2 3 / 0 TO 500MCMAS 575 1 #4 TO 500MCM 2 3 / 0 TO 500MCM 1 #4 TO 500MCM 2 3 / 0 TO 500MCM

AK 2002 #4 TO 500MCM 2 3 / 0 TO 500MCM 2 1 / 0 TO 600MCM N/A2 #4 TO 500MCM 2 3 / 0 TO 500MCM 1 #4 TO 500MCM N/A

190D AN 2302 #4 TO 500MCM 2 3 / 0 TO 500MCM 2 1 / 0 TO 600MCM N/A2 #4 TO 500MCM 2 3 / 0 TO 500MCM 1 #4 TO 500MCM N/A

AR 460 2 #4 TO 500MCM 2 3 / 0 TO 500MCM 2 #4 TO 500MCM 2 3 / 0 TO 500MCMAS 575 1 #4 TO 500MCM 2 3 / 0 TO 500MCM 1 #4 TO 500MCM 2 3 / 0 TO 500MCM

AK 2002 #4 TO 500MCM 2 3 / 0 TO 500MCM 2 1 / 0 TO 600MCM N/A2 #4 TO 500MCM 2 3 / 0 TO 500MCM 1 #4 TO 500MCM N/A

200D AN 2302 #4 TO 500MCM 2 3 / 0 TO 500MCM 2 1 / 0 TO 600MCM N/A2 #4 TO 500MCM 2 3 / 0 TO 500MCM 1 #4 TO 500MCM N/A

AR 460 2 #4 TO 500MCM 2 3 / 0 TO 500MCM 2 #4 TO 500MCM 2 3 / 0 TO 500MCMAS 575 1 #4 TO 500MCM 2 3 / 0 TO 500MCM 1 #4 TO 500MCM 2 3 / 0 TO 500MCM

2.0 INSTALLATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

Standard Field Wiring Data Optional Field WiringWire Size Range and Quantity Wire Size Range and Quantity

Single / Dual Point Power Source Single Point Power SourceStandard Optional Optional Optional

Terminal Block Unit Mtd. Disc. Swt. Terminal Block Unit Mtd. Disc. Swt.Wire Wire Wire Wire

N/A = Not AvailableNOTE: 1. Dual point power is standard for 200 and 230 volt ACDR-B 100-200.

2. Single point power is standard for 460 and 575 volt ACDR-B 021-200.

6. Crankcase heaters are wired in the control circuit. On unitswith field-supplied control circuit power, the 15 amp fuseddisconnect switch must be closed (on) at all times forheater operation. On units ordered with the controltransformer option, the main unit power field fuseddisconnect (and local safety switch if used) must beclosed (on) at all times for heater operation.

CRANKCASE HEATERTABLE 50AUNIT MODELS Qty. Watts FLA Each

021S, 024S, 027S, 030S 1 100 .8035S 1 200 1.6

030D, 035D, 040D, 045D, 050D, 052D, 2 100 .8055D, 062D

070D, 075D, 080D 2 200 1.6085D, 090D, 100D, 102D, 112D, 120D 4 100 .8

130D 2 100 .82 200 1.6

140D, 155D, 170D, 180D, 185D, 190D, 4 200 1.6195D, 200D

7. The compressor crankcase heaters must be energized for24 hours before the unit is initially started or after aprolonged open disconnect.

8. All field wiring must be in accordance with all applicablelocal and national codes.

9. Minimum and maximum unit supply voltages are shownin the following tabulated data.

Nominal Minimum Maximum200V 187V 220V230V 207V 253V460V 414V 506V575V 518V 632V

Supply Voltage

2.8.2 Field Wiring — Electrical Data (60Hz/3PH)

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51

2.0 INSTALLATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

2.9 Refrigerant ChargingProcedure ACDR-B/AUDR-B

2.9.1 General Refrigerant ChargingProcedures

The ACDR-B units are charged at the factory with therefrigerant for which they were designed. The typeand amount of refrigerant are shown on the nameplate.

The AUDR-B units have a gas holding charge of therefrigerant type shown on the nameplate.

Prior to charging an AUDR-B split system and after allpiping has been completed, the system must be pressuretested and the system evacuated. For the proceduresto follow, consult the latest revision of Form 4232.

Table 2.9A Refrigerant Line Capacities

Liquid Discharge Suction@ 90°F @ 105° F @ 40°F

5/8 OD 12.0 .72 .30 7/8 OD 24.0 1.35 .51

1 1/8 OD 42.0 2.30 .871 3/8 OD 59.0 3.50 1.331 5/8 OD 74.0 4.96 1.882 1/8 OD 146.0 8.61 3.262 5/8 OD 225.0 13.70 5.03

Line Size, in.

R-22 Refrigerant Line Charge Lbs./100 Ft.

2.9.2 Charge Calculation: CondensingUnit AUDR-B

Prior to charging your AU condensing unit with fieldinstalled lowside, you must first determine the amountof refrigerant required for your system.

Determine the estimated amount for each circuit andcharge each circuit with this amount. To estimatethe amount of charge for one circuit?

1. Multiply the nominal capacity of the circuit by 2.5 toobtain refrigerant charge in pounds.

2. Determine the length of the liquid line. Refer to Table2.9A which gives the refrigerant charge for differentline sizes per 100 ft. Multiply your length per 100 ft.by the amount shown in the table for your line sizeand saturated temperature conditions.

3. Determine the length of the suction line for onecircuit. Refer to Table 2.9A. Multiply your lengthper 100 ft. by the amount shown in the table foryour line size and saturated temperature conditions.

4. Consult the manufacturer of your low side to obtainthe operating charge.

5. Add the amount from steps 1, 2, 3, 4 to obtain anestimated refrigerant charge per circuit.

2.9.3 Charging AUDR-BOnce the estimated amount of charge required for yoursystem has been determined and the system is leak free,you are ready to begin charging the system.

To charge the unit, attach a drum of refrigerant to thebackseating port of the liquid line valve. Purge thecharging line to remove air, invert the drum and openit to the system. A set of scales should be used toweigh the drum before and after charging to determinethe amount of refrigerant charged into the system.

After the system has been charged and the machine isrunning, the system should once again be checked forleaks to make sure that no leaks have occurred duringthe handling of the equipment.

The unit, if possible, should be operated at full loaddesign conditions and the sight glass at the evaporatorshould be checked. When the sight glass for each circuitclears, compare the temperature of liquid leaving thesubcooler with that leaving the condenser. Thetemperature differernce, subcooling, should be 15°F to20°F.

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52

3.0 OPERATION ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

3.1 Qualified Unit Start-up ReportThe unit should be started up only by a refrigerationtechnician who is familiar with accepted operationpractices for refrigeration systems.

Use reciprocating unit start-up report, Form NS1001F,July 1985, to record all temperature, pressure, electricalreadings and control settings. A copy must beforwarded to Dunham-Bush, Inc., North AmericanService, Harrisonburg, Virginia before the warranty willbe honored.

3.2 Typical ACDR-B Refrigerant PipingACDRB021S thru 035 are single compressor, singlecircuit units.

ACDRB030D thru 080D are two compressor, two circuitunits.

ACDRB085D thru 200D are four compressor, two circuitunits.

See Figure 3.2A, 3.2B, 3.2C for typical ACDR-B packagedchiller refrigerant piping.

See Figure 3.2D, 3.2E, 3.2F for typical AUDR-Bcondensing unit piping.

NOTE: When the unit is spring mounted, care shouldbe taken to insure that piping is not excessively rigid.See Section 2.6.

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53

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3.0 OPERATION - MECHANICAL SYSTEMS (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

Figure 3.2A Typical ACDRB021S-035S Packaged Chiller Refrigterant PipingSingle Compressor — Single Circuit Unit

Figure 3.2B Typical ACDRB030D-080D Packaged Chiller Refrigterant PipingTwo Compressor — Two Circuit Unit

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54

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3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

Figure 3.2C Typical ACDRB085D-200D Packaged Chiller Refrigterant PipingFour Compressor — Four Circuit Unit

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55

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3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

Figure 3.2D Typical ACDRB021S-035S Packaged Chiller Refrigterant PipingSingle Compressor — Single Circuit Unit

Typical ACDRB030D-080D Packaged Chiller Refrigterant PipingTwo Compressor — Two Circuit Unit

Figure 3.2E

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56

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3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

Figure 3.2F Typical AUDRB085D-200D Condensing Unit Split-System (Less Evaporator)Refrigerant Piping. Four Compressor — Four Circuit Unit

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57

3.3 Pre-Start-Up Procedure forACDR-B Packaged Chillers &AUDR-B Split Systems

The unit is ready for start-up when the followingprocedures have been completed.

1. Water piping for the cooler is installed and tested.

2. Electrical connections are made and properly fused.

3. Unit has been leak tested, leaks corrected, and chargecompleted.

4. Compressor crankcase heater(s) has been energizedfor a minimum of 24 hours.

5. Calibrated refrigerant gages have been connectedto the suction and discharge pressure ports.

6. Turn on the chilled water pump, check direction ofrotation and adjust the water flow through the coolerto the specified flow rate. Bleed off all entrained air.

7.Manually energize the fan starters and check the fanrotation. Fans should pull air through the condensercoil and discharge vertically upwards. Rotation canbe changed on 3-phase motors by interchanging onlytwo wires on the main terminal block.

8. Check all refrigerant valves to be sure they are open.

9. Proceed to System Start-up.

3.4 System Start-Up & Reportingfor ACDR-B Packaged Chillers& AUDR-B Split-Systems

1. Request for Start-Up Representative ACDR-B/AUDR-B

Start-up service is an option for these units and isrequested when the unit is ordered. If you purchasedstart-up service, then after the installation has beencompleted and checked, Form 9180 must be filledout and sent to the local Dunham-Bushrepresentative who sold the unit. Following receiptof this signed form, a representative will be sent tothe customer. The purchaser should have competentservice and operating personnel in attendance toassist in the work involved, and also to be trained inthe operation and maintenance of this unit.

3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

The representative will inspect the installation todetermine whether it meets Dunham-Bush, Inc.requirements, perform the initial start-up of theinstallation, determine whether it is in satisfactoryoperating condition, and instruct specified customerpersonnel in its operation and maintenance for thelength of time specified in the purchase contract.

NOTE: Sump oil heaters should be energized aminimum of 24 hours and the oil sump temperaturemust be at a minimum of 100°F (38°C) prior to arrivalof start-up representative. This will ensure that theoil is warm enough to vaporize any dissolvedrefrigerant and that the oil is within the normaloperating temperature range.

2. Before starting the compressor(s), check all threephases of supply voltage, of all legs of the motor.They must be within ± 10% of the nameplate voltage.

3. Start compressor(s), check the gages and note if thepressures are within the prescribed limits.

4. Check the refrigerant sight glass at the TX Valve tobe sure it is free of bubbles. If not, charge as specifiedper section 4.8 Charging.

5. Shut the compressor down and check the compressorcrankcase sight glass for oil level. It should bebetween 1/2 to 3/4 of the complete sight glass. Ifnot, see Section 3.7 Lubrication.

6. Restart the compressor. After an hour of operationthe expansion valve superheat setting should bechecked, it should be between 8° and 12°F at fullload design conditions. In some instances, it will benecessary to lower the superheat setting to ensureproper distribution. Turn the TX valve adjustmentstem clockwise to increase the superheat setting andcounterclockwise to decrease the setting. Be sureand allow ample time between each adjustment forthe system to rebalance.

7. The electrical control settings should be checked and,if necessary, reset to those settings indicated on thewiring diagram. Safety controls are factory set andmust be maintained at settings indicated on thewiring diagram.

8. The temperatures of the chilled water both in andout, should be checked to insure the unit is operatingwithin the desired temperatures.

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58

3.6 System Flow Rate ACDR-B

The quantity of chilled water being circulated can beestimated by determining the water pressure dropthrough the cooler and reading GPM from theappropriate pressure drop curve, Table 3.6A.

An alternate method of determining GPM is to measurepressure difference from pump inlet to outlet and readGPM from pump curve.

Water flow rate must not vary more than ± 10% fromdesign flow rate.

3.0 OPERATION - MECHANICAL SYSTEMS (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

NOTES:

1. A constant water flow rate is required with aminimum of 3 gallons per ton (3.25 L/kW) water loopvolume increasing up to 10 gallons per ton (10.8 L/kW) for process, low load applications with smalltemperature ranges and/or vastly fluctuating loadconditions.

2. AUDR-B 160-270 split system chillers use the samecoolers as the ACDR-B 160-270 packaged chillers.

3. AUDR-B 160-270 split-system remote coolers aresupplied insulated with the refrigeration specialtyparts shipped loose for field installation. (No coolerheaters supplied since the remote cooler option isintended for indoor installation.

3.5 Lubrication ACDR-B/AUDR-B

3.5.1 GeneralAll Discus compressors have an oil pump for pressurelubrication.

3.5.2 Oil LevelObserve oil during operation to see that oil is beingagitated indicating oil pump is functioning properly. Ifther eis any doubt about proper functioning, check oilpres sure by installing gage in the 1/4" pipe tappedopening in the pump cover. Oil pressure differentialshould be 50 psi for Discus. If there is insufficient oilpressure:

1. Reverse direction of compressor. The pump is areversing type.

2. If reversing does not produce oil pres sure, checkthe oil strainer to see if it is plugged. If strainer isclean, replace the complete pump end plateassembly, not just the pump.

3.5.3 Oil TypeIf the oil becomes discolored indicating contamination,the contamination can be eliminated by installing a newfilter-drier in the liquid line and changing the oil.

WARNING: USE ONLY DUNHAM-BUSH APPROVEDREFRIGERATION OIL. WARRANTY WILL BE VOID IF OTHERTHAN APPROVED OIL IS USED.

Oil charge for a complete recharge is shown in thefollowing table. Oil type and approved oils are alsolisted for each compressor. After recharge, the oil levelshould be maintained per section 3.52.

Compressor Oil Charge Oil Type Approved Oils(Ounces)

4D2500 120 150SUS CALUMET R0154D3000 136 150SUS or6D3500 144 150SUS TEXACO WF-326D4000 220 150SUS "8D5000 260 150SUS "

Unit Cooler Curve No. for Table 3.6B

Model Size Std CH1 CH2 42°F(CLR) CH3 40°F(CLR)

021S 1 1 1

024S 1 1 1

027S 1 1 23

030S 2 2 24

035S 3 3 24

030D 25 5 26

035D 25 7 8

040D 6 7 8

045D 7 7 11

050D 9 9 11

052D 9 9 11

055D 9 9 11

062D 10 10 28

070D 10 10 28

075D 12 12 28

080D 12 12 28

085D 13 13 27

090D 13 14 29

100D 14 14 29

102D 14 14 29

112D 14 15 30

120D 16 16 21

130D 16 16 21

140D 16 16 21

155D 18 18 31

170D 20 20 31

180D 20 20 22

185D 22 22 22

190D 20 20 22

200D 22 22 22

TABLE 3.6A

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59

DX COOLER:

PRES

SUR

E D

RO

P W

ATE

R

WATER FLOW RATE

11

22

20211819

1514 1710

974 � 131 2 3

86 5

GPML/S

30 40 50 60 100908070 300200150 600500400 800700 10009002.5 3 3.5 654 1912.59 3825 57

16

2

50

40

30

20

15

10

9

8

7

5

150

120

90

60

45

30

27

24

21

15

FT OFWATERKPa 1211

ENGLISH I.P. AND METRIC S.I. UNITS

TABLE 3.6B

Cooler English I.P. Units Metric S.I. UnitsCurve Minimum Maximum Min. Max.No. Model *Conn. Size GPM GPM Lit./Sec. Lit./Sec.1 CHS007601A 3" NPTE 37 101 2.34 6.392 CHS007601B 3" NPTE 50 164 3.16 10.383 CHS008601A 3" NPTE 56 168 3.54 10.634 CHS010601B 4" NPTE 78 304 4.93 19.235 CHD008601B 3" NPTE 70 227 4.43 14.366 CHD010601A 4" NPTE 62 205 3.92 12.977 CHD010601B 4" NPTE 78 315 4.93 19.238 CHD011601A 4" NPTE 69 206 4.37 13.039 CHD011601B 4" NPTE 86 304 5.44 19.2310 CHD012601B 4" NPTE 94 367 5.94 23.2211 CHD013601A 4" NPTE 80 220 5.06 13.9212 CHD013601B 4" NPTE 101 407 6.39 25.7513 EXD12102J07 4" VIC 158 444 10.00 28.0914 EXD12122J09 4" VIC 153 442 9.68 27.9615 EXD14102J09 5" VIC 140 440 8.86 27.8416 EXD14122J09 5" VIC 169 484 10.69 30.6217 EXD16092J09 6" VIC 143 460 9.05 29.1018 EXD16122J07 6" VIC 236 697 14.93 44.1019 EXD16122J09 6" VIC 191 548 12.08 34.6720 EXD18122J07 8" VIC 267 1060 16.89 67.0721 EXD18122J09 8" VIC 213 740 13.48 46.8222 EXD20122J07 10" VIC 298 816 18.54 51.63

*Non-metric compliance

WATER SIDE PRESSURE DROP ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

Figure 3.6B

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60

3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

3.7 System Control ACDR-B/AUDR-B

3.7.1 Capacity ControlThe standard system capacity control operates asfollows:

Staging of unit capacity in response to system loadrequirements is controlled by the microcomputer, whichmonitors the leaving water temperature.

ACDR-B/AUDR-B021S and 024S have two steps capacitycontrol.

ACDR-B/AUDR-B027S to 035S have three steps capacitycontrol.

ACDR-B/AUDR-B030D to 200D have four "standard"capacity control steps.

ACDR-B/AUDR-B045D to 200D have "optional" extracapacity control steps as shown in Table 3.7.3.

On multiple compressor units, capacity is controlled bya combination of cylinder unloading and compressorstaging.

As the chiller load initially drops, the suction pressureof the compressor(s) starts dropping proportionately,thus balancing minor load variations.

Hot gas by-pass capacity control is used (as an option)to lower the "first on/last off" step of capacity controlto roughly 50%. This effectively provides an additionalstep of capacity control. The use of multiple smallcompressors gives good part load performance energyefficiency ratios (EER). Hot gas by-pass operates byimposing an artificial load on the evaporator. Dischargegas from the compressor is introduced to the liquid-vapor mixture of refrigerant downstream of theexpansion valve. The discharge gas is cooled by theliquid refrigerant present in the turbulence of theevaporator so that the final temperature does not rise.Hot gas by-pass does not offer any energy savings, butdoes allow the cooling capacity of the equipment tovary precisely with the load requirements.

Refer to Table 3.7.2 or Table 3.7.3 to determine thecapacity control scheme for your specific unit.

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61

3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

3.7.2 ACDR-B/AUDR-B “Standard” Capacity Control Staging

021S 0 25 50 100024S 0 25 50 100027S 0 17 33 67 100030S 0 17 33 67 100035S 0 17 33 67 100030D 0 13 25 50 75 100035D 0 13 25 50 75 100040D 0 13 25 50 75 100045D 0 10 21 42 80 100050D 0 10 23 47 82 100052D 0 17 33 50 83 100055D 0 18 36 54 82 100062D 0 17 33 50 83 100070D 0 17 33 50 83 100075D 0 15 31 46 85 100080D 0 13 25 50 75 100085D 0 14 27 50 77 100090D 0 14 28 50 78 100100D 0 15 27 50 77 100102D 0 13 25 50 75 100112D 0 14 27 50 77 100120D 0 13 25 50 75 100130D 0 14 26 50 76 100140D 0 13 25 50 75 100155D 0 11 23 50 73 100170D 0 13 25 50 75 100180D 0 12 23 50 73 100185D 0 12 23 50 73 100190D 0 13 25 50 75 100200D 0 13 25 50 75 100

Hot gas bypass modulates to approximately one-half of the capacity of the first step.

(Ref. SD202-20601)

Percent of Unit Capacity

Co

mp

ress

or

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3%

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mp

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0%

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mp

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7%

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mp

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mp

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on

50%

, 2 o

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mp

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67%

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00%

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mp

. 1,

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mp

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on

100

%

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mp

. 1,

2, 3

, 4 o

n 1

00%

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62

045D 0 12 21 42 59 80 100050D 0 12 23 47 59 82 100052D 0 9 17 33 50 67 83 100055D 0 9 18 36 54 64 82 100062D 0 9 17 33 50 67 83 100070D 0 9 17 33 50 67 83 100075D 0 8 15 31 46 69 85 100080D 0 13 25 38 50 75 88 100085D 0 14 27 37 50 64 77 89 100090D 0 10 19 28 40 50 69 78 90 100100D 0 9 18 27 41 50 68 77 91 100102D 0 9 17 25 42 50 67 75 92 100112D 0 9 18 27 41 50 68 77 91 100120D 0 9 17 25 42 50 67 75 92 100130D 0 9 18 26 41 50 68 76 91 100140D 0 9 17 25 42 50 67 75 92 100155D 0 12 23 42 50 65 73 92 100170D 0 13 25 38 50 63 75 88 100180D 0 12 23 39 50 62 73 89 100185D 0 12 23 39 50 62 73 89 100190D 0 13 25 38 50 63 75 88 100200D 0 13 25 38 50 63 75 88 100

3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

3.7.3 ACDR-B/AUDR-B “Optional” Capacity Control Staging

Percent of Unit Capacity

Un

it M

od

el

Co

mp

ress

or

Off

Min

. Cap

acit

y w

ith

HG

BP

Op

tio

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. 1 o

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See

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)

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mp

. 1 o

n 5

0%

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mp

. 1

on

100

%, 2

on

67%

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mp

. 1

on

67%

, 2 o

n 1

00%

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mp

. 1 o

n 6

7%

Co

mp

. 1 o

n 7

5%

Co

mp

. 1 o

n 1

00%

Co

mp

. 1 o

n 5

0%,

2 o

n 6

7%

Co

mp

. 1 o

n 3

3%,

2 o

n 1

00%

Co

mp

. 1

on

50%

, 2 o

n 1

00%

Co

mp

. 1

on

75%

, 2 o

n 1

00%

Co

mp

. 1

on

100

%, 2

on

100

%

Co

mp

. 1

on

50%

, 2, 3

on

100

%

Co

mp

. 1

on

67%

, 2, 3

on

100

%

Co

mp

. 1

on

50%

, 2, 3

, 4 o

n 1

00%

Co

mp

. 1,

2, 3

on

100

%

Co

mp

. 1

on

67%

, 2, 3

, 4 o

n 1

00%

Co

mp

. 1,

2, 3

, 4 o

n 1

00%

(1) Hot gas bypass modulates to approximately one-half of the capacity of the first step.

(2) ECCS option is not available on ACDRB052D-075D if “ACM” option is ordered.

(Ref. SD202-20603)

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63

3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

3.7.4 Fan Cycling ControlACDR-B/AUDR-B

Fan cycling control is based on the discharge pressureof the refrigerant circuit being cooled by the fans. Seesection 3.9.3.2. The following two versions of fancontrol are used.

1) Standard Unit - Fan Cycling only

2) Low Ambient Option - Combination fan cycling andvariable speed motor control to reach low ambients

NOTE: The variable speed motor is applied in place ofthe motors indicated in Step 1 of the tablebelow and operates as described under SCR insection 3.8.

ACDR-B/AUDR-BFan Cycling Control Chart

ACDR/AUDR Refrig. Fan Number on at Each Step

Model Circuit 1 2 3 4 5 6

021-027S 1 #1 #2

030-035S 1 #1 #2 #3

030-055D 1 #1 #3

2 #2 #4

062-080D 1 #1 #3 #5

2 #2 #4 #6

085-102D 1 #1 #3 #5 #7

2 #2 #4 #6 #8

112-130D 1 #1 #3 #5 #7 #9

2 #2 #4 #6 #8 #10

140-170D 1 #1 #3 #5 #7 #9 #11

2 #2 #4 #6 #8 #10 #12

180-200D 1 #1 #3 #5 #7 #9 #11,13

2 #2 #4 #6 #8 #10 #12,14

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64

3.8 Electrical Controls DescriptionACDR-B/AUDR-B

3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

ChillerLINK - This module converts the communicationprotocol of the microcomputer to an industry standardprotocol. Typically the standard protocols available areBACnet or MODBUS.

CR - Relays (Miscellaneous Control)These relays provide the necessary circuit logicfor lock-in, lock-out and transfer functions.

CT - Current Transformer - This device is used by themicrocomputer to measure the current beingdrawn by a compressor.

CWP - Chilled Water Pump Interlock.It is recommended that an interlock betweenthe chilled water pump and the package beprovided to prevent the unit from operatingwith the chilled water pump off. Connect theinterlock to the terminals shown on thediagram.

FLS - Flow Switch. The chilled water flow switch mustbe installed at the job site to ensure chilledwater flow while the package is in operation.

Gateway - This board converts RS485 information fromthe microcomputer to RS232 data for a modemor PC computer.

GFI - Ground Fault Interrupt - The ground fault sensormonitors the compressor and fan motor currentfor leakage to ground. If the leakage exceedsthe setting of the device (4-12 amps), thecontrol circuit power will be turned off.

HTR - Crankcase HeaterEnergized continuously as long as control circuitpower is on and compressor is off. This heatermaintains crankcase temperature above thesystem temperature during the compressor offcycle, preventing refrigerant migration into thecrankcase and consequent compressor damage.

Chiller Heater and Thermostat (Water Chillersonly)-The chiller heater with integral thermostatis powered by a separate customer supplied115VAC source. The heater turns on when theshell temperature drops to 38°F. This helpsprevent a chiller freeze-up under low ambientconditions.

M - Contactor (Compressor and Fan Motor) Thecontactor, operated by the control circuit,provides power to the compressors and fanmotors. Compressor contactors are used eithersingly or in parallel pairs. These devices areamp rated to handle both rated load amps andlocked rotor amps.

3PS - Compressor Oil Failure Switch (Manual Reset)This is a differential pressure switch thatcontinuously compares oil pressure with suctionpressure to provide protection against low netoil pressure. It is equipped with a 120 secondtime delay feature to avoid nuisance shutdowndue to momentary low fluctuations of oilpressure due to oil foaming, etc.

S1 - Power Switch (115V Control Circuit)This switch energizes the control circuit andmust be left on at all times (except fortemporary control circuit service work) to allowoff cycle pumpdown and normal on cycleoperation. (Compressor sump heaters areconnected before this switch and are notaffected by switch position).

S2 - Unit Enable Switch - This switch selects "ON","OFF", or "Remote" for the unit enable. If set to"ON", the unit will be allowed to providecooling. If set to "OFF", the unit will only startto maintain pumpdown and will not providecooling. When the switch is set to "Remote",an external set of contacts must close to allowthe unit to provide cooling.

S3-S6 Compressor Switch. This switch disconnectspower from the corresponding compressorcontrol circuit. These switches should only beused for service work, since pumpdown isdisabled when switch is off.

SCR - Fan Speed Control (Optional)The fan speed control varies the speed of thefan, depending on head pressure. With thedischarge pressure of 140 psig or below, thefan is at minimum speed. As discharge pressurerises, the fan speed is increased proportionallyuntil it reaches full speed at 200 psig. See fancycling control section.

SOL - Liquid Line Solenoid ValveCloses when the compressor(s) is off to preventany liquid refrigerant from accu-mulating in thechiller during the off cycle.

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3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

3.9 DB Director MicrocomputerSystem Control

For units with Electronic Expansion Valveoption, this valve pulses open to meterrefrigerant into the vessel and maintain desiredsuction superheat.

Unload Solenoid - This solenoid will unload thecompressor cylinder bank when the solenoid isenergized.

SSR - Solid State Relay Board (Optional) - This boardprovides the pulsing signal to an electronicexpansion valve.

1TAS - Motor Overload ProtectionCompressor overload protection is afforded bysolid state device (1TAS) that monitors internalmotor temperature. If the maximum motortemperature is exceeded, the compressor willshutdown. To reset 1TAS, open the associatedcompressor switch for 5 seconds.

10TR - Timer (Optional) - This timer provides a 1 seconddelay between closing of compressor contactorsfor part wind starting.

UVR - Undervoltage Relay (Optional)Protects the unit from the following electricsupply malfunctions: under-voltage, phasereversal and single phasing. If the UVR trips, acontrol relay will de-energize and open thecontrol circuit. A LED light, located on the UVR,will indicate a normal power supply.

Dunham-Bush ACDRB/AUDRB reciprocating packagesare controlled by a microcomputer system. Thecomputer system is composed of a main microcomputerboard (MCB), several types of input/output (I/O) boards,and sensors. The I/O boards are connected to themicrocomputer by RS485 shielded cables. Thesehardware components are controlled by the softwareprogram in the microcomputer. The softwaredetermines the state of the output relays based on theinput values.

There are two types of sensor inputs to the computersystem. A digital input indicates whether or not 5VDCvoltage is present at the input. This could be used todetermine whether or not the unit is enabled, a waterflow switch is made, or the status of other on/offdevices.

Another type of sensor input is an analog input. Ananalog value is one that varies continuously, such as atemperature or pressure. An analog input must beconverted to a digital value before the computersoftware can process the data.

The computer system outputs are relays that switch the115 VAC control devices such as contactors andsolenoids. There are eight outputs on the mainmicrocomputer board and eight outputs on each relayoutput board.

The software for the computer is stored in threedifferent types of computer memory chips. The EPROMchip (Electrically Programmable Read Only Memory)stores general operating procedures (algorithms). TheEEROM chip (Electronically Erasable Read Only Memory)stores the program that defines the configuration for aparticular unit. This software is called the configurator.Both of these chips retain their content when power isremoved. The third type of memory is RAM (RandomAccess Memory) and is battery backed and is used forstoring non-essential information.

3.9.1 PrecautionsThe following precautions must be taken while workingwith the microcomputer system.

1. Cover the computer components completelywhen drilling sheet metal near the computer.

2. Strip wires away from microcomputer toprevent strands from falling on components.

3. Do not allow the component boards to get wet.

4. Route control and power wires away fromRS485 cables and sensor wires.

5. Handle boards with care.

6. Use shielded cables for all digital and analogsensor inputs.

3.9.2 Computer OperationThe keypad and display are used to display data andalter setpoints. The display has 2 lines with 16 charactersper line and the keypad has 16 keys. See figure 3.9.2for the outline of the keypad and display.

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66

3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

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3.9.2 Computer Operation (cont.)The keypad has 8 “DISPLAY STATUS” keys and 8 “ENTRY”keys. The number keys, with corresponding function,are:

1 - COMPRESSOR STATUS

2 - CONDENSER STATUS

3 - EVAPORATOR STATUS

4 - ALARM STATUS

5 - SYSTEM PRESSURE

6 - SYSTEM TEMPERATURE

7 - ADDITIONAL STATUS INFO

8 - LOCKOUT STATUS

The “ENTRY” keys are:

SERVICE DIAGNOSTIC

SET POINTS (SAFETIES)

MANUAL (AUTO)

LOCKOUT RESET

PROGRAM OPTIONS

INCREASE (+)

DECREASE (-)

ENTER

Figure 3.9.2

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67

3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

1 – COMPRESSOR STATUS 5 – SYSTEM PRESSURE2 – CONDENSER STATUS 6 – SYSTEM TEMPERATURE3 – EVAPORATOR STATUS 7 – ADDITIONAL STATUS INFO4 – ALARM STATUS 8 – LOCKOUT STATUS

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COMP1 LOADEDLLS 1 ON

COMP2 LOADEDLLS2 ON

COMP1 ONLLS1 ON

ULS1-1 OFF

COMP2 ON

SP DP OPD AMP82 243 24 46

SP DP OPD AMP83 233 26 57

CHIL OUT +44.8FCHIL IN +54.2F

AMP 1 +46.5AUNIT CTL RUN

CHIL FLW YESCHIL RST +0.0F

AMP2 +57.2A

COMP1 = 1015HSTARTS=0000210

LLS1 = 1010HSTARTS =000200

ULS1-1 = 0080HSTARTS = 00230

1 APR 26 0027:37LOW SUCTION #1 ��

1 5P DP OPD AMP 52 215 25 42

2 APR 24 1025:40NO RUN #2

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1 APR 26 0028:37LOW SUCTION #1

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3 APR 20 0815:01POWER RETURNED

4 APR 20 0710:20POWER FAILED

FAN 2 ONFAN 4 ON

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3.9.2.1 Keypad Display Quick Reference—Display Status

To display data from the DISPLAY STATUS keypad, press the desired key to show the first two lines of data.Repressing the same key selects the next two lines, etc. The keypad has 8 numbered “Display Status” keys. Thenumber keys, with corresponding function are:

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68

3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

The “ENTRY” keys are:SERVICE DIAGNOSTICSETPOINTS (SAFETIES)MANUAL (AUTO)LOCKOUT RESETPROGRAM OPTIONSINCREASE (+)DECREASE (-)ENTER

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#1 CHIL OUT TARGENTR CHG +45.0F

#8 PMP DN CUT INENTR CHG +70.0P

#9 PMP DN COUTENTR CHG +40.0P

#27 CND STG1 ONENTR CHG + 190.0P

#28 CND STG2 OFFENTR CHG + 140.0P

#35 FLA CIRCUIT 1ENTR CHG + 55.0A

#36 FLA CIRCUIT 2ENTR CHG + 65.0A

AUTHORIZATIONENTR CHG OPTION

SENSOR OFFSETSENTR CHG OPTION

SENSOR DIAGNOSTICENTR CHG OPTION

CLEAR ALRM HSTRYENTR CHG OPTION

UNIT INFORMATIONENTR CHG OPTION

CONTROL STATUSENTR CHG OPTION

CLEAR PT INFOENTR CHG OPTION

TIME DISPLAYENTR CHG OPTION

DATE & TIME SETENTR CHG OPTION

DAY OF WEEK SETENTR CHG OPTION

OPERATING SCHEDSENTR CHG OPTION

DATE DISPLAYENTR CHG OPTION

RELAY OUTS MANALENTR CHG OPTION

ANALG OUTS MANALENTR CHG OPTION

SENSOR INS MANALENTR CHG OPTION

RESET LOCKTS?ENTER KEY=YES

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3.9.2.2 Keypad Display Quick Reference—ENTRY KEYS

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3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

3.9.2.3 Display Data

To Display Data from the DISPLAY STATUS keys

.1 General Information:• Pressing a key selects the first two lines of

data as shown in Figure 3.9.2.1. Repressingthe same key selects the next two lines, etc.

• The "+" and "_" keys may be used with alarmand lockout status to allow scrolling.

.2 COMPRESSOR STATUS keyThe data from this key is divided into twosections. The first section provides the circuitcontrol state of each of the compressors. Thesecond section is the ON/OFF state of the relayoutputs related to compressor circuit control.

When the button is first pressed, compressor 1state is shown on the first line and liquid linesolenoid or electronic expansion valve status isshown on the second line. Subsequent keypresses display the status for the remainingcompressors. Refer to section 3.9.2.8 for theCircuit Control States. The status for the liquidline is either ON or OFF, whereas for theelectronic expansion valve, the valve percentageof opening and the current superheat value isdisplayed.

After the compressor control states are alldisplayed, subsequent key presses display theON / OFF state of each of the relay outputsrelated to compressor control such ascompressor, liquid line, and unloaders.

.3 CONDENSER STATUS keyThe data from this key is divided into twosections. The first section provides the ON /OFF state of each of the fan control relays. Thesecond section displays the calculated offset tothe fan turn on pressure for each circuit. Thesevalues are labeled "Cond ON Offset" and areadded to the fan turn on setpoint to determinethe actual pressure at which the fan will turnon. See fan control logic description.

.4 EVAPORATOR STATUS keyWhen this key is first pressed, the leaving watertemperature (Chil Out) and the entering watertemperature (Chil In) are displayed. If the chilledwater pump control option is furnished and thekey is pressed again, the On/Off status of thepump and chilled water flow is displayed.

.5 ALARM STATUS keyThe alarm status key displays the most recent32 alarms and lockouts. When the key is firstpressed, the most recent alarm (#1) isdisplayed. The alarm number is displayed inthe upper left corner followed by the month,day, and time of the alarm. The second lineshows the name of the alarm. The Increase(+) and Decrease (-) keys can be used to scrollthrough the alarm listing. See the alarmdescription Section 3.9.2.7.

.6 SYSTEM PRESSURE keyThe system pressure key displays the operatingpressures and amps for each compressor. Thefollowing values are displayed:

1. SP = Suction Pressure

2. DP = Discharge Pressure

3. OPD = Oil Pressure Differential (optional)

4. AMP = Amps of the compressor

When the key is first pressed, these values areshown for compressor 1. Subsequent keypresses display the value of the othercompressors. The compressor number is shownin the upper left corner of the display.

.7 SYSTEM TEMPERATURE keyWhen this key is first pressed, the chiller leavingwater temperature (Chil Out) and chillerentering water temperature (Chil In) values aredisplayed. Subsequent key presses, display allthe sensor input values except the pressures.This includes amps, flow switch, unit controlinput, chilled water reset, and suctiontemperature, if applicable. The sensor inputsrelated to pressure are displayed with theSystem Pressure key.

.8 ADDITIONAL STATUS INFO keyThis key provides the total run hours andnumber of starts for each relay output. Whenfirst pressed, the name of RO #1 (TypicallyComp 1) is shown followed by the total runhours. The second line shows the number ofstarts for that relay output. Subsequent keypresses, scroll through all of the relay outputsand provide the same information.

.9 LOCKOUT STATUS keyThe Lockout Status key is a subset of the AlarmStatus key. Only the chiller setpoint safetyalarms are displayed. These relate to protectingthe machine from abnormal operation. Theinformation displayed for each alarm is thesame as described in the Alarm Status section.

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3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

3.9.2.4 Read and Enter Data

To Read and Enter Data from the ENTRY keys

.1 General Information:Pressing a key selects the first two lines of dataas shown in the Figure 3.9.2.2. Repressing thesame key selects the next two lines, etc.

Different items will appear depending on thepackage configuration, options selected, andauthorization level.

.2 SERVICE DIAGNOSTICS keyThis key cycles through the following menuitems. When the desired menu item is reached,press the ENTER key to display the data.

CONTROL STATUSThis menu item displays the Capacity ControlState and the Evaporator Control State. Thedisplay toggles between these displays everytwo seconds. Refer to the Control StatesSection 3.9.2.8.

AUTHORIZATIONThis menu item is used to enter theAuthorization required to access and makechanges to the microcomputer. When selected,the display shows "ENTER AUTH #XXXX" as aprompt or the four digit code from the numberkeys. As each digit is entered, the Xs changeto 0. When complete, press enter, and theauthorization level is displayed. Four levels ofauthorization are used.

1. VIEW - No authorization is needed to viewdata or reset a lockout.

2. SERVICE - Authorization to access andchange setpoints that are needed for settingup the unit to customer conditions. Typicalauthorization code is #3224.

3. SUPERVISOR - Authorization to access andchange setpoints that are not normallyneeded for configuration of a unit.

4. FACTORY - Allows access to all parameterswith the ability to change the values.

SENSOR OFFSETThis menu item allows sensors to be calibrated.CAUTION: This function should only beperformed by a serviceman with a certifiedaccurate meter. After ENTER is pressed, thesensor can be selected with the Increase/Decrease keys. Then press ENTER again to

adjust the offset value. Use the (+) or (-) keysto change the offset and then press ENTER. Thisoffset value is added to the measured value toobtain the calibrated value used by theprogram.

SENSOR DIAGNOSTICThis menu item displays the analog to digitalconversion counts and the volts for each of thesensor inputs. The conversion varies between0 and 1023, and the volts change between 0Vand 5.012V. Use the (+) or (-) keys to scrollbetween sensor numbers.

UNIT INFORMATIONThis menu item displays the followinginformation. Use the (+) or (-) keys to scrollthrough the data.

• Software version and Configuration number• Hardware version• Unit name• Unit serial number• Model name• Manufacturer• Network address - The network address can

be changed by pressing the ENTER key,followed by (+) or (-) to change the numberand then ENTER.

.3 SETPOINTS (SAFETIES) keyThis key is used to display the setpoints andallows modifications if authorized. When firstpressed, setpoint #1 is displayed. Use the (+)or (-) keys to scroll through the setpoints. Whenthe desired setpoint is displayed, press theENTER key to enter the change mode asindicated by a "+/-" symbol. Use the (+) or (-)keys to alter the setpoint value and then pressENTER when done.

.4 MANUAL (AUTO) keyThis key is used only by authorized servicepersonnel for manual control of the unit.

.5 LOCKOUT RESET keyThis key is used to clear a lockout. Press ENTERafter the safety problem is resolved to reset allrelay outputs to computer control.

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3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

.6 PROGRAM OPTIONS keyThis key displays the following information. Usethe (+) or (-) keys to scroll through the menuitems and then press ENTER to select the desiredscreen.

• DATE DISPLAY - shows the current day ofweek, month, date and year.

• TIME DISPLAY - shows the current day ofweek, and time of day.

• DATE & TIME SET -allows adjustment ofmonth, date, year, hour, and minute. The"+/-" symbol is shown below the field to beadjusted. Use the (+) or (-) keys to changethe field and then press ENTER to move tothe next field.

• DAY OF WEEK SET - allows the day of weekto be changed by pressing the (+) or (-) keys.

• OPERATING SCHEDs - allows the 7 dayoperating schedule to be set up. WhenENTER is pressed, a day of the week isdisplayed followed by the Turn On time andthen the Turn Off time in 24:00 format. Usethe (+) or (-) keys to select the day of weekdesired and then press ENTER. The "+/-"symbol is shown below the field to beadjusted. Use the (+) or (-) keys to changethe field and the press ENTER to move tothe next field.

.7 INCREASE (+) and DECREASE (-) keysThese keys are used to scroll through menus ordata values or to select the desired information.The keys are also used to increase or decreasevalues that are being adjusted. When makingvalue changes, the key may be held down forcontinuous adjustments.

.8 ENTER keyThis key is used to select an option beingdisplayed on the screen or to confirm the newvalue after a data change has been made.

3.9.2.5 Capacity Control States

.1 POWERUPThis state is entered when the microcomputeris powered up or the system has been reset.The system will remain in this state forapproximately 2 minutes with all relay outputsoff. This is a time delay to insure the micro hasstable power before turning any points on andto allow external devices to close.

.2 STOPPEDThis state is entered when the Unit Controlsensor input switch is off. When the chiller isin this state, the individual circuit states if active

are moved to the OFF state through the normalstates. One step of capacity will be decreasedper second.

.3 SCH OFFThis state is entered when the active OperatingSchedule is false. When the chiller is in thisstate, the individual circuit states, if active, aremoved to the OFF state through the normalstates. One step of capacity will be decreasedper second.

.4 EVP FLW (No Evaporator Flow)This state is entered when the flow switchsensor input is OFF. When the chiller is in thisstate the individual circuit states, if active, aremoved to the OFF state through the normalstates. One step of capacity will be decreasedper second.

.5 AMB OFF (Low Ambient Temp Off)This state is entered if the ambient temperaturefalls below the low ambient setpoint. Whenthe chiller is in this state, the individual circuitstates, if active, are moved to the OFF statethrough the normal states. One step of capacitywill be decreased per second. When ambientincreases by 5°F above the setpoint, the unitwill be allowed to run.

.6 LOST IOThis state will be entered whenever themicrocomputer loses communications with anyone of the I/O boards that are connected. Whenthis state is entered, the system will generate aLOST I/O alarm which identifies which I/O is off-line. The LOCKOUT RESET key must be pressedto reset the system, after the LOST I/O has beencorrected. In this state, all RO's except theALARM RO are turned OFF.

.7 LOCKOUTThis state is entered whenever a critical situationis encountered that could cause harm to thechiller package. Items such as freeze protection,low pressure, high pressure or high amps willforce the system into this state. Lockouts canbe reset without authorization from the keypad,however, if the lockout condition has not beencorrected, the system will again be forced intothe LOCKOUT state. In this state, all RO's exceptthe ALARM RO are turned OFF.

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3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

.8 OFFThis state is entered when the system has beencleared from the above shutdown states. Thechiller is now ready to move into an active stateto meet the needed capacity.

.9 HOLDINGThis state is entered when one of threeconditions exists:

1) The liquid being cooled is being maintainedat a temperature in the control zone.

2) The temperature is above the targettemperature plus the control zone but thetemperature is decreasing sufficiently. Thisindicates that the temperature is decreasingtoward the target.

3) The temperature is below the control zonebut the slope is increasing sufficiently. Thisindicates that the temperature is increasingtoward the target. This state indicates thatthere is no need to add or subtract fromthe cooling capacity of the chiller package.This state will be exited when more or lesscapacity is required.

.10 UNLDING (Unloading)This state is entered when less capacity isrequired. During this state a variable time delayis implemented, after which the capacity of thepackage will be decreased by one step.

.11 LOADINGThis state is entered when more capacity isrequired. During this state a variable time delayis implemented, after which the capacity of thepackage will be increased by one step.

3.9.2.6 Circuit Control StatesThe action of the circuit control states actually resultsin more, less or no change in the amount of coolingcapacity. The CAPACITY CONTROL STATES enable theindividual circuits to move within their states.

.1 LOST IOThis state is entered when the CAPACITYCONTROL STATE is LOST IO. This indicates aloss of communication between microcomputerboards. The Lockout reset key will move thecircuit to the OFF state.

.2 LOCKOUTThis state is entered when the CAPACITYCONTROL STATE is LOCK OUT or a safety forthis circuit has indicated that a critical situationhas been encountered. Alarms such as (LOWSUCTION) or (HI DISCH PSI) are examples of a

safety. Lockouts can be reset withoutauthorization from the keypad, however, if thelockout condition has not been corrected, thecircuit will again be forced into the LOCKOUTstate.

.3 PUMP DWN (Pump Down)This state is entered whenever the circuit is nolonger wanted on or if the compressor is offwith chiller flow on and suction pressure risesabove the Pumpdown Cutin setpoint. Thecompressor is on and the liquid line solenoid isclosed. This state is active until the suctionpressure reaches the value in the Pumpdowncutout setpoint. The circuit will then move tothe ANTICYC state.

.4 ANTICYCThis state is entered when the PMP DWN statehas been successfully completed. The circuitwill stay in this state with all circuit points offfor the anti-cycle time delay. The circuit willthen move to the OFF state.

.5 OFFThis state is entered when no cooling capacityis required from this circuit or if the prior statewas holding the circuit off line. In this statethe circuit is ready to attempt to provide coolingcapacity if needed.

.6 UNLDEDIn this state all unloaders on the compressorare on and the compressor is supplying theminimum amount of capacity.

.7 U1 LOADThis state only exists for compressors with twounloaders. This state is in effect when the firstunloader solenoid is off and the secondunloader solenoid is on.

.8 LOADEDThis state is when the compressor is fullyloaded. In this state, the circuit is providingthe maximum amount of cooling capacity.

.9 SUC HLD (Suction Pressure Hold)This state is entered when one unloader hasbeen turned off due to low suction pressure.

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.10 DIS HLD (Discharge Pressure Hold)This state is when a fully loaded circuit that hasmore than one step has encountered adischarge pressure that is close to the highpressure trip. In this state, one step of coolingcapacity will be turned off. The circuit willremain in this state for a minimum of fiveminutes before returning to the LOADED stateif the high pressure condition has beencorrected.

.11 SAFETYThis state is entered when a safety trips but alockout is not to be generated. An alarm isgenerated but the system will restart after atime delay (typically 15 minutes). One safetytrip is allowed every 2 hours. If 2nd trip occurswithin 2 hours of the first trip, then the circuitgoes to the LOCK OUT state.

3.9.2.7 ALARMS SECTION

There are three types of alarms that are generated bythe MCS-8 control logic:

• Information only alarms• MCS-8 system alarms and• Chiller set point safety alarms.

All of the alarms have the same format. The alarm isidentified and it is date time stamped. Alarms can beviewed from the MCS-8 by pressing the ALARM STATUS(4) key or from the PConn program.

3.9.2.7.1 Information only alarms

.1 System generated alarmsThe following alarms are generated to provideinformation. They will not cause a change inthe control algorithm such as a lock outcondition or a relay output being forced off.

• Power Failed• Power Returned• Computer Reset• Battery Failed• LCD Failure• HW Date Invalid• HW Time Invalid• SW Date Invalid• SW Time Invalid• Ram Integrity• Watchdog Reset

.2 Alarms as a result of individual action• Alarms Cleared• STPT Changed• RO Manual• AO Manual

3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

• SI Manual• Point Info Clear• Clock Set• CFG Downloaded

.3 Alarms generated by the control algorithmThe following alarms indicate that action takenby the control algorithm:

• Rotated Lead• Daylight Savings

3.9.2.7.2 MCS-8 System AlarmsAlarms are generated by the MCS-8 control algorithm:

.1 Configuration problem alarmsThese alarms indicate a problem with theconfiguration file that has been loaded into thesystem. The system is not operational, aconfiguration must be transmitted to the unitform PConn or the config ship must be replacedwith a valid one.

.2 Missing (3) INVALID alarms and description• MCS-RO8 #1 Lost• MCS-RO8 #2 Lost• MCS-RO8 #3 Lost• MCS-SI8 #1 Lost• MCS-SI8 #2 Lost• MCS-SI8 #3 Lost• Lost IO Shutdown

.3 Key sensors problem alarmsThis alarm indicates a problem with a keysensor; it is either shorted or open. The alarmwill contain ALARM followed by the 8 charactername of the sensor.

• Sensor Fault

The following sensors related to the entiresystem are tested:

• leaving liquid, if failed: lock out the chillersystem

• returning liquid, if failed: alarm only, nolock out

• ambient temperature, if failed: alarm only,no lock out

The following circuit sensors are tested. If theyfail, that circuit only is locked out.

• suction pressure and temperature• discharge pressure and temperature• oil pressure and temperature

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3.9.2.7.3 Chiller Setpoint Safety AlarmsThe chiller algorithm incorporates a number of safetychecks to ensure that the various components that makeup the chiller package are not damaged. These typesof safeties are based upon setpoints. If this type ofsafety trips, the circuit or system state becomes SAFETY.The state will remain as SAFETY for a time delay andthen the system will attempt to run. If the system safetytrips for a second time within two hours, the circuit orsystem state becomes LOCK OUT. By this method themicrocomputer attempts to ride through a transientsystem problem while still protecting the chiller package.

.1 Freeze ProtectionIf the leaving liquid temperature drops belowthe "FREEZE TEMP" set point value, the system,and all circuits, will enter a lockout state and afreeze notification alarm will be generated.

.2 No Chiller Flow ProtectionIf the chiller flow sensor input turns off and aliquid line solenoid output stays ON, all circuitswill be locked off and a No Flow alarm will begenerated.

.3 Low Differential Oil Pressure (optional)If the oil differential pressure drops below thelow oil setpoint value, and it remains there forthe time specified in the safety time of that setpoint, the circuit will be locked out and a lowoil alarm generated. This safety is active onlywhen the compressor is on.

.4 Low Suction PressureIf the suction pressure drops below the LowSuction set point value, and it remains therefor the time specified as follows, the circuit willbe locked out and a low suction alarmgenerated. If the unit does not have an ambienttemperature sensor, the low pressure time delayis two minutes from the time that thecompressor starts. If the unit does have anambient temperature sensor and ambient isabove 40°F, the time delay is also two minutes.Below 40°F, however, the time delay atcompressor start is extended to four minutes.After this initial time delay, the delay beforelockout is 45 seconds from the time that suctionpressure falls below the setpoint.

.5 High Discharge PressureIf the discharge pressure rises above the HIDISCH PSI set point value and it remains therefor one second, the circuit will be locked outand a high discharge alarm generated.

3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

.6 Hi Motor AmpThe full load amps (FLA) of each compressorare stored in FLA COMP # setpoints. If thecompressor amps sensor input rises above theFLA setpoint times the HI AMP % setpointdivided by 100 for 10 seconds, the circuit willbe locked out and a high motor amp alarmgenerated.

.7 No Compressor Proof (No-Run Alarm)If the microcomputer relay output forcompressor control is ON but the amps sensorinput measures a value less than the FLAsetpoint times the LO AMP % setpoint dived by100 for 2 seconds, the compressor is lockedout and No Comp Proof alarm is generated.Typical value for the LO AMP % setpoint is 20%.

.8 Unsafe Suction PressureIf the suction pressure falls below the UnsafeSuction setpoint (typically 10 psig) for 10seconds, the affected circuit will be locked off,and an Unsafe Suction alarm will be generated.

.9 Pumpdown AlarmIf a pumpdown (Compressor ON with liquid linesolenoid OFF) requires more time to completethan the Pump Down Delay (PMP DN DLAY)setpoint, then the circuit will be locked off. APumpdown alarm will be generated.

.10 No-Stop AlarmIf the computer commands a compressor toturn OFF but the amp feedback stays higherthan the LO AMP % setpoint times thecompressor FLA setpoint divided by 100, for 5seconds, then the entire unit will be locked offand the control power relay will be turned off.A No-Stop alarm will be generated.

.11 Low Discharge PressureIf discharge pressure is below the LO DISC PSIsetpoint for 30 seconds while the compressoris operating, the circuit will be locked off on aLow Discharge pressure alarm.

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3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

3.9.2.8 Control States Quick Reference - Chiller ApplicationsControl States tell the user what the system is doing, this information is critical in determining the chiller’s status!

System Reset or Power Returned (delayof 120 seconds or set point value)

Chiller is off because Unit Control sensorinput is in STOP

Unit schedule of operation is holding theunit OFF.

Chiller is off because Chiller Flow sensorinput status is NO.

Chiller is off because Ambient Temp isbelow Low Ambient setpoint

Lost communication to other boards.Chiller is locked out.

Chiller locked out, all points except alarmpoint are OFF.

System ready to run but no coolingcapacity required

Unit running with no change in capacityrequired.

Count down to reduce capacity

Count down to increase capacity

State Description

POWERUP

STOPPED

SCH OFF

EVP FLOW

AMB OFF

LOST IO

LOCKOUT

OFF

HOLDING

UNLDING

LOADING

Lost communication

Safety tripped twice within half hour,circuit locked off

Capacity control state is STOPPED

Pumping down

Delay after turning off circuit

Circuit ready but not required

Compressor ON, all unloaders OFF

1st unloader is OFF, 2nd unloader is ON

Circuit is fully loded, all unloaders areOFF

Holding 1 unloader off until suctionpressure returns to normal

Holding 1 unloader off until dischargepressure returns to normal

Safety tripped not LOCKOUT

State Description

LOST IO

LOCKOUT

STOPPED

PMP DWN

ANTICYC

OFF

UNLDED

U1 LOAD

LOADED

SUC HLD

DIS HLD

Capacity Control States Circuit Control States

SAFETY

Circuit is locked out

Liquid line solenoid (LLS) is closed

LLS is closed with compressor ON topumpout liquid

Electronic expansion valve (EXV) is instart-up mode

Liquid line solenoid is open

EXV is holding at desired opening

EXV is opening

EXV is closing

EXV is closing quickly because superheatis low

State Description

LOCKOUT

CLOSED

PREPUMP

STARTUP

OPENED

HOLDING

OPENING

CLOSING

LOW SPR

Evaporator Control States

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3.9.3 Control Functions and OperationsThe computer system performs the following controlfunctions on reciprocating compressor packages.

1. Compressor and Unloader Staging 2. Fan control 3. Pumpdown control 4. Anti-recycle timing 5. Lead/lag (optional) 6. Chilled water reset 7. Customer control interlock 8. Low pressure unload 9. High pressure unload10. High amp unload11. Low ambient temperature limit (optional)12. Power up delay13. Electronic expansion valve control (optional)

A description of each of these functions follows:

3.9.3.1 Compressor and Unloader StagingRefer to Section 3.7.2 for standard capacity controlstaging and to Section 3.7.3 for optional capacitycontrol staging for a particular unit.

A delay between different compressors starting isimplemented to minimize current inrush and to ensurethat additional capacity is required.

.1 Chiller or DX Coil Control Based on LeavingTemperature

For chiller control or leaving air DX coil control,the computer stages the compressors based onleaving water or air temperature. The controlzone (+) and control zone (-) setpoints arestored in the computer as a temperature offsetfrom desired leaving water or air temperature.The control zone (+) setpoint is where the nextstage of capacity is added, and the control zone(-) setpoint is where the unit capacity isdecreased by one step. If water temperature isfalling at a substantial rate, the unit may stoploading or may decrease capacity beforereaching the control zone (-) setting. After astage transition, a time delay is activated duringwhich another stage transition is not allowed.This lets the system stabilize.

The difference between the control zonesetpoints should be more than the temperaturechange caused by one stage transition toprevent short cycling. Typical control zonesetpoints for a water chiller are control zone(+) = 3.0 and control zone (-) = -2.0. Setpointsfor an air DX coil should be much wider, possiblycontrol zone (+) = 6.0 and control zone (-) = -6.0. In this case, the effect of one stagetransition must be less than 12.0°F at minimumair flow to avoid short cycling.

3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

Before the first stage of a package is allowedto start, the leaving temperature must be abovethe setpoint by the amount stored in the StartDeadband setpoint. This value may be 3°F fora water chiller but may need to be much higherfor a DX coil, possibly 15°F.

Some air handler configurations require anentering air enthalpy sensor to enable/disablethe unit. When enthalpy is above the EnthalpyStart setpoint, the unit is allowed to start andthen maintain desired leaving air temperature.If the entering air enthalpy falls below theEnthalpy Start setpoint minus a smalldeadband, the unit is disabled.

.2 DX Coil Control Based on Return AirTemperature or Enthalpy

The computer stages the compressors based onreturn air temperature or enthalpy. The stage1 shutdown setpoint is stored in the computeras an offset from desired return air temperatureor enthalpy. The stage deadband setpointdefines the On to Off differential for each stage.The inter- stage deadband setpoint defines thedifferential between the turn OFF points of eachsequential stage. A typical setpointconfiguration for a unit with return airtemperature staging is:

SetpointReturn Air Temp 76.0Stage 1 off -4.0Stage Deadband 2.0Inter-stage D/B 1.5

Stage 1 would turn on at a return airtemperature of 76 + (-4.0) + 2.0 = 74.0°F andwould turn off at 76 + (-4.0) = 72.0°F. Stage 2would turn on at a return air temperature of76 + (-4.0) + 1.5 + 2.0 = 75.5°F and wouldturn off at 76 + (-4.0) + 1.5 = 73.5°F, etc.

.3 Suction Pressure Control

Suction pressure control may be needed for asystem with two DX coils serving separate airflows. The building control system must supplya contact closure to enable/disable eachrefrigerant circuit. When the contact is closed,the first compressor on the unit will start andstay on until the contacts open. The unloaderand/or second compressor will be staged basedon a circuit suction pressure setpoint and acontrol zone around that setpoint. The controlzone staging will operate similarly to thedescription in item 1 of this section.

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3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

3.9.3.2 Fan ControlThe fan control is based on the discharge pressures ofthe circuits being cooled by the fans. Refer to section3.7.4 for a correlation of refrigerant circuit to fannumbers for each model. The computer calculates thehighest discharge pressure of the compressors operatingand uses this value to control fans according to the fanpressure setpoints and the internally calculated fan turnon offset.

The Condenser Stage 1 ON setpoint plus the Fan TurnON offset is where fan 1 turns on. The Fan Turn ONoffset is normally 0.0 and is only increased if a fan shortcycles. The effect of this is to automatically widen theon to off differential and reduce fan cycling. TheCondenser Differential ON setpoint defines thedifference between each subsequent fan turn ONpressure. For example: COND Stage 1 ON = 190.0Psig, Fan Turn ON offset = 20.0, and COND DifferentialON = 10.0.

Then Fan stage 1 turn on pressure is 190 + 20 = 210,Fan stage 2 turn on pressure is 190 + 20 + 10 = 220,and Fan stage 3 turn on pressure is 190 + 20 + (2 * 10)= 230, etc.

The Condenser Stage 2 OFF setpoint is where fan 2 turnsoff. The Condenser Differential OFF setpoint definesthe difference between each subsequent fan turn OFFpressure. For example: COND stage 2 OFF = 140 Psig,and COND Differential OFF = 10.0. Then Fan stage 2turn off pressure is 140, Fan stage 3 turn off pressure is140 + 10 = 150, and Fan stage 3 turn off pressure is140 + (2 * 10) = 160, etc.

Condenser Stage 1 turns OFF only if suction pressurefalls below the low suction pressure setpoint for 10seconds and discharge pressure is less than the Fan stage1 turn on pressure.

A compressor must be operating (amps aboveminimum) for the fans to operate.

3.9.3.3 Pumpdown ControlWhen the water temperature does not require coolingor if the unit enable sensor input contacts are open thecomputer maintains a cooler pressure lower than thePumpdown CUT IN setpoint. When suction pressureexceeds the pumpdown CUT IN setpoint, thecompressor is turned on without activating the liquidline solenoid or electronic expansion valve. Then, whenthe suction pressure falls below the Pumpdown CUTOUT setpoint, the compressor is turned off. Thecompressor control state displays PMP DWN when thecompressor is pumping down. A pumpdown will onlybe performed once every 10 minutes as long as chilledwater flow is on.

When chilled water is not flowing, a maximum of twopumpdowns will be performed after which the unit willremain in the OFF state. The pumpdown process ismonitored to protect the cooler. The pumpdown alarmwill lock off the compressor if the pumpdown requiresmore than thirty seconds to complete. This usuallyindicates a faulty liquid line solenoid.

3.9.3.4 Anti-Recycle TimingWhen a compressor is stopped by the computer, a 5minute time delay is initiated during which thecompressor cannot start. A delay is also implementedwhen power is first applied to the computer.

The compressor control state displays ANTICYC whenthe anti-recycle timer is timing.

3.9.3.5 Lead/Lag (optional feature)A factory installed lead/lag option allows the computerto automatically rotate the lead refrigerant circuit. Thefirst compressor of each refrigerant circuit (compressors1 and 3 of a four compressor package) on the unit musthave an unloader for lead/lag to operate. The leadrefrigerant circuit will rotate whenever a refrigerantcircuit shutdown is required or if the time of day passesthrough midnight. The effect is that the first refrigerantcircuit to become active is the first to shut down.

3.9.3.6 Chilled Water/Air ResetThe chilled water/air reset (CHIL RST) sensor input allowsthe customer to raise the leaving water or airtemperature setpoint based on an external signal.

A 0-5VDC signal can be used, where 0VDC is no resetand 5VDC is maximum reset. The maximumtemperature reset can be defined by setting the MAXTRGT RST setpoint to the maximum temperature resetdesired. For example, to obtain a maximum reset of6°F, a 6.0 is stored in MAX TRGT RST.

CAUTION: The voltage input must never exceed 5.0VDC.

3.9.3.7 Customer Control InterlockCustomer supplied time clock (or other on/off logic)control contacts can be used to control the package.The wiring diagram specifies the place to wire thecontrol contacts. The control contacts signal a sensorinput. If the contacts open, the unit will perform apumpdown if needed and then turn off.

Note: This control must be used for automatic controlof the package. Do not use the flow switch to controlthe package.

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3.9.3.8 Low Pressure UnloadAfter the initial start-up, if a refrigerant circuitexperiences a low pressure condition and the circuitcan be unloaded, the circuit will enter a low pressureunload mode. If a compressor on the circuit has anunloader, the unloader will be energized. The circuitcontrol state will display SUC HLD (suction hold).

The unit stays in this condition for the safety delay timeand then reverts to normal operation.

Caution: If this mode of operation repeats, the unitrequires service by a qualified refrigeration technician.

3.9.3.9 High Pressure UnloadIf an operating circuit discharge pressure approachesthe high pressure trip point (typically at 355 psig), andthe compressor has an unloader, the unit will enter ahigh pressure unload mode. The unload solenoid willbe energized. This will help prevent a high pressuretrip. The circuit control state will display DIS HLD(discharge hold).

The unit will stay in this mode for the safety delay timeand then revert to normal operation.

Caution: If this mode of operation occurs, the unitshould be checked immediately for condenser blockage.Otherwise, contact a qualified refrigeration technicianfor service.

3.9.3.10 High Amp Unload (Load Limit)The high amp limit is determined by multiplying the HIAMP % setpoint by the FLA setpoint for the compressorand then dividing by 100. If a compressor's ampmeasurement reaches the high amp limit, and thecompressor has an unloader, the unit will enter a highamp unload mode. The unloader will be activated tounload the compressor. The circuit control state willdisplay AMP HLD (amp hold).

The unit will stay in this mode for the safety delay timeand then revert to normal operation. This mode isnormal if the unit is started with high chiller watertemperature.

Caution: If this mode of operation occurs with chillertemperature near design conditions, the unit shouldbe checked immediately for condenser blockage orabnormal system voltage. Otherwise, contact aqualified refrigeration technician for service.

3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

3.9.3.11 Low Ambient Temperature Limit(optional)

If the ambient temperature drops below the LowAmbient setpoint, the compressors will be put into anAMB OFF state and will not be allowed to run. Theambient temperature must rise 5°F above this setpointbefore the unit will be enabled.

3.9.3.12 Power-up Delay

When power is first applied to the controls, a twominute delay is implemented before a compressor isallowed to start. This allows all external devices to time-out and close their contacts.

3.9.3.13 Electronic Expansion Valve Control(optional)

When a compressor starts, the microcomputer controlsthe electronic expansion valve to maintain the desiredsuperheat (typically 12°F). The expansion valvepercentage of opening and current superheat value aredisplayed on the second line of the Compressor Statusdisplay.

3.9.4 General Servicing ProcedureA general troubleshooting procedure is shown below.

(1) Check compressor status to see if it is lockedoff.

(2) If locked off, check alarms to see cause.(3) Check all sensor inputs for accuracy.(4) Repair mechanical system problem or

electrical system problem.(5) Reset alarm by pressing LOCKOUT RESET KEY

followed by ENTER.(6) Check that all requirements for start-up are

met.(7) Operate machine over full operating

conditions and observe results.(8) Verify that all sensor input values are correct.

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3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

3.9.5A Typical Power Wiring Diagram (Two Compressor Model)

021360

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3.9.5B Typical Control Wiring Diagram (Two Compressor Model)

021369aa

3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

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3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

3.9.5B Typical Control Wiring Diagram (Two Compressor Model) (cont.)

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3.10 CircuitOperation for ACDR-B orAUDR-B Split-System Chillersor AUDR-B Leaving Air Controlfor DX Coil

Typical 2 compressor control sequence of operation with4 steps of capacity control. Refer to 3.9.5B for wiringdiagram.

3.10.1 Unit on standbyMain field disconnect switch closed. 115VAC controlpower on. S1 control switch on. Compressor switcheson. Leaving water or air temperature below leavingtemperature setpoint plus Control Zone + setpoint orunit control contacts open.

Pumpdown during standby --

When the flow switch is ON, any of the compressorsmay come on for a short time and pump down if thereis any low side pressure build up during the standbyperiod. Compressors will be held off line for 10 minutesafter a pumpdown. Immediately following a normal"on" cycle, pumpdowns can be expected as residualliquid in the low side vaporizes.

3.10.2 Run cycle sequence (increaseload)

Water or air flow switch closes and unit control contactsare closed.

3.10.2.1 - STEP 1.1 Leaving water or air temperature rises above

chiller out temperature setpoint plus ControlZone + setpoint.

.2 Anti-cycle timer times out or inter-stage delaytimes out and RO1 closes (up to a 5 minutedelay).

.3 Compressor #1 starts thru RO1. Amp sensor,1CT, indicates current flow. RO2 energizesliquid line solenoid 1SOL and circuit 1refrigerant flow starts. Oil failure switch 3PS-1starts to time open (120 sec. delay). Lowpressure lockout starts to time open (120 sec.delay).

NOTE: If either oil pressure or suction pressureis not establishing at a normal level within theabove times, circuit 1 will shut down.

3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

.4 Compressor #1 unload solenoid is energizedthrough RO3.

.5 Compressor #1 oil and suction pressure rise tonormal levels, and 3PS-1 terminates the timeopen sequence.

1st stage capacity is now On-Line.

3.10.2.2 - STEP 2.6 Leaving water or air temperature rises above

chiller out setpoint plus Control Zone + setpointand stage 1 has been on line for an inter-stagedelay. Compressor #1 unload solenoid is de-energized to LOAD the compressor.

2nd stage capacity is now On-Line.

3.10.2.3 - STEP 3.7 Leaving water or air temperature rises above

chiller out setpoint plus Control Zone + setpointand stage 2 has been on line for an inter-stagedelay.

.8 Compressor #2 starts 100% loaded. Ampsensor 2CT indicates current flow. Themicrocomputer energizes liquid line solenoid 2and circuit 2 refrigerant flow starts. Oil failureswitch 3PS-2 starts to time open (120 sec.delay). Low pressure lockout starts to time open(120 sec. delay).

NOTE: If either oil pressure or suction pressureis not established at a normal level within theabove delay times, circuit 2 will shut down.

.9 Compressor #1 unload solenoid is energizedto unload the compressor.

.10 Compressor #2 oil and circuit #2 suctionpressures rise to normal levels, and 3PS-3terminates the time open sequence.

3rd stage capacity is now On-Line.

3.10.2.4 - STEP 4.11 Leaving water or air temperature rises above

setpoint plus Control Zone + setpoint and stage3 has been on line for an inter-stage delay.Compressor #1 unload solenoid is de-energizedto load the compressor.

100% capacity is now On-Line.

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3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

3.10.3 Run cycle sequence (decreasingload)

3.10.3.1 - STEP 4.1 Leaving water or air temperature falls below

chiller out setpoint minus Control Zone -setpoint and stage 4 has been on line for aninter-stage delay. Compressor #1 unloadsolenoid is energized to unload the compressor.

3rd stage capacity is now On-Line.

3.10.3.2 - STEP 3.2 Leaving water or air temperature falls below

chiller out setpoint minus Control Zone -setpoint and stage 3 has been on for an inter-stage delay. Liquid line solenoid for circuit 2 isde-energized and circuit 2 refrigerant flowstops. Compressor #2 remains running andcircuit 2 pumpdown begins.

.3 When suction pressure drops to the pumpdowncutout setpoint, compressor #2 stops. Circuit#2 pumpdown and unload sequence is nowcomplete, and all circuit 2 controls are back tostandby status.

.4 Compressor #1 unload solenoid is de-energizedto load compressor #1 back to full capacity.

2nd stage capacity is now On-Line.

3.10.3.3 - STEP 2.5 Leaving water or air temperature falls below

chiller out setpoint minus Control Zone -setpoint and stage 2 has been on line for aninter-stage delay. Compressor #1 unloadsolenoid is energized to unload the compressor.

1st stage capacity is now On-Line.

3.10.3.4 - STEP 1.6 Leaving water or air temperature falls below

chiller out setpoint minus Control Zone -setpoint and stage 1 has been on for an inter-stage delay. Liquid line solenoid for circuit 1 isde-energized and circuit 1 refrigerant flowstops. Compressor #1 remains running andcircuit 1 pumpdown begins.

.7 When suction pressure drops to thepumpdown cutout setpoint, compressor #1stops. Circuit #1 pumpdown and unloadsequence is now complete, and all circuit 1controls are back to standby status.

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3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

Unit is off.

3.11 CircuitOperation for AUDRB withSupply Air Temperature orEnthalpy Control for DX Coil

Typical 2 compressor control sequence of operation with4 steps of capacity control. Refer to 3.9.5B for wiringtypical diagram.

3.11.1 Unit on standbyMain field disconnect switch closed. 115VAC controlpower on. S1 control switch on. Compressor switcheson. Return air temperature or enthalpy below desiredreturn air value plus the stage 1 Off setpoint or unitcontrol contacts open.

Pumpdown during standby --

When the flow switch is ON, any of the compressorsmay come on for a short time and pump down if thereis any low side pressure build up during the standbyperiod. Compressors will be held off line for 10 minutesafter a pumpdown. Immediately following a normal"on" cycle, pumpdowns can be expected as residualliquid in the low side vaporizes.

3.11.2 Run cycle sequence (increaseload)

Water or air flow switch closes and unit control contactsare closed.

3.11.2.1 - STEP 1.1 Return air temperatue or enthalpy rises above

return air setpoint plus Stage 1 Off setpoint plusStage Deadband setpoint.

.2 Anti-cycle timer times out or inter-stage delaytimes out and RO1 closes (up to a 5 minutedelay).

.3 Compressor #1 starts thru RO1. Amp sensor,1CT, indicates current flow. RO2 energizesliquid line solenoid 1SOL and circuit 1refrigerant flow starts. Oil failure switch 3PS-1starts to time open (120 sec. delay). Lowpressure lockout starts to time open (120 sec.delay).

NOTE: If either oil pressure or suction pressureis not establishing at a normal level within theabove times, circuit 1 will shut down.

.4 Compressor #1 unload solenoid is energized

through RO3.

.5 Compressor #1 oil and suction pressure rise tonormal levels, and 3PS-1 terminates the timeopen sequence.

1st stage capacity is now On-Line.

3.11.2.2 - STEP 2.6 Return air temperature or enthalpy rises above

return air setpoint plus Stage 1 Off setpoint plusStage Deadband setpoint plus Inter-stageDeadband setpoint and stage 1 has been online for an interstage delay. Compressor #1unload solenoid is de-energized to LOAD thecompressor.

2nd stage capacity is now On-Line.

3.11.2.3 - STEP 3.7 Return air temperature or enthalpy rises above

return air setpoint plus Stage 1 Off setpoint plusStage Deadband setpoint plus two times theInter-stage Deadband setpoint and stage 2 hasbeen on line for an interstage delay.

.8 Compressor #2 starts 100% loaded. Ampsensor 2CT indicates current flow. Themicrocomputer energizes liquid line solenoid 2and circuit 2 refrigerant flow starts. Oil failureswitch 3PS-2 starts to time open (120 sec.delay). Low pressure lockout starts to time open(120 sec. delay).

NOTE: If either oil pressure or suction pressureis not established at a normal level within theabove delay times, circuit 2 will shut down.

.9 Compressor #1 unload solenoid is energizedto unload the compressor.

.10 Compressor #2 oil and circuit #2 suctionpressures rise to normal levels, and 3PS-3terminates the time open sequence.

3rd stage capacity is now On-Line.

3.11.2.4 - STEP 4.11 Return air temperature or enthalpy rises above

return air setpoint plus Stage 1 Off setpoint plusStage Deadband setpoint plus three times theInter-stage Deadband setpoint and stage 3 hasbeen on line for an inter-stage delay.Compressor #1 unload solenoid is de-energizedto load the compressor.

100% capacity is now On-Line.

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3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

3.11.3 Run cycle sequence (decreasingload)

3.11.3.1 - STEP 4.1 Return air temperature or enthalpy falls below

return air setpoint plus Stage 1 Off setpoint plusthree times the Inter-stage Deadband setpointand stage 4 has been on line for an inter-stagedelay. Compressor #1 unload solenoid isenergized to unload the compressor.

3rd stage capacity is now On-Line.

3.11.3.2 - STEP 3.2 Return air temperature or enthalpy falls below

return air setpoint plus Stage 1 Off setpoint plustwo times the Inter-stage Deadband setpointand stage 3 has been on for an inter-stage delay.Liquid line solenoid for circuit 2 is de-energizedand circuit 2 refrigerant flow stops. Compressor#2 remains running and circuit 2 pumpdownbegins.

.3 When suction pressure drops to the pumpdowncutout setpoint, compressor #2 stops. Circuit#2 pumpdown and unload sequence is nowcomplete, and all circuit 2 controls are back tostandby status.

.4 Compressor #1 unload solenoid is de-energizedto load compressor #1 back to full capacity.

2nd stage capacity is now On-Line.

3.11.3.3 - STEP 2.5 Return air temperature or enthalpy falls below

return air setpoint plus Stage 1 Off setpoint plusthe Inter- stage Deadband setpoint and stage2 has been on line for an inter-stage delay.Compressor #1 unload solenoid is energizedto unload the compressor.

1st stage capacity is now On-Line.

3.11.3.4 - STEP 1.6 Return air temperature or enthalpy falls below

return air setpoint plus Stage 1 Off setpoint andstage 1 has been on for an inter-stage delay.Liquid line solenoid for circuit 1 is de-energizedand circuit 1 refrigerant flow stops. Compressor#1 remains running and circuit 1 pumpdownbegins.

.7 When suction pressure drops to thepumpdown cutout setpoint, compressor #1stops. Circuit #1 pumpdown and unloadsequence is now complete, and all circuit 1controls are back to standby status.

Unit is off.

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3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

3.12 CircuitOperation for AUDRB withMultiple EvaporatorsControlled by SuctionPressure at the Unit

Typical 2 compressor control sequence of operation with4 steps of capacity control. Refer to 3.9.5B for wiringdiagram.

3.12.1 Unit on standbyMain field disconnect switch closed. 115VAC controlpower on. S1 control switch on. Compressor switcheson. Return air temperature or enthalpy below desiredreturn air value plus the Stage 1 Off setpoint or unitcontrol contacts open.

Pumpdown during standby --

When the flow switch is ON, any of the compressorsmay come on for a short time and pump down if thereis any low side pressure build up during the standbyperiod. Compressors will be held off line for 10 minutesafter a pumpdown. Immediately following a normal"on" cycle, pumpdowns can be expected as residualliquid in the low side vaporizes.

3.12.2 Run cycle sequence (increaseload)

Water or air flow switch closes and unit control contactsare closed.

3.12.2.1 - STEP 1.1 Building control system closes circuit 1 start

contact.

.2 Anti-cycle timer times out or inter-stage delaytimes out and RO1 closes (up to a 5 minutedelay).

.3 Compressor #1 starts thru RO1. Amp sensor,1CT, indicates current flow. RO2 energizesliquid line solenoid 1SOL and circuit 1refrigerant flow starts. Oil failure switch 3PS-1starts to time open (120 sec. delay). Lowpressure lockout starts to time open (120 sec.delay).

NOTE: If either oil pressure or suction pressureis not establishing at a normal level within theabove times, circuit 1 will shut down.

.4 Compressor #1 unload solenoid is energized

through RO3.

.5 Compressor #1 oil and suction pressure rise tonormal levels, and 3PS-1 terminates the timeopen sequence.

1st stage capacity is now On-Line.

3.12.2.2 - STEP 2.6 Circuit 1 suction pressure rises above the

Suction Pressure setpoint plus Control Zone +setpoint and stage 1 has been on line for aninter-stage delay. Compressor #1 unloadsolenoid is de-energized to LOAD thecompressor.

2nd stage capacity is now On-Line.

3.12.2.3 - STEP 3.7 Building control system closes circuit 2 start

contact.

.8 Compressor #2 starts 100% loaded. Ampsensor 2CT indicates current flow. Themicrocomputer energizes liquid line solenoid 2and circuit 2 refrigerant flow starts. Oil failureswitch 3PS-2 starts to time open (120 sec.delay). Low pressure lockout starts to time open(120 sec. delay).

NOTE: If either oil pressure or suction pressureis not established at a normal level within theabove delay times, circuit 2 will shut down.

.9 Compressor #1 unload solenoid is energizedto unload the compressor.

.10 Compressor #2 oil and circuit #2 suctionpressures rise to normal levels, and 3PS-3terminates the time open sequence.

3rd stage capacity is now On-Line.

3.12.2.4 - STEP 4.11 Circuit 2 suction pressure rises above the

Suction Pressure setpoint plus Control Zone +setpoint and stage 3 has been on line for aninter-stage delay. Compressor #1 unloadsolenoid is de-energized to load the compressor.

100% capacity is now On-Line.

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3.0 OPERATION (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

3.12.3 Run cycle sequence (decreasingload)

3.12.3.1 - STEP 4.1 Circuit 2 suction pressure falls below the Suction

Pressure setpoint minus Control Zone - setpointand stage 4 has been on line for an inter-stagedelay. Compressor #1 unload solenoid isenergized to unload the compressor.

3rd stage capacity is now On-Line.

3.12.3.2 - STEP 3.2 Building control system opens Circuit 2 start

contact.

.3 When suction pressure drops to the pumpdowncutout setpoint, compressor #2 stops. Circuit#2 pumpdown and unload sequence is nowcomplete, and all circuit 2 controls are back tostandby status.

.4 Compressor #1 unload solenoid is de-energizedto load compressor #1 back to full capacity.

2nd stage capacity is now On-Line.

3.12.3.3 - STEP 2.5 Circuit 1 suction pressure falls below the Suction

Pressure setpoint minus Control Zone - setpointand stage 2 has been on line for an inter-stagedelay. Compressor #1 unload solenoid isenergized to unload the compressor.

1st stage capacity is now On-Line.

3.12.3.4 - STEP 1.6 Building control system opens Circuit 1 start

contact.

.7 When suction pressure drops to thepumpdown cutout setpoint, compressor #1stops. Circuit #1 pumpdown and unloadsequence is now complete, and all circuit 1controls are back to standby status.

Unit is off.

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4.0 MAINTENANCE ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

4.1 GeneralAs with all mechanical equipment, a program of regularinspection, cleaning and preventive maintenance by trainedpersonnel will contribute greatly to the long satisfactoryservice life of this product.

4.2 Periodic InspectionRead essential temperatures and pressures periodically to seethat they indicate normal operation. It is a good idea torecord these readings on a log sheet. See sample, Section4.10. If any abnormal operation is observed, try to determinecause and remedy it. See Troubleshooting Guide, Section4.9.

4.3 Monthly InspectionWipe down external surfaces of unit. Shut unit down, openmain disconnect, inspect control panel, checking for loosewires, burned contacts, signs of overheated wires, etc. Restartunit and check performance of controls. Check sight glassesfor proper refrigerant charge.

4.4 Vessel Maintenance

4.4.1 GeneralThe efficient performance of the cooler and condenser heattransfer surfaces is essential for efficient performance of yourpackaged water cooling machine. If these surfacesaccumulate a film of dirt, scale or slime, their performanceefficiency will degrade substantially. The refrigerant side ofheat transfer surfaces does not foul, since refrigerant is agood solvent and it is in a closed, filtered cycle. Water sidesurfaces can foul from the water system. A program of watertreatment can slow the rate of fouling on heat transfersurfaces, but not eliminate it.

4.4.2 Cooler Cleaning ACDR-B orSplit-System Chiller

The effects of fouling can be detected by recording full loadperformance data on the log sheet. If the difference betweenthe leaving water from the cooler and the saturated suctiontemperature at the compressor is greater than the differencerecorded at clean conditions, the tubes should be cleaned.It is generally advisable to clean the cooler water side surfacesat least annually, and more often if severely foul water isused. This cleaning must be done chemically.

In chemical cleaning, a caustic solution is pumped throughthe heat exchanger, which attacks dirt, slime and mineraldeposits and flushes them away. Chemicals can berecommended by water treatment specialists, but it isimportant to rinse the system thoroughly after cleaning toremove the chemicals before they attack the metal surfaces.The cooler water side (shell side) cannot be physically cleanedbecause of the cross-flow baffle construction.

4.5 Air Cooled CondenserCleaning ACDR-B/AUDR-B

The face of the condenser should be cleaned at least once amonth during operation. If conditions are bad the condenserspick up dirt very quickly, it is suggested that they be cleanedmore frequently. If the condenser is allowed to get too dirty,the unit will run a high head pressure and will not givesatisfactory performance.

Dirty coils can be cleaned using a soft brush or by flushingwith cool water or commerically available coil cleaners. DONOT USE HOT WATER OR STEAM. To do so will cause excessivepressure in the system. The face of the condenser should becleaned at the beginning of the season and periodicallythereafter if conditions require.

4.6 Electrical MalfunctionThe unit has four devices designed to protect compressormotors and motor controllers from electrical malfunction:customer supplied short circuit protection, circuit breakers(optional, if available), under voltage relays (optional), solidstate motor over temperature protectors, and microcomputerhigh amp protection.

If the undervoltage relay trips, it is a sign of trouble inincoming power. If it trips again after resetting, call yourelectric utility to investigate the problem. If circuit breakeror motor over temperature protectors trip, this is a sign ofpossible motor trouble. DO NOT reset and try to runcompressor again. Call authorized service representative tocheck for motor trouble. Resetting these safety devices andrepeated starting could turn a minor motor problem into acostly major motor burnout.

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4.0 MAINTENANCE (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

4.7 Compressor MaintenanceThe Discus compressor has four components that maybe replaced. The components are the suction strainer,oil pump, cylinder heads and valve plates.

If a component, other than that listed below, fails, thecompressor will require replacement. Return thecompressor to your local Copeland distributor forreplacement.

Compressor Bolt Torque SpecificationsAll Torques in ft.-lb.

DiscusBottom plate 33Housing cover 33Oil pump to housing cover 21Cylinder head 42-50Oil screen cover 50Crankcase heater plug 38Discharge valve 42Suction valve 1/2" 42Suction valve 5/8" 80Capacity control valve 35Pipe plug, 1/4" 23Pipe plug, 1/8" 17Oil sight glass 3

4.8 Refrigerant ChargeAll packaged chiller units are given a complete chargeof refrigerant at the factory. The type and amount ofrefrigerant required is in Physical Specifications. Thetotal refrigerant shown is for the entire system. Sincethese units have separate circuits, each circuit shouldbe considered separately for charging.

In order to check proper refrigerant charge, look in eachliquid line sight glass with the aid of a flashlight duringsystem operation. At all operating conditions, the sightglass should be clear. If bubbles are visible at anyoperating condition, the circuit is short of charge.

Be careful not to overcharge the machine. Overchargingwill result in considerable liquid logging in thecondenser, and excessive condensing pressure.

To add refrigerant, connect a refrigerant vessel to the1/4" backseating port of the suction valve. Purge theair from the tube with refrigerant gas before connecting.With the unit running, open the refrigerant vessel vaporconnection slightly. If the refrigerant vessel is warmerthan the cooler, refrigerant will more readily flow fromthe vessel into the unit.

To determine the proper refrigerant charge, check theamount of subcooling at design full load conditions, ifpossible. The amount of subcooling at the liquid line(liquid line saturation temperature corresponding toliquid line pressure minus liquid line temperature)should be between 15°F and 20°F.

Subcooling at the condenser out-subcooler inlet trapshould not exceed 5°F. This sight glass should be clearwith no bubbles.

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4.0 MAINTENANCE (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

4.9 Troubleshooting Guide

1. Power off.2. Main line open3. No control voltage4. Loose terminals5. Control circuit open

6. Incorrect phase sequence (UVR option)7. Microcomputer safety lockout

(if applicable)

1. Low voltage

2. No power on one phase of 3 phaseunit

3. Faulty starter or contactor

Check main disconnect switchCheck main fusesCheck control terminal block for 115VACTighten all terminalsCheck fuses, control switches and field installed interlocks, pressure andtemperature controls and readouts.

Reverse incoming power sequence

Resolve problem and press RESET

a. Check at main entrance and at unitb. Consult power company if voltage is low and increase wire size to

the unit if voltage is normal at main and low at unit. Voltage mustbe within 10% of motor nameplate rating.

Check fuses and wiring

Check the contacts and time delay on part wind start (if applicable)

4.9.2 Compressor hums but does not start

1. Refrigerant shortage Check for leaks and add refrigerant2. No load on chiller Check pump operation and water flow3. Restriction in liquid line a. Plugged filter drier. If temperature drop exists across the drier,

remove and replace cores.b. Liquid line or suction valve partially closed. Open valves fully and

close in one full turn.c. Expansion valve clogged or inoperative. Check superheat setting.

Check charge and thermo bulb.4. Head pressure too low Possible cause - fan cycle switches set too low. Remedy - check and

reset

1. Compressor discharge valve partially Open valve fully and close with one turnclosed

2. Air in system Purge condenser coils3. Overcharge of refrigerant Purge system while in operation until bubbles show in sight glass. Close

valve and add small amount of refrigerant until sight glass just clears4. High pressure control improperly set Adjust the control5. Condenser fan inoperative Check, replace or repair set screw (pulley), fan motor, or inoperative fan

control6. Dirty condenser Clean condenser surfaces with brush and/or vacuum7. Fan cycle settings incorrect Check and re-adjust8. Fan motors not running Check contactor, check motor, check capacitor (if single phase)9. Fan motor reverse rotation Reverse two fan motor leads (3 phase only)

4.9.1 Unit will not startPossible Causes Corrective Action

4.9.3 Compressor cycles on low pressure control

4.9.4 Compressor cycles on high pressure control

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4.0 MAINTENANCE (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

4.10 Sample Log Sheet

ACDR-B / AUDR-B 021S to 200DReciprocating Compressor Packaged Chiller or Condensing Unit

NAMEPLATE DATA:

UNIT MODEL NO. UNIT SERIAL NO.

UNIT ELECTRICAL DATA: VOLTS 3 PHASE HZ

COMPRESSOR MODEL NO. COMPRESSOR S.N.

COMPRESSOR MODEL NO. COMPRESSOR S.N.

COMPRESSOR MODEL NO. COMPRESSOR S.N.

START UP: DATE , TIME

REPORT DATE

REPORT TIME

ELAPSED TIME METER COMPRESSOR 1

ELAPSED TIME METER COMPRESSOR 2

ELAPSED TIME METER COMPRESSOR 3

COOLER WATER TEMPERATURE - IN

COOLER WATER TEMPERATURE - OUT

COOLER PRESSURE DROP PSI/IN WATER

COOLER WATER FLOW (GPM)

CONDENSER AIR TEMPERATURE - IN (AMBIENT)

ACTUAL VOLTAGE

FAN AMPS

VOLTS

*Use Table 4.11 For Obtaining Saturated Temperature

This log sheet is provided as a recommendation of the readings that should be taken on a periodic basis. The actual readingstaken and the frequency will depend upon the unit’s applications, hours of use, etc. This type of information can prove veryuseful in preventing and/or solving problems that might occur during the life of this unit.

Sheet No.

Page 1 of 2

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4.10 Sample Log Sheet

ACDR-B 160-270Reciprocating Compressor Packaged Chiller

Sheet No.

Page 2 of 2

COMPR.NO.1

SUCTION PRESSURE 2

3

1

DISCHARGE PRESSURE 2

3

1

DISCHARGE TEMPERATURE 2

3

1

SUCTION TEMPERATURE 2

3

1

DISCHARGE SUPERHEAT 2(DISCH. TEMP. — SAT. DISCH.)*

3

1

SUCTION SUPERHEAT 2(SUCT. TEMP. — SAT. SUCT.)*

3

1

COMPRESSOR AMPS 2

3

4.0 MAINTENANCE (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

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93

PRES TEMP PRES TEMP PRES TEMP PRES TEMP PRES TEMP PRES TEMP

0 -41.4 55 30.1 110 64.4 165 88.6 220 108.0 276 124.5 1 -38.8 56 30.9 111 64.9 166 89.0 221 108.3 278 125.1 2 -36.4 57 31.7 112 65.4 167 89.4 222 108.6 280 125.6 3 -34.1 58 32.4 113 65.9 168 89.8 223 109.0 282 126.1 4 -31.8 59 33.2 114 66.4 169 90.2 224 109.3 284 126.7 5 -29.7 60 33.9 115 66.9 170 90.6 225 109.6 286 127.2 6 -27.7 61 34.7 116 67.4 171 91.0 226 109.9 288 127.7 7 -25.7 62 35.4 117 67.9 172 91.3 227 110.2 290 128.3 8 -23.8 63 36.1 118 68.3 173 91.7 228 110.5 292 128.8 9 -22.0 64 36.9 119 68.8 174 92.1 229 110.8 294 129.310 -20.2 65 37.6 120 69.3 175 92.5 230 111.2 296 129.811 -18.5 66 38.3 121 69.8 176 92.8 231 111.5 298 130.312 -16.9 67 39.0 122 70.2 177 93.2 232 111.8 300 130.913 -15.3 68 39.7 123 70.7 178 93.6 233 112.1 302 131.414 -13.7 69 40.4 124 71.2 179 93.9 234 112.4 304 131.915 -12.2 70 41.0 125 71.7 180 94.3 235 112.7 306 132.416 -10.7 71 41.7 126 72.1 181 94.7 236 113.0 308 132.917 -9.2 72 42.4 127 72.6 182 95.0 237 113.3 310 133.418 -7.8 73 43.0 128 73.0 183 95.4 238 113.6 312 133.919 -6.4 74 43.7 129 73.5 184 95.8 239 113.9 314 134.420 -5.1 75 44.3 130 74.0 185 96.1 240 114.2 316 134.921 -3.8 76 45.0 131 74.4 186 96.5 241 114.5 318 135.422 -2.5 77 45.6 132 74.9 187 96.9 242 114.8 320 135.923 -1.2 78 46.3 133 75.3 188 97.2 243 115.1 322 136.424 0.0 79 46.9 134 75.8 189 97.6 244 115.4 324 136.825 1.2 80 47.5 135 76.2 190 97.9 245 115.7 326 137.326 2.4 81 48.1 136 76.6 191 98.3 246 116.0 328 137.827 3.6 82 48.7 137 77.1 192 98.6 247 116.3 330 138.328 4.8 83 49.4 138 77.5 193 99.0 248 116.6 332 138.829 5.9 84 50.0 139 78.0 194 99.3 249 116.9 334 139.230 7.0 85 50.6 140 78.4 195 99.7 250 117.2 336 139.731 8.1 86 51.2 141 78.8 196 100.0 251 117.5 338 140.232 9.2 87 51.7 142 79.3 197 100.4 252 117.8 340 140.733 10.2 88 52.3 143 79.7 198 100.7 253 118.1 342 141.134 11.3 89 52.9 144 80.1 199 101.1 254 118.3 344 141.635 12.3 90 53.5 145 80.5 200 101.4 255 118.6 346 142.136 13.3 91 54.1 146 81.0 201 101.7 256 118.9 348 142.537 14.3 92 54.6 147 81.4 202 102.1 257 119.2 350 143.038 15.3 93 55.2 148 81.8 203 102.4 258 119.5 352 143.439 16.2 94 55.8 149 82.2 204 102.8 259 119.8 354 143.940 17.2 95 56.3 150 82.6 205 103.1 260 120.1 356 144.341 18.1 96 56.9 151 83.0 206 103.4 261 120.3 358 144.842 19.1 97 57.5 152 83.4 207 103.8 262 120.6 360 145.243 20.0 98 58.0 153 83.9 208 104.1 263 120.9 362 143.744 20.9 99 58.6 154 84.3 209 104.4 264 121.2 364 146.145 21.8 100 59.1 155 84.7 210 104.8 265 121.5 366 146.646 22.6 101 59.7 156 85.1 211 105.1 266 121.8 368 147.047 23.5 102 60.3 157 85.5 212 105.4 267 122.0 370 147.548 24.4 103 90.8 158 85.9 213 105.7 268 122.3 372 147.949 25.2 104 61.3 159 86.3 214 106.1 269 122.6 374 148.350 26.1 105 61.8 160 86.7 215 106.4 270 122.9 376 148.851 26.9 106 62.4 161 87.1 216 106.7 271 123.1 378 149.252 27.7 107 62.9 162 87.5 217 107.0 272 123.4 380 149.653 28.5 108 63.4 163 87.9 218 107.4 273 123.754 29.3 109 63.9 164 88.3 219 107.7 274 124.0

4.11 Temperature Pressure Table

Refrigerant 22 Pressure/Temperature Properties (PSIG-F)

4.0 MAINTENANCE (CONT.) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

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