York YK M3 M3 G4 THRU YK S6 S4 J2, YK LB LB G4 THRU YK SE SC J4 System RUN Auto Vanes

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Therefore:

(100%) (50% x 200) = 100A = Vanes stop open- ing

(104%) (50% x 200) = 104A = Vanes driven to- ward close position.

SYSTEM RUN – AUTO VANES

Displayed when the chiller is running, the MicroCom- puter Control Center is in SERVICE mode, and the vanes are operating in AUTO mode.

SYSTEM RUN – VANES OPENING

Displayed when the chiller is running, the MicroCom- puter Control Center is in SERVICE mode with:

•The vanes operating in AUTO mode and opening to maintain the leaving chilled water temperature setpoint.

–or –

•The operator has pressed the vanes OPEN key on the keypad.

SYSTEM RUN – VANES CLOSING

Displayed when the chiller is running, the MicroCom- puter Control Center is in SERVICE mode with:

•The vanes operating in AUTO mode and closing to maintain the leaving chilled water temperature setpoint.

–or –

•The operator has pressed the vanes CLOSE key on the keypad.

SYSTEM RUN - VANES HOLDING

Displayed when the chiller is running, the MicroCom- puter Control Center is in SERVICE mode, and the operator has pressed the vanes HOLD key.

SYS READY TO START – VANES OPENING

Displayed when the chiller is running and the operator has pressed the vanes OPEN key on the keypad.

SYS READY TO START – VANES CLOSING

Displayed when the chiller is not running and the op- erator has pressed the vanes CLOSE key on the key- pad.

FORM 160.49-O2

SYS READY TO START – VANES HOLDING

Displayed when the chiller is running and the operator has pressed the vanes HOLD key on the keypad.

SYSTEM RUN – LEVEL VALVE OPENING

Displayed as a foreground message when manual re- frigerant level control has been selected using the “Spe- cial Setpoints Procedure” in Service manual, Form 160.49-M3 and operating in SERVICE mode. Indicates an “OPEN” command is being output to the variable orifice. Manual level control should be selected only by a qualified service technician.

SYSTEM RUN – LEVEL VALVE CLOSING

Displayed as a foreground message when manual re- frigerant level control has been selected using the “Spe- cial Setpoints Procedure” in Service manual, Form 160.49-M3 and operating in SERVICE mode. Indicates a “CLOSE” command is being output to the variable orifice. Manual level control should be selected only by a qualified service technician.

SYSTEM RUN – AUTO LEVEL CONTROL

Displayed as a foreground message when manual re- frigerant level control has been selected using the “Spe- cial Setpoints Procedure” in Service manual, Form 160.49-M3 and operating in SERVICE mode. Indicates that neither a “CLOSE” nor “OPEN” command is being output to the variable orifice but is in “AUTO” mode. Manual level control should be selected only by a quali- fied service technician.

SYSTEM RUN – LOW PRESSURE LIMIT IN EFFECT

Displayed when the chiller is running and the evapora- tor pressure falls to 56.2 PSIG (R-22); 27 PSIG (R- 134a). Simultaneously, the pre-rotation vanes will be prevented from further opening. This action maintains chiller operation to prevent low-evaporator-pressure shutdown at 54.3 PSIG (R-22); 25 PSIG (R-134a). When the evaporator pressure rises to 57.5 PSIG (R- 22); 28 PSIG (R-134a), the vanes will be permitted to open. Low pressure limit feature is not used when pro- gram jumper (JP3) is cut (Brine application).

SYSTEM RUN – HIGH PRESSURE LIMIT IN EFFECT

Displayed when the chiller is running and the condenser pressure rises to 246.3 PSIG (R-22); 162.5 PSIG (R- 134a). Simultaneously, the pre-rotation vanes will be inhibited from further opening. This action occurs to prevent system shutdown on high condenser pressure

YORK INTERNATIONAL

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Contents With Microcomputer Control Center Centrifugal Liquid ChillersTable of Contents Nomenclature System Operation Description See Fig SectionDescription of System and Fundamentals of Operation Capacity Control Detail a Compressor Prerotation VanesMicrocomputer Control Center and Keypad Section Microcomputer Control CenterCondenser Refrigerant Level IntroductionDisplaying System Parameters Control CenterOperation Psid = HOP LP Offset Pressure To Display Chilled Liquid TemperaturesTo Display OIL Pressure System Setpoints To Display Motor CurrentTo Display Operating Hours and Starts Counter See Programming System Setpoints, Displaying System Setpoints To Display Undervoltage setpoints Programming System Setpoints Press Access Code keyProgramming Microcomputer Control CenterSolid State Starter, refer to Fig Electro-Mechanical Starter, refer to FigSetpoint Keypad Programming Pull Down Demand SetpointKeypad Programming Daily Schedule Setpoint Keypad Programming Holiday PRE-ROTATION Vanes Keys Service KeysPulldn Level = XXX% Setp = XXX% Actual = XXX% Other Service KeysOperating Modes Display Messages Compressor SwitchSystem RUN Auto Vanes System Shutdown Messages When Control Center is in Remote mode MON Xxxx AM Evap Trans or Probe Error Therefore Function Jumper PositionThen MON Xxxx AM High Line Voltage MON Xxxx AM High Speed Drain Temp Reservoir System Operating ProceduresSTART-UP Procedure OIL Heaters Checking the OIL Level in the OILChiller Operation START-UPChiller Starting Sequence & Shutdown Sequence Condenser Water Temperature ControlOperating LOG Sheet EcwtLchwt Checking OperationQuarterly Operating Inspections See SectionDaily WeeklyCycling Shutdowns Need for Maintenance or ServiceNormal and Safety System Shutdowns Safety ShutdownsSTART-UP After Prolonged Shutdown Prolonged ShutdownSystem Components System Components DescriptionSpeed Increasing Gears GeneralCompressor Compressor Lubrication System See FigSchematic Drawing YK Compressor Lubrication System Refrigerant Flow Control OIL HeaterMotor Driveline Heat ExchangersVariable Speed Drive Optional Microcomputer Control Center See SectionSolid State Starter Optional Changing the Dehydrator Operational MaintenanceOIL Return System OIL Charge OIL Charging ProcedureRise TroubleshootingLEP Operating Setpoints System After Service Symptom no OIL Pressure When System Start Button Pushed Operating Analysis ChartSymptom Abnormally LOW Suction Pressure Symptom High Cooler PressureOIL Pressure display key Symptom OIL Pump Vibrates or is NoisySymptom OIL Pump Fails to Deliver OIL Pressure Symptom Reduced OIL Pump CapacityConducting R-22 Pressure Test MaintenanceLeak Testing During Operation System Pressures Vacuum TestingOperation Vacuum DehydrationRefrigerant Charge Refrigerant ChargingChecking the Refrigerant Charge During Unit Shutdown Megging the Motor Handling Refrigerant for Dismantling and RepairsMotor Stator Temperature and Insulation Resistances Condensers and Coolers Testing for Cooler and Condenser Tube Leaks Electrical Controls CompressorCooler and Condenser Preventive MaintenancePressure Testing Compressor MotorElectrical Controls ALL Rights Reserved

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

The York YK M3 M3 G4, YK M3 M3 G4 THRU YK S6 S4 J2, and YK LB LB G4 THRU YK SE SC J4 represent a sophisticated line of HVAC systems engineered for modern commercial applications. These models are celebrated for their innovative designs, energy efficiency, and advanced features, making them a preferred choice among facility managers and building owners.

One of the standout characteristics of the York YK series is its modular construction, which provides unparalleled flexibility in system configuration. This design allows for easy upgrades and expansions as building demands evolve. The YK M3 series, in particular, is equipped with advanced controls that enhance system performance while minimizing energy consumption. With features like variable speed drives and sophisticated control algorithms, these units optimize airflow and refrigerant use, significantly reducing operational costs.

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Finally, all these high-efficiency chillers are backed by York's renowned service support network, ensuring that customers have access to expert assistance and maintenance services whenever needed. With their exceptional features, modern technologies, and commitment to sustainability, the York YK M3 M3 G4, YK M3 M3 G4 THRU YK S6 S4 J2, and YK LB LB G4 THRU YK SE SC J4 models stand out as leaders in the commercial HVAC market, setting new standards for performance and efficiency.
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