Carrier 19XR User Manual

Also see for AquaEdge 19XRV series: Start-up, operation and maintenance instructions Start-up and service instructions Installation instructions Start-up, operation and maintenance instructions Start-up and service instructions

Contents

66OPTIONAL PUMPOUT STORAGE TANK AND PUMP-OUT SYSTEM — Transfer valves and pumpout system, refrig-erant charging and pumpdown procedure, and relief devices.MOTOR COMPRESSOR ASSEMBLY — Guide vane actu-ator, transmission, motor cooling system, oil cooling system,temperature and pressure sensors, oil sight glasses, integral oilpump, isolatable oil filter, extra oil and motor temperature sen-sors, synthetic oil, and compressor serviceability.MOTOR COMPRESSOR LUBRICATION SYSTEM —Oil pump, cooler filter, oil heater, oil charge and specification,operating and shutdown oil level, temperature and pressure,and oil charging connections.CONTROL SYSTEM — CCN and LOCAL start, reset,menu, softkey functions, CVC/ICVC operation, occupancyschedule, set points, safety controls, and auxiliary and optionalcontrols.AUXILIARY EQUIPMENT — Starters and disconnects,separate electrical sources, pumps, and cooling tower.DESCRIBE CHILLER CYCLES — Refrigerant, motorcooling, lubrication, and oil reclaim.REVIEW MAINTENANCE — Scheduled, routine, and ex-tended shutdowns, importance of a log sheet, importance ofwater treatment and tube cleaning, and importance of maintain-ing a leak-free chiller.SAFETY DEVICES AND PROCEDURES — Electrical dis-connects, relief device inspection, and handling refrigerant.CHECK OPERATOR KNOWLEDGE — Start, stop, andshutdown procedures, safety and operating controls, refrigerantand oil charging, and job safety.REVIEW THE START-UP OPERATION, AND MAINTE-NANCE MANUAL.OPERATING INSTRUCTIONSOperator Duties1. Become familiar with the chiller and related equipmentbefore operating the chiller.2. Prepare the system for start-up, start and stop the chiller,and place the system in a shutdown condition.3. Maintain a log of operating conditions and document anyabnormal readings.4. Inspect the equipment, make routine adjustments, andperform a Control Test. Maintain the proper oil and re-frigerant levels.5. Protect the system from damage during shutdown periods.6. Maintain the set point, time schedules, and other PICfunctions.Prepare the Chiller for Start-Up — Follow the stepsdescribed in the Initial Start-Up section, page 64.To Start the Chiller1. Start the water pumps, if they are not automatic.2. On the CVC/ICVC default screen, press the orsoftkey to start the system. If the chiller is in theOCCUPIED mode and the start timers have expired, thestart sequence will start. Follow the procedure describedin the Start-Up/Shutdown/Recycle Sequence section,page 46.Check the Running System — After the compres-sor starts, the operator should monitor the CVC/ICVC displayand observe the parameters for normal operating conditions:1. The oil reservoir temperature should be above 120 F(49 C) during shutdown.2. The bearing oil temperature accessed on the COMPRESStable should be 120 to 165 F (49 to 74 C). If the bearingtemperature reads more than 180 F (83 C) with the oilpump running, stop the chiller and determine the cause ofthe high temperature. Do not restart the chiller untilcorrected.3. The oil level should be visible anywhere in one of the twosight glasses. Foaming oil is acceptable as long as the oilpressure and temperature are within limits.4. The oil pressure should be between 18 and 30 psid (124to 207 kPad) differential, as seen on the CVC/ICVC de-fault screen. Typically the reading will be 18 to 25 psid(124 to 172 kPad) at initial start-up.5. The moisture indicator sight glass on the refrigerantmotor cooling line should indicate refrigerant flow and adry condition.6. The condenser pressure and temperature varies with thechiller design conditions. Typically the pressure willrange between 60 and 135 psig (390 to 950 kPa) with acorresponding temperature range of 60 to 105 F (15 to41 C). The condenser entering water temperature shouldbe controlled below the specified design enteringwater temperature to save on compressor kilowattrequirements.7. Cooler pressure and temperature also will vary with thedesign conditions. Typical pressure range will be between60 and 80 psig (410 and 550 kPa), with temperature rang-ing between 34 and 45 F (1 and 8 C).8. The compressor may operate at full capacity for a shorttime after the pulldown ramping has ended, even thoughthe building load is small. The active electrical demandsetting can be overridden to limit the compressor IkW, orthe pulldown rate can be decreased to avoid a highdemand charge for the short period of high demand oper-ation. Pulldown rate can be based on load rate or temper-ature rate and is accessed on the EQUIPMENT SER-VICE screen, RAMP_DEM table (Table 2, Example 21).To Stop the Chiller1. The occupancy schedule starts and stops the chiller auto-matically once the time schedule is configured.2. By pressing the STOP button for one second, the alarmlight blinks once to confirm the button has been pressed.The compressor will then follow the normal shutdownsequence as described in the Shutdown Sequence, Start-Up/Shutdown/Recycle Sequence section, page 46. Thechiller will not restart until the or soft-key is pressed. The chiller is now in the OFF controlmode.Do not restart the chiller until the problem is diagnosedand corrected.After Limited Shutdown — No special preparationsshould be necessary. Follow the regular preliminary checks andstarting procedures.Preparation for Extended Shutdown — The refrig-erant should be transferred into the pumpout storage tank (ifsupplied; see Pumpout and Refrigerant Transfer Procedures) toreduce chiller pressure and the possibility of leaks. Maintain aholding charge of 5 to 10 lbs (2.27 to 4.5 kg) of refrigerant ornitrogen to prevent air from leaking into the chiller.If freezing temperatures are likely to occur in the chiller ar-ea, drain the chilled water, condenser water, and the pumpoutcondenser water circuits to avoid freeze-up. Keep the waterboxdrains open.LOCALCCNIMPORTANT: Do not attempt to stop the chiller by openingan isolating knife switch. High intensity arcing may occur.CCN LOCAL