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York YK M3 M3 G4 THRU YK S6 S4 J2, YK LB LB G4 THRU YK SE SC J4 operation manual Capacity Control

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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CAPACITY CONTROL

7619A(D)

DETAIL A – COMPRESSOR PREROTATION VANES

FORM 160.49-O2

design conditions. However, most systems will be called upon to deliver full load capacity for only a relatively small part of the time the unit is in operation.

CAPACITY CONTROL

The major components of a chiller are selected for full load capacities, therefore capacity must be controlled to maintain a constant chilled liquid temperature leaving the cooler. Prerotation vanes (PRV), located at the en- trance to the compressor impeller, compensate for varia- tion in load (See Fig. 2. Detail A).

The position of these vanes is automatically controlled through a lever arm attached to an electric motor lo- cated outside the compressor housing. The automatic adjustment of the vane position in effect provides the performance of many different compressors to match various load conditions from full load with vanes wide open to minimum load with vanes completely closed.

COMPRESSOR

PREROTATION VANES (See Detail A)

DISCHARGE

SUCTION

DISCHARGE

BAFFLE

COOLER

CONDENSER

ELIMINATOR

SUB-COOLER

FLOW CONTROL

ORIFICE

LD00924

FIG. 2 – REFRIGERANT FLOW-THRU CHILLER

OIL COOLER

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 operation manual Capacity Control

FAQ

What are compressor prerotation vanes?

Compressor prerotation vanes (PRV) are located at the entrance to the compressor impeller and compensate for variation in load by automatically adjusting their position.

How does the capacity control system work?

The capacity control system uses compressor prerotation vanes to match various load conditions, from full load with vanes wide open to minimum load with vanes completely closed.

What components are selected for full load capacities in a chiller?

The major components of a chiller are selected for full load capacities, and capacity control is necessary to maintain a constant chilled liquid temperature leaving the cooler.

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