Dunham-Bush ACXi 165-5SP-LN Installation, Operation And Maintenance Manual
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Dunham-Bush ACXi 165-5SP-LN Installation, Operation And Maintenance Manual

Dunham-Bush ACXi 165-5SP-LN Installation, Operation And Maintenance Manual

Air cooled rotary screw chillers
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INSTALLATION,
INSTALLATION,
OPERATION AND
OPERATION AND
MAINTENANCE
MAINTENANCE
MANUAL
MANUAL
50 Hz
50 Hz
50 Hz
Form No: MM0418A
- Mesa Hospital, Ankara, Turkey
Products That Perform...By people Who Care
AIR COOLED
ROTARY
SCREW
CHILLERS
MODEL:
ACXi 165-5SP-LN
R

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Summary of Contents for Dunham-Bush ACXi 165-5SP-LN

  • Page 1 Form No: MM0418A - Mesa Hospital, Ankara, Turkey INSTALLATION, INSTALLATION, OPERATION AND OPERATION AND Products That Perform...By people Who Care MAINTENANCE MAINTENANCE MANUAL MANUAL AIR COOLED ROTARY 50 Hz 50 Hz 50 Hz SCREW CHILLERS MODEL: ACXi 165-5SP-LN...

  • Page 2: Table Of Contents

    Compressor Unit ..........36 Figure 2.5A ACXi 165-5SP-LN Isolator Location....11 Table 5.4.2 R407c Pressure/Temperature Properties....40 Figure 2.5B ACXi 165-5SP-LN Isolator Point Load Data..11 Figure 3.2 ACXi 165-5SP-LN Typical Piping Schematic..14 Figure 3.3 Evaporator Water Pressure Drop ......15 Figure 3.13 Compressor Capacity Control Detail....

  • Page 3: Introduction

    To use this manual effectively, you must first identify your unit model from the unit nameplate. Your Dunham-Bush chiller has been manufactured under a careful quality control system. If the package is installed, operated and maintained with care and attention to the instructions contained herein, it will give many years of satisfactory service.
  • Page 4 1.0 INTRODUCTION TABLE 1.1 PHYSICAL SPECIFICATIONS Model ACXi 165-5SP-LN Compressor Model ( Qty. ) MSC 1210(1), 1212 (1) 2950 Oil Charge Liter (Qty) 37.3(1), 33.5 (2) % Unit Capacity Reduction (Min.) 100 – 25% Evaporator Model EXD16112J07DFRO Water Connections ( inch / mm ) 6 / 152 Nom.

  • Page 5: Installation

    2.1.2 CHILLED WATER FLOW reaches you in perfect condition. It is very Dunham-Bush ACXi Packaged important that the riggers and movers Water Chiller is designed for a constant...
  • Page 6 2.0 INSTALLATION FIGURE 2.3.2 ACXi 165-5SP-LN TYPICAL RIGGING - 6 -...

  • Page 7: Space Requirements And Clearance

    FIGURE 2.4.1 ACXI 165-5SP-LN SPACE REQUIREMENTS WALLS OR OBSTRUCTIONS The unit should be located so that air may circulate freely and not be recirculated. For proper air flow and access all sides of the unit must be a minimum of four feet away from any wall or obstruction. It is preferred that this distance be increased whenever possible.
  • Page 8 2.0 INSTALLATION FIGURE 2.4.1 ACXi 165-5SP-LN SPACE REQUIREMENTS Single Pit ( See Note 2 ) Double Pit ( See Note 2 ) Multi Pit Corner Wall Notes 1.) All Dimensions Are Minimal, Unless Otherwise Noted. 2.) Pit Installations Are Not Recommended.
  • Page 9 2.0 INSTALLATION FIGURE 2.4.2 ACXi 165-5SP-LN DIMENSIONAL DATA NOTE: ALL DIMENSIONS ARE IN INCHES [MM]. - 9 -...

  • Page 10: Vibration Isolation

    2.0 INSTALLATION 2.5 FOUNDATION Piping must be supported to avoid excess stress on the evaporator heads. Cut piping holes in the Refer to index for unit dimensions and load removable access panel at the end of the unit. points. Foundations must be level for proper Opening the hole to the left hand side of the operation and functioning of controls and panel so that it can still be removed after piping...
  • Page 11 B Dim. C Dim. D Dim. E Dim. ACXi 165-5SP-LN 141 3/4 141 3/4 FIGURE 2.5B ACXI 165-5SP-LN ISOLATOR POINT LOAD DATA Point Load - LBS Unit Model Total Operating Pos. #1 Pos. #2 Pos. #3 Pos. #4 Pos. #5 Pos.

  • Page 12: Controls

    After the installation has been completed and operation of the unit. checked, Form 9180 must be filled out and sent to the Dunham-Bush Service Department for 4.) Phase sequence to connectors L1, L2 and L3 authorized start-up representative to perform the shall be in that order.

  • Page 13: Operation

    The unit is ready for start-up when the control settings. A copy must be forwarded to following procedures have been Dunham-Bush, Inc., before the warranty will be completed. honored. 1. Water piping for the evaporator is installed and tested. 2. Electrical connections are made and 3.2 UNIT PIPING...
  • Page 14 3.0 OPERATION FIGURE 3.2 ACXi 165-5SP-LN TYPICAL SCHEMATIC PIPING - 14 -...
  • Page 15 3.0 OPERATION FIGURE 3.3 EVAPORATOR WATER PRESSURE DROP ACXi 165-5SP-LN 1000 FLOW RATE - USGPM - 15 -...

  • Page 16: Shut-Down (Overnight Or Weekend)

    9° and 12°F at full load design be taken from each compressor & submitted conditions. In some instances, it will be for lab analysis. Dunham-Bush offers this necessary to lower the superheat setting to service in its "Oil Kare" program. This ensure proper distribution.

  • Page 17: Safety Relief Valves

    3.0 OPERATION filters (inside compressor) into compressors 8. Turn control circuit power switch on, and all where it is compressed and starts the cycle again. individual compressor circuit switches. Press computer keyboard reset (RST). Vapor flows from the top of the liquid subcooler Compressors should start after start-up clock into the compressors at the vapor injection ports, times out and will come on in sequence to...
  • Page 18 3.0 OPERATION When the compressor is given a "hold" will be vented to suction, and the pressure in the command, valve A is de-energized (closed) and slide valve chamber will be reduced. The slide slide valve movement is halted. The internal valve spring will now move the slide valve back pressure regulating valve allows oil to bleed from toward the minimum capacity position.

  • Page 19: Electrical Data

    4.0 ELECTRICAL 4.1 ELECTRICAL DATA ACXI Unit Data Compressor Fan Motors Model Electrical Min Circuit Qty. Model Qty. ACXi Spec. Ampacity Branch Each Each Each Each Fuse Size V- PH- Hz 165-5SP- 400 - 3- 50 440A 600A MSC 1210 MSC 1212 1050 4.2 WIRING DIAGRAM...
  • Page 20 4.0 ELECTRICAL FIGURE 4.2 ACXi 165-5SP-LN WIRING SCHEMATIC - 20 -...
  • Page 21 4.0 ELECTRICAL - 21 -...
  • Page 22 4.0 ELECTRICAL - 22 -...
  • Page 23 4.0 ELECTRICAL - 23 -...
  • Page 24 4.0 ELECTRICAL - 24 -...
  • Page 25 4.0 ELECTRICAL - 25 -...
  • Page 26 4.0 ELECTRICAL - 26 -...
  • Page 27 4.0 ELECTRICAL - 27 -...
  • Page 28 4.0 ELECTRICAL - 28 -...
  • Page 29 4.0 ELECTRICAL - 29 -...
  • Page 30 4.0 ELECTRICAL - 30 -...
  • Page 31 4.0 ELECTRICAL - 31 -...

  • Page 32: Microcomputer Controller

    The terminal must be able to handle 3. Press ENTER. RS232 communications. For more information, 4. The day, time, and alarm code is Please contact Dunham-Bush Industries, M & E displayed. Alarm 1 is the most recent Service Department. alarm.

  • Page 33: To Calibrate Temperature And Pressure Sensors

    4.0 ELECTRICAL 4.4.7 TO SET DATE AND TIME 4. a.) If you want to change setpoint A, press in the desired new value and 1. You must be authorized. See Section press ENTER. if the new value is 4.4.4. within allowable limits, it will be 2.

  • Page 34: Chilled Water Pump Interlock And Flow Switch (Cwp And Cwfs)

    4.0 ELECTRICAL 3. Use Down select The schedule group turns on when CONTROL POINTS. any of the individual schedules turns on. The turn on time does not have to 4. Press ENTER. be earlier than the turn off time. 5. Use Down select Schedules turn on by time and day,...

  • Page 35: Customer Interlock

    4.0 ELECTRICAL NOTE: The flow switch or pump interlock oscillations. The current limit function cannot be used for normal control of the (see Section 4.5.7) overrides unit. (See Section 4.5.2). temperature control. The status of the compressor can be 4.5.2 Customer Control interlock observed by displaying the compressor control point (1CP or 4CP).

  • Page 36: Current Limiting (Microcomputer)

    4.0 ELECTRICAL TABLE 4.5.5 SAMPLE RAMP TIMES (MINUTES) FOR TWO COMPRESSOR UNIT Ramp Rate Start Point Start Point Start Point Setpoint Setpoint Setpoint Setpoint 33.4 25.0 20.9 16.6 12.5 10.4 11.2 4.5.6 Current Limiting (Microcomputer) controlled manually. To place computer in manual control, do the following: A maximum desired current is specified 1.

  • Page 37: Chilled Water Reset And Customer Control Interlock (Optional)

    4.0 ELECTRICAL 4.5.10 Chilled Water Reset and 4.6 SAFETY FUNCTlONS Customer Control Interlock (Optional) 4.6.1 Control Power Loss (Microcomputer) The chilled water temperature setpoint can be raised automatically by a 0-5 The microcomputer can be set up to start VDC signal provided by an external automatically or manually after a power controller.

  • Page 38: Oil Level Switch (Fs)

    4.0 ELECTRICAL reaches the high pressure set-point, and power loss A setpoint is factory set to turn on the alarm indicator lamp on the 0.0 to allow automatic start after PCR control box. high discharge failure. Compressor will not start for 15 pressure alarm will be recorded by the minutes after failure.

  • Page 39: Maintenance

    5.0 MAINTENANCE 5.1 GENERAL heat transfer surfaces can be detected by recording full load performance data on As with all mechanical equipment, a program of the log sheet. The best measure of regular inspection, cleaning and preventive performance of evaporator is approach, maintenance by trained personnel will contribute which is the difference between leaving greatly to the long satisfactory service life of this...
  • Page 40 5.0 MAINTENANCE TABLE 5.4.2 R-407c PRESSURE/ TEMPERATURE PROPERTIES Temperature Temperature Pressure Pressure Bubble Bubble psia psia -125.86 -87.70 -111.56 -79.76 50.0 344.8 5.95 -14.47 17.55 -8.03 10.3 -116.20 -82.33 -102.09 -74.49 55.0 379.3 10.70 -11.83 22.20 -5.44 13.8 -108.95 -78.31 -94.98 -70.54 60.0...

  • Page 41: Electrical Malfunction

    Note: Only DB 18 oil may be used in this circuit is short of charge. package. Use of other oil is not approved by Dunham-Bush, will result poor Be careful not to overcharge the machine.

  • Page 42: Troubleshooting

    5.0 MAINTENANCE 5.9 TROUBLESHOOTING SYMPTOM POSSIBLE CAUSE REMEDY 1. Unit will not a.) Power off. a.) Check main disconnect switch and main line fuses. start. b.) No control power. b.) Check control transformer fusing. c.) Compressor circuit c.) Close circuit breakers. If trip, check compressor. breakers open.

  • Page 43: Sample Log Sheet

    5.0 MAINTENANCE 5.10 SAMPLE LOG SHEET SHEET NO......DUNHAM-BUSH SCREW COMPRESSOR PACKAGED CHILLER NAMEPLATE DATA: UNIT MODEL NO............UNIT NO........VOLTS: ......Hz ....UNIT SERIAL NO............COMPRESSOR MODEL NOS..............START UP : DATE..........TIME........... DATE TIME ELAPSED TIME METERS COMP. NO.

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