Dunham Bush Air‐Cooled Screw Chiller

AFVX‐B‐6SR Series

Type of Compressors

Compressor

Rotary Scroll Reciprocating Screw Centrifugal

0 100 200 300 400 500 600 700TR

10 ~ 180TR(35 ~ 633 kW)

ACDS Series

ACDX Series

AFVX-B Series

77 ~ 329TR(270 ~ 1156 kW)

100 ~ 520TR(352 ~ 1830kW)

Air Cooled Chiller

Generation

AFVX-B-6SR Series

SPEC‐ Selection Program Electronic Catalogue

Generation

AFVX-B-6SR Series

High Efficiency Fan

- Low rpm & Low noise- 64-67dBA at 10 meter- IP 55

Condenser Coil

- V Coil Design- Inner Groove Copper tube- Aluminium Wave Fin

Flooded Evaporator

- Better Approach - High Efficiency- Inner Groove Copper tube

Microprocessor Controller

- Advance Vision 2020i Controller- Double Door Protection- Factory Packaged Starter

Vertical Screw Compressor

- Hermetic Patented Design- Small Footprint- Multiple Compressors- Acoustically Compartmentalized

AFVX-B-6SR Series

– 13 Models (100-504RT)

– Electronic Expansion Valve (EEV)

– Further enhanced evaporator with newshell design

– Average at 1.175 kw/rt– 10% more efficient

– Improved & Enhanced Compressor .– 127, 192 and 226mm rotor series– Qty 1 & 2 only

AFVX-B-6SR Series

– 3.4hp condenser fan motor

– Plate Heat Ex-changer Economizer

– Aluminium blade fan– 900mm fan diameter

– Compact footprint – Reduced height

Model

AFVX‐B

100‐6SR

120‐6SR

135‐6SR

165‐6SR

200‐6SR

225‐6SR

260‐6SR

280‐6SR

330‐6SR

360‐6SR

400‐6SR

450‐6SR

520‐6SR

Capacity

TR

99.6

116.0

132.2

164.9

192.3

216.0

251.9

278.8

328.7

359.0

384.6

432.0

503.8

Compressor

Qty KW

1 99.5

1 119.2

1 138.4

1 171.3

1 197.7

1 220.9

1 257.2

2 283.1

2 342.7

2 377.9

2 395.4

2 441.7

2 514.5

Condenser Fan Motor

Qty HP

7 3.4

7 3.4

7 3 .4

9 3.4

11 3.4

11 3 .4

13 3.4

18 3.4

18 3.4

18 3.4

22 3 .4

22 3.4

26 3 .4

Dimension

L W H

4710 2235 2235

4710 2235 2235

4710 2235 2235

5860 2235 2235

7210 2235 2368

7210 2235 2368

8360 2235 2368

11510 2235 2368

11510 2235 2368

11510 2235 2368

14420 2235 2368

14420 2235 2368

16720 2235 2368

Sound @ 10M

dB(A)

64

65

65

65

65

65

63

67

67

67

75

75

75

AFVX-B-6SR Series

Compressor Location

Model : AFVXB 100 – 260 Model : AFVXB 280 – 360 

Compressor Location

Model : AFVXB 400 – 520

Condenser Fan Cycling

Item Code Description Description AFVXB‐5SR

1. MII2 Main Incoming Isolator c/w Door Interlock Handle Yes2. SST Soft Starter c/w Bypass Contactor Yes3. VM3 3 Phase Voltmeter C/W Selection Switch Yes4. AM3 3 Phase Amperage Meter C/W Selection Switch Yes5. UVR Under/Over Voltage Protection Relay No6. GFI Ground Fault Interrupt Yes7. SVM System Voltage Measurement Yes

8. LA1 Low Ambient Version, min. ambient 7˚C No

9. LA2 Low Ambient Version, min. ambient ‐10˚C Yes10. LA3 Low Ambient Version, min. ambient ‐29˚C Yes11. HGBP Hot Gas Bypass for low load operation‐Auto Lead Lag Yes12. COP Copper‐Copper Condenser Coil Yes13. HYD Hydrophillic Coated Condenser Fin Yes14. 250 250 PSI Working Pressure Vessels (Flooded) Yes15. INS Evaporator Insulation No16. DINS Double Evaporator Insulation 2" Yes17. DES Heat recovery (Desuperheater) Yes18. ISO Isolation Valves Compressor(s) Suction, Discharge & VI No

19. FWC1 Flanged Water Connections Evap.

NO APPROVAL YesASME YesJKKP APPROVAL YesPED APPROVAL Yes

20. GRL Protective Grille Condenser No

Option List

Item Code Description Description AFVXB‐5SR

21. HEA Heater System to Protect Cooler Against Freezing, Protected up to ‐20˚C Yes

22. LN2 Compressor(s) Acoustic Jacket Yes23. LN Low Noise Version, including LN1 or LN2 and LN fans No24. 2YC 2 Year Compressor Warranty Yes25. 5YC 5 Year Compressor Warranty Yes26. SPG Spring Vibration Isolators  Yes27. RIS Rubber‐in Rush Isolator  Yes28. WFS Water Flow Switch : CE marking Yes29. WFS1 Water Flow Switch :NEMA1, min fluid & ambient 32ºF Yes30. WFS4 Water Flow Switch :NEMA4, min fluid & ambient ‐62ºF Yes31. IP55 IP55 Control Panel Yes32. PED PED coded vessels Yes33. ASME ASME coded vessels Yes34. JKKP JKKP coded vessels Yes35. SQL Chinese Machinery (SQL) coded vessels No36. CE PED (including piping) + CE components  Yes37. CE PED (vessel) + CE components + IEC Control Panel Yes38. DM Dual Mode (Ice ‐Cel) Yes39. SHC Semi Hermetic Compressor Yes

Option List

Unique Patented Screw compressor technology

High reliability and stability

Excellent Performance And Operation Cost Efficiency

New Improved, Enhance & Extended capacity range of 192mm and 226mmcompressor series

AFVX-B-6SR Series

Dynamic balancing and over speed testing before assembly to ensure the quality and stability..

Dunham-Bush patented screw profile design which is specially made for R134a application..

Carbon Steel screw profile with high precision machining..

AFVX-B-6SR Series

Core components are all processed by sophisticated facilities

AFVX-B-6SR Series

Flooded heat exchanger technology. Making use of unique “Skip-fin” Efficient Tube Design

Entering Water

Refrigeration Vapor

Tube

Eliminator

Refrigeration Liquid

Flow Equalizer

Leaving Water

before

DB type (“skip-fin” design)

Evaporator Improvement

.

Suction baffle design (Eliminator) to eliminate or reduce the liquid carry over possibility. Provides uniform distribution of refrigerant over the entire shell length to yield optimum heat transfer

Evaporator Improvement

• Higher capacity and Higher EER achievable with the same compressor

− Good evaporator approach temperature     < 3 F 

− Higher evaporating temperature compared to the DX evaporator system

− Capacity increases from 724 RT to 796 RT

♦ 10% increase in capacity

− Very little power increase

Flooded Evaporator

• Better Part‐Load Efficiency

Flooded Chiller   Evaporator fully utilizes tube surface  for heat 

transfer at part load

DX Chiller Normally blank off part of the evaporator circuit Portion of the tubes will not be used for heat  

transfer at part load

Flooded Evaporator

Water in tubes

Refrigerant in shell

DX Evaporator

Refrigerant in tubes

Water in shell

Flooded Evaporator

Flexible programmable DDC advance Vision2020i controller. Complete with digital and analog I/O. Monitoringequipment or system status, water flow status, temperature, pressure, compressor amp, external start/ stopcommand status, and run time status.

Embedded system protection controls. Low suction, high discharge, Freeze protection, compressor run error,compressor anti-cycle, compressor over current, compressor low oil and power lost…etc

Remote Monitoring made possible with optional communication card(s) and NETVISOR software. Add oncards (options) are also available to allow direct interface to Building Management System (BMS) by means ofstandards open communication protocols (MODBUS / LONWORKS / BACNET MSTP or even Over IP)

Advance Controller

Chiller Monitoring & Control

Vary Flow rate of pump(s) by controlling system VFD.

Main equipment control and monitoring.

Temp difference monitoring and feedback.

PC Workstation

Remote PC Workstation

Database Server

Notebook PC Workstation

Chillers Primary CW Pumps

Second. CW Pumps

AHRI Certified Testing Facilities

• Completed Units will be inspected by Quality Control Dept.

• Every unit undergoes a functional and a full load performancetest by the Chiller Testing Team before they are shipped outto end users.

• Unit is shipped with refrigerant charged and Lubricating oil.

Semi Hermetic and Fully Hermetic Comparison

07 HSC vs VSC Configuration.swf

Semi Hermetic and Fully Hermetic Comparison- Structure

Single Layer Shell

• Double Layer Shell

• All moving parts concealed within internal shell (Noise confined)

• Hermetic Outer Shell –no leak, further noise reduction

Semi Hermetic and Fully Hermetic Comparison- Rotor

Superb wear & tear resistance

Semi Hermetic and Fully Hermetic Comparison- Rotor

1st or Primary Oil Separator

Primary Oil Separator

Semi Hermetic and Fully Hermetic Comparison- Oil Separation

99.7% Oil Separation

Oil Deflector

2nd or Secondary Oil Separator

Semi Hermetic and Fully Hermetic Comparison- Bearing Lubrication

Differential Pressure Lubrication Submerged in Oil – Always lubricated

Semi Hermetic and Fully Hermetic Comparison- Capacity Control

Precise Capacity Control with Hydraulically actuated electronically initiated stepless slide valve control

Semi Hermetic and Fully Hermetic Comparison- Motor Cooling

Ensure superheat on part load –maximize oil separation, minimize oil carry-over

Variable Frequency Drive Compressor Frequency range of 25-60Hz. IPLV improvement of 20-30% Environmentally Friendly R134A Low Noise and Compact

What’s Next..??

Air Cooled Screw Chiller with Inverter Driven (VFD)…

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