Carrier 19XR Start-up, Operation And Maintenance Instructions Manual

Also see for HERMETIC CENTRIFUGAL LIQUID CHILLERS 19XR: User manual Start-up and service instructions Installation instructions Product data Installation instructions

Contents

Carrier 19XR Start-up, Operation And Maintenance Instructions Manual Manual pdf 56 page image

Perform a Control Test — Check the safety controlsstatus by performing an automated control test. Access theCONTROL TEST table and select a test to be performedfunction (Table 6).The Automated Control Test checks all outputs and inputsfor function. The compressor must be in the OFF mode tooperate the controls test. The compressor can be put in OFFmode by pressing the STOP push-button on the CVC. Eachtest asks the operator to confirm the operation is occurringand whether or not to continue. If an error occurs, the op-erator can try to address the problem as the test is being doneor note the problem and proceed to the next test.NOTE: Enter guide vane calibration to calibrate guideinput on CCM (Plug J4 upper terminal 9 and 10).NOTE: If during the control test the guide vanes do not open,verify the low pressure alarm is not active. (An active lowpressure alarm causes the guide vanes to close.)NOTE: The oil pump test will not energize the oil pump ifcooler pressure is below –5 psig (–35 kPa).When the control test is finished or the EXIT softkey ispressed, the test stops, and the CONTROL TEST menu dis-plays. If a specific automated test procedure is not com-pleted, access the particular control test to test the functionwhen ready. The CONTROL TEST menu is described in thetable below.CCM Pressure Thermistors Check of all thermistors.CCM Pressure Transducers Check of all transducers.Pump Checks operation of pump out-puts; pumps are activated. Alsotests associated inputs such asflow or pressure.Discrete ouputs Activation of all on/off outputsindividually.Guide Vane Check of the guide vaneoperation.Diffuser Actuator* Check of the diffuser actuator.Pumpdown/Lockout Pumpdown prevents the low re-frigerant alarm during evacuationso refrigerant can be removedform the unit. Also locks thecompressor off and starts thewater pumps.Terminate Lockout To charge refrigerant and enablethe chiller to run after pumpdownlockout.Guide Vane Calibration Calibrates guide vane input onCCM.*Diffuser tests function only on size 5 compressor with diffuser con-trol enabled.NOTE: During any of the tests, an out-of-range reading will have anasterisk (*) next to the reading and a message will be displayed.Check Optional Pumpout System Controls andCompressor — Controls include an on/off switch, a 3-ampfuse, the compressor overloads, an internal thermostat, a com-pressor contactor, and a refrigerant high pressure cutout.The high pressure cutout is factory set to open at 161 psig(1110 kPa) and reset at 130 psig (896 kPa). Ensure the water-cooled condenser has been connected. Loosen thecompressor holddown bolts to allow free spring travel. Openthe compressor suction and discharge the service valves. En-sure oil is visible in the compressor sight glass. Add oil ifnecessary.See the Pumpout and Refrigerant Transfer Procedures andOptional Pumpout System Maintenance sections, pages 62and 68, for details on the transfer of refrigerant, oil speci-fications, etc.Table 6 — Control Test Menu FunctionsTESTS TO BEPERFORMED DEVICES TESTED1. CCM Thermistors Entering Chilled WaterLeaving Chilled WaterEntering Condenser WaterLeaving Condenser WaterRemote Reset SensorComp Discharge TempComp Thrust Bearing TempOil Sump TempComp Motor Winding TempSpare Temperature 1Space Temperature 22. CCM PressureTransducers Evaporator PressureCondenser PressureOil Pump Delta PSpare Pressure Delta PCondenser Water Delta PTransducer Voltage Ref3. Pumps Oil Pump — Confirm pressureChilled Water — Confirm Delta PCondenser Water — ConfirmDelta P4. Discrete Outputs Oil Heater RelayHot Gas Bypass RelayTower Fan Relay LowTower Fan Relay HighAlarm RelayShunt Trip Relay5. Guide Vane Actuator Open/Close6. Diffuser Actuator Open/Close7. Pumpdown/Lockout When using pumpdown/lockout,observe freeze up precautions whenremoving charge:Instructs operator which valves toclose and when.Starts chilled water and condenserwater pumps and confirms flows.MonitorsEvaporator pressureCondenser pressureEvaporator temperature duringpumpout proceduresTurns pumps off after pumpdown.Locks out compressor.8. Terminate Lockout Starts pumps and monitors flows.Instructs operator which valves toopen and when.MonitorsEvaporator pressureCondenser pressureEvaporator temperature duringcharging processTerminates compressor lockout.High Altitude Locations — Because the chiller is ini-tially calibrated at sea level, it is necessary to recalibratethe pressure transducers if the chiller has been moved to ahigh altitude location. See the calibration procedure in theTroubleshooting Guide section.Charge Refrigerant into ChillerThe transfer, addition, or removal of refrigerant in springisolated chillers may place severe stress on external pip-ing if springs have not been blocked in both up and downdirections.56