Manuals / York / Household Appliance / Heat Pump

York YK M3 M3 G4 THRU YK S6 S4 J2, YK LB LB G4 THRU YK SE SC J4 operation manual Megging The Motor

Models: YK M3 M3 G4 THRU YK S6 S4 J2, YK LB LB G4 THRU YK SE SC J4 YK M3 M3 G4

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HANDLING REFRIGERANT FOR

FORM 160.49-O2

HANDLING REFRIGERANT FOR

DISMANTLING AND REPAIRS

If it becomes necessary to open any part of the refriger- ant system for repairs, it will be necessary to remove the charge before opening any part of the unit.

MEGGING THE MOTOR

While the main disconnect switch and compressor motor starter are open, meg the motor as follows:

1.Using a megohm meter (megger), meg between phases and each phase to ground (see Fig. 23); these readings are to be interpreted using the graph shown in Fig. 24.

2.If readings fall below shaded area, remove external leads from motor and repeat test.

NOTE: Motor is to be megged with the starter at ambient temperature after 24 hours of idle standby.

LD00475

FIG. 23 – DIAGRAM, MEGGING MOTOR WINDINGS

YORK INTERNATIONAL

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York YK M3 M3 G4 THRU YK S6 S4 J2, YK LB LB G4 THRU YK SE SC J4 Handling Refrigerant For Dismantling And Repairs

FAQ

When is it necessary to remove the charge before opening any part of the unit?

It is necessary to remove the charge before opening any part of the unit when it becomes necessary to open any part of the refrigerant system for repairs.

How should I meg the motor of the heat pump?

While the main disconnect switch and compressor motor starter are open, meg the motor using a megohm meter megger between phases and each phase to ground as illustrated in Fig. 23.

What is the ideal condition for megging the motor?

The motor is to be megged with the starter at ambient temperature after 24 hours of idle standby.

Contents

W ARNING MILLENNIUM TMREFERENCE INSTRUCTIONS TABLE OF CONTENTSDESCRIPTION FORM NOR-134a NOMENCLATURER-22UNITS SYSTEM OPERATION DESCRIPTION See Fig SECTIONCAPACITY CONTROL FIG. 3 - MICROCOMPUTER CONTROL CENTER AND KEYPAD SECTION MICROCOMPUTER CONTROL CENTERINTRODUCTION DISPLAYING SYSTEM PARAMETERS CONTROL CENTEROPERATION To Display REFRIGERANT PRESSURE To Display CHILLED LIQUID TEMPERATURESTo Display OIL PRESSURE To Display SSS MOTOR CURRENT / VOLTSTo Display MOTOR CURRENT is displayedTo Display OPERATING HOURS and STARTS COUNTER SYSTEM SETPOINTSPage DISPLAYING SYSTEM SETPOINTS Solid State Starter Applications Only To Display REMOTE RESET TEMP RANGE Setpoint1.Press ACCESS CODE key PROGRAMMINGTHE MICROCOMPUTER CONTROL CENTER PROGRAMMING SYSTEM SETPOINTSSolid State Starter, refer to Fig Electro-MechanicalStarter, refer to FigTo Enter PULL DOWN DEMAND Setpoint Refer to Fig 3.Press and release ADVANCE DAY/SCROLL key.The following prompt message is displayed To Enter REMOTE/ RESET TEMP RANGE Setpoint Refer to Fig PRE-ROTATIONVANES KEYS SERVICE KEYSOTHER SERVICE KEYS 1.Press ACCESS CODE key OPERATING MODESDISPLAY MESSAGES COMPRESSOR SWITCHTherefore SYSTEM SHUTDOWN MESSAGES when Control Center is in REMOTE mode Phase rotation/loss JUMPER POSITION FUNCTIONSolid State Starter applications only Solid State Starter applications onlySolid State Starter applications only MON XX XX AM - HIGH SPEED DRAIN TEMP MON XX XX AM - AUX SAFETY SHUTDOWNMON XX XX AM - OPEN DRAIN TEMP THERMOCOUPLE MON XX XX AM - DC UNDERVOLTAGESTART-UPPROCEDURE fused disconnect switch to the starter orSECTION and remains energized as long as theCHILLER OPERATION OPERATOR INITIATED Condenser Water Temperature ControlSYSTEM STARTING & SHUTDOWN SEQUENCE OPERATING LOG SHEET CHECKING OPERATIONDaily OPERATING INSPECTIONS - See SectionWeekly QuarterlyNORMAL AND SAFETY SYSTEM SHUTDOWNS NEED FOR MAINTENANCE OR SERVICESAFETY SHUTDOWNS CYCLING SHUTDOWNSSTART-UPAFTER PROLONGED SHUTDOWN PROLONGED SHUTDOWNSYSTEM COMPONENTS DESCRIPTION SECTIONFRONT VIEW 27385ACOMPRESSOR GENERALCAPACITY CONTROL COMPRESSOR LUBRICATION SYSTEM See FigLD00951 MOTOR DRIVELINE OIL HEATERHEAT EXCHANGERS REFRIGERANT FLOW CONTROLSOLID STATE STARTER Optional MICROCOMPUTER CONTROL CENTER See SectionVARIABLE SPEED DRIVE Optional ACTUAL LEVEL = XXX% LEVEL SETP = XXX%OIL RETURN SYSTEM OPERATIONAL MAINTENANCESECTION THE OIL CHARGE OIL CHARGING PROCEDURESECTION TROUBLESHOOTINGYORK INTERNATIONAL YORK INTERNATIONAL 2. SYMPTOM ABNORMALLY LOW SUCTION PRESSURE 1. SYMPTOM ABNORMALLY HIGH DISCHARGE PRESSURE3. SYMPTOM HIGH COOLER PRESSURE RESULTS11. SYMPTOM REDUCED OIL PUMP CAPACITY 7. SYMPTOM OIL PUMP VIBRATES OR IS NOISYRESULTS POSSIBLE CAUSESECTION LEAK TESTING DURING OPERATIONRENEWAL PARTS CHECKING SYSTEM FOR LEAKSVACUUM TESTING VACUUM DEHYDRATION DURING UNIT SHUTDOWN REFRIGERANT CHARGINGCHECKING THE REFRIGERANT CHARGE MEGGING THE MOTOR HANDLING REFRIGERANT FOR DISMANTLING AND REPAIRSLD00476 Open MotorsTUBE CLEANING PROCEDURES CLEANING COOLER AND CONDENSER TUBESCOMMERCIAL ACID CLEANING GENERALTESTING FOR COOLER AND CONDENSER TUBE LEAKS ELECTRICAL CONTROLS COMPRESSORSECTION PRESSURE TESTINGCOMPRESSOR COMPRESSOR MOTORELECTRICAL CONTROLS Copyright by York International Corporation P.O. Box 1592, York, Pennsylvania USAALL RIGHTS RESERVED Form 160.49-O21296