Table of Contents
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ACDX/AUDX
Screw Type Air-Cooled Packages
Installation, Operation, and Maintenance Instructions
TABLE OF CONTENTS
DESCRIPTION ........................................................................................................... PAGE NO.
Introduction & Product Identification .......................................................................................... 1
Physical Specifications .............................................................................................................. 2
Inspection .................................................................................................................................. 3
Rigging and Moving ................................................................................................................... 3
Location and Mounting .............................................................................................................. 3
Piping connections ............................................................................................................... 3 & 4
Multiple Chiller Water Connections ...................................................................................... 4 & 5
AUDX Condensing Unit Piping................................................................................................... 4
Electrical Connections ............................................................................................................... 6
Maintenance .............................................................................................................................. 7
Slide Valve Unloading Operation................................................................................................ 8
Low Ambient Operation ............................................................................................................. 9
Fan Position Numbers .............................................................................................................. 10
Fan Cycling Sequence ............................................................................................................. 11
ACDX Sequence of Operation ................................................................................................. 12
Electrical Controls ........................................................................................................ 13, 14, 15
Field Control Wiring ......................................................................................................... 15 & 16
Star-Delta Starting Operation .................................................................................................. 16
Microcomputer Controller ............................................................................................. 16 thru 23
Typical Wiring Diagram and Electrical Data ................................................................. 24 thru 30
Evaporator Water Pressure Drop ............................................................................................. 31
ACDX Refrigerant Piping Schematic ....................................................................................... 32
Condenser Clearance Requirements ....................................................................................... 33
Rigging Instructions ................................................................................................................. 34
Point Loading ...................................................................................................................... 35-40
Trouble Shooting Guide ........................................................................................................... 41
Start-up Check List .................................................................................................................. 42
Form 6193A
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Table of Contents
Related Manuals for Dunham-Bush ACDX
Summary of Contents for Dunham-Bush ACDX
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Page 1: Table Of Contents
Piping connections ....................... 3 & 4 Multiple Chiller Water Connections ..................4 & 5 AUDX Condensing Unit Piping....................4 Electrical Connections ....................... 6 ACDX Operation & Start-up ....................6 & 7 Maintenance ..........................7 Slide Valve Unloading Operation....................8 Low Ambient Operation ......................9 Fan Position Numbers ...................... -
Page 2: Introduction & Product Identification
Your Dunham-Bush package has been manufactured information for installation, operation and maintenance under a careful quality control system. If the package of the latest generation of the Dunham-Bush small is installed, operated and maintained with care and screw compressor air-cooled packaged chillers. -
Page 3: Physical Specifications
PHYSICAL SPECIFICATIONS MODEL SIZE Compressor Model (Qty) SSCA050 (1) SSCA060 (1) SSCA075 (1) SSCA050 (2) SSCA060 (2) SSCA075 (2) Displ (CFH)/Compr. 5850 7212 8880 5850 7212 8880 Oil Chg/Compr (Qts.)(Type) 5 3/4(D/B SR 30) 6 3/4(D/B SR30) 6 3/4(D/B SR30) 5 3/4(D/B SR 30) 6 3/4(D/B SR30) 6 3/4(D/B SR30) % Capacity Reduction 100 - 33% MIN. -
Page 4: Inspection
The ACDX/AUDX 040-060 units are to be rigged thru the All piping which is external to the packaged chiller must be small holes at the bottom of each leg. On units with optional... -
Page 5: Multiple Chiller Water Connections
Figure 1B. The bypass valve must be set to Water Quality ACDX - Coolers used in these packages are assure the full flow of circulating chilled water when the made of steel, copper and brass and are suitable for modulating valve is completely closed. - Page 6 TYPICAL CHILLED WATER PIPING TYPICAL MULTIPLE PACKAGED CHILLED WATER CONNECTIONS PARALLEL FLOW PARALLEL FLOW SERIES FLOW...
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Page 7: Electrical Connections
A copy must be forwarded to Dunham-Bush, Inc., personnel in its operation and maintenance for the length North American Service, Harrisonburg, Virginia before the of time specified in the purchase contract. -
Page 8: Maintenance
7. The electrical control settings should be checked and, if prevent moisture entering system necessary, reset to those settings indicated on the wiring contaminating the oil extra care is necessary. Follow diagram. Safety controls are factory set and must be the enclosed procedure to add or remove oil from the maintained at settings indicated on the wiring diagram. -
Page 9: Slide Valve Unloading Operation
SLIDE VALVE UNLOADING SYSTEM The slide valve will move to the left (loading) by force of discharge The DB screw compressor capacity control system for infinite pressure, whenever UL-1 opens to permit flow to the oil return modulation consists of a slide valve and hydraulic piston/cylinder operator internal to the compressor, plus three hydraulic solenoid (low pressure) line. -
Page 10: Low Ambient Operation
The ACDX coolers are heat tape wrapped which utilize built-in 38 E F thermostats and are insulated for protection down to about -20 E F. -
Page 11: Fan Position Numbers
ACDX AND AUDX FAN POSITION NUMBERS (See Fan Cycling Sequence Chart) 150-1,2 150-3 Front Rear 170-1,2 170-3 185-1,2 185-3 Front Rear 210-3,4 210-1,2 235-3,4 235-1,2 255-3,4 255-1,2 Front Rear * 7 Main Control Box End, all models C = Circuit No. -
Page 12: Fan Cycling Sequence
ACDX FAN CYCLING SEQUENCE CHART Refrig Fan Nos. "On" Per Step Model Circuit 1 LH/RH 1, 2 1 LH/RH 1, 2 5, 6 1 LH/RH 1, 2 5, 6 1 LH 2 RH 1 LH 7, 9 2 RH 8, 10... -
Page 13: Acdx Sequence Of Operation
(e.g. 44 E F). The following sequence of operation is typical of all electromechanical ACDX Models. Refer to the wiring Set point adjustment is accomplished directly on the diagram furnished with the unit for specific control. -
Page 14: Electrical Controls
7. Under Voltage Relay (UVR) Voltage Relay (UVR). ELECTRICAL CONTROLS Refer to pages 27 & 28 for A generation wiring - Flow Switch. For ACDX/AUDX units, a diagram. chilled water flow switch must be installed at the job site to ensure chilled water flow The following electrical controls that are used on A while the package is in operation. - Page 15 40 E F). compressor damage. 10,11PS - Fan Pressure Switch (Automatic, Reverse Chiller Heater and Thermostat (ACDX (A Gen) Acting) only) This switch (in multiples) is used to stage The chiller heater with integral thermostat...
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Page 16: Field Control Wiring
ELECTRICAL CONTROLS (Cont'd) Load/Unload/Fast Unload Solenoid Valves 16TAS - Load Limit Thermostat (Optional) load/unload solenoid valves (A Gen) This thermostat prevents loading of the modulate to the compressor slide valve compressor(s) when return water during normal operation in response to temperature is above the dial setting. -
Page 17: Star-Delta Starting Operation
MICROCOMPUTER CONTROLLER 1. General Description The software for the computer is stored in three different types of computer memory chips. The two Your Dunham-Bush ACDX/AUDX is controlled by EPROM chips (Electrically Programmable Read Only an NC25 microcomputer system. The computer Memory) - Page 18 2.3. Strip wires away from microcomputer to 2.6. Disconnect power to the NC25 when changing prevent strands from falling on a chip on the board. Check to make sure that components. pin 1 of chip is in upper-left corner and that the chip is inserted fully before reconnecting 2.4.
- Page 19 3. Press ENTER. The current status will change To Set Date and Time to PROG (program) if accepted. If no keys are You must be authorized. See Section 3.4. pressed for five minutes, or if the Authorization Select DATE & TIME SET on the main screen is re-displayed, the authorization to menu.
- Page 20 CP# COMP UNLD COM Computer unload CP# COMP CURRENT STATUS: UNLD Manual unload CP# COMP OFF COM Off on a normal 4. ACDX/AUDX Package Control control In order to start a unit, the following conditions shutdown must be met: CP# COMP COFF COM...
- Page 21 Some packages may have logic that prevents 4.1.2. Manual Control loading if the leaving water temperature is Screw compressors controlled falling (negative derivative) at a certain rate. manually with the keypad. A compressor can be turned on, off, or placed in computer The desired leaving water temperature is control.
- Page 22 4.3. Compressor Current Limiting 4.6. Compressor Start Delay The amp limit B setpoint on the unit control A compressor start delay of one or two minutes data sheet is the amp value at which the is incorporated into the computer to prevent two compressor will be prevented from loading.
- Page 23 4.13 Alarm Output The computer will open this relay if it detects The alarm control point closes the digital that a compressor auxiliary contact digital input output relay on all safety alarms. This relay is stays ON for 15 seconds when the computer is used to turn an alarm light on.
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Page 24: Microcomputer Controller
4.22 High Motor Temperature Safety 4.24 High Discharge Pressure Unload If the high motor temperature switch of a This function unloads the compressor if compressor opens, the motor temperature discharge pressure is approaching the high digital input turns ON. If the compressor is pressure limit. - Page 25 TYPICAL POWER WIRING (ACDX120A) "...
- Page 26 TYPICAL CONTROL WIRING (ACDX120A)
- Page 27 TYPICAL OPTIONS WIRING (ACDX120A)
- Page 28 TYPICAL CONTROL WIRING (ACDX120B W/MICRO)
- Page 29 TYPICAL CONTROL WIRING (ACDX120B W/MICRO) &...
- Page 30 TYPICAL OPTIONS WIRING (ACDX120B W/MICRO)
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Page 31: Typical Wiring Diagram And Electrical Data
ACDX ELECTRICAL DATA Volts Compressor Fan Motor Compr. Sump Htr. CHR Htr Circuit Model 3/60 MCA MFS HP(qty) RLA(ea) LRA-XL(ea) LRA-YD(ea) Qty Hp FLA(ea) Total Watts Total Amps Total Watts Total Amps 50(1) 1040 50(1) 1040 50(1) 60(1) 1228 60(1) -
Page 32: Evaporator Water Pressure Drop
WATER SIDE PRESSURE DROP 1000 FLOW RATE - GPM ACDX Model Size Cooler Model Curve No. Min. GPM Max. GPM CHSO10601B CHS011601B CHS013601B EXD14102J09 EXD16112J09 EXD16122J07 EXT18122J07 1060 EXT18122J07 1060 EXT20122J07 EXF20122J07 1135 EXF20122J07 1135 EXF20122J07 1135... -
Page 34: Condenser Clearance Requirements
ACDX/AUDX CONDENSER CLEARANCE... -
Page 35: Rigging Instructions
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Page 36: Point Loading
ACDX LOAD POINTS... - Page 37 ACDX RUBBER-IN-SHEAR ISOLATOR...
- Page 38 ACDX SPRING ISOLATOR...
- Page 39 AUDX LOAD POINTS !&...
- Page 40 AUDX RUBBER-IN-SHEAR ISOLATOR...
- Page 41 AUDX SPRING ISOLATOR " ...
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Page 42: Troubleshooting Guide
TROUBLESHOOTING GUIDE POSSIBLE CAUSE REMEDY CHILLER UNIT WILL NOT START 1. Power off Check main disconnect switch 2. Main line open Check main fuses 3. Incorrect wiring Check the wiring diagram 4. Loose terminals Tighten all terminals 5. Control circuit open Check phase loss monitor, flow switch, circuit breakers, temperature control, low ambient thermostat, low temperature, thermostat, remote... -
Page 43: Start-Up Check List
START-UP CHECK LIST Date Unit Model No. Setting Unit: a. Vibration isolator used b. Spring isolator adjusted for equal height c. If rubber-in-shear isolators are used, is unit leveled by shimming Wiring: a. Power wiring complete b. Control wiring complete c. - Page 44 101 Burgess Road Harrisonburg, VA 22801 PH (540) 434-0711, FAX (540) 434-4595 I&O 6193A Issued 9/98 Printed in U.S.A.
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