with puronr (r--410a) refrigerant installation …...1 549j single package rooftop heat pump sizes...
TRANSCRIPT
1
549JSINGLE PACKAGE ROOFTOPHEAT PUMPSIZES 07 -- 09 with PURONR (R--410A) REFRIGERANT
Installation Instructions
NOTE: Read the entire instruction manual before startingthe installation.
TABLE OF CONTENTSSAFETY CONSIDERATIONS 2. . . . . . . . . . . . . . . . . . . .
Rated Indoor Airflow (cfm) 3. . . . . . . . . . . . . . . . . . . . .
REFRIGERATION SYSTEM COMPONENTS 8. . . . . . .
INSTALLATION 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Jobsite Survey 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Step 1 -- Plan for Unit Location 10. . . . . . . . . . . . . . . . .
Roof Mount 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Step 2 -- Plan for Sequence of Unit Installation 10. . . . .
Curb--Mounted Installation 10. . . . . . . . . . . . . . . . . .
Pad--Mounted Installation 10. . . . . . . . . . . . . . . . . . .
Frame--Mounted Installation 10. . . . . . . . . . . . . . . . .
Step 3 -- Inspect Unit 10. . . . . . . . . . . . . . . . . . . . . . . . . .
Step 4 -- Provide Unit Support 10. . . . . . . . . . . . . . . . . .
Roof Curb Mount 10. . . . . . . . . . . . . . . . . . . . . . . . .
Slab Mount (Horizontal Units Only) 12. . . . . . . . . .
Alternate Unit Support(In Lieu of Curb or Slab Mount) 12. . . . . . . . . . . . .
Step 5 -- Field Fabricate Ductwork 12. . . . . . . . . . . . . . .
For Units with Accessory Electric Heaters 12. . . . .
Step 6 -- Rig and Place Unit 12. . . . . . . . . . . . . . . . . . . .
Positioning on Curb 13. . . . . . . . . . . . . . . . . . . . . . .
Step 7 -- Convert to Horizontal and ConnectDuctwork 13. . . . . . . . . . . . . . . . . . . . . . . . . . .
Step 8 -- Install Outside Air Hood 14. . . . . . . . . . . . . . .
Economizer and Two Position Damper HoodPackage Removal and Setup — Factory Option 14. .
Economizer Hood and Two--Position Hood 14. . . . .
Step 9 -- Install External Condensate Trapand Line 15. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Step 10 -- Make Electrical Connections 15. . . . . . . . . . .
Field Power Supply 15. . . . . . . . . . . . . . . . . . . . . . . .
Units with Factory--InstalledNon--Fused Disconnect 16. . . . . . . . . . . . . . . . . . . . .
Units Without Factory--InstalledNon--Fused Disconnect 17. . . . . . . . . . . . . . . . . . . . .
All Units 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Convenience Outlets 17. . . . . . . . . . . . . . . . . . . . . . .
Factory Option Thru--Base Connections 18. . . . . . .
Units Without Thru--Base Connections 19. . . . . . . .
All Units 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Field Control Wiring 19. . . . . . . . . . . . . . . . . . . . . . .
Thermostat 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Central Terminal Board 20. . . . . . . . . . . . . . . . . . . . . .
Commercial Defrost Control 20. . . . . . . . . . . . . . . . . .
Unit Without Thru--Base Connection Kit 22. . . . . . .
Heat Anticipator Settings 22. . . . . . . . . . . . . . . . . . .
Electric Heaters 22. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Single Point Boxes & Supplementary Fuses 23. . . .
Single Point Boxes without Fuses 23. . . . . . . . . . . .
Low--Voltage Control Connections 23. . . . . . . . . . . .
Variable Frequency Drive (VFD) 2--SpeedIndoor Fan Motor System (Factory--Installed) 23. . . .
EconoMi$erR X (Factory--Installed Option) 24. . . . . .
Product Description 24. . . . . . . . . . . . . . . . . . . . . . . .
System Components 24. . . . . . . . . . . . . . . . . . . . . . .
Specifications 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
W7220 Economizer Module 24. . . . . . . . . . . . . . . . .
Electrical 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inputs 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Outputs 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Environmental 25. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Economizer Module Wiring Details 25. . . . . . . . . . .
S--Bus Sensor Wiring 25. . . . . . . . . . . . . . . . . . . . . .
CO2 Sensor Wiring 26. . . . . . . . . . . . . . . . . . . . . . . .
Interface Overview 26. . . . . . . . . . . . . . . . . . . . . . . . . .
User Interface 26. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Keypad 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Menu Structure 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setup and Configuration 27. . . . . . . . . . . . . . . . . . . . .
Time--out and Screensaver 27. . . . . . . . . . . . . . . . . .
Sequence of Operation 33. . . . . . . . . . . . . . . . . . . . . . .
Enthalpy Settings 36. . . . . . . . . . . . . . . . . . . . . . . . . . .
Two--Speed Fan Operation 36. . . . . . . . . . . . . . . . . . . .
Checkout 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Up 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Initial Menu Display 37. . . . . . . . . . . . . . . . . . . . . . .
2
Power Loss (Outage or Brownout) 38. . . . . . . . . . . .
Status 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checkout Tests 38. . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 38. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Alarms 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clearing Alarms 38. . . . . . . . . . . . . . . . . . . . . . . . . .
2--Speed Indoor Fan Control System with VariableFrequency Drive (Factory--Installed Option) 38. . . . . . .
RTU Open Controller System 39. . . . . . . . . . . . . . . . .
Supply Air Temperature (SAT) Sensor 41. . . . . . . . .
Outdoor Air Temperature (OAT) Sensor 41. . . . . . .
EconoMi$erR 2 42. . . . . . . . . . . . . . . . . . . . . . . . . . .
Field Connections 42. . . . . . . . . . . . . . . . . . . . . . . . . .
Space Temperature (SPT) Sensors 42. . . . . . . . . . . .
Indoor Air Quality (CO2) Sensor 43. . . . . . . . . . . . .
Outdoor Air Quality Sensor 44. . . . . . . . . . . . . . . . .
Space Relative Humidity Sensor or Humidistat 44. .
Smoke Detector/Fire Shutdown (FSD) 44. . . . . . . . .
Connecting Discrete Inputs 44. . . . . . . . . . . . . . . . . .
Communication Wiring -- Protocols 45. . . . . . . . . . . .
General 45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Local Access 46. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RTU Open Controller Troubleshooting 46. . . . . . . .
Outdoor Air Enthalpy Control 47. . . . . . . . . . . . . . . . .
Differential Enthalpy Control 47. . . . . . . . . . . . . . . .
Return Air Enthalpy Sensor 47. . . . . . . . . . . . . . . . .
Smoke Detectors 48. . . . . . . . . . . . . . . . . . . . . . . . . . .
Additional Application Data 48. . . . . . . . . . . . . . . . .
Step 11 -- Adjust Factory--Installed Options 48. . . . . . . .
Step 12 -- Install Accessories 49. . . . . . . . . . . . . . . . . . .
Step 13 -- Check Belt Tension 49. . . . . . . . . . . . . . . . . . .
UNIT START--UP CHECKLIST 51. . . . . . . . . . . . . . . . . .
SAFETY CONSIDERATIONSImproper installation, adjustment, alteration, service,maintenance, or use can cause explosion, fire, electricalshock or other conditions which may cause personal injuryor property damage. Consult a qualified installer, serviceagency, or your distributor or branch for information orassistance. The qualified installer or agency must usefactory--authorized kits or accessories when modifying thisproduct. Refer to the individual instructions packaged withthe kits or accessories when installing.
Follow all safety codes. Wear safety glasses and workgloves. Use quenching cloths for brazing operations andhave a fire extinguisher available. Read these instructionsthoroughly and follow all warnings or cautions attached to
the unit. Consult local building codes and appropriatenational electrical codes (in USA, ANSI/NFPA70,National Electrical Code (NEC); in Canada, CSA C22.1)for special requirements.
It is important to recognize safety information. This is thesafety--alert symbol . When you see this symbol on theunit and in instructions or manuals, be alert to thepotential for personal injury.
Understand the signal words DANGER, WARNING,CAUTION, and NOTE. These words are used with thesafety--alert symbol. DANGER identifies the most serioushazards which will result in severe personal injury ordeath. WARNING signifies hazards which could result inpersonal injury or death. CAUTION is used to identifyunsafe practices, which may result in minor personalinjury or product and property damage. NOTE is used tohighlight suggestions which will result in enhancedinstallation, reliability, or operation.
ELECTRICAL SHOCK HAZARDFailure to follow this warning could cause personalinjury or death.
Before performing service or maintenance operationson unit, always turn off main power switch to unit andinstall lockout tag. Unit may have more than onepower switch.
! WARNING
UNIT OPERATION AND SAFETY HAZARDFailure to follow this warning could cause personalinjury, death and/or equipment damage.
Puronr (R--410A) refrigerant systems operate athigher pressures than standard R--22 systems. Do notuse R--22 service equipment or components on Puronrefrigerant equipment.
! WARNING
PERSONAL INJURY AND ENVIRONMENTALHAZARDFailure to follow this warning could cause personalinjury or death.
Relieve pressure and recover all refrigerant beforesystem repair or final unit disposal.
Wear safety glasses and gloves when handlingrefrigerants. Keep torches and other ignition sourcesaway from refrigerants and oils.
! WARNING
3
CUT HAZARDFailure to follow this caution may result in personalinjury.
Sheet metal parts may have sharp edges or burrs. Usecare and wear appropriate protective clothing, safetyglasses and gloves when handling parts and servicingheat pump units.
CAUTION! Rated Indoor Airflow (cfm)The table to the right lists the rated indoor airflow usedfor the AHRI efficiency rating for the units covered in thisdocument.
Model Number Full Load Airflow (cfm)
549J*07A 2400
549J*07D 2400
549J*08D 3000
549J*09D 3400
ModelJ - Puron® (R-410A) Refrigerant
Unit Type549 - High Efficiency Packaged Heat Pump with optional electric heat
Packaging & 2-Speed Indoor Fan MotorA = Standard Packaging, electro-mechanical controls that require W7212 EconoMi$er® IVB = LTL Packaging, electro-mechanical controls that require W7212 EconoMi$er IVC = Standard Packaging, electro-mechanical controls that require W7220 EconoMi$er XD = Standard Packaging and 2 speed indoor fan motorE = LTL Packaging and 2 speed indoor fan motorF = LTL Packaging, electro-mechanical controls that require W7220 EconoMi$er X
Cooling Tons07 - 6 tons08 - 7.5 tons09 - 8.5 tons
Heat Level(Field installed electric heaters available)000 = No Heat
Indoor Fan Options1 = Standard Static Option2 = Medium Static Option3 = High Static/ Option
Refrig. System/Gas Heat OptionsA = One-Stage cooling modelsD = Two-Stage cooling models
Coil Options (Outdoor - Indoor - Hail Guard)A = Al/Cu - Al/CuB = Precoat Al/Cu - Al/CuC = E-coat Al/Cu - Al/CuD = E-coat Al/Cu - E-coat Al/CuE = Cu/Cu - Al/CuF = Cu/Cu - Cu/CuM = Al/Cu -Al/Cu — Louvered Hail GuardN = Precoat Al/Cu - Al/Cu — Louvered Hail GuardP = E-coat Al/Cu - Al/Cu — Louvered Hail GuardQ = E-coat Al/Cu - E-coat Al/Cu — Louvered Hail GuardR = Cu/Cu - Al/Cu — Louvered Hail GuardS = Cu/Cu - Cu/Cu — Louvered Hail Guard
VoltageE = 460-3-60P = 208/230-3-60T = 575-3-60
Example:
Position:
5 4 9 J P 0 8 D 0 0 0 A 1 B 0 A A
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
Factory Installed Options0A = None NOTE: See the 549J Price Pages for a complete list of factory installed options.
Outdoor Air OptionsA = NoneB = Temperature Economizer, Barometric Relief, Standard Leak (W7212 or W7220)E = Temperature Economizer, Barometric Relief, Standard Leak w/CO2, (W7212 or W7220)H = Enthalpy Economizer, Barometric Relief, Standard Leak, (W7212 or W7220)L = Enthalpy Economizer,Barometric Relief, Standard Leak w/CO2, (W7212 or W7220)Q = Motorized 2 Position DamperU = Temperature Economizer, Barometric Relief, Ultra Low Leak, (W7220)W = Enthalpy Economizer, Barometric Relief, Ultra Low Leak, (W7220)
a549J---007
Fig. 1 -- 549J 07--09 Model Number Nomenclature (Example)
4
C160144
Fig. 2 -- Unit Dimensional Drawing: 07 — 08 Size Units
5
C160145
Fig. 2 -- Unit Dimensional Drawing: 07 — 08 Size Units (cont.)
6
C10757A
Fig. 3 -- Unit Dimensional Drawing: 09 Size Units
7
C10758A
Fig. 3 -- Unit Dimensional Drawing: 09 Size Unit (cont.)
8
C
D
AB
C11247
LOCATION DIMENSION CONDITION
A
48--- in. (1219 mm)18--- in. (457 mm)18--- in. (457) mm12--- in. (305 mm)
Unit disconnect is mounted on panelNo disconnect, convenience outlet optionRecommended service clearanceMinimum clearance
B42--- in. (1067 mm)36--- in. (914 mm)Special
Surface behind servicer is grounded (e.g., metal, masonry wall)Surface behind servicer is electrically non---conductive (e.g., wood, fiberglass)Check sources of flue products within 10--- ft of unit fresh air intake hood
C36--- in. (914 mm)18--- in. (457 mm)
Side condensate drain is usedMinimum clearance
D42--- in. (1067 mm)36--- in. (914 mm)
Surface behind servicer is grounded (e.g., metal, masonry wall, another unit)Surface behind servicer is electrically non---conductive (e.g., wood, fiberglass)
NOTE: Unit not designed to have overhead obstruction. Contact Application Engineering for guidance on any applicationplanning overhead obstruction or for vertical clearances.
Fig. 4 -- Service Clearance Dimensional Drawing
REFRIGERATION SYSTEMCOMPONENTS
Each heat pump refrigeration system includes acompressor, accumulator, reversing valve, dual--functionoutdoor coil with vapor header check valve, cooling liquidline with a filter drier and a check valve, dual--functionindoor coil with a vapor header check valve, and heatingliquid line with check a valve and a strainer. Size 07 unitshave a single compressor--circuit; unit sizes 08 through 09have two compressor--circuits. See Fig. 5 for typical unitpiping schematic (unit size 09 (4--row indoor coil) withtwo compressor--circuits is shown).
Dual--function outdoor and indoor coils are designed toprovide parallel coil circuits during evaporator--functionoperation and converging coil circuits during thecondenser--function operation.
Reversing Valve and Check Valve Position
See Fig. 5 (on page 9) and Tables 1, 2, and 3.
Troubleshooting Refrigerant Pressure Problems andCheck Valves
Refer to Fig. 5 and the Cooling Mode and Heating Modetables (Tables 1 and 2).
Refrigerant System Pressure Access Ports
There are two access ports in each circuit -- on the suctiontube and the discharge tube near the compressor. These arebrass fittings with black plastic caps. The hose connectionfittings are standard 1/4--in. SAE male flare couplings.
The brass fittings are two--piece High Flow valves, with areceptacle base brazed to the tubing and an integralspring--closed check valve core screwed into the base. SeeFig. 6 on page 9. This check valve is permanentlyassembled into this core body and cannot be servicedseparately. Replace the entire core body if necessary.Service tools are available from RCD that allow thereplacement of the check valve core without having torecover the entire system refrigerant charge. Applycompressor refrigerant oil to the check valve core’sbottom O--ring. Install the fitting body and torque to96 10 in--lbs (10.9 1 Nm). Do not exceed 106 in--lbs(11.9 Nm) when tightening.
Table 1 – Cooling Mode (each circuit)
Component Status/PositionReversing Valve EnergizedCheck Valve A ClosedCheck Valve B OpenCheck Valve C ClosedCheck Valve D Open
9
Table 2 – Heating Mode (each circuit)
Component Status/PositionReversing Valve De---energizedCheck Valve A OpenCheck Valve B ClosedCheck Valve C OpenCheck Valve D Closed
Table 3 – Defrost Mode
Component Status/PositionDefrost Thermostat ClosedOutdoor Fan(s) OffReversing Valve EnergizedCheck Valve A ClosedCheck Valve B OpenCheck Valve C ClosedCheck Valve D Open
CO
MP
RE
SS
OR
AC
CU
MU
LATO
R
HPS
CO
MP
RE
SS
OR
AC
CU
MU
LATO
R
HPS
FilterDrier 2B
1B
LPS/LOC
Acutrol DFT 1
Cooling Liquid Lines
DFT 2
2A
1A
1D
2D
Outdoor Coil
Indoor Coil
Comp 2
Comp 1
2C
1C Strainer
Heating Mode Liquid Lines
Acutrol
ReversingValve
ReversingValve
C09228
Fig. 5 -- Typical Unit Piping Schematic (with TXV valves on Indoor Coils)
5/8” HEX 0.47
30°
0.596
1/2-20 UNF RH
1/2” HEX
45°
WASHERO-RING
7/16-20 UNF RH
DEPRESSOR PER AHRI 720+.01/-.035FROM FACE OF BODY
This surface provides a metal to metal seal whentorqued into the seat. Appropriate handling isrequired to not scratch or dent the surface.
SEAT CORE(Part No. EC39EZ067)
a548J---009
Fig. 6 -- CoreMax* Access Port Assembly
* CoreMax is a registered trademark of Fastest, Inc.
10
INSTALLATIONJobsite Survey
Complete the following checks before installation.
1. Consult local building codes and the NEC (NationalElectrical Code) ANSI/NFPA 70 for special installa-tion requirements.
2. Determine unit location (from project plans) or selectunit location.
3. Check for possible overhead obstructions which mayinterfere with unit lifting or rigging.
Step 1 — Plan for Unit Location
Select a location for the unit and its support system (curbor other) that provides for the minimum clearancesrequired for safety. This includes the clearance tocombustible surfaces, unit performance and service accessbelow, around and above unit as specified in unitdrawings. See Fig. 4.
NOTE: Consider also the effect of adjacent units.
Unit may be installed directly on wood flooring or on ClassA, B, or C roof--covering material when roof curb is used.
Do not install unit in an indoor location. Do not locate airinlets near exhaust vents or other sources of contaminatedair.
Although unit is weatherproof, avoid locations that permitwater from higher level runoff and overhangs to fall ontothe unit.
Select a unit mounting system that provides adequateheight to allow for removal and disposal of frost and icethat will form during the heating--defrost mode as well asallow installation of condensate trap per requirements.Refer to Step 9 — Install External Condensate Trap andLine – for required trap dimensions.
Roof Mount —
Check building codes for weight distributionrequirements. Unit operating weight is shown in Table 4.
Table 4 – Operating Weights
549J*UNITS LB (KG)
07 08 09
Base Unit 710 (322) 875 (397) 1020 (463)
Economizer
Vertical 80 (36) 80 (36) 80 (36)
Horizontal 105 (48) 105 (48) 105 (48)
Powered Outlet 32 (15) 32 (15) 32 (15)
Curb
14---in. / 356mm 110 (50) 110 (50) 110 (50)
24---in. / 610mm 145 (66) 145 (66) 145 (66)
Step 2 — Plan for Sequence of Unit Installation
The support method used for this unit will dictate differentsequences for the steps of unit installation. For example,on curb--mounted units, some accessories must beinstalled on the unit before the unit is placed on the curb.
Review the following for recommended sequences forinstallation steps.
Curb--Mounted Installation —
Install curbInstall field--fabricated ductwork inside curbInstall accessory thru--base service connection package(affects curb and unit) (refer to accessory installationinstructions for details)Prepare bottom condensate drain connection to suitplanned condensate line routing (refer to Step 9 fordetails)Rig and place unitInstall outdoor air hoodInstall condensate line trap and pipingMake electrical connectionsInstall other accessories
Pad--Mounted Installation —
Prepare pad and unit supportsCheck and tighten the bottom condensate drainconnection plugRig and place unitConvert unit to side duct connection arrangementInstall field--fabricated ductwork at unit duct openingsInstall outdoor air hoodInstall condensate line trap and pipingMake electrical connectionsInstall other accessories
Frame--Mounted Installation —
Frame--mounted applications generally follow thesequence for a curb installation. Adapt as required tosuit specific installation plan.
Step 3 — Inspect unit
Inspect unit for transportation damage. File any claimwith transportation agency.
Confirm before installation of unit that voltage, amperageand circuit protection requirements listed on unit dataplate agree with power supply provided.
On units with hinged panel option, check to be sure alllatches are snug and in closed position.
Locate the carton containing the outside air hood parts;see Fig. 12 (on page 14). Do not remove carton until unithas been rigged and located in final position.
Step 4 — Provide Unit Support
Roof Curb Mount —
Accessory roof curb details and dimensions are shown inFig. 7. Assemble and install accessory roof curb inaccordance with instructions shipped with the curb.
NOTE: The gasketing of the unit to the roof curb iscritical for a watertight seal. Install gasket supplied withthe roof curb as shown in Fig. 7. Improperly appliedgasket can also result in air leaks and poor unitperformance.
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C13311
Fig. 7 -- Roof Curb Details
12
Curb should be level. This is necessary for unit drain tofunction properly. Unit leveling tolerances are shown inFig. 8. Refer to Accessory Roof Curb InstallationInstructions for additional information as required.
A-B0.5″ (13)
B-C1.0″ (25)
A-C1.0″ (25)
MAXIMUM ALLOWABLEDIFFERENCE IN. (MM)
a50---9658
Fig. 8 -- Unit Leveling Tolerances
Install insulation, cant strips, roofing felt, and counterflashing as shown. Ductwork must be attached to curb andnot to the unit. The accessory thru--the--base power packagemust be installed before the unit is set on the roof curb.
If electric and control wiring is to be routed through thebasepan, attach the accessory thru--the--base serviceconnections to the basepan in accordance with theaccessory installation instructions.
Slab Mount (Horizontal Units Only) —
Provide a level concrete slab that extends a minimum of6 in. (150 mm) beyond unit cabinet. Install a gravel apronin front of condenser coil air inlet to prevent grass andfoliage from obstructing airflow.
NOTE: Horizontal units may be installed on a roof curbif required.
Alternate Unit Support (In Lieu of Curb or SlabMount) —
A non--combustible sleeper rail can be used in the unit curbsupport area. If sleeper rails cannot be used, support the longsides of the unit with a minimum of 3 equally spaced 4--in. x4--in. (102 mm x 102 mm) pads on each side.
Step 5 — Field Fabricate Ductwork
Cabinet return-air static pressure (a negative condition)shall not exceed 0.35 in. wg (87 Pa) with economizer or0.45 in. wg (112 Pa) without economizer.
For vertical ducted applications, secure all ducts to roof curband building structure. Do not connect ductwork to unit.
Fabricate supply ductwork so that the cross sectionaldimensions are equal to or greater than the unit supplyduct opening dimensions for the first 18 in. (458 mm) ofduct length from the unit basepan.
Insulate and weatherproof all external ductwork, joints,and roof openings with counter flashing and mastic inaccordance with applicable codes.
Ducts passing through unconditioned spaces must beinsulated and covered with a vapor barrier.
If a plenum return is used on a vertical unit, the returnshould be ducted through the roof deck to comply withapplicable fire codes.
PROPERTY DAMAGE HAZARDFailure to follow this caution may result in damageto roofing materials.
Membrane roofs can be cut by sharp sheet metaledges. Be careful when placing any sheet metal partson such roof.
CAUTION!
For Units with Accessory Electric Heaters —
All installations require a minimum clearance tocombustible surfaces of 1--in. (25 mm) from duct for first12--in. (305 mm) away from unit.
Outlet grilles must not lie directly below unit discharge.
NOTE: A 90--degree elbow must be provided in theductwork to comply with UL (Underwriters Laboratories)code for use with electric heat.
PERSONAL INJURY HAZARDFailure to follow this warning could cause personalinjury.
For vertical supply and return units, tools or parts coulddrop into ductwork and cause an injury. Install a90--degree turn in the return ductwork between the unitand the conditioned space. If a 90--degree elbow cannotbe installed, then a grille of sufficient strength anddensity should be installed to prevent objects fromfalling into the conditioned space. Due to electricheater, supply duct will require 90--degree elbow.
! WARNING
Step 6 — Rig and Place Unit
UNIT DAMAGE HAZARDFailure to follow this caution may result inequipment damage.
All panels must be in place when rigging. Unit is notdesigned for handling by fork truck.
CAUTION!
Keep unit upright and do not drop. Spreader bars are notrequired if top crating is left on unit. Rollers may be used tomove unit across a roof. Level by using unit frame as areference. See Table 4 and Fig. 9 for additional information.
Lifting holes are provided in base rails as shown in Fig. 9.Refer to rigging instructions on unit.
Rigging materials under unit (cardboard to prevent basepan damage) must be removed PRIOR to placing the uniton the roof curb.
13
DETAIL “A”
PLACE ALL SEAL STRIP IN PLACEBEFORE PLACING UNIT ON ROOF CURB.
DUCT END
SEE DETAIL “A”
“C”
“B”
“A”
914-1371(36"-54")SPREADER
BARS
REQUIRED
C10410
UNITMAX WEIGHT
DIMENSIONSA B C
LB KG IN. MM IN. MM IN. MM549J*07A/D 1100 500 88.0 2235 40.8 1035 41.5 1055549J*08D 1315 598 88.0 2235 41.6 1057 49.5 1257549J*09D 1505 684 88.0 2235 40.0 1015 49.5 1257
NOTES:1. Dimensions in ( ) are millimeters.2. Hook rigging shackles through holes in base rail, as shown in detail “A.” Holes in base rails are centeredaround the unit center of gravity. Use wooden top to prevent rigging straps from damaging unit.
Fig. 9 -- Rigging Details
When using the standard side drain connection, ensure thered plug in the alternate bottom connection is tight. Dothis before setting the unit in place. The red drain panplug can be tightened with a 1/2--in. square socket driveextension. For further details see “Step 9 -- Install ExternalCondensate Trap and Line” on page 15.
Before setting the unit onto the curb, recheck gasketing oncurb.
Positioning on Curb —
Position unit on roof curb so that the following clearancesare maintained: 1/4 in. (6.4 mm) clearance between theroof curb and the base rail inside the front and rear, 0.0 in.clearance between the roof curb and the base rail inside onthe duct end of the unit. This will result in the distancebetween the roof curb and the base rail inside on thecondenser end of the unit being approximately 1/4 in.(6.4 mm).
Although unit is weatherproof, guard against water fromhigher level runoff and overhangs.
For size 08 and 09 units: after unit is in position, removethe compressor access panel. Holding the blockingbetween compressors with one hand, cut the strapping.Carefully remove the blocking without damaging tubing,wiring, or controls. Remove the strapping and replace theaccess panel.
Remove all shipping materials and top skid. Recycle ordispose of all shipping materials.
Step 7 — Convert to Horizontal and ConnectDuctwork (when required)
Unit is shipped in the vertical duct configuration. Unit
without factory--installed economizer or return air smokedetector option may be field--converted to horizontal ductedconfiguration. To convert to horizontal configuration,remove screws from side duct opening covers and removecovers. Using the same screws, install covers on verticalduct openings with the insulation--side down. Seals aroundduct openings must be tight. See Fig. 10.
C06108
Fig. 10 -- Horizontal Conversion Panels
Field--supplied flanges should be attached to horizontalduct openings and all ductwork should be secured to theflanges. Insulate and weatherproof all external ductwork,joints, and roof or building openings with counter flashingand mastic in accordance with applicable codes.
Do not cover or obscure visibility to the unit’s informativedata plate when insulating horizontal ductwork.
14
Step 8 — Install Outside Air Hood
Economizer and Two Position Damper HoodPackage Removal and Setup -- Factory Option
1. The hood is shipped in knock--down form and must befield assembled. The indoor coil access panel is used asthe hood top while the hood sides, divider and filter arepackaged together, attached to a metal support tray us-ing plastic stretch wrap, and shipped in the return aircompartment behind the indoor coil access panel. Thehood assembly’s metal tray is attached to the basepanand also attached to the damper using two plastic tie--wraps.
2. To gain access to the hood, remove the filter accesspanel. (See Fig. 11.)
FILTER ACCESS PANEL
OUTDOOR-AIR OPENING ANDINDOOR COIL ACCESS PANEL
COMPRESSORACCESS PANEL
C06023Fig. 11 -- Typical Access Panel Locations
3. Locate the (2) screws holding the metal tray to thebasepan and remove. Locate and cut the (2) plastictie--wraps securing the assembly to the damper. (SeeFig. 12.) Be careful to not damage any wiring or cuttie--wraps securing any wiring.
Hood Parts
Plastic Tie WrapQty (2)
Screws for Metal TrayQty (2)
C08639
Fig. 12 -- Economizer and Two--Position DamperHood Parts Location
4. Carefully lift the hood assembly (with metal tray)through the filter access opening and assemble per thesteps outlined in Economizer Hood and Two–PositionHood.
Economizer Hood and Two--Position Hood —
NOTE: If the power exhaust accessory is to be installedon the unit, the hood shipped with the unit will not beused and must be discarded. Save the aluminum filter foruse in the power exhaust hood assembly.1. The indoor coil access panel will be used as the top ofthe hood. Remove the screws along the sides and bot-tom of the indoor coil access panel. See Fig. 13.
TOPPANEL
INDOORCOILACCESSPANEL
INDOORCOILACCESSPANEL
CAULKHERE
TOPPANEL
C06025Fig. 13 -- Indoor Coil Access Panel Relocation
2. Swing out indoor coil access panel and insert the hoodsides under the panel (hood top). Use the screwsprovided to attach the hood sides to the hood top. Usescrews provided to attach the hood sides to the unit. SeeFig. 14.
B
TOPPANEL
INDOOR COILACCESS PANEL
19 1/16″SCREW
HOOD DIVIDER
LEFTHOODSIDE
33 3/8″(848mm)
(483mm)
a50---9659Fig. 14 -- Economizer Hood Construction
3. Remove the shipping tape holding the economizerbarometric relief damper in place (economizer only).
4. Insert the hood divider between the hood sides. SeeFig. 14 and Fig. 15. Secure hood divider with 2screws on each hood side. The hood divider is alsoused as the bottom filter rack for the aluminum filter.
15
5. Open the filter clips which are located underneath thehood top. Insert the aluminum filter into the bottomfilter rack (hood divider). Push the filter into positionpast the open filter clips. Close the filter clips to lockthe filter into place. See Fig. 15.
6. Caulk the ends of the joint between the unit top paneland the hood top.
7. Replace the filter access panel.
DIVIDER
BAROMETRICRELIEF
CLEANABLEALUMINUMFILTER
FILTER
HOOD
FILTERCLIP
OUTSIDEAIR
C08634Fig. 15 -- Economizer Filter Installation
Step 9 — Install External Condensate Trapand Line
The unit has one 3/4-in. condensate drain connection onthe end of the condensate pan and an alternate connectionon the bottom. See Fig. 16. Unit airflow configurationdoes not determine which drain connection to use. Eitherdrain connection can be used with vertical or horizontalapplications.
To use the alternate bottom drain connection, remove thered drain plug from the bottom connection (use a 1/2--in.square socket drive extension) and install it in the sidedrain connection.
DRAIN(FACTORY-INSTALLED)
PLUG
CONDENSATE PAN (SIDE VIEW)
STANDARDSIDE DRAIN
ALTERNATEBOTTOM DRAIN
C08021
Fig. 16 -- Condensate Drain Pan (Side View)
The piping for the condensate drain and external trap canbe completed after the unit is in place. See Fig. 17.
NOTE: Trap should be deep enough to offset maximum unit static difference. A 4 in. (102 mm) trap is recommended.
MINIMUM PITCH1” (25mm) PER10’ (3m) OF LINE
BASE RAIL
OPENVENT
TO ROOFDRAIN
DRAIN PLUG
ROOFCURB
SEE NOTE
3˝(76mm)MIN
a50---9660
Fig. 17 -- Condensate Drain Piping Details
All units must have an external trap for condensatedrainage. Install a trap at least 4-in. (102 mm) deep andprotect against freeze-up. If drain line is installeddownstream from the external trap, pitch the line awayfrom the unit at 1-in. per 10 ft (25 mm in 3 m) of run. Donot use a pipe size smaller than the unit connection(3/4-in.).
Step 10 — Make Electrical Connections
ELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personalinjury or death.
Do not use gas piping as an electrical ground. Unitcabinet must have an uninterrupted, unbrokenelectrical ground to minimize the possibility ofpersonal injury if an electrical fault should occur. Thisground may consist of electrical wire connected tounit ground lug in control compartment, or conduitapproved for electrical ground when installed inaccordance with NEC (National Electrical Code);ANSI/NFPA 70, latest edition (in Canada, CanadianElectrical Code CSA [Canadian StandardsAssociation] C22.1), and local electrical codes.
! WARNING
NOTE: Check all factory and field electrical connectionsfor tightness. Field--supplied wiring shall conform withthe limitations of 63_F (33_C) rise.
Field Power Supply —
If equipped with optional Powered Convenience Outlet:The power source leads to the convenience outlet’stransformer primary are not factory connected. Installermust connect these leads according to required operationof the convenience outlet. If an always--energizedconvenience outlet operation is desired, connect thesource leads to the line side of the unit--mounteddisconnect. (Check with local codes to ensure this methodis acceptable in your area.) If a de--energize via unitdisconnect switch operation of the convenience outlet isdesired, connect the source leads to the load side of the
16
unit disconnect. On a unit without a unit--mounteddisconnect, connect the source leads to compressorcontactor C and indoor fan contactor IFC pressure lugswith unit field power leads.
Field power wires are connected to the unit at line--sidepressure lugs on compressor contactor C and indoor fancontactor IFC or terminal board (see wiring diagram labelfor control box component arrangement) or atfactory--installed option non--fused disconnect switch.Max wire size is #2 AWG (copper only). (See Fig. 18.)
NOTE: TEST LEADS -- Unit may be equipped withshort leads (pigtails) on the field line connection points oncontactor C or optional disconnect switch. These leads arefor factory run--test purposes only; remove and discardbefore connecting field power wires to unit connectionpoints. Make field power connections directly to lineconnection pressure lugs only.
Units Without Disconnect Option
Units With Disconnect Option
2
4
6
1
3
5
L1
L2
L3
OptionalDisconnect
Switch
Disconnect factory test leads; discard.
FactoryWiring
11 13 13
L1 L2 L3
TB
C
IFC(3 Phase
Indoor Motor)
(1 Phase Indoor Motorand 1 Phase Unit)
208/230-3-60460-3-60575-3-60
Disconnectper
NEC
C10468
Fig. 18 -- Power Wiring Connections
! WARNINGFIRE HAZARD
Failure to follow this warning could result inpersonal injury, death, or property damage.
Do not connect aluminum wire between disconnectswitch and furnace. Use only copper wire.(See Fig. 19.)
COPPER
WIRE ONLY
ELECTRICDISCONNECT
SWITCH
ALUMINUMWIRE
A93033
Fig. 19 -- Disconnect Switch and Unit
Units with Factory--Installed Non--Fused Disconnect —
The factory--installed option non--fused disconnect (NFD)switch is located in a weatherproof enclosure locatedunder the main control box. The manual switch handle andshaft are shipped in the disconnect enclosure. Assemble theshaft and handle to the switch at this point. Discard thefactory test leads (see Fig. 18).
Connect field power supply conductors to LINE sideterminals when the switch enclosure cover is removed toattach the handle.
C12284
Fig. 20 -- Location of Non--Fused Disconnect Enclosure
To field install the NFD shaft and handle:
1. Remove the unit front panel (see Fig. 2 or Fig. 3).2. Remove (3) hex screws on the NFD enclosure -- (2) onthe face of the cover and (1) on the left side cover. SeeFig. 21.
3. Remove the front cover of the NFD enclosure.4. Make sure the NFD shipped from the factory is atOFF position (the arrow on the black handle knob isat OFF).
5. Insert the shaft with the cross pin on the top of the shaftin the horizontal position.
6. Measure from the tip of the shaft to the top surface ofthe black pointer; the measurement should be 3.75 to3.88 in. (95 to 99 mm).
7. Tighten the locking screw to secure the shaft to theNFD.
8. Turn the handle to the OFF position with red arrowpointing at OFF.
9. Install the handle on to the painted cover horizontallywith the red arrow pointing to the left.
17
10. Secure the handle to the painted cover with (2) screwsand lock washers supplied.
11. Engaging the shaft into the handle socket, re--install(3) hex screws on the NFD enclosure.
12. Re--install the unit front panel.
C12279
Fig. 21 -- Handle and Shaft Assembly for NFD
Units Without Factory--InstalledNon--Fused Disconnect —
When installing units, provide a disconnect switch perNEC (National Electrical Code) of adequate size.Disconnect sizing data is provided on the unit informativeplate. Locate on unit cabinet or within sight of the unit pernational or local codes. Do not cover unit informativeplate if mounting the disconnect on the unit cabinet.
All Units --
All field wiring must comply with NEC and all local codes.Size wire based on MCA (Minimum Circuit Amps) on theunit informative plate. See Fig. 18 and the unit labeldiagram for power wiring connections to the unit powerterminal blocks and equipment ground. Maximum wire sizeis #2 ga AWG (copper only) per pole on contactors.
Provide a ground--fault and short--circuit over--currentprotection device (fuse or breaker) per NEC Article 440(or local codes). Refer to unit informative data plate forMOCP (Maximum Over--current Protection) device size.
All field wiring must comply with the NEC and localrequirements.
All units except 208/230-v units are factory wired for thevoltage shown on the nameplate. If the 208/230-v unit isto be connected to a 208-v power supply, the controltransformer must be rewired by moving the black wirewith the 1/4-in. female spade connector from the 230--vconnection and moving it to the 208-v 1/4-in. maleterminal on the primary side of the transformer. Refer tounit label diagram for additional information. Field powerwires will be connected line--side pressure lugs on thepower terminal block or at factory--installed optionnon--fused disconnect.
NOTE: Check all factory and field electrical connectionsfor tightness.
Convenience Outlets —
ELECTRICAL OPERATION HAZARDFailure to follow this warning could result in personalinjury or death.
Units with convenience outlet circuits may usemultiple disconnects. Check convenience outlet forpower status before opening unit for service. Locateits disconnect switch, if appropriate, and open it.Lock--out and tag--out this switch, if necessary.
! WARNING
Two types of convenience outlets are offered asfactory--installed options on 549J models: Non--poweredand unit--powered. Both types provide a 125--volt GFCI(ground--fault circuit--interrupter) duplex receptacle rated at15--A behind a hinged waterproof access cover, located onthe end panel of the unit. See Fig. 22.
A 20 amp non--powered convenience outlet is available asa field--installed accessory.
ConvenienceOutletGFCI
Pwd-COFuse Switch
Pwd-COTransformer
Control BoxAccess Panel
C08128
Fig. 22 -- Convenience Outlet Location
Installing Weatherproof Cover: A weatherproofwhile-in-use cover for the factory-installed convenienceoutlets is now required by UL standards. This cover cannotbe factory-mounted due its depth; it must be installed at unitinstallation. For shipment, the convenience outlet is coveredwith a blank cover plate.
The weatherproof cover kit is shipped in the unit’s controlbox. The kit includes the hinged cover, a backing plateand gasket.
DISCONNECT ALL POWER TO UNIT ANDCONVENIENCE OUTLET. LOCK--OUT AND TAG--OUTALL POWER.
Remove the blank cover plate at the convenience outlet;discard the blank cover.
Loosen the two screws at the GFCI duplex outlet, untilapproximately 1/2-in. (13 mm) under screw heads areexposed. Press the gasket over the screw heads. Slip thebacking plate over the screw heads at the keyhole slotsand align with the gasket; tighten the two screws untilsnug (do not over-tighten).
18
Mount the weatherproof cover to the backing plate asshown in Fig. 23. Remove two slot fillers in the bottom ofthe cover to permit service tool cords to exit the cover.Check for full closing and latching.
RECEPTACLENOT INCLUDED
COVER – WHILE-IN-USE WEATHERPROOF
BASE PLATE FOR GFCI RECEPTACLE
C09022
Fig. 23 -- Weatherproof Cover Installation
Non--powered type: This type requires the fieldinstallation of a general--purpose 125--volt 15--A circuitpowered from a source elsewhere in the building. Observenational and local codes when selecting wire size, fuse orbreaker requirements and disconnect switch size andlocation. Route 125--v power supply conductors into thebottom of the utility box containing the duplex receptacle.
Unit--powered type: A unit--mounted transformer isfactory--installed to stepdown the main power supplyvoltage to the unit to 115--v at the duplex receptacle. Thisoption also includes a manual switch with fuse, located ina utility box and mounted on a bracket behind theconvenience outlet; access is through the unit’s controlbox access panel. See Fig. 22.
The primary leads to the convenience outlet transformer arenot factory--connected. Selection of primary power source isa customer--option. If local codes permit, the transformerprimary leads can be connected at the line--side terminals onthe unit--mounted non--fused disconnect or HACR breakerswitch; this will provide service power to the unit when theunit disconnect switch or HACR switch is open. Otherconnection methods will result in the convenience outletcircuit being de--energized when the unit disconnect orHACR switch is open. See Fig. 24.
Using unit--mounted convenience outlets: Units withunit--mounded convenience outlet circuits will oftenrequire that two disconnects be opened to de--energize allpower to the unit. Treat all units as electrically energizeduntil the convenience outlet power is also checked andde--energization is confirmed. Observe National ElectricalCode Article 210, Branch Circuits, for use of convenienceoutlets.
C08283
UNITVOLTAGE
CONNECTAS
PRIMARYCONNECTIONS
TRANSFORMERTERMINALS
208,230 240 L1: RED +YEL
L2: BLU + GRAH1 + H3H2 + H4
460 480L1: REDSplice BLU + YELL2: GRA
H1H2 + H3H4
575 600 L1: REDL2: GRA
H1H2
Fig. 24 -- Powered Convenience Outlet Wiring
a549J---006
Fig. 25 -- Convenience Outlet Utilization Notice Label
Test the GFCI receptacle by pressing the TEST button onthe face of the receptacle to trip and open the receptacle.Check for proper grounding wires and power line phasingif the GFCI receptacle does not trip as required. Press theRESET button to clear the tripped condition.
Factory Option Thru--Base Connections —
This service connection kit consists of a 1/2--in. electricalbulkhead connector and a 3/4--in. electrical bulkheadconnector, all factory--installed in the embossed (raised)section of the unit basepan in the condenser section. The1/2--in. bulkhead connector enables the low--voltagecontrol wires to pass through the basepan. The 3/4--in.electrical bulkhead connector allows the high--voltagepower wires to pass through the basepan. See Fig. 26.
19
LOW VOLTAGECONDUITCONNECTOR
HIGH VOLTAGECONDUITCONNECTOR
C13412
Fig. 26 -- Thru--Base Connection Fittings
Check tightness of connector lock nuts before connectingelectrical conduits.
Field--supplied and field--installed liquid tight conduitconnectors and conduit may be attached to the connectorson the basepan. Pull correctly rated high voltage and lowvoltage through appropriate conduits. Connect the powerconduit to the internal disconnect (if unit is so equipped)or to the external disconnect (through unit side panel). Ahole must be field cut in the main control box bottom onthe left side so the 24--v control connections can be made.Connect the control power conduit to the unit control boxat this hole.
Units without Thru--Base Connections —
1. Install power wiring conduit through side panel open-ings. Install conduit between disconnect and controlbox.
2. Install power lines to terminal connections as shownin Fig. 18.
All Units —
Voltage to compressor terminals during operation must bewithin voltage range indicated on unit nameplate. On3--phase units, voltages between phases must be balancedwithin 2% and the current within 10%. Use the formulabelow to determine the percent of voltage imbalance.
% VoltageImbalance = 100 x
max voltage deviation from average voltage
average voltage
Example: Supply voltage is 230-3-60
AB = 224 vBC = 231 vAC = 226 v
Average Voltage =(224 + 231 + 226)
=681
= 2273 3
Determine maximum deviation from average voltage.(AB) 227 – 224 = 3 v(BC) 231 – 227 = 4 v(AC) 227 – 226 = 1 vMaximum deviation is 4 v.Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x4
= 1.76%227
This amount of phase imbalance is satisfactory as it is below themaximum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is more than2%, contact your local electric utility company immediately.
Operation on improper line voltage or excessive phaseimbalance constitutes abuse and may cause damage toelectrical components. Such operation would invalidateany applicable Bryant warranty.
Field Control Wiring —
The 549J unit requires an external temperature controldevice. This device can be a thermostat emulation deviceprovided as part of a third--party Building ManagementSystem or the RTU Open controller (RTU Open controlleris available as a factory--installed option only).
Thermostat —
Select a Bryant--approved accessory thermostat. Whenelectric heat is installed in the 549J unit, the thermostat mustbe capable of energizing the G terminal (to energize theIndoor Fan Contactor) whenever there is a space call forheat (energizing the W1 terminal). Accessory thermostatslisted on the unit price pages can provide this signal but theyare not configured to enable this signal as shipped.
X
C
G
W2
C
W2
G
W1
O/B/Y2 Y2
R
W1
R
Y1 Y1
THERMOSTAT
(Note 1)
(Note 2)
Note 1: Typical multi-function marking. Follow manufacturer’s configuration instructions to select Y2. Do not configure for O output.
Note 2: W2 connection not required on units without electric heating.
Field Wiring
CentralTerminalBoard
TypicalThermostatConnections
C09012
Fig. 27 -- Typical Low--Voltage Control Connections
Install the accessory thermostat according to installationinstructions included with the accessory.
Locate the thermostat accessory on a solid wall in theconditioned space to sense average temperature inaccordance with the thermostat installation instructions.
If the thermostat contains a logic circuit requiring 24--vpower, use a thermostat cable or equivalent single leads ofdifferent colors with minimum of seven leads. If thethermostat does not require a 24--v source (no “C”connection required), use a thermostat cable or equivalentwith minimum of six leads. Check the thermostatinstallation instructions for additional features whichmight require additional conductors in the cable.
20
For wire runs up to 50 ft. (15 m), use no. 18 AWG(American Wire Gage) insulated wire [35_C (95_F)minimum]. For 50 to 75 ft. (15 to 23 m), use no. 16 AWGinsulated wire [35_C (95_F) minimum]. For over 75 ft.(23 m), use no. 14 AWG insulated wire [35_C (95_F)minimum]. All wire sizes larger than no. 18 AWG cannotbe directly connected to the thermostat and will require ajunction box and splice at the thermostat.
Central Terminal Board
The Central Terminal Board (CTB) is a pass throughconnection point. The CTB provides the capability to addfactory--installed options and field--installed accessories tothe units by cutting jumper wires without having to changeor reroute wires through the structure of the unit. The CTBdoes not provide any microprocessor control; it is simply abasic multifunction wiring terminal configuration.
Commercial Defrost Control
The Commercial Defrost Control Board (DFB)coordinates thermostat demands for supply fan control, 1or 2 stage cooling, 2 stage heating, emergency heating anddefrost control with unit operating sequences. The DFBalso provides an indoor fan off delay feature (userselectable). See Fig. 28 for board arrangement.
The DFB is located in the 549J’s main control box (seeFig. 29). All connections are factory--made throughharnesses to the unit’s CTB, to IFC (belt--drive motor) orto ECM (direct--drive motor), reversing valve solenoidsand to defrost thermostats. Refer to Table 5 for details ofDFB Inputs and Outputs.
Reversing valve control — The DFB has two outputs forunit reversing valve control. Operation of the reversingvalves is based on internal logic; this application does notuse an “O” or “B” signal to determine reversing valveposition. Reversing valves are energized during thecooling stages and the defrost cycle and de--energizedduring heating cycles. Once energized at the start of acooling stage, the reversing valve will remain energizeduntil the next heating cycle demand is received. Oncede--energized at the start of a Heating cycle, the reversingvalves will remain de--energized until the next coolingstage is initiated.
DIPSwitches
Speed-UpJumpers
C09275
Fig. 28 -- Defrost Control Board Arrangement
Compressor control — The DFB receives inputsindicating Stage 1 Cooling, Stage 2 Cooling and Stage 1Heating from the space thermostat or unit control system(RTU Open controller); it generates commands to startcompressors with or without reversing valve operation toproduce Stage 1 Cooling (one compressor on 08--09systems, compressor unloaded on 07 2--stage system),Stage 2 Cooling (both compressors run on 08--09 systems,compressor full load on 07 2--stage system) or Stage 1Heating (both compressors run on 08--09 systems; the 07systems have only one compressor).
Auxiliary (Electric) Heat control — The 549J unit can beequipped with one or two auxiliary electric heaters, toprovide a second stage of heating. The DFB will energizethis Heating System for a Stage 2 Heating Command(heaters operate concurrently with compressor(s) in the Stage1 Heating cycle), for an Emergency Heating sequence(compressors are off and only the electric heaters areenergized) and also during the Defrost cycle (to eliminate a“cold blow” condition in the space).
C09276
Fig. 29 -- Defrost Control Board Location
21
Table 5 – 549J Defrost Board I/O and Jumper ConfigurationsInputs
Point Name Type of I/O Connection Pin Number Unit Connection NoteG Fan DI, 24Vac P2---3 CTB---GY1 Cool 1 DI, 24Vac P2---5 CTB---Y1Y2 Cool 2 DI, 24Vac P2---4 CTB---Y2W1 Heat 1 DI, 24Vac P2---7 CTB---W1W2 Heat 2 DI, 24Vac P2---6 CTB---W2R Power 24Vac P3---1 CONTL BRD---8C Common 24Vac P3---2 CONTL BRD---4DFT1 DI, 24Vac DFT---1 to DFT---1DFT 2 DI, 24Vac DFT---2 to DFT---2
OutputsPoint Name Type of I/O Connection Pin Number Unit Connection NoteIFO Fan On DO, 24Vac P3---9 REHEAT---2OF OD Fan On DO, 24Vac OF OFRRVS1 DO, 24Vac P3---7 to P3---5 Energize in COOLRVS2 DO, 24Vac P3---6 to P3---4 Energize in COOLCOMP 1 DO, 24Vac P3---10 FPT --- REHEAT---6COMP 2 DO, 24Vac P3---8 REHEAT---8HEAT 2 DO, 24Vac E---HEAT HC---1 (TB4---1)COM 24Vac P3---3 HC---1 (TB4---3)
ConfigurationPoint Name Type of I/O Connection Pin Number Unit Connection NoteSelect Jumper 24Vac P1---12 Compressor 24Vac P1---3 Use for 549J*07/08/09D
Speed--Up ConfigurationPoint Name Type of I/O Connection Pin Number Unit Connection NoteSpeed---Up Jumper JMP17Speed---Up Jumper JMP18
Jumper for 1--3 seconds: Factory Test, defrost runs for 9 secondsJumper for 5--20 seconds: Forced Defrost, defrost runs for 30 seconds if DFT2 is open
Defrost — The defrost control mode is a time/temperaturesequence. There are two time components: Thecontinuous run period and the test/defrost cycle period.The temperature component is provided by DefrostThermostat 1 and 2 (DFT1 and DFT2 [08--09 only])mounted on the outdoor coil.
The continuous run period is a fixed time period between theend of the last defrost cycle (or start of the current Heatingcycle) during which no defrost will be permitted. This periodcan be set at 30, 60, 90 or 120 minutes by changing thepositions of DIP switches SW1 and SW2 (see Fig. 30 andTable 6). The default run periods are 30 minutes for unit size07 and 90 minutes for unit sizes 08--09.
Shorting the jumpers for a period of 5 to 20 secs bypassesthe remaining continuous run period and places the unit ina Forced Defrost mode. If the controlling DFT is closedwhen this mode is initiated, the unit will complete anormal defrost period that will terminate when the
controlling DFT opens or the 10 minute defrost cycle limitis reached. If the controlling DFT is open when this modeis initiated, the Defrost cycle will run for 30 secs. Bothmodes end at the end of the Defrost cycle.
C09283
Fig. 30 -- DIP Switch Settings — Defrost Board
Table 6 – Dip Switch Position
Switch No.
1 2 1 2 1 2 1 2 3
1 J 1 J 1 1 J J 1 On
0 J 0 J 0 J J 0 0 J Off
30 minutes 60 minutes 90 minutes 120 minutes Fan Delay
22
Unit without thru--base connection kit —
Pass the thermostat control wires through the holeprovided in the corner post; then feed the wires throughthe raceway built into the corner post to the control box.Pull the wires over to the terminal strip on the upper--leftcorner of the Central Terminal Board (CTB). See Fig. 31.
RACEWAY
HOLE IN END PANEL (HIDDEN)
C08027
Fig. 31 -- Field Control Wiring Raceway
NOTE: If thru--the--bottom connections accessory isused, refer to the accessory installation instructions forinformation on routing power and control wiring.
Heat Anticipator Settings —
Set heat anticipator settings at 0.14 amp for the first stageand 0.14 amp for second--stage heating, when available.
Electric Heaters
549J units may be equipped with field--installed accessoryelectric heaters. The heaters are modular in design, withheater frames holding open coil resistance wires strungthrough ceramic insulators, line--break limit switches anda control contactor. One or two heater modules may beused in a unit.Heater modules are installed in the compartment belowthe indoor (supply) fan outlet. Access is through theindoor access panel. Heater modules slide into thecompartment on tracks along the bottom of the heateropening. See Fig. 32, Fig. 33 and Fig. 34.Not all available heater modules may be used in everyunit. Use only those heater modules that are UL listed foruse in a specific size unit. Refer to the label on the unitcabinet for the list of approved heaters.Unit heaters are marked with Heater Model Numbers. Butheaters are ordered as and shipped in cartons marked witha corresponding heater Sales Package part number. SeeTable 7 for correlation between heater Model Number andSales Package part number.NOTE: The value in position 9 of the part number differsbetween the sales package part number (value is 1 or 3)and a bare heater model number (value is 0).
DISCONNECT MOUNTINGLOCATION
UNIT BLOCK-OFFPANEL
OUTDOORACCESS PANEL
INDOORACCESSPANEL
C08133
Fig. 32 -- Typical Access Panel Location
DISCONNECTMOUNTINGLOCATION
EMT OR RIGID CONDUIT(FIELD-SUPPLIED)
SINGLEPOINT BOX
CENTERPOST
HEATERCOVERS
HEATERMOUNTINGBRACKET
HEATERMODULE(LOCATION 2)
HEATERMODULE(LOCATION 1)
SINGLE POINTBOXMOUNTINGSCREW
BRACKET ANDCONDUITDRIP BOOT
MAINCONTROLBOX
CONTROL WIRE TERMINAL BLOCK
MANUAL RESETLIMIT SWITCH
C08134
Fig. 33 -- Typical Component Location
TRACK
FLANGE
C08135
Fig. 34 -- Typical Module Installation
23
Table 7 – Heater Model Number
Bare Heater Model Number C R H E A T E R 0 0 1 A/B 0 0
Heater Sales Package P/NIncludes:Bare HeaterCarton and packing materialsInstallation sheet
C R H E A T E R 1 0 1 A/B 0 0
Single Point Boxes and Supplementary Fuses —
When the unit MOCP device value exceeds 60--A,unit--mounted supplementary fuses are required for eachheater circuit. These fuses are included in accessory SinglePoint Boxes, with power distribution and fuse blocks. Thesingle point box will be installed directly under the unitcontrol box, just to the left of the partition separating theindoor section (with electric heaters) from the outdoorsection. The Single Point Box has a hinged access cover. SeeFig. 35. The Single Point Box also includes pigtails tocomplete the wiring between the Single Point Box and theunit’s main control box terminals. Refer to the accessoryheater and Single Point Box installation instructions fordetails on tap connections.
ALLIED PA
MODEL NO.
ERIAL NO.
CORP.
OD
22.2
3123
ISTED AIRNDITIONINGUIP ACCESS 346N.
P / N 2- 5610-4 REV
1113
2123
CONTROLBOX
BUSHING
SINGLEPOINT BOXMOUNTINGSCREWS
FOAMBUSHING
DRIP BOOTBRACKETMOUNTINGSCREWS
HEATERRELAYS
POWERWIRES
HEATERMOUNTINGSCREWS
C14253
Fig. 35 -- Typical Single Point Installation
All fuses on 549J units are 60--A. (Note that all heaters arequalified for use with a 60--A fuse, regardless of actualheater ampacity, so only 60--A fuses are necessary.)
Single Point Boxes without Fuses —
Unit heater applications not requiring supplemental fusesrequire a special Single Point Box without any fuses. Theaccessory Single Point Boxes contain a set of power tapsand pigtails to complete the wiring between the SinglePoint Box and the unit’s main control box terminals. Referto accessory heater and Single Point Box installationinstructions for details on tap connections.
Low--Voltage Control Connections —
Run the low--voltage control leads from the heatermodule(s) -- VIO and BRN (two of each if two modulesare installed; identify for Module #1) -- to the 4--poleterminal board TB4 located on the heater bulkhead to theleft of Heater #1. Connect the VIO leads from Heater #1and Heater #2 to terminal TB4--1. Connect the BRN leadsto terminal TB4--3. See Fig. 36.
DEFROSTBOARD
ORN
BRN
FieldConnections
E-HEAT
P3-3
1 3
ORN BRN
VIO BRN BRNVIO
TB4
VIO HR2
HR1
BRN
VIO BRN
Elec Htr
HR1: On Heater 1 in Position #1HR2: On Heater 2 in Position #2 (if installed)
C09013
Fig. 36 -- Accessory Electric Heater ControlConnections
Variable Frequency Drive (VFD) 2--Speed IndoorFan Motor System (Factory--Installed)
For details on operating 549J 2 stage cooling unitsequipped with the factory--installed Variable FrequencyDrive (VFD) 2--Speed Indoor Fan Motor System option,refer to the Variable Frequency Drive (VFD) Installation,Start--Up and Service Instructions.
24
EconoMi$erR X (Factory--Installed Option)
C14154
Fig. 37 -- W7220 Economizer Module
Product Description —
The EconoMi$er X system is an expandable economizercontrol system, which includes a W7220 economizermodule (controller) with an LCD and keypad. The W7220can be configured with optional sensors.
The W7220 economizer module can be used as astand--alone economizer module wired directly to acommercial set--back space thermostat and sensors toprovide outside air dry--bulb economizer control.
The W7220 economizer module can be connected tooptional sensors for single or differential enthalpy control.The W7220 economizer module provides power andcommunications for the sensors.
The W7220 economizer module automatically detectssensors by polling to determine which sensors are present.If a sensor loses communications after it has beendetected, the W7220 economizer controller indicates adevice fail error on its LCD.
System Components —
The EconoMi$er X system includes an economizer module,20k mixed air sensor, damper actuator, and either a 20koutdoor air temperature sensor or S--Bus enthalpy sensors.
Economizer Module: This is the core of the EconoMi$er Xsystem, is mounted in the unit’s control box, and includesthe user interface for the system. The W7220 economizermodule provides the basic inputs and outputs to providesimple economizer control. When used with the optionalsensors, the economizer module provides more advancedeconomizer functionality.
S--Bus Enthalpy Control Sensors: The S--Bus enthalpycontrol sensor is a combination temperature and humiditysensor which is powered by and communicates on theS--Bus. Up to three sensors may be configured with theW7220 economizer module. See S--Bus Sensor Wiring onpage 25 for details.
CO2 Sensor (optional): A CO2 sensor can be added forDemand Controlled Ventilation (DCV).
Specifications
W7220 Economizer Module —
The module is designed for use with 2 to 10 Vdc or buscommunicating actuator. The module includes terminalsfor CO2 sensor, mixed air sensor, and an outdoor dry bulbsensor. Enthalpy and other options are available with bussensors.
User Interface: Provides status for normal operation,setup parameters, checkout tests, and alarm and errorconditions with a 2--line 16 character LCD display andfour button keypad.
Electrical —
Rated Voltage: 20 to 30 Vac RMS, 50/60 HzTransformer: 100 va maximum system input
Nominal Power Consumption (at 24 Vac, 60 Hz):11.5 VA without sensors or actuators
Relay Digital Output Rating at 30 Vac (maximumpower from Class 2 input only): 1.5A run:3.5A inrush at 0.45PF (200,000 cycles) or7.5A inrush at 0.45PF (100,000 cycles)
External Sensors Power Output: 21 Vdc 5% at 48mA
IMPORTANT: All inputs and outputs must be Class 2wiring.
Inputs —
Sensors:
NOTE: A mixed air (MA) analog sensor is required onall W7220 units; either an outdoor air (OA) sensor for drybulb change over or an OA bus sensor for outdoorenthalpy change over is required in addition to the MAsensor. An additional return air (RA) bus sensor can beadded to the system for differential enthalpy or dry bulbchangeover. For differential dry bulb changeover a 20kohm sensor is required in the OA and a bus sensor in theRA. DIP switch on RA bus sensor must be set in the RAposition.
Dry Bulb Temperature (optional) and Mixed Air(required), 20k NTC:2--wire (18 to 22 AWG);Temperature range --40 to 150_F (--40 to 65_C).Temperature accuracy --0_F/+2_F
Temperature and Humidity, C7400S1000 (optional):S--Bus; 2--wire (18 to 22 AWG)Temperature: range --40 to 150_F (--40 to 65_C)Temperature accuracy --0_F/+2_FHumidity: range 0 to 100% RH with 5% accuracy.
NOTE: Up to three (3) S--Bus sensors may be connectedto the W7220 economizer module. For outdoor air (OA),return air (RA) and discharge (supply) air (DA).
4 Binary inputs:1--wire 24 Vac + common GND (see Fig. 40 on page 26for wiring details). 24 Vac power supply: 20 to 30 Vac50/60Hz; 100 VA Class 2 transformer.
25
Outputs —
Actuator signal: 2--10 Vdc; minimum actuator impedanceis 2k ohm; bus two--wire output for bus communicatingactuators.
Exhaust fan, Y1, Y2 and AUX1 O:All Relay Outputs (at 30 Vac):Running: 1.5A maximumInrush: 7.5A maximum
Environmental —
Operating Temperature: --40 to 150_F (--40 to 65_C).Exception of display operation down to --4_F with fullrecovery at --4_F from exposure to --40_F
Storage Temperature: --40 to 150_F (--40 to 65_C)
Shipping Temperature: --40 to 150_F (--40 to 65_C)
Relative Humidity: 5% to 95% RH non--condensing
Economizer Module Wiring Details —
Use Fig. 38 and Tables 8 and 9 to locate the wiringterminals for the economizer module.
NOTE: The four terminal blocks are removable. You canslide out each terminal block, wire it, and then slide itback into place.
W7220 Controller
Left TerminalBlock Label
Right TerminalBlock Label
NOTE: The bottom 4 Pin actuator header is not used
C14156
Fig. 38 -- W7220 Economizer Module TerminalConnection Labels
S--Bus Sensor Wiring —
The labels on the sensors and controller are color codedfor ease of installation. Orange labeled sensors can onlybe wired to orange terminals on the controller. Brownlabeled sensors can only be wired to S--Bus (brown)terminals. Use Fig. 39 and Table 10 to locate the wiringterminals for each S--Bus sensor.
Use Fig. 39 and Table 11 to set the DIP switches for thedesired use of the sensor.
Table 8 – Economizer Module --Left Hand Terminal Blocks
Label Type Description
Top Left Terminal Block
MATMAT
20k NTCandCOM
Supply Air Temperature Sensor(polarity insensitive connection)
OATOAT
20k NTCandCOM
Outdoor Air Temperature Sensor(polarity insensitive connection)
S---BUSS---BUS
S---Bus(Sylk* Bus)
Enthalpy Control Sensor(polarity insensitive connection)
Bottom Left Terminal Block
IAQ 2---10 2---10 Vdc Air Quality Sensor Input(e.g. CO2 sensor)
IAQ COM COM Air Quality Sensor Common
IAQ 24V 24 Vac Air Quality Sensor 24 Vac Source
ACT 2---10 2---10 Vdc Damper Actuator Output (2---10 Vdc)
ACT COM COM Damper Actuator Output Common
ACT 24V 24 Vac Damper Actuator 24 Vac Source
n/a The bottom pin is not used.
Table 9 – Economizer Module --Right Hand Terminal Blocks
Label Type Description
Top Right Terminal Block
n/a The first pin is not used
AUX2 I 24 Vac IN Shut Down (SD) or Heat (W)Conventional onlyor
Heat Pump Changeover (O/B) inHeat Pump mode.
OCC 24 Vac IN Occupied / Unoccupied Input
E---GND E---GND Earth Ground --- System Required
EXH1 24 Vac OUT Exhaust Fan 1 Output
AUX1 O 24 Vac OUT Programmable:Exhaust fan 2 outputorERVorSystem Alarm output
Bottom Right Terminal Block
Y2--- I 24 Vac IN Y2 in --- Cooling Stage 2 Input fromspace thermostat
Y2---O 24 Vac OUT Y2 out --- Cooling Stage 2 Output tostage 2 mechanical cooling
Y1--- I 24 Vac IN Y1 in --- Cooling Stage 1 Input fromspace thermostat
Y1---O 24 Vac OUT Y1 out --- Cooling Stage 1 Output tostage 1 mechanical cooling
C COM 24 Vac Common
R 24 Vac 24 Vac Power (Hot)
* Sylk is a trademark of Honeywell International Inc.
26
DIPSwitchLabel
DIPSwitches(3)
S-Bus2 Pin SideConnector
S-BusTerminals(1 and 2)
C14178
Fig. 39 -- S--Bus Sensor DIP Switches
Table 10 – Enthalpy Control Sensor WiringTerminations*
TerminalType Description
Nbr Label
1 S---BUS S---BUS S---Bus Communications(Enthalpy Control Sensor Bus)
2 S---BUS S---BUS S---Bus Communications(Enthalpy Control Sensor Bus)
* Terminals are polarity insensitive.
Table 11 – Enthalpy Control Sensor DIP Switch Settings
UseDIP Switch Positions for Switches 1, 2, and 3
1 2 3
DA* OFF ON OFF
RA[ ON OFF OFF
OA** OFF OFF OFF
* DA = Discharge Air[ RA = Return Air** OA = Outside Air
NOTE: When a S--Bus sensor is connected to an existingnetwork, it will take 60 minutes for the network torecognize and auto--configure itself to use the new sensor.During the 60 minute setup period, no alarms for sensorfailures (except SAT) will be issued and no economizingfunction will be available.
CO2 Sensor Wiring —
When using a CO2 sensor the black and brown commonwires are internally connected and only one is connectedto “IAQ COM” on the W7220. Use the power from theW7220 to power the CO2 sensor OR make sure the ground
for the power supplies are common. See Fig. 40 for CO2sensor wiring.
CO2 SENSOR
24V
ANALOGOUT
L1(HOT)L2
RED
BLACK
YELLOW
BROWN
ORANGE
GREEN
+
–
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTIONAS REQUIRED.
1
1
C14158
Fig. 40 -- Wiring for CO2 Sensor
Interface Overview
This section describes how to use the economizer’s userinterface for:
S Keypad and menu navigation
S Settings and parameter changes
S Menu structure and selection
User Interface —
The user interface consists of a 2--line LCD display and a4--button keypad on the front of the economizer controller.
2 LINELCD
MENU UP(EXIT)
BUTTONSCROLL
UP/DOWNBUTTONS
SELECT(ENTER)BUTTON
C14206
Fig. 41 -- W7220 Controller
Keypad —
The four navigation buttons (see Fig. 41) are used to scrollthrough the menus and menu items, select menu items,and to change parameter and configuration settings.
27
To use the keypad when working with menus:
S Press the (Up arrow) button to move to the previousmenu.
S Press the (Down arrow) button to move to the nextmenu.
S Press the (Enter) button to display the first item inthe currently displayed menu.
S Press the (Menu Up/Exit) button to exit a menu’sitem and return to the list of menus.
To use the keypad when working with Setpoints, Systemand Advanced Settings, Checkout tests and Alarms:
1. Navigate to the desired menu.2. Press the (Enter) button to display the first item inthe currently displayed menu.
3. Use the and buttons to scroll to the desiredparameter.
4. Press the (Enter) button to display the value of thecurrently displayed item.
5. Press the button to increase (change) the displayedparameter value.
6. Press the button to decrease (change) the displayedparameter value.NOTE: When values are displayed, pressing and
holding the or button causes thedisplay to automatically increment.
7. Press the (Enter) button to accept the displayedvalue and store it in nonvolatile RAM.
8. “CHANGE STORED” displays.9. Press the (Enter) button to return to the currentmenu parameter.
10. Press the (Menu Up/Exit) button to return to theprevious menu.
Menu Structure
Table 12 illustrates the complete hierarchy of menus andparameters for the EconoMi$erR X system.
The Menus in display order are:
S STATUS
S SETPOINTS
S SYSTEM SETUP
S ADVANCED SETUP
S CHECKOUT
S ALARMS
IMPORTANT: Table 12 illustrates the completehierarchy. Your menu parameters may be differentdepending on your configuration.
For example if you do not have a DCV (CO2) sensor, thennone of the DCV parameters appear and only MIN POSwill display. If you have a CO2 sensor, the DCV MIN andDCV MAX will appear AND if you have 2 speed fanDCV MIN (high and low speed) and DCV MAX (highand low speed will appear).
NOTE: Some parameters in the menus use the letters MAor MAT, indicating a mixed air temperature sensorlocation before the cooling coil. This unit application hasthe control sensor located after the cooling coil, in the fansection, where it is designated as (Cooling) Supply AirTemperature or SAT sensor.
Setup and Configuration
Before being placed into service, the W7220 economizermodule must be setup and configured for the installedsystem.
IMPORTANT: During setup, the economizer module islive at all times.
The setup process uses a hierarchical menu structure thatis easy to use. You press the and arrow buttons tomove forward and backward through the menus and pressthe button to select and confirm setup item changes.
Time--out and Screensaver —
When no buttons have been pressed for 10 minutes, theLCD displays a screen saver, which cycles through theStatus items. Each Status items displays in turn and cyclesto the next item after 5 seconds.
Table 12 – Menu Structure*
Menu ParameterParameterDefaultValue
ParameterRange and Increment[
EXPANDED PARAMETER NAMENotes
STATUS ECON AVAIL NO YES/NO ECONOMIZING AVAILABLEYES = economizing available; the system can use outside air for freecooling when required
ECONOMIZING NO YES/NO ECONOMIZING ACTIVEYES = Outside air being used for first stage cooling.NO = Economizing not active
OCCUPIED NO YES/NO OCCUPIEDYES = OCC signal received from space thermostator unitary controller.YES = 24 Vac on terminal OCC.NO = 0 Vac on terminal OCC.
HEAT PUMP n/a** COOLHEAT
HEAT PUMP MODEDisplays COOL or HEAT when system is set to heat pump(non---conventional)
28
Table 12 -- Menu Structure* (cont)
Menu ParameterParameterDefaultValue
ParameterRange and Increment[
EXPANDED PARAMETER NAMENotes
STATUS(cont)
COOL Y1---IN OFF ON/OFF FIRST STAGE COOLING DEMAND (Y1---IN)Y1---I signal from space thermostat or unitary controller for Cooling Stage 1.ON = 24 Vac on terminal Y1---IOFF = 0 Vac on terminal Y1---I
COOL Y1---OUT OFF ON/OFF FIRST STAGE COOLING RELAY OUTPUTCool Stage 1 Relay Output to mechanical cooling (Y1---OUT terminal).
COOL Y2---IN OFF ON/OFF SECOND STAGE COOLING DEMAND (Y2---IN)Y2---I signal from space thermostat or unitary controller for Cooling Stage 2.ON = 24 Vac on terminal Y2---IOFF = 0 Vac on terminal Y2---I
COOL Y2---OUT OFF ON/OFF SECOND STAGE COOLING RELAY OUTPUTCool Stage 2 Relay Output to mechanical cooling (Y2---OUT terminal).
MA TEMP _ _.__F(or _ _.__C)
---40 to 150_F(---18 to 60_C)
SUPPLY AIR TEMPERATURE, Cooling ModeDisplays value of measured mixed/cooled air from SAT sensor in fansection.Displays --- ---.--- if not connected, short or out---of---range. See Menu Note 2
DA TEMP _ _.__F(or _ _.__C)
---40 to 150_F(---18 to 60_C)
DISCHARGE AIR TEMPERATURE, after Heating section(Accessory sensor required)Displays when Discharge Air sensor is connected and displays measureddischarge temperature.Displays --- ---.---_F if sensor sends invalid value, if not connected, short orout---of---range.
OA TEMP _ _.__F(or _ _.__C)
---40 to 140_F(---40 to 60_C)
OUTSIDE AIR TEMPERATUREDisplays measured value of outdoor air temperature.Displays --- ---_F if sensor sends invalid value, if not connected, short orout---of---range.
OA HUM _ _% 0 to 100% OUTSIDE AIR RELATIVE HUMIDITYDisplays measured value of outdoor humidity from OA enthalpy sensor.
RA TEMP _ _.__F(or _ _.__C)
0 to 140_F(---18 to 60_C)
RETURN AIR TEMPERATURE(Accessory sensor required)Displays measured value of return air temperature from RAT sensor.Displays --- ---_F if sensor sends invalid value, if not connected, short orout---of---range.
RA HUM _ _% 0 to 100% RETURN AIR RELATIVE HUMIDITY(Accessory enthalpy sensor required)Displays measured value of return air humidity from RA sensor.Displays --- ---% if sensor sends invalid value, if not connected, short orout---of---range.
IN CO2 _ _ _ ppm 0 to 2000 ppm SPACE/RETURN AIR CO2(CO2 sensor required, accessory or factory option)Displays value of measured CO2 from CO2 sensor.Invalid if not connected, short or out---of---range. May be adjusted inAdvanced menu by Zero offset and Span.
DCV STATUS n/a ON/OFF DEMAND CONTROLLED VENTILATION STATUS(CO2 sensor required, accessory or factory option)Displays ON if IN CO2 value above setpoint DCV SET and OFF if belowsetpoint DCV SET.
DAMPER OUT 2.0V 2.0 to 10.0V Displays output voltage or position to the damper actuator. ***
ACT POS n/a 0 to 100% Displays actual position of outdoor air damper actuator
ACT COUNT n/a 1 to 65535 Displays number of times actuator has cycled.1 Cycle equals accrued 180_ of actuator movement in any direction
ACTUATOR n/a OK/Alarm(on Alarm menu)
Displays Error if voltage or torque is below actuator range
EXH1 OUT OFF ON/OFF EXHAUST STAGE 1 RELAY OUTPUTOutput of EXH1 terminal. Displays On when damper position reachesprogrammed percentage setpoint.ON = 24 Vac Output; OFF = No Output.
EXH2 OUT OFF ON/OFF EXHAUST STAGE 2 RELAY OUTPUTOutput of AUX1 O terminal Displays ON when damper position reachesprogrammed percentage setpointON = 24 Vac Output, OFF = No Output; displays only if AUX1 O =EXH2
ERV OFF ON/OFF ENERGY RECOVERY UNIT RELAY OUTPUTOutput of AUX1 O terminal, ON = 24 Vac Output, OFF = No Output;displays only if AUX1 O = ERV
MECH COOL ONorHEAT STAGES ON
0 0, 1, or 2 Displays stage of mechanical cooling that is active.
Displays the stage of heat pump heating that is active
FAN SPEED n/a LOW or HIGH SUPPLY FAN SPEEDDisplays speed setting of fan on a 2---speed fan unit.
W (HEAT ON) n/a ON/OFF HEAT DEMAND STATUSDisplays status of heat demand on a 2---speed fan unit.
29
Table 12 -- Menu Structure* (cont)
Menu ParameterParameterDefaultValue
ParameterRange and Increment[
EXPANDED PARAMETER NAMENotes
SETPOINTS MAT SET 53_F(12_C)
38 to 70_F;(3 to 21_C)increment by 1
SUPPLY AIR SETPOINTSetpoint determines where the economizer will modulate the OA damper tomaintain the mixed air temperature.See Menu Note 2.
LOW T LOCK 32_F(0_C)
---45 to 80_F;( ---43 to 27_C)increment by 1
COMPRESSOR LOW TEMPERATURE LOCKOUTSetpoint determines outdoor temperature when the mechanical coolingcannot be turned on. Commonly referred to as the Compressor lockout. Ator below the setpoint the Y1---O and Y2---O will not be energized on thecontroller.
DRYBLB SET 63_F(17_C)
48 to 80_F(9 to 27_C)increment by 1
OA DRY BULB TEMPERATURE CHANGEOVER SETPOINTSetpoint determines where the economizer will assume outdoor airtemperature is good for free cooling; e.g.: at 63_F (17_C), unit willeconomize at 62_F (16.7_C) and below and not economize at 64_F(17.8_C) and above. There is a 2_F (1.1_C) deadband.See Menu Note 3
ENTH CURVE ES3 ES1, ES2, ES3, ES4, orES5
ENTHALPY CHANGEOVER CURVE(Requires enthalpy sensor option)Enthalpy boundary “curves” for economizing using single enthalpy.See page 36 for description of enthalpy curves.
DCV SET 1100ppm 500 to 2000 ppm;increment by 100
DEMAND CONTROLLED VENTILATION SETPOINTDisplays only if CO2 sensor is connected. Setpoint for Demand ControlledVentilation of space. Above the setpoint, the OA dampers will modulateopen to bring in additional OA to maintain a space ppm level below thesetpoint.
MIN POS 2.8 V 2 to 10 Vdc VENTILATION MINIMUM POSITIONDisplays ONLY if a CO2 sensor is NOT connected.
With 2---speed fan units MIN POS L (low speed fan) and MIN POS H (highspeed fan) settings are required. Default for MIN POS L is 3.2V and MINPOS H is 2.8V.
VENTMAX 2.8 V 2 to 10 Vdc DCV MAXIMUM DAMPER POSITIONDisplays only if a CO2 sensor is connected. Used for Vbz (ventilation maxcfm) setpoint. VENTMAX is the same setting as MIN POS would be if youdid not have the CO2 sensor.
100 to 9990 cfmincrement by 10
If OA, MA RA and CO2 sensors are connected and DCV CAL ENABLE isset to AUTO mode, the OA dampers are controlled by CFM and displaysfrom 100 to 9990 cfm.
2 to 10 Vdc With 2---speed fan units VENTMAX L (low speed fan) and VENTMAX H(high speed fan) settings are required. Default for VENTMAX L is 3.2V andVENTMAX H is 2.8V.
VENTMIN 2.25 V 2 to 10 Vdc DCV MINIMUM DAMPER POSITIONDisplays only if CO2 sensor is connected. Used for Va (ventilation min cfm)setpoint. This is the ventilation requirement for less than maximumoccupancy of the space.
100 to 9990 cfmincrement by 10
If OA, MA RA and CO2 sensors are connected and DCV CAL ENABLE isset to AUTO mode, the OA dampers are controlled by CFM and displaysfrom 100 to 9990 cfm.
2 to 10 Vdc With 2---speed fan units VENTMIN L (low speed fan) and VENTMIN H(high speed fan) settings are required. Default for VENTMIN L is 2.5Vand VENTMIN H is 2.25V.
ERV OAT SP[[ 32_F(0_C)
0 to 50_F;( ---18 to 10_C)increment by 1
ENERGY RECOVERY VENTILATION UNIT OUTDOOR AIR TEMPERATURESETPOINTOnly when AUX1 O = ERV
EXH1 SET 50% 0 to 100%;Increment by 1
EXHAUST FAN STAGE 1 SETPOINTSetpoint for OA damper position when exhaust fan 1 is powered by theeconomizer.With 2---speed fan units Exh1 L (low speed fan) and Exh1 H (high speedfan) settings are required. Default for Exh1 L is 65% and Exh1 H is 50%
EXH2 SET 75% 0 to 100%;Increment by 1
EXHAUST FAN STAGE 2 SETPOINTSetpoint for OA damper position when exhaust fan 2 is powered by theeconomizer. Only used when AUX1 O is set to EHX2.With 2---speed fan units Exh2 L (low speed fan) and Exh2 H (high speedfan) settings are required. Default for Exh2 L is 80% and Exh2 H is 75%
30
Table 12 -- Menu Structure* (cont)
Menu ParameterParameterDefaultValue
ParameterRange and Increment[
EXPANDED PARAMETER NAMENotes
SYSTEMSETUP
INSTALL 01/01/10 Display order = MM/DD/YYSetting order = DD, MM, then YY.
UNITS DEG _F _F or _C Sets economizer controller in degrees Fahrenheit or Celsius.
EQUIPMENT CONV Conventional or HP CONV = conventional;HP O/B = Enable Heat Pump mode. Use AUX2 I for Heat Pump input fromthermostat or controller.See Menu Note 4
AUX2 IN n/a Shutdown (SD)Heat (W1)HP (O)HP (B)
In CONV mode:SD = Enables configuration of shutdown (default);W = Informs controller that system is in heating mode.NOTE: If using 2---speed fan mode, you must program CONV mode
for W. Shutdown is not available in 2---speed fan mode.See Menu Note 4.
In HP O/B mode:HP(O) = energize heat pump on Cool (default);HP(B) = energize heat pump on Heat.
FAN SPEED 1speed 1 speed/2 speed
Sets economizer controller for operation of 1 speed or 2 speed supply fan.The controller does not control the fan but positions the OA and RAdampers to the heating or cooling mode. See page 31 for modes andposition.NOTE: 2---speed fan option also needs Heat (W1) programmed in
AUX 2 In. See Menu Note 4.
FAN CFM 5000cfm 100 to 15000 cfm;increment by 100
UNIT DESIGN AIRFLOW (CFM)Enter ONLY if using DCVCAL ENA = AUTOThe value is found the nameplate label for the specific RTU.
AUX1 OUT NONE NONEERVEXH2SYS
Select OUTPUT for AUX1 O relayNONE = not configured (output is not used)ERV = Energy Recovery Ventilator[[
EXH2 = second damper position 24 Vac out for second exhaust fanSYS = use output as an alarm signal
OCC INPUT INPUT or ALWAYS OCCUPIED MODE BY EXTERNAL SIGNALWhen using a setback thermostat with occupancy out (24 Vac), the 24 Vacis input “INPUT” to the OCC terminal. If no occupancy output from thethermostat then change program to “ALWAYS” OR add a jumper fromterminal R to OCC terminal.See Menu Note 1.
FACTORY DEFAULT NO NO or YES Resets all set points to factory defaults when set to YES. LCD will brieflyflash YES and change to NO but all parameters will change to the factorydefault values.NOTE: RECHECK AUX2 IN and FANTYPE for required 2---speed
values.
ADVANCEDSETUP
MA LO SET 45_F(7_C)
35 to 65_F;(2 to 18_C)Incremented by 1_
SUPPLY AIR TEMPERATURE LOW LIMITTemperature to activate Freeze Protection (close damper and alarm iftemperature falls below setup value)
FREEZE POS CLO CLO or MIN FREEZE PROTECTION DAMPER POSITIONDamper position when freeze protection is activeCLO = closedMIN = MIN POS or VENTMAX
CO2 ZERO 0ppm 0 to 500 ppm:Increment by 10
CO2 ppm level to match CO2 sensor start level.
CO2 SPAN 2000ppm 1000 to 3000 ppm;Increment by 50
CO2 ppm span to match CO2 sensor. e.g.; 500---1500 sensor output wouldbe 500 CO2 zero and 1000 CO2 span.
STG3 DLY 2.0h 0 min, 5 min, 15 min,then 15 min intervals.Up to 4 h or OFF
COOLING STAGE 3 DELAYDelay after stage 2 for cool has been active. Turns on second stage ofmechanical cooling when economizer is first stage call and mechanicalcooling is second stage call. Allows three stages of cooling, 1economizer and 2 mechanical.OFF = no Stage 3 cooling.
SD DMPR POS CLO CLO or OPN Indicates shutdown signal from space thermostat or unitary controller.When controller receives 24 Vac input on the SD terminal in conventionalmode, the OA damper will open if programmed for OPN and OA damperwill close if programmed for CLO. All other controls, e.g., Y1---O, Y2---O,EXH1, etc. will shut off.NOTE: Function NOT AVAILABLE with 2---speed mode
DA LO ALM 45_F(7_C)
NONE35 to 65_F; (2 to 18_C)Incremented by 5_
Used for alarm for when the DA air temperature is too low. Set lower rangeof alarm, below this temperature the alarm will show on the display.
DA HI ALM 80_F(27_C)
NONE70 to 180_F; (21 to 82_C)Incremented by 5_
Used for alarm for when the DA air temperature is too high. Set high rangeof alarm, above this temperature the alarm will show on the display
DCVCAL ENA MAN MAN (manual)AUTO
Turns on the DCV automatic control of the dampers. Resets ventilationbased on the RA, OA and MA sensor conditions. Requires all sensors (RA,OA, MA and CO2).NOTE: This operation is not operable with a 2---speed fan unit.
31
Table 12 -- Menu Structure* (cont)
Menu ParameterParameterDefaultValue
ParameterRange and Increment[
EXPANDED PARAMETER NAMENotes
ADVANCEDSETUP(cont)
MAT T CAL 0.0_F(or C)
+/---2.5_F(+/---1.4_C)
SUPPLY AIR TEMPERATURE CALIBRATIONAllows for the operator to adjust for an out of calibration supply airtemperature (SAT) sensor
OAS T CAL 1.0_F(or C)
+/---2.5_F(+/---1.4_C)
OUTSIDE AIR TEMPERATURE CALIBRATIONAllows for the operator to adjust for an out of calibration outside airtemperature (OAT) sensor
OAS H CAL 0% RH +/---10% RH OUTSIDE AIR HUMIDITY CALIBRATIONAllows for the operator to adjust for an out of outside air enthalpy sensor
RA T CAL 0.0_F(or C)
+/---2.5_F(+/---1.4_C)
RETURN AIR TEMPERATURE CALIBRATIONAllows for the operator to adjust for an out of calibration return airtemperature (RA) sensor
RA H CAL 0% RH +/---10% RH RETURN AIR HUMIDITY CALIBRATIONAllows for the operator to adjust for an out of calibration return air enthalpysensor
DA T CAL 0.0_F(or C)
+/---2.5_F(+/---1.4_C)
DISCHARGE AIR TEMPERATURE CALIBRATIONAllows for the operator to adjust for an out of calibration discharge airtemperature (DAT) sensor
2SP FAN DELAY 5 Minutes 0 to 20 minutes in1 minute increments
TIME DELAY ON 2nd STAGE ECONOMIZINGWhen in economizing mode this is the delay for the high speed fan to try tosatisfy the call for second stage cooling before the first stage mechanicalcooling is enabled.
CHECKOUT[[[
DAMPER MINIMUMPOSITION
n/a n/a The checkout for the damper minimum positions is based on the system.See Table 13.
DAMPER OPEN n/a n/a Positions damper to the full open position.Exhaust fan contacts enable during the DAMPER OPEN test. Make sureyou pause in this mode to allow for exhaust contacts to energize due to thedelay in the system.
DAMPER CLOSE n/a n/a Positions damper to the fully closed position
CONNECT Y1---O n/a n/a Closes the Y1---O relay (Y1---O).See CAUTION on page 38.
CONNECT Y2---O n/a n/a Closes the Y2---O relay (Y2---O)See CAUTION on page 38.
CONNECT AUX1---O n/a n/a Energizes the AUX1---O output. If AUX1---O setting is:S NONE --- not action takenS ERV --- 24 Vac out. Turns on or signals an ERV that the conditionsare not good for economizing but are good for ERV operation. [[
S SYS --- 24 Vac out. Issues a system alarm.
CONNECT EXH1 n/a n/a Closes the power exhaust fan 1 relay (EXH1)
32
Table 12 -- Menu Structure* (cont)
Menu ParameterParameterDefaultValue
ParameterRange and Increment[
EXPANDED PARAMETER NAMENotes
ALARMS(#) Alarms display only when they are active. The menu title“ALARMS(#)” includes the number of active alarms in parenthesis ( ).When using S---Bus sensors, “SYLK” will appear on the screen, andwhen using 20k OA temperature sensors, “SENS T” will appear onthe screen.
MA T SENS ERR n/a n/a SUPPLY AIR TEMPERATURE SENSOR ERRORSupply air sensor has failed or become disconnected --- check wiringthen replace sensor if the alarm continues
CO2 SENS ERR n/a n/a CO2 SENSOR ERRORCO2 sensor has failed, gone out of range or become disconnected ---check wiring then replace sensor if the alarm continues
OA SYLK T ERR n/a n/a OUTSIDE AIR S---BUS SENSOR ERROROutside air enthalpy sensor has failed or become disconnected --- checkwiring then replace sensor if the alarm continuesOA SYLK H ERR n/a n/a
RA SYLK T ERR n/a n/a RETURN AIR S---BUS SENSOR ERRORReturn air enthalpy sensor has failed or become disconnected --- checkwiring then replace sensor if the alarm continuesRA SYLK H ERR n/a n/a
DA SYLK T ERR n/a n/a DISCHARGE AIR S---BUS SENSOR ERRORDischarge air sensor has failed or become disconnected --- check wiringthen replace sensor if the alarm continues
OA SENS T ERR n/a n/a OUTSIDE AIR TEMPERATURE SENSOR ERROROutside air temperature sensor has failed or become disconnected ---check wiring then replace sensor if the alarm continues
ACT ERROR n/a n/a ACTUATOR ERRORActuator has failed or become disconnected --- check for stall, overvoltage, under voltage and actuator count. Replace actuator if damper ismoveable and supply voltage is between 21.6 V and26.4 V. Check actuator count on STATUS menu.
FREEZE ALARM n/a n/a Check if outdoor temperature is below the LOW Temp Lockout onsetpoint menu. Check if Mixed air temperature on STATUS menu isbelow the Lo Setpoint on Advanced setup menu. When conditions areback in normal range then the alarm will go away.
SHUTDOWN ACTIVE n/a n/a AUX2 IN is programmed for SHUTDOWN and 24 V has been applied toAUX 2IN terminal
DMP CAL RUNNING n/a n/a DAMPER CALIBRATION ROUTINE RUNNINGIf DCV Auto enable has been programmed, when the W7220 iscompleting a calibration on the dampers, this alarm will display. Wait untilthe calibration is completed and the alarm will go away. Must have OA,MA and RA sensors for DCV calibration; set up is in the Advanced setupmenu.
DA SENS ALM n/a n/a DISCHARGE AIR TEMPERATURE SENSOR ALARMDischarge air temperature is out of the range set in the ADVANCEDSETUP Menu. Check the temperature of the discharge air.
SYS ALARM n/a n/a When AUX1---O is set to SYS and there is any alarm (e.g., failed sensors,etc.), the AUX1---O terminal has 24 Vac out.
ACT UNDER V n/a n/a ACTUATOR VOLTAGE LOWVoltage received at actuator is below expected range
ACT OVER V n/a n/a ACTUATOR VOLTAGE HIGHVoltage received at actuator is above expected range
ACT STALLED n/a n/a ACTUATOR STALLEDActuator stopped before reaching commanded position
* Table 12 illustrates the complete hierarchy. Your menu parameters may be different depending on your configuration.For example if you do not have a DCV (CO2) sensor, then none of the DCV parameters appear.
[ When values are displayed, pressing and holding theY orB button causes the display to automatically increment.** n/a = not applicable[[ ERV Operation: When in Cooling mode AND the conditions are NOT OK for economizing --- the ERV terminal will be energized.In the Heating mode the ERV terminal will be energized when the OA is below the ERV OAT setpoint in the setpoint menu.
*** When used with communicating actuator the damper out is reported in XX.X% open verses XX.X Vdc.[[[ After 10 minutes without a command or mode change, the controller will change to normal operation.
Menu Notes1 STATUS ---> OCCUPIED – The factory-standard Occupancy signal originates with a thermostat or other controller call for indoor fan operation at CTB ter-minal G. This signal passes through the Central Terminal Board’s OCCUPIED jumper JMP1 to the ECONO connector and to the W7220’s OCC input termin-al. An external timeclock or relay is required to implement an Occupancy schedule on the economizer damper position.
2 STATUS -> MA TEMP, SETPOINTS -> MAT SET – The W7220 menu parameters and labels include designations MA, MAT and Mixed Air for the economizercooling control sensor. On these rooftop units, the economizer control sensor is located downstream of the evaporator/indoor coil in the supply fan sectionwhere this sensor is designated as Supply Air Temperature (SAT) sensor.
3 SETPOINTS -> DRYBLB SET – This point is not displayed if a Return Air (differential) temperature sensor or an Outdoor Air enthalpy sensor is connected.4 SYSTEM SETUP parameters must be configured as noted for 2-Speed unit operation:EQUIPMENT = CONVAUX2 IN = WFAN SPEED = 2SPEED
33
Table 13 – Damper Minimum Position Settings and Readings on Checkout Menu
Fan Speed Demand Controlled Ventilation(CO2 Sensor)
Setpoints Checkout
1 NO MIN POS VMAX---HS
1 NO N/A N/A
2 NO MIN POS H VMAX---HS
2 NO MIN POS L VMAX---LS
1 YES VENT MIN VMIN---HS
1 YES VENT MAX VMAX---HS
2 YES VENT MIN H VMIN---HS
2 YES VENT MAX H VMAX---LS
2 YES VENT MIN L N/A
2 YES VENT MAX L N/A
Sequence of Operation
Table 14 – Dry Bulb Operation No DCV (CO2 Sensor) -- 1 Speed Fan
DemandControlledVentilation(DCV)
Outside Air ---Good toeconomize?
Y1‐I Y2-I Fan Speed Y1-O Y2-O Occupied Unoccupied
None No
Off Off High 0-v/Off 0-v/Off MIN POS Closed
On Off High 24-v/On 0-v/Off MIN POS Closed
On On High 24-v/On 24-v/On MIN POS Closed
None Yes
Off Off High 0-v/Off 0-v/Off MIN POS Closed
On Off High 0-v/Off 0-v/Off MIN POS to Full-Open Closed to Full-Open
On On High 24-v/On 0-v/Off * MIN POS to Full-Open Closed to Full-Open
* With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on second stage of mechanical cooling Y2 –O after the delay if the call for Y1---I and Y2---Ihave not been satisfied.
Table 15 – Dry Bulb Operation With DCV (CO2 Sensor) -- 1 Speed Fan
DemandControlledVentilation(DCV)
Outside Air ---Good toeconomize?
Y1‐I Y2-I Fan Speed Y1-O Y2-O Occupied Unoccupied
Below CO2 set
No
Off Off High 0-v/Off 0-v/Off VENTMIN Closed
On Off High 24-v/On 0-v/Off VENTMIN Closed
On On High 24-v/On 24-v/On VENTMIN Closed
Yes
Off Off High 0-v/Off 0-v/Off VENTMIN Closed
On Off High 0-v/Off 0-v/Off VENTMIN to Full-Open Closed to Full-Open
On On High 24-v/On 0-v/Off* VENTMIN to Full-Open Closed to Full-Open
Above CO2 set
No
Off Off High 0-v/Off 0-v/Off VENTMIN to VENTMAX Closed
On Off High 24-v/On 0-v/Off VENTMIN to VENTMAX Closed
On On High 24-v/On 24-v/On VENTMIN to VENTMAX Closed
Yes
Off Off High 0-v/Off 0-v/Off VENTMIN to VENTMAX Closed
On Off High 0-v/Off 0-v/Off VENTMIN to Full-Open Closed to Full-Open
On On High 24-v/On 0-v/Off* VENTMIN to Full-Open Closed to Full-Open
* With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on second stage of mechanical cooling Y2 –O after the delay if the call for Y1---I and Y2---Ihave not been satisfied.
34
Table 16 – Enthalpy Operation No DCV (CO2 Sensor) -- 1 Speed Fan
DemandControlledVentilation(DCV)
Outside Air ---Good toeconomize?
Y1‐I Y2-I Fan Speed Y1-O Y2-O Occupied Unoccupied
None No
Off Off High 0-v/Off 0-v/Off MIN POS Closed
On Off High 24-v/On 0-v/Off MIN POS Closed
On On High 24-v/On 24-v/On MIN POS Closed
None Yes
Off Off High 0-v/Off 0-v/Off MIN POS Closed
On Off High 0-v/Off 0-v/Off MIN POS to Full-Open Closed to Full-Open
On On High 24-v/On 0-v/Off* MIN POS to Full-Open Closed to Full-Open
* With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on second stage of mechanical cooling Y2 –O after the delay if the call for Y1---I and Y2---Ihave not been satisfied.
Table 17 – Enthalpy Operation No DCV (CO2 Sensor) -- 1 Speed Fan
DemandControlledVentilation(DCV)
Outside Air ---Good toeconomize?
Y1‐I Y2-I Fan Speed Y1-O Y2-O Occupied Unoccupied
Below set
No
Off Off High 0-v/Off 0-v/Off VENTMIN Closed
On Off High 24-v/On 0-v/Off VENTMIN Closed
On On High 24-v/On 24-v/On VENTMIN Closed
Yes
Off Off High 0-v/Off 0-v/Off VENTMIN Closed
On Off High 0-v/Off 0-v/Off VENTMIN to Full-Open Closed to Full-Open
On On High 24-v/On 0-v/Off* VENTMIN to Full-Open Closed to Full-Open
Above set
No
Off Off High 0-v/Off 0-v/Off VENTMIN to VENTMAX Closed
On Off High 24-v/On 0-v/Off VENTMIN L to VENTMAX Closed
On On High 24-v/On 24-v/On VENTMIN H to VENTMAX Closed
Yes
Off Off High 0-v/Off 0-v/Off VENTMIN L to VENTMAX Closed
On Off High 0-v/Off 0-v/Off VENTMIN to Full-Open Closed to Full-Open
On On High DELAY[24-v/On 0-v/Off* VENTMIN to Full-Open Closed to Full-Open
* With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on second stage of mechanical cooling Y2 –O after the delay if the call for Y1---I and Y2---Ihave not been satisfied.
[ With 2SP FAN DELAY (Advanced Setup Menu) when in the economizing mode there is a delay for the high speed fan to try to satisfy the call for secondstage cooling by turning on the fan to high and opening the OA damper 100% before the first stage mechanical cooling is enabled.
35
Table 18 – Dry Bulb Operation No DCV (CO2 Sensor) -- 2 Speed Fan
DemandControlledVentilation(DCV)
Outside Air ---Good toeconomize?
Y1‐I Y2-I Fan Speed Y1-O Y2-O Occupied Unoccupied
None No
Off Off Low 0-v/Off 0-v/Off MIN POS L Closed
On Off Low 24-v/On 0-v/Off MIN POS L Closed
On On High 24-v/On 24-v/On MIN POS H Closed
None Yes
Off Off Low 0-v/Off 0-v/Off MIN POS L Closed
On Off Low 0-v/Off 0-v/Off MIN POS L to Full-Open Closed to Full-Open
On On High DELAY[24-v/On 0-v/Off * MIN POS H to Full-Open Closed to Full-Open
* With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on second stage of mechanical cooling Y2 –O after the delay if the call for Y1---I and Y2---Ihave not been satisfied.
[ With 2SP FAN DELAY (Advanced Setup Menu) when in the economizing mode there is a delay for the high speed fan to try to satisfy the call for secondstage cooling by turning on the fan to high and opening the OA damper 100% before the first stage mechanical cooling is enabled.
Table 19 – Dry Bulb Operation With DCV (CO2 Sensor) -- 2 Speed Fan
DemandControlledVentilation(DCV)
Outside Air ---Good toeconomize?
Y1‐I Y2-I Fan Speed Y1-O Y2-O Occupied Unoccupied
Below set
No
Off Off Low 0-v/Off 0-v/Off VENTMIN L Closed
On Off Low 24-v/On 0-v/Off VENTMIN L Closed
On On High 24-v/On 24-v/On VENTMIN H Closed
Yes
Off Off Low 0-v/Off 0-v/Off VENTMIN L Closed
On Off Low 0-v/Off 0-v/Off VENTMIN L to Full-Open Closed to Full-Open
On On High 24-v/On 0-v/Off* VENTMIN H to Full-Open Closed to Full-Open
Above set
No
Off Off Low 0-v/Off 0-v/Off VENTMIN L to VENTMAX Closed
On Off Low 24-v/On 0-v/Off VENTMIN L to VENTMAX Closed
On On High 24-v/On 24-v/On VENTMIN H to VENTMAX Closed
Yes
Off Off Low 0-v/Off 0-v/Off VENTMIN L to VENTMAX Closed
On Off Low 0-v/Off 0-v/Off VENTMIN L to Full-Open Closed to Full-Open
On On High DELAY[24-v/On 0-v/Off * VENTMIN H to Full-Open Closed to Full-Open
* With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on second stage of mechanical cooling Y2 –O after the delay if the call for Y1---I and Y2---Ihave not been satisfied.
[ With 2SP FAN DELAY (Advanced Setup Menu) when in the economizing mode there is a delay for the high speed fan to try to satisfy the call for secondstage cooling by turning on the fan to high and opening the OA damper 100% before the first stage mechanical cooling is enabled.
36
Table 20 – Enthalpy Operation No DCV (CO2 Sensor) -- 2 Speed Fan
DemandControlledVentilation(DCV)
Outside Air ---Good toeconomize?
Y1‐I Y2-I Fan Speed Y1-O Y2-O Occupied Unoccupied
NO CO2 SENSOR
No
Off Off Low 0-v/Off 0-v/Off MIN POS L Closed
On Off Low 24-v/On 0-v/Off MIN POS L Closed
On On High 24-v/On 24-v/On MIN POS H Closed
Yes
Off Off Low 0-v/Off 0-v/Off MIN POS L Closed
On Off Low 0-v/Off 0-v/Off MIN POS L to Full-Open Closed to Full-Open
On On High DELAY[24-v/On 0-v/Off * MIN POS H to Full-Open Closed to Full-Open
* With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on second stage of mechanical cooling Y2 –O after the delay if the call for Y1---I and Y2---Ihave not been satisfied.
[ With 2SP FAN DELAY (Advanced Setup Menu) when in the economizing mode there is a delay for the high speed fan to try to satisfy the call for secondstage cooling by turning on the fan to high and opening the OA damper 100% before the first stage mechanical cooling is enabled.
Table 21 – Enthalpy Operation With DCV (CO2 Sensor) -- 2 Speed Fan
DemandControlledVentilation(DCV)
Outside Air ---Good toeconomize?
Y1‐I Y2-I Fan Speed Y1-O Y2-O Occupied Unoccupied
Below set
No
Off Off Low 0-v/Off 0-v/Off VENTMIN L Closed
On Off Low 24-v/On 0-v/Off VENTMIN L Closed
On On High 24-v/On 24-v/On VENTMIN H Closed
Yes
Off Off Low 0-v/Off 0-v/Off VENTMIN L Closed
On Off Low 0-v/Off 0-v/Off VENTMIN L to Full-Open Closed to Full-Open
On On High 24-v/On 0-v/Off* VENTMIN H to Full-Open Closed to Full-Open
Above set
No
Off Off Low 0-v/Off 0-v/Off VENTMIN L to VENTMAX Closed
On Off Low 24-v/On 0-v/Off VENTMIN L to VENTMAX Closed
On On High 24-v/On 24-v/On VENTMIN H to VENTMAX Closed
Yes
Off Off Low 0-v/Off 0-v/Off VENTMIN L to VENTMAX Closed
On Off Low 0-v/Off 0-v/Off VENTMIN L to Full-Open Closed to Full-Open
On On High DELAY[24-v/On 0-v/Off* VENTMIN H to Full-Open Closed to Full-Open
* With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on second stage of mechanical cooling Y2 –O after the delay if the call for Y1---I and Y2---Ihave not been satisfied.
[ With 2SP FAN DELAY (Advanced Setup Menu) when in the economizing mode there is a delay for the high speed fan to try to satisfy the call for secondstage cooling by turning on the fan to high and opening the OA damper 100% before the first stage mechanical cooling is enabled.
Enthalpy Settings
When the OA temperature, enthalpy and dew point arebelow the respective setpoints, the outdoor air can be usedfor economizing. Fig. 42 shows the new single enthalpyboundaries in the W7220. There are 5 boundaries(setpoints ES1 through ES5), which are defined by drybulb temperature, enthalpy and dew point.
Refer to Table 22 for ENTH CURVE setpoint values.
The W7220 calculates the enthalpy and dew point usingthe OA temperature and humidity input from the OAenthalpy sensor. When the OA temperature, OA humidityand OA dew point are all below the selected boundary, theeconomizer sets the economizing mode to YES,economizing is available.
When all of the OA conditions are above the selectedboundary, the conditions are not good to economize andthe mode is set to NO.
Fig. 42 shows the 5 current boundaries. There is also ahigh limit boundary for differential enthalpy. The highlimit boundary is ES1 when there are no stages of
mechanical cooling energized and HL (high limit) when acompressor stage is energized.
Table 22 provides the values for each boundary limit.
Two--Speed Fan Operation
The W7220 controller has the capability to work with asystem using a 2--speed supply fan. The W7220 does notcontrol the supply directly but uses the following inputstatus to determine the speed of the supply fan andcontrols the OA damper to the required position.
State Fan Speed
OCC Low
Y1 Low
Y2 High
W High
The W (heating mode) is not controlled by the W7220 butit requires the status to know where to position the OAdamper for minimum position for the fan speed.
37
TEMPERATURE
ENTHALPY
RA
TEM
P AB
SO
LUTE
HU
MID
ITY
ECONOMIZING
AVAILABLE
NOT AVAILABLE
ES5 ES4 ES3 ES2 ES1 HL
DUAL ENTHALPYHIGH LIMIT
SINGLE ENTHALPY
P2 (T,RH)
P1(T,RH)
RA HUM (%RH)
a50---9997
Fig. 42 -- Single Enthalpy Curve and Boundaries
Table 22 – Single Enthalpy and Dual Enthalpy High Limit Curves (EN Units)
EnthalpyCurve
Temp.Dry---Bulb (_F)
Temp.Dewpoint (_F)
Enthalpy(btu/lb/da)
Point P1 Point P2
Temp. (_F) Humidity %RH Temp. (_F) Humidity %RH
ES1 80.0 60.0 28.0 80.0 36.8 66.3 80.1
ES2 75.0 57.0 26.0 75.0 39.6 63.3 80.0
ES3 70.0 54.0 24.0 70.0 42.3 59.7 81.4
ES4 65.0 51.0 22.0 65.0 44.8 55.7 84.2
ES5 60.0 48.0 20.0 60.0 46.9 51.3 88.5
HL 86.0 66.0 32.4 86.0 38.9 72.4 80.3
The 2 speed fan delay is available when the system isprogrammed for 2 speed fan (in the System Setup menuitem). The 2 speed fan delay is defaulted to 5 minutes andcan be changed in the Advanced Setup menu item. Whenthe unit has a call for Y1 In and in the free cooling modeand there is a call for Y2 In, the 2--speed fan delay startsand the OA damper will modulate 100% open, the supplyfan should be set to high speed by the unit controller.
After the delay one of two actions will happen:
S The Y2 In call will be satisfied with the damper 100%open and fan on high speed and the call will turn off
OR
S If the call for additional cooling in the space has notbeen satisfied then the first stage of mechanical coolingwill be enabled through Y1 Out or Y2 Out.
Checkout
Inspect all wiring connections at the economizer module’sterminals, and verify compliance with the installationwiring diagrams.
For checkout, review the Status of each configuredparameter and perform the Checkout tests.
NOTE: See “Interface Overview” on page 26 forinformation about menu navigation and use of the keypad.
ELECTRICAL SHOCK HAZARDFailure to follow this warning could cause personalinjury, death or property damage.
Before performing service or maintenance operationson unit, always turn off main power switch to unit andinstall lock(s) and lockout tag(s). Unit may have morethan one power switch. Ensure electrical service torooftop unit agrees with voltage an amperage listed onthe unit rating plate.
If any wiring changes are required, first be sure toremove power from the economizer module beforestarting work. Pay particular attention to verifying thepower connection (24 Vac).
! WARNING
Power Up —
After the W7220 module is mounted and wired, applypower.
Initial Menu Display —
On initial start up, Honeywell displays on the first lineand Economizer W7220 on the second line. After a briefpause, the revision of the software appears on the first lineand the second line will be blank.
38
Power Loss (Outage or Brownout) —
All setpoints and advanced settings are restored* after anypower loss or interruption.
* All settings are stored in non---volatile flash memory.
Status —
Use the Status menu (see Table 12) to check the parametervalues for the various devices and sensors configured.
NOTE: See “Interface Overview” on page 26 forinformation about menu navigation and use of the keypad.
Checkout Tests —
Use the Checkout menu (on page 31) to test the damperoperation and any configured outputs. Only items that areconfigured are shown in the Checkout menu.
NOTE: See “Interface Overview” on page 26 forinformation about menu navigation and use of the keypad.
To perform a Checkout test:
1. Scroll to the desired test in the Checkout menu usingthe the and buttons.
2. Press the button to select the item.3. RUN? appears.4. Press the button to start the test.5. The unit pauses and then displays IN PROGRESS.6. When the test is complete, DONE appears.7. When all desired parameters have been tested, pressthe (Menu up) button to end the test.
The Checkout tests can all be performed at the time ofinstallation or at any time during the operation of the systemas a test that the system is operable.
EQUIPMENT DAMAGE HAZARDFailure to follow this caution may result in equipmentdamage.
Be sure to allow enough time for compressor startupand shutdown between checkout tests so that you donot short--cycle the compressors.
CAUTION!
Troubleshooting
Alarms —
The economizer module provides alarm messages thatdisplay on the 2--line LCD.
NOTE: Upon power up, the module waits 60 minutesbefore checking for alarms. This allows time for all theconfigured devices (e.g. sensors, actuator) to becomeoperational. The exception is the SAT sensor which willalarm immediately.
If one or more alarms are present and there has been nokeypad activity for at least 5 minutes, the Alarms menudisplays and cycles through the active alarms.
You can also navigate to the Alarms menu at any time.
Clearing Alarms —
Once the alarm has been identified and the cause has beenremoved (e.g. replaced faulty sensor), the alarm can becleared from the display.
To clear an alarm, perform the following:
1. Navigate to the desired alarm.2. Press the button.3. ERASE? displays.4. Press the button.5. ALARM ERASED displays.6. Press the (Menu up/Exit) button to complete theaction and return to the previous menu.
NOTE: If the alarm still exists after you clear it, it isredisplayed within 5 seconds.
2--Speed Indoor Fan Control System with VariableFrequency Drive (Factory--Installed Option)
For details on operating 549J 2--stage cooling units equippedwith the factory--installed 2--speed indoor fan control systemoption, refer to the Variable Frequency Drive (VFD)Installation, Start--Up and Service Instructions.
39
RTU Open Controller System
The RTU Open controller is factory--mounted in the 549Junit’s main control box (see Fig. 44), to the left of theCTB. Factory wiring is completed through harnessesconnected to the CTB. Field connections for RTU Opencontroller sensors will be made at the PCB connectors onthe RTU Open controller board. The factory--installedRTU Open controller includes the supply--air temperature(SAT) sensor. The outdoor air temperature (OAT) sensor isincluded in the FIOP/accessory EconoMi$er2 package.
The RTU Open controller is an integrated component of theBryant rooftop unit. Its internal application programming
provides optimum performance and energy efficiency. TheRTU Open controller enables the unit to run in 100%stand--alone control mode, or a Third Party BuildingAutomation System (BAS). On--board DIP switches allowyou to select your protocol (and baud rate) of choice amongthe four most popular protocols in use today: BACnet*,Modbus{, Johnson N2 and LonWorks**. (See Fig. 43.)
Refer to Table 23, RTU Open Controller Inputs andOutputs for locations of all connections to the RTU Opencontroller board.
NOTE: The RTU Open controller acts as an intelligentimbedded thermostat. A room thermostat cannot be usedwith the RTU Open controller.
J4J2J1
J5 J5
J22
J17
J19 J14
J11
J22
J3
J13
J12
J15J20
Network Comm
Configurable - Input_8
24 VAC
Configurable - Input_5
24 VAC
Configurable - Input_3
24 VAC
Input_9 (Hum
idistat)24 VA
C
24 VAC
Input _8 (Enthalpy)A
O-1 (EC
ON
)G
nd(O
AT)G
nd(SAT)
Input_5 (SMK
)
Input_4 (R)
B
O-5 (Y1)
B
O-4 (Y2)
B
O-3 (W
1)
BO
-2 (W2)
B
O-1 (G
)
Gnd
Input_3 (X)
24 VA
C IN
+24 VDC
Input_2 (CO
2/RH
)G
nd+24 VD
CInput_1 (C
O2/R
H)
Gnd
Board Power
(AO-1)
0-10VDC
4-20mA
BO-6(H) DehumidificationBO-7 (Reversing Valve/High Speed Fan/Y3)
BO-8(Power Exhaust)
LonWorksOption CardPort
Example set forBACnet MS/TPand 76.8K baud(1, 2, and 4 ON)
Protocol Selector SPT (temp input) BACnet, Modbus, or N2(LON connection J15)SPT (common)
SPT (offset input)
*Removeboth for 0-5V
AO-2GND
(2-10V)
3-VoltLithiumBattery
BO-1 BO-2 BO-3 BO-4 BO-5
BO-6
BO-7
BO-8
VFD Output
C14162Fig. 43 -- RTU Open Controller Multi--Protocol Control Board
* BACnet is a registered trademark of ASHRAE (American Society ofHeating, Refrigerating and Air---Conditioning Engineers).
{ Modbus is a registered trademark of Schneider Electric.** LonWorks is a registered trademark of Echelon Corporation.
40
a549J---001Fig. 44 -- Typical RTU Open Controller Wiring Diagram
41
Table 23 – RTU Open Controller Inputs and Outputs
POINT NAME BACnet OBJECTNAME TYPE OF I/O CONNECTION
PIN NUMBER(S) CHANNEL DESIGNATION
DEDICATED INPUTS
Space Temp / Zone Temp zone_temp AI (10K Thermistor) J20---1 and 2 Analog Input 10
Supply Air Temperature sa_temp AI (10K Thermistor) J2---1 and 2 Analog Input 6
Outside Air Temperature oa_temp AI (10K Thermistor) J2---3 and 4 Analog Input 7
Space Temperature Offset Pot stpt_adj_offset AI (100K Potentiometer) J20---3 and 4 Analog Input 11
Safety Chain Feedback safety_status BI (24 VAC) J1---9 Binary Input 4
Compressor Safety Status (1) comp_status BI (24 VAC) J1---2 Binary Input 3
Fire Shutdown Status firedown_status BI (24 VAC) J1---10 Binary Input 5
Enthalpy Status enthalpy_status BI (24 VAC) J2---6 and 7 Binary Input 8
Humidistat Input Status humstat_status BI (24 VAC) J5---7 and 8 Binary Input 9
Zone Temperature n/a n/a J13---1---4 Rnet
CONFIGURABLE INPUTS (4)
Indoor Air CO2 iaq AI (4---20 mA)
J4---2 and 3 or J4---5 and 6
Analog Input 2
Outdoor Air CO2 oaq AI (4---20 mA) Analog Input 1
Space Relative Humidity space_rh AI (4---20 mA) Analog Input 10
Supply Fan Status (2) sfan_status BI (24 VAC)
J5---1 and 2 or J5---3 and 4,J5---5 and 6 or J5---7 and 8 (3)
Binary Input 3, 5, 8, or 9, except where intrinsic input is used
Filter Status (2) filter_status BI (24 VAC) Binary Input 3, 5, 8, or 9, except where intrinsic input is used
Door Contact (2) door_contact_status BI (24 VAC) Binary Input 3, 5, 8, or 9, except where intrinsic input is used
Remote Occupancy input (2) occ_contact_status BI (24 VAC) Binary Input 3, 5, 8, or 9, except where intrinsic input is used
IGC input (2) igcovr_status BI (24 VAC) Binary Input 9. Mandatory input on gas heat units.
OUTPUTS
Economizer Output econ_output AO (4---20mA) J2---5 Analog Output 1
Supply Fan VFD vfd_output AO (2---10Vdc) J22---1 and 2 Analog Output 2
Supply Fan Relay sfan BO Relay (24VAC, 1A) J1---4 Binary Output 1 (G)
Cool 1 Relay State comp_1 BO Relay (24VAC, 1A) J1---8 Binary Output 5 (Y1)
Cool 2 Relay State comp_2 BO Relay (24VAC, 1A) J1---7 Binary Output 4 (Y2)
Cool 3 Relay State comp_3 BO Relay (24VAC, 1A) J11---5 and 6 Binary Output 7 (Y3)
Heat 1 Relay State heat_1 BO Relay (24VAC, 1A) J1---6 Binary Output 3 (W1)
Heat 2 Relay State heat_2 BO Relay (24VAC, 1A) J1---5 Binary Output 2 (W2)
Power Exhaust Relay State pexh BO Relay (24VAC, 1A) J11---2 and 3 (N.O.) Binary Output 8 (PE)
Dehumidification Relay dehum BO Relay (24VAC, 1A) J11---7 and 8 (N.O.) Binary Output 6
LEGENDAI --- Analog InputAO --- Analog OutputBI --- Binary InputBO --- Binary Output(1)Safety Chain Feedback: 24Vac required at this terminal to provide “Run Enable” status. See Input/Output section for additional instructions.(2)These inputs are configurable. If installed, they take the place of the default input on the specific channel. See appropriate Input Configuration Section for wiring and setup instructions.(3)Parallel pins J5---1 = J2---6, J5---3 = J1---10, J5---5 = J1---2 are used for field installation.(4)Refer to the input configuration and accessory sections of the RTU Open Multi ---Protocol Controller Controls, Start ---Up, Operation and Troubleshooting manual for more detail.
The RTU Open controller requires the use of a Bryant spacesensor. A standard thermostat cannot be used with the RTUOpen controller system.
Supply Air Temperature (SAT) Sensor —
On FIOP--equipped 549J unit, the unit is supplied with asupply--air temperature (SAT) sensor (33ZCSENSAT).This sensor is a tubular probe type, approx 6--in. (152 mm)in length. It is a nominal 10--k ohm thermistor.
The SAT is factory--wired. The SAT probe is wire--tied tothe supply--air opening (on the horizontal opening end) inits shipping position. Remove the sensor for installation.Re--position the sensor in the flange of the supply--airopening or in the supply air duct (as required by localcodes). Drill or punch a 1/2--in. hole in the flange or duct.Use two field--supplied, self--drilling screws to secure thesensor probe in a horizontal orientation. See Fig. 45.
Outdoor Air Temperature (OAT) Sensor —
The OAT is factory--mounted in the EconoMi$er2 (FIOPor accessory). It is a nominal 10k ohm thermistor attachedto an eyelet mounting ring.
SUPPLY AIR RETURN AIR
SUPPLY AIRTEMPERATURESENSOR
ROOFCURB
C08200
Fig. 45 -- Typical Mounting Location for Supply AirTemperature (SAT) Sensor on Small Rooftop Units
42
EconoMi$er 2 —
The RTU Open controller is used with EconoMi$er2(option or accessory) for outdoor air management. Thedamper position is controlled directly by the RTU Opencontroller; EconoMi$er2 has no internal logic device.
Outdoor air management functions can be enhanced withfield--installation of these accessory control devices:
Enthalpy control (outdoor air or differential sensors)Space CO2 sensorOutdoor air CO2 sensor
Field Connections
Field connections for accessory sensors and input devicesare made to the RTU Open controller at plugs J1, J2, J4,J5, J11 and J20. All field control wiring that connects tothe RTU Open controller must be routed through theraceway built into the corner post as shown in Fig. 31.The raceway provides the UL required clearance betweenhigh-- and low--voltage wiring. Pass the control wiresthrough the hole provided in the corner post, then feed thewires through the raceway to the RTU Open controller.Connect to the wires to the removable PCB connectorsand then reconnect the connectors to the board.
Space Temperature (SPT) Sensors —
SPT sensors available from Bryant are resistive inputnon-communicating (T55, T56, and T59) sensors. Thesesensors have a variety of options consisting of: timedoverride button, set point adjustment, and a LCD screen.Space temperature can be also be written to from abuilding network or zoning system. However, it is stillrecommended that return air duct sensor be installed toallow stand-alone operation for back-up. Refer to theconfiguration section for details on controllerconfigurations associated with space sensors.S 33ZCT55SPT, space temperature sensor with overridebutton
S 33ZCT56SPT, space temperature sensor with overridebutton and setpoint adjustment
S 33ZCT59SPT, space temperature sensor with LCD(liquid crystal display) screen, override button, andsetpoint adjustment
Use 20 gauge wire to connect the sensor to the controller.The wire is suitable for distances of up to 500 ft. Use athree--conductor shielded cable for the sensor and setpointadjustment connections. If the setpoint adjustment(slidebar) is not required, then an unshielded, 18 or 20gauge, two--conductor, twisted pair cable may be used.
Connect T--55: See Fig. 46 for typical T--55 internalconnections. Connect the T--55 SEN terminals to the RTUOpen controller at J20--1 and J20--2. See Fig. 47.
2 3 4 5 61
SW1
SEN
BRN (GND)BLU (SPT)
RED(+)WHT(GND)
BLK(-) CCN COM
SENSOR WIRING
C08201Fig. 46 -- T--55 Space Temperature Sensor Wiring
SEN
SEN
J20-1
J20-2
C08460Fig. 47 -- RTU Open Controller T--55 Sensor
Connections
Connect T--56: See Fig. 48 for T--56 internal connections.Install a jumper between SEN and SET terminals asillustrated. Connect T--56 terminals to the RTU Opencontroller at J20--1, J20--2 and J20--3 per Fig. 49.
2 3 4 5 61
SW1
SEN SET
Cool Warm
BRN (GND)BLU (SPT)
RED(+)WHT(GND)
BLK(-) CCN COM
SENSOR WIRING
JUMPERTERMINALSAS SHOWN
BLK(T56)
C08202Fig. 48 -- T--56 Internal Connections
SEN J20-1
J20-2SEN
SET
Jumper
J20-3SETC08461
Fig. 49 -- RTU Open Controller T--56 SensorConnections
43
Connect T--59: The T--59 space sensor requires aseparate, isolated power supply of 24 VAC. See Fig. 50for internal connections at the T--59. Connect the SENterminal (BLU) to the RTU Open controller at J20--1.Connect the COM terminal (BRN) to J20--2. Connect theSET terminal (STO or BLK) to J20--3.
OR SET SEN
OPB COM- PWR+
BLU (SPT)
BLK (STO)
24 VAC
SENSORWIRING
POWERWIRING
BRN (COM)
NOTE: Must use a separate isolated transformer.
J20-3
J20-2
J20-1
C10291
Fig. 50 -- Space Temperature Sensor Typical Wiring(33ZCT59SPT)
Indoor Air Quality (CO2) Sensor —
The indoor air quality sensor accessory monitors spacecarbon dioxide (CO2) levels. This information is used tomonitor IAQ levels. Several types of sensors are available,for wall mounting in the space or in return duct, with andwithout LCD display, and in combination with spacetemperature sensors. Sensors use infrared technology tomeasure the levels of CO2 present in the space air.
The CO2 sensors are all factory set for a range of 0 to2000 ppm and a linear mA output of 4 to 20. Refer to theinstructions supplied with the CO2 sensor for electricalrequirements and terminal locations. See Fig. 51 fortypical CO2 sensor wiring schematic.
To accurately monitor the quality of the air in theconditioned air space, locate the sensor near a return--airgrille (if present) so it senses the concentration of CO2leaving the space. The sensor should be mounted in alocation to avoid direct breath contact.
Do not mount the IAQ sensor in drafty areas such as nearsupply ducts, open windows, fans, or over heat sources.Allow at least 3 ft (0.9 m) between the sensor and anycorner. Avoid mounting the sensor where it is influencedby the supply air; the sensor gives inaccurate readings ifthe supply air is blown directly onto the sensor or if thesupply air does not have a chance to mix with the room airbefore it is drawn into the return airstream.
8 7 6 5 4 3 2 12 1
H G 24 VACOR
24 VDC
NC ALARMRELAYCONTACTS
COMNO }
0-10VDCSIG COM4-20mA
+
+-
+ -
J3 J4
C08635
Fig. 51 -- Indoor/Outdoor Air Quality (CO2) Sensor(33ZCSENCO2) -- Typical Wiring Diagram
Wiring the Indoor Air Quality Sensor: For each sensor,use two 2--conductor 18 AWG (American Wire Gage)twisted--pair cables (unshielded) to connect the separateisolated 24 vac power source to the sensor and to connectthe sensor to the control board terminals.
To connect the sensor to the control, identify the positive(4 to 20 mA) and ground (SIG COM) terminals on thesensor. See Fig. 51. Connect the 4--20 mA terminal to theRTU Open controller at J4--2 and connect the SIG COMterminal the RTU Open controller at J4--3. See Fig. 52.
SEN
COM
J4-2
J4-3
IAQ Sensor
24 VACC08462
Fig. 52 -- RTU Open Controller / Indoor CO2 Sensor(33ZCSENCO2) Connections
44
Outdoor Air Quality Sensor(P/N 33ZCSENCO2 plus weatherproof enclosure) —
The outdoor air CO2 sensor is designed to monitor carbondioxide (CO2) levels in the outside ventilation air andinterface with the ventilation damper in an HVAC system.The OAQ sensor is packaged with an outdoor cover. SeeFig. 53. The outdoor air CO2 sensor must be located in theeconomizer outside air hood.
COVER REMOVED SIDE VIEW
C07135
Fig. 53 -- Outdoor Air Quality Sensor Cover
Wiring the Outdoor Air CO2 Sensor: A dedicatedpower supply is required for this sensor. A two--wire cableis required to wire the dedicated power supply for thesensor. The two wires should be connected to the powersupply and terminals 1 and 2.
To connect the sensor to the control, identify the positive(4 to 20 mA) and ground (SIG COM) terminals on theOAQ sensor. See Fig. 51. Connect the 4 to 20 mAterminal to the RTU Open controller at J4--5. Connect theSIG COM terminal to the RTU Open controller at J4--6.
SEN
COM
J4-5
J4-6
OAQ Sensor/RH Sensor
24 VACC08463
Fig. 54 -- RTU Open Controller / Outdoor CO2 Sensor(33ZCSENCO2) Connections
Space Relative Humidity Sensor or Humidistat —
The Space Relative Humidity Sensor is not used with 549Junits at this time.
Smoke Detector/Fire Shutdown (FSD) —
On 549J units equipped with factory--installed SmokeDetector(s), the smoke detector controller implements theunit shutdown through its NC contact set connected to theunit’s CTB input. The FSD function is initiated via thesmoke detector’s Alarm NO contact set. The RTU Opencontroller communicates the smoke detector’s trippedstatus to the BAS building control. See Fig. 44 (TypicalRTU Open controller wiring diagram).
The Fire Shutdown Switch configuration,MENUConfigInputsinput 5, identifies the normallyopen status of this input when there is no fire alarm.
Connecting Discrete Inputs —
Filter Status: The filter status accessory is a field--installedaccessory. This accessory detects plugged filters. Wheninstalling this accessory, the unit must be configured forfilter status by settingMENUConfigInputsinput 3, 5,8, or 9 to Filter Status and normally open (N/O) or normallyclosed (N/C). Input 8 or 9 is recommended for easy ofinstallation. Refer to Fig. 43 and Fig. 44 for wireterminations at J5.
Fan Status: The fan status accessory is a field--installedaccessory. This accessory detects when the indoor fan isblowing air. When installing this accessory, the unit must beconfigured for fan status by settingMENUConfigInputsinput 3, 5, 8, or 9 to Fan Statusand normally open (N/O) or normally closed (N/C). Input 8or 9 is recommended for easy of installation. Refer to Fig.43 and Fig. 44 for wire terminations at J5.
Remote Occupancy: The remote occupancy accessory isa field--installed accessory. This accessory overrides theunoccupied mode and puts the unit in occupied mode.When installing this accessory, the unit must beconfigured for remote occupancy by settingMENUConfigInputsinput 3, 5, 8, or 9 to RemoteOccupancy and normally open (N/O) or normally closed(N/C).
Also set MENUSchedulesoccupancy source to DIon/off. Input 8 or 9 is recommended for ease ofinstallation. Refer to Fig. 43 and Table 23 for wireterminations at J5.
Power Exhaust (output): The relay used by the RTUOpen controller board to control power exhaust is a drycontact which means it does not have 24vac. This 24vacmust be connected to the relay to allow it to operate thepower exhaust relay in the PE accessory. A 24vac sourcemust be provided to J11--2 on the RTU Open controllerboard. This can be provided by the unit’s transformer fromvarious sources. The “R” terminal on the unit’s centralterminal board (CTB) is a logical source. Refer to Fig. 43and Fig. 44 for wire terminations at J11.
45
Communication Wiring -- Protocols
General —
Protocols are the communication languages spoken bycontrol devices. The main purpose of a protocol is tocommunicate information in the most efficient methodpossible. Different protocols exist to provide differentkinds of information for different applications. In the BASapplication, many different protocols are used, dependingon manufacturer. Protocols do not change the function ofa controller; just make the front end user different.The RTU Open controller can be set to communicate onfour different protocols: BACnet, Modbus, N2, and
LonWorks. Switch 3 (SW3) on the board is used to setprotocol and baud rate. Switches 1 and 2 (SW1 and SW2)are used to set the board’s network address. See Fig. 55and 56 for protocol switch settings and address switches.The third party connection to the RTU Open controller isthrough plug J19. See Fig. 57 for wiring.NOTE: Power must be cycled after changing the SW1--3switch settings.Contact your Bryant applications engineer for moredetailed information on protocols, third party wiring, andnetworking.
SW3 Protocol Selection
PROTOCOL DS8 DS7 DS6 DS5 DS4 DS3 DS2 DS1BACnet MS/TP(Master) Unused OFF OFF OFF ON OFF Select Baud Select Baud
Modbus(Slave) Unused OFF OFF ON ON OFF Select Baud Select Baud
N2(Slave) Unused OFF OFF OFF ON ON OFF OFF
LonWorks Unused ON ON OFF ON OFF OFF ON
NOTE:DS = Dip SwitchBACnet MS/TP SW3 example shown
Baud Rate Selections
BAUD RATE DS2 DS19600 OFF OFF
19,200 ON OFF
38,400 OFF ON
76,800 ON ONC07166
Fig. 55 -- RTU Open Controller SW3 Dip Switch Settings
C10815
Fig. 56 -- RTU Open Controller Address Switches
C10816Fig. 57 -- Network Wiring
46
Local Access
Wall Mounted Equipment Toucht Interface: TheEquipment Touch interface is a wall mounted interfaceused to connect to the RTU Open controller to access thecontrol information, read sensor values, and maintenance.This is an accessory interface that does not come with theRTU Open controller. You wire the Equipment Touchinterface to the RTU Open controller’s J13 local accessport. There are 2 password protected levels in the display(User and Admin). See the Equipment Touch Installationand Setup Guide for more information. See Appendix Aof the guide for navigation and screen content.
Field Assistant: Field Assistant is a computer programincluded with the purchase of the Tech Tool Kit(USB-TKIT). This is a field Tech Tool to set-up, service, or
download application software to the RTU Open controllerand includes a USB Link Cable. The link cable connects aUSB port to the J12 local access port. See Fig. 58.
RTU Open Controller Troubleshooting —
Communication LEDs: The LEDs indicate if thecontroller is speaking to the devices on the network. TheLEDs should reflect communication traffic based on thebaud rate set. The higher the baud rate the more solid theLEDs will appear. See Table 24.
NOTE: Refer to the RTU Open Multi--Protocol ControllerControls, Start--Up, Operation and Troubleshooting manualfor complete configuration of the RTU Open controlleroperating sequences and troubleshooting informationContact your Bryant applications engineer for details onconfiguration and troubleshooting of connected networks.
Connect tocomputer’sUSB port
Connect tothe Local
Access portUSB Link Kit RTU Open Controller
AccessPort
J12
P1 P1
P5 P5 LOCALACCESS
PORT
GN
D
GN
D
*Thermm
A
*Thermm
A
UI-10UI-11
SW3
on
CO
MM
OP
TIO
N
CR2032
+-
SW1 SW2
MSB LSB
TXRX
+12 DVCRnet-Rnet+GND
RNET
J12
J13
J15J20
C14131
Fig. 58 -- PC Running Field Assistant
47
Table 24 – LEDsThe LEDs on the RTU Open Controller show the status of certain functions
If this LED is on... Status is...Power The RTU Open controller has powerRx The RTU Open controller is receiving data from the network segmentTx The RTU Open controller is transmitting data over the network segmentBO# The binary output is active
The Run and Error LEDs indicate control module and network status
If Run LED shows... And Error LED shows... Status is...2 flashes per second Off Normal2 flashes per second 2 flashes, alternating with Run LED Five minute auto---restart delay after system error2 flashes per second 3 flashes, then off Control module has just been formatted2 flashes per second 4 flashes, then pause Two or more devices on this network have the
same MSTP network address2 flashes per second On Exec halted after frequent system errors or
control programs halted5 flashes per second On Exec start---up aborted, Boot is running5 flashes per second Off Firmware transfer in progress, Boot is running7 flashes per second 7 flashes per second, alternating
with Run LEDTen second recovery period after brownout
14 flashes per second 14 flashes per second,alternating with Run LED
Brownout
On On Failure. Try the following solutions:S Turn the RTU Open controller off, then on.S Format the RTU Open controller.S Download memory to the RTU Open controller.S Replace the RTU Open controller.
Outdoor Air Enthalpy Control(P/N 33CSENTHSW)
The enthalpy control (33CSENTHSW) is available as afield--installed accessory to be used with the EconoMi$er2damper system. The outdoor air enthalpy sensor is part ofthe enthalpy control. (The separate field--installedaccessory return air enthalpy sensor (33CSENTSEN) isrequired for differential enthalpy control. See Fig. 59.)
7 CTB ECON(RTU Open: to J2-6)LOW
GND
24V
EnthalpySwitch
GRA
BLK
RED
Factory Wiring Harness
PL6-1 (24-V)
PL6-4 (COM)
C11169
Fig. 59 -- Enthalpy Switch (33CSENTHSW) Connections
Locate the enthalpy control in the economizer next to theActuator Motor. Locate two GRA leads in the factoryharness and connect the gray lead labeled “ESL” to theterminal labeled “LOW”. See Fig. 59. Connect theenthalpy control power input terminals to economizeractuator power leads RED (connect to 24V) and BLK(connect to GND).
The outdoor enthalpy changeover setpoint is set at theenthalpy controller.
Differential Enthalpy Control —
Differential enthalpy control is provided by sensing andcomparing the outside air and return air enthalpyconditions. Install the outdoor air enthalpy control asdescribed above. Add and install a return air enthalpysensor.
Return Air Enthalpy Sensor —
Mount the return--air enthalpy sensor (33CSENTSEN) inthe return--air section of the economizer. The return airsensor is wired to the enthalpy controller(33CSENTHSW). See Fig. 60.
GRA
BLK
RED– 4-20 Main
+ VDC Out
– 4-20 Main Out
+ 24-36 VDC In
LOW
GND
24V
7 CTB ECON(RTU Open: to J2-6)
PL6-1 (24-V)
PL6-4 (COM)
Outside AirEnthalpy Switch
Return AirEnthalpySensor
C11170
Fig. 60 -- Outside and Return Air Enthalpy SensorWiring
48
Smoke Detectors
Smoke detectors are available as factory--installed options on549J models. Smoke detectors may be specified for SupplyAir only or for Return Air without or with economizer or incombination of Supply Air and Return Air. All componentsnecessary for operation are factory--provided and mounted.The unit is factory--configured for immediate smoke detectorshutdown operation; additional wiring or modifications tounit terminal board may be necessary to complete the unitand smoke detector configuration to meet projectrequirements.
Units equipped with factory--optional Return Air smokedetectors require a relocation of the sensor module at unitinstallation. See Fig. 61 for the as shipped location.
Return Air Smoke Detector(as shipped)
C12282
Fig. 61 -- Return Air Smoke Detector, Shipping Position
Completing Installation of Return Air Smoke Sensor:1. Unscrew the two screws holding the Return AirSmoke Detector assembly. See Fig. 62, Step 1. Savethe screws.
2. Turn the assembly 90 degrees and then rotate end toend. Make sure that the elbow fitting is pointingdown. See Fig. 62, Step 2.
3. Screw the sensor and detector plate into its operatingposition using screws from Step 1. See Fig. 62, Step 3.
4. Connect the flexible tube on the sampling inlet to thesampling tube on the basepan.
Additional Application Data —
Refer to the Application Data sheet titled FactoryInstalled Smoke Detectors For Small And MediumRooftop Units 2 to 25 Tons for discussions on additionalcontrol features of these smoke detectors includingmultiple unit coordination.
Step 11 — Adjust Factory--Installed Options
Smoke Detectors: Smoke detector(s) will be connected atthe Controls Connections Board, at terminals marked“Smoke Shutdown”. Remove jumper JMP 3 when readyto energize unit.
EconoMi$erR IV Occupancy Switch: Refer to Fig. 63for general EconoMi$er IV wiring. External occupancycontrol is managed through a connection on the CentralTerminal Board.
If external occupancy control is desired, connect a timeclock or remotely controlled switch (closed for Occupied,open for Unoccupied sequence) at terminals markedOCCUPANCY on CTB. Remove or cut jumper JMP 2 tocomplete the installation.
Step 1 Step 2 Step 3C12283
Fig. 62 -- Completing Installation of Return Air Smoke Sensor
49
Economizer 2 Position Damper Unit Without Economizeror 2 Position Damper
C160126
Fig. 63 -- EconoMi$erR IV Wiring
Step 12 — Install Accessories
Available accessories include:
Roof curbThru--base connection kit (must be installed before unitis set on curb)Manual outside air damperTwo--position motorized outside air damperEconoMi$er IV (with control and integrated barometricrelief)EconoMi$er 2 (without control/for external signal andintegrated barometric relief)Power exhaustDifferential dry--bulb sensor (EconoMi$er IV)Outdoor enthalpy sensorDifferential enthalpy sensorElectric heatersSingle point kitsCO2 sensorLouvered hail guardPhase monitor control
Refer to separate installation instructions for informationon installing these accessories.
Step 13 — Check Belt Tension
Measure the belt span length as shown in Fig. 64.Calculate the required deflection by multiplying the belt
span length by 1/64. For example, if the belt span lengthis 32 inches: 32 x 1/64 = 1/2 inch deflection.
Belt Force -- Deflection Method --
Check the belt tension with a spring--force belt forcedeflection gauge.
1. Place a straightedge along the belt between the twopulleys. Measure the distance between the motor shaftand the blower shaft.
2. Set the tension gauge to the desired tension (see Table 1in Fig. 64). Place the large O--ring at that point.
3. Press the tension checker downward on the belt untilthe large O--ring is at the bottom of the straightedge.
4. Adjust the belt tension as needed.
Adjust belt tension by loosing the motor mounting platefront bolts and rear bolt (see Fig. 65) and sliding the platetowards the fan (to reduce tension) or away from the fan(to increase tension). Ensure the blower shaft and motorshaft are parallel to each other (pulleys aligned). Tightenall bolts securely when finished.
Pre--Start and Start--Up
This completes the mechanical installation of the unit.Refer to the unit’s Service Manual for detailed Pre--Startand Start--Up instructions. Download the latest versionsfrom HVAC Partners (www.hvacpartners.com).
50
C160146
Fig. 64 -- V--Belt Force Label
BLOWER PULLEY
V-BELT
MOTOR PULLEY
MOTOR
MOTOR MOUNTINGPLATE
MOUNTINGBOLTS (4)
C11504
Fig. 65 -- Belt Drive Motor Mounting
Copyright 2018 Bryant Heating & Cooling Systems Edition Date: 01/18 Printed in U.S.A.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Catalog No: II549J---7---9---04
Replaces: II549J---7---9---03
51
UNIT START-UP CHECKLIST(Remove and Store in Job File)
NOTE: To avoid injury to personnel and damage to equipment or property whencompleting the procedures listed in this start---up checklist, use good judgement,follow safe practices, and adhere to the safety considerations/information asoutlined in the preceding sections of this Installation Instructions document.
MODEL NO.: SERIAL NO.:
I. PRE-START-UPj VERIFY THAT ALL PACKAGING MATERIALS HAVE BEEN REMOVED FROM UNIT
j VERIFY INSTALLATION OF OUTDOOR AIR HOOD
j VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTRUCTIONS
j VERIFY THAT ALL ELECTRICAL CONNECTIONS AND TERMINALS ARE TIGHT
j CHECK THAT INDOOR--AIR FILTERS ARE CLEAN AND IN PLACE
j CHECK THAT OUTDOOR AIR INLET SCREENS ARE IN PLACE
j VERIFY THAT UNIT IS LEVEL
j CHECK FAN WHEELS AND PROPELLER FOR LOCATION IN HOUSING/ORIFICE AND VERIFYSETSCREW IS TIGHT
j VERIFY THAT FAN SHEAVES ARE ALIGNED AND BELTS ARE PROPERLY TENSIONED
j VERIFY THAT SCROLL COMPRESSORS ARE ROTATING IN THE CORRECT DIRECTION
j VERIFY INSTALLATION OF THERMOSTAT
II. START-UPCOOLING CYCLE --ELECTRICAL
SUPPLY VOLTAGE L1--L2 L2--L3 L3--L1
COMPRESSOR AMPS 1 L1 L2 L3
COMPRESSOR AMPS 2 L1 L2 L3
SUPPLY FAN AMPS L1 L2 L3
TEMPERATURES
OUTDOOR--AIR TEMPERATURE _F DB (DRY BULB)
RETURN--AIR TEMPERATURE _F DB _F WB (WET BULB)
COOLING SUPPLY AIR TEMPERATURE _F
PRESSURES
REFRIGERANT SUCTION CIRCUIT A PSIG
CIRCUIT B PSIG
REFRIGERANT DISCHARGE CIRCUIT A PSIG
CIRCUIT B PSIG
j VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS
HEATING CYCLE --
ELECTRICAL
SUPPLY VOLTAGE L1--L2 L2--L3 L3--L1
COMPRESSOR AMPS 1 L1 L2 L3
COMPRESSOR AMPS 2 L1 L2 L3
SUPPLY FAN AMPS L1 L2 L3
52
TEMPERATURES
OUTDOOR--AIR TEMPERATURE _F DB (DRY BULB)
RETURN--AIR TEMPERATURE _F DB _F WB (WET BULB)
HEAT SUPPLY AIR TEMPERATURE _F
PRESSURES
REFRIGERANT SUCTION CIRCUIT A PSIG
CIRCUIT B PSIG
REFRIGERANT DISCHARGE CIRCUIT A PSIG
CIRCUIT B PSIG
j VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS
GENERAL --
j ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS (IF EQUIPPED)
j VERIFY SMOKE DETECTOR UNIT SHUTDOWN BY UTILIZING MAGNET TEST
REPEAT PROCESS FOR 2 COMPRESSOR SYSTEMS
Copyright 2018 Bryant Heating & Cooling Systems Edition Date: 01/18 Printed in U.S.A.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Catalog No: II549J---7---9---04
Replaces: II549J---7---9---03