Carrier 17 Start Up & Operation Manual

Contents

INITIAL START-UPPreparation — Before starting the machine, check thatthe:1. Power is on to the main starter, oil pump relay, tower fanstarter, oil heater relay, and the machine controlcenter.2. Cooling tower water is at proper level, and at or belowdesign entering temperature.3. Machine is charged with refrigerant and all refrigerantand oil valves are in their proper operating position.4. Oil is at the proper level in the reservoir sight glasses.5. Oil reservoir temperature is above 140 F (60 C) or re-frigerant temperature plus 50° F (28° C).6. Valves in the evaporator and condenser water circuits areopen.NOTE: If pumps are not automatic, make sure water iscirculating properly.7. Check the starter to ensure it is ready to start and that allsafety circuits have been reset. Be sure to keep the starterdoor closed.Do not permit water or brine that is warmer than 110 F(43 C) to flow through the cooler or condenser. Refrig-erant overpressure may discharge through the relief de-vices and result in the loss of refrigerant charge.8. Press RELEASE to automate the chiller start/stop valueon the Status01 screen to enable the chiller to start. Theinitial factory setting of this value is overridden to stop inorder to prevent accidental start-up.Manual Operation of the Guide Vanes — Manualoperation of the guide vanes is helpful to establish a steadymotor current for calibration of the motor amps value.In order to manually operate the guide vanes, it is nec-essary to override the TARGET GUIDE VANE POSITIONvalue which is accessed on the Status01 screen. Manual con-trol is indicated by the word ‘‘SUPVSR!’’ flashing after thetarget value position. Manual control is also indicated on thedefault screen on the run status line.1. Access the Status01 screen and look at the target guidevane position (Fig. 18). If the compressor is off, the valuewill read zero.2. Move the highlight bar to the TARGET GUIDE VANEPOSITION line and press the SELECT softkey.3. Press ENTER to override the automatic target. The screenwill now read a value of zero, and the word‘‘SUPVSR!’’ will flash.4. Press the SELECT softkey, and then pressRELEASE softkey to release the vanes to AUTO-MATIC mode. After a few seconds the ‘‘SUPVSR!’’ willdisappear.Dry Run to Test Start-Up Sequence1. Disengage the main motor disconnect on the starter frontpanel. This should only disconnect the motor power. Powerto the controls, oil pump, and starter control circuit shouldstill be energized.2. Look at the default screen on the LID: the Status mes-sage in the upper left-hand corner will show a ‘‘ManuallyStopped’’ message. Press CCN or Local to start. If not,go to the Schedule screen and override the schedule orchange the occupied time. Press the LOCAL softkey tobegin the start-up sequences.3. Check that chilled water and condenser water pumpsenergize.4. Check that the oil pump starts and pressurizes the lubri-cation system. After the oil pump has run about 15 sec-onds, the starter will be energized and go through its start-upsequence.5. Check the main contactor for proper operation.6. The PIC will eventually show an alarm for motor ampsnot sensed. Reset this alarm and continue with the initialstart-up.Check Rotation (Open-Drive Motor)OPEN DRIVE MOTOR INITIAL START-UPInitial Uncoupled Start-Up — The initial start-up of the mo-tor should be made with the motor uncoupled. Verify that oilhas been added to each bearing housing to the correct level.1. If the motor is equipped with unidirectional fans (refer tothe certified drawing) and verification of rotation direc-tion is required, the following procedure should befollowed:a. Start the motor and observe the rotation direction.b. Allow the motor to achieve full speed before discon-necting it from the power source.c. If the rotation direction must be changed, refer to theBefore Initial Start-Up, Open Drive Motor ElectricalConnection section, page 47. Otherwise, the motor canbe restarted immediately after it has coasted to a stop.2. Following the initial start-up, the bearing temperaturesshould be closely monitored. On sleeve bearings, the freerotation of the oil rings should be verified by observingthem through the viewing port in the top of the housing.The rate of rise in bearing temperature is more indicativeof impending trouble than the actual temperature. If therate of rise in temperature is excessive or if the motorexhibits excessive vibration or noise, it should be shutdown immediately and a thorough investigation made asto the cause before it is operated again.If the bearing temperature rise and motor operation ap-pear to be normal, operation should continue until the bear-ing temperatures stabilize. Recommended limits on bear-ing temperature rises over ambient temperature are asfollows:Sleeve BearingsTemperature RiseOver AmbientTemperatureBy permanently installeddetector 72° F (40° C)By temporary detector on topof the bearing sleeve near theoil ring 63° F (35° C)58