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

Page 1: ...tal Ankara Turkey AIR COOLED ROTARY SCREW CHILLERS INSTALLATION OPERATION AND MAINTENANCE MANUAL INSTALLATION OPERATION AND MAINTENANCE MANUAL MODEL ACXi 165 5SP LN 50 Hz 50 Hz 50 Hz Products That Per...

Page 2: ...r 35 4 5 4 Load Control Microcomputer 35 4 5 5 Ramp Control Microcomputer 35 4 5 6 Current Limiting Microcomputer 36 4 5 7 Staging Control Microcomputer 36 4 5 8 Manual lead Lag Control Microcomputer...

Page 3: ...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: ...PD ft wg 402 4 19 8 Min Max Water Flow GPM 197 5 481 6 Min Max Water Flow PD ft wg 6 1 30 0 Air Cooled Condenser Coil Rows Deep FA Sq Ft 3 141 2 3 141 2 No Of Fans 6 6 Fan Diameter inch mm 31 5 800 0...

Page 5: ...portant that the following inspection be completed in the presence of the carrier s representative 1 Check all crates and cartons received against the Bill of Lading Shipping Papers to be sure they ag...

Page 6: ...2 0 INSTALLATION FIGURE 2 3 2 ACXi 165 5SP LN TYPICAL RIGGING 6...

Page 7: ...e located in the vicinity of steam hot air or fume exhausts Another consideration which must be taken into account is that the unit should be mounted away from noise sensitive spaces and must have ade...

Page 8: ...oted 2 Pit Installations Are Not Recommended Re Circulation Of Hot Condenser Air In Combination With Surface Air Turbulence Cannot Be Predicted Hot Air Re Circulation Will Severely Affect Unit Efficie...

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: ...evaporator heads Cut piping holes in the removable access panel at the end of the unit Opening the hole to the left hand side of the panel so that it can still be removed after piping is in place Hole...

Page 11: ...el Dimensions Inches A Dim B Dim C Dim D Dim E Dim ACXi 165 5SP LN 86 18 141 3 4 141 3 4 21 FIGURE 2 5B ACXI 165 5SP LN ISOLATOR POINT LOAD DATA Unit Model Point Load LBS Total Operating Pos 1 Pos 2 P...

Page 12: ...controls must be set to factory recommendations 2 10 REQUEST FOR START UP REPRESENTATIVE After the installation has been completed and checked Form 9180 must be filled out and sent to the Dunham Bush...

Page 13: ...before attempting to start Important Do not use chilled water pump operation via the flow switch or Aux chilled water pump contacts to start stop this unit These are safety controls not operational co...

Page 14: ...3 0 OPERATION FIGURE 3 2 ACXi 165 5SP LN TYPICAL SCHEMATIC PIPING 14...

Page 15: ...1 10 100 100 1000 FLOW RATE USGPM PRESSURE DROP FT WG 3 0 OPERATION FIGURE 3 3 EVAPORATOR WATER PRESSURE DROP ACXi 165 5SP LN 15...

Page 16: ...nnect Main power is required to keep the sump heaters 3 7 SEASONAL SHUT DOWN PROCEDURE Standard Ambient Units 1 Follow standard overnight shut down procedure 2 Turn off chilled water pump 3 Close manu...

Page 17: ...from the boiling refrigerant flows up the suction pipes through shut off valves suction check valves and suction filters inside compressor into compressors where it is compressed and starts the cycle...

Page 18: ...energized open the high pressure oil acting on the slide valve will be vented to suction and the pressure in the slide valve chamber will be reduced The slide valve spring will now move the slide valv...

Page 19: ...fety conditions satisfied Leaving chilled water temperature 2 F or more above setpoint A compressor is started by first energizing 1M1 followed by 1M2 Anti recycle time of 15 minutes is initiated with...

Page 20: ...CHECKED REV NO DATE APPROV 4 0 ELECTRICAL FIGURE 4 2 ACXi 165 5SP LN WIRING SCHEMATIC 20...

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Page 32: ...e viewed with the right and left arrow keys NOTE When displaying analog sensors the PAGE MODE key can be pressed to display two new analog inputs after each arrow key is pressed Press PAGE MODE again...

Page 33: ...0 3 psig with a zero calibration of 1 then new calibration would be 58 60 3 1 3 3 3 So the zero calibration should be changed to 3 Then the computer will display 58 3 4 4 7 TO SET DATE AND TIME 1 You...

Page 34: ...le press the right arrow key and repeat steps 7 13 15 To delete a schedule clear all of the days by pressing 0 at Step 12 The schedule group turns on when any of the individual schedules turns on The...

Page 35: ...al load The load target is varied based on rate of approach to desired temperature preventing significant temperature oscillations The current limit function see Section 4 5 7 overrides the temperatur...

Page 36: ...Microcomputer On multi compressor machines the lead compressor can be chosen by storing 0 0 or 1 0 in the lead setpoint B position 0 0 is for lead on compressor 1 and 1 0 is for lead on compressor 2 i...

Page 37: ...unning Its purpose is to prevent refrigerant migration into the oil during shut down For this reason it is essential that heaters be energized for 24 hours before starting a compressor 4 6 SAFETY FUNC...

Page 38: ...y lCR will de energize and open the control circuit A LED light located on the PCR indicates a good voltage supply The power loss A setpoint is factory set to 0 0 to allow automatic start after PCR fa...

Page 39: ...load performance data on the log sheet The best measure of performance of evaporator is approach which is the difference between leaving water temperature and saturated refrigerant temperature at the...

Page 40: ...34 06 36 70 130 0 896 6 58 85 14 92 69 14 20 63 16 0 110 3 43 56 41 98 30 90 34 94 140 0 965 5 63 50 17 50 73 65 23 14 18 0 124 1 38 99 39 44 26 43 32 46 150 0 1034 5 67 90 19 94 77 92 25 51 20 0 137...

Page 41: ...ble at any operating condition the circuit is short of charge Be careful not to overcharge the machine Overcharging will result in considerable liquid logging in the condenser and excessive condensing...

Page 42: ...Check wiring against drawing 4 Compressor overload a Compressor drawing high amps a Check motormegohms Reset overloads run com presssor an check amps Do not exceed RL x 1 25 Call D B serviceman 5 High...

Page 43: ...ORATOR WATER TEMPERATURE IN EVAPORATOR WATER TEMPERATURE OUT EVAPORATOR PRESSURE DROP PSI IN WATER EVAPORATOR WATER FLOW GPM CONDENSER AIR TEMPERATURE IN AMBIENT AC ONLY 1 2 3 ACTUAL VOLTAGE COMPRESSO...