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

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will be displayed if the Micro Board is configured for AUTO-RESTART AFTER POWER FAILURE. The Mi- cro Board is factory set for manual restart after power failure. To convert it to auto-restart after power failure, remove one of the two-pin program jumpers from the cloth bag located inside the Control Center and place it on the terminals labeled “Auto R” (J60) on the Micro Board.

MON XX:XX AM – POWER FAILURE

The chiller is shut down because there has been a power interruption or failure. When power is restored, the chiller can be restarted by pressing the COMPRES- SOR switch to STOP/RESET position and then to START position. This message will be displayed if the Micro Board is configured for MANUAL RESTART AF- TER POWER FAILURE. The Micro Board is factory set for manual restart after power failure. This has been accomplished by removing the two-pin jumper from the terminals labeled “Auto R” (J60) on the Micro Board.

AC UNDERVOLTAGE – AUTOSTART

The chiller is shut down because the MicroComputer Control Center was in RUN mode, displaying

SYSTEM RUN – LEAVING TEMP CONTROL , but the motor current was less than 10% FLA for 25 continuous sec- onds. This is indicative of an AC undervoltage condi- tion that has caused the start relay (1R) in the Micro- Computer Control Center to de-energize. This condi- tion is checked when the MicroComputer Control Cen- ter goes into RUN mode (after 30 second pre-lube). This condition can be caused by failure of any compo- nent that would cause a loss of the start signal from the Control Center. In essence, this check assures that the compressor is running when the Control Cen- ter is displaying

SYSTEM RUN – LEAVING TEMP CONTROL .

This check is not performed when program jumper JP4 is removed (Steam Turbine applications).

MON XX:XX AM – INTERNAL CLOCK – AUTOSTART

The operator-programmed daily stop schedule has shut down the chiller. The chiller will automatically restart when the operator-programmed daily start schedule indicates a start. It can be overriddden by pressing the COMPRESSOR switch to the START position.

REMOTE STOP

This message will be displayed when a remote device (typically an Energy Management System) has com- manded the chiller to shut down. The chiller will restart upon application of a separate start signal from the remote device. This message will only be displayed

FORM 160.49-O2

when Control Center is in REMOTE mode.

ANTI-RECYCLE, XX MIN LEFT

The chiller may not restart more frequently than every 30 minutes. Displayed when chiller is shut down and there is time remaining on the anti-recycle timer. In normal operation, chiller cannot be restarted until

ANTI-RECYCLE, 00 MIN LEFT is displayed. However, when servicing the chiller, it may be desirable to inhibit this 30-minute timer. If so, simply install a jumper plug in the unmarked terminals of the Micro Board directly under Auto-Restart jack.

This feature eliminated when program jumper JP4 is removed (Steam Turbine applications).

WARNING: Remove this jumper after servicing. Failure to do this voids the Warranty.

MON XX:XX AM – LOW EVAP PRESSURE

The chiller is shut down because the evaporator pres- sure has decreased to 54.3 PSIG (R-22); 25.0 PSIG (R-134a). The chiller will be allowed to start when the pressure increases to 54.4 PSIG (R-22); 25.1 PSIG (R-134a). To restart chiller, press the COMPRESSOR switch to the STOP/RESET position and then to the START position.

MON XX:XX AM – LOW EVAP PRESSURE – BRINE

The chiller is shut down because the brine Low Evapo- rator Pressure (LEP, not included with standard Con- trol Center) safety contacts have opened. The brine LEP safety is located external to the Control Center. Safety cut-out settings will vary with the brine applica- tion. To restart the chiller, wait until the safety contacts close, press the COMPRESSOR switch to the STOP/ RESET position and then to the START position.

MON XX:XX AM – LOW OIL PRESSURE

The chiller is shut down because the oil pressure has decreased to 15 PSID while running, or never achieved 25 PSID prior to compressor start during the oil pump pre-lube run. The chiller will be allowed to restart when the pressure increases to 25 PSID. Differential pres- sure is sensed by two pressure transducers. To re- start chiller, press COMPRESSOR switch to STOP/ RESET position and then to the START position.

MON XX:XX AM – HIGH PRESSURE

The chiller is shut down because condenser pressure

YORK INTERNATIONAL

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Contents With Microcomputer Control Center Centrifugal Liquid ChillersTable of Contents Nomenclature Description of System and Fundamentals of Operation SectionSystem Operation Description See Fig Capacity Control Detail a Compressor Prerotation VanesMicrocomputer Control Center and Keypad Section Microcomputer Control CenterCondenser Refrigerant Level IntroductionOperation Control CenterDisplaying System Parameters To Display OIL Pressure To Display Chilled Liquid TemperaturesPsid = HOP LP Offset Pressure To Display Operating Hours and Starts Counter To Display Motor CurrentSystem Setpoints See Programming System Setpoints, Displaying System Setpoints To Display Undervoltage setpoints Programming Press Access Code keyMicrocomputer Control Center Programming System SetpointsSolid 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 Then Function Jumper PositionTherefore MON Xxxx AM High Line Voltage MON Xxxx AM High Speed Drain Temp START-UP Procedure System Operating ProceduresOIL Heaters Checking the OIL Level in the OIL ReservoirChiller Operation START-UPChiller Starting Sequence & Shutdown Sequence Condenser Water Temperature ControlLchwt EcwtChecking Operation Operating LOG SheetDaily Operating Inspections See SectionWeekly QuarterlyNormal and Safety System Shutdowns Need for Maintenance or ServiceSafety Shutdowns Cycling ShutdownsSTART-UP After Prolonged Shutdown Prolonged ShutdownSystem Components System Components DescriptionCompressor GeneralCompressor Lubrication System See Fig Speed Increasing GearsSchematic Drawing YK Compressor Lubrication System Motor Driveline OIL HeaterHeat Exchangers Refrigerant Flow ControlSolid State Starter Optional Microcomputer Control Center See SectionVariable Speed Drive Optional OIL Return System Operational MaintenanceChanging the Dehydrator OIL Charge OIL Charging ProcedureRise TroubleshootingLEP Operating Setpoints System After Service Symptom Abnormally LOW Suction Pressure Operating Analysis ChartSymptom High Cooler Pressure Symptom no OIL Pressure When System Start Button PushedSymptom OIL Pump Fails to Deliver OIL Pressure Symptom OIL Pump Vibrates or is NoisySymptom Reduced OIL Pump Capacity OIL Pressure display keyLeak Testing During Operation MaintenanceConducting R-22 Pressure Test System Pressures Vacuum TestingOperation Vacuum DehydrationChecking the Refrigerant Charge During Unit Shutdown Refrigerant ChargingRefrigerant Charge 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 CompressorPressure Testing Preventive MaintenanceCompressor Motor Cooler and CondenserElectrical 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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The YK LB LB G4 and YK SE SC J4 models further enhance York’s portfolio with their compact designs and lower installation footprints. These chillers are ideal for applications where space is at a premium. Additional features include advanced noise reduction technology, allowing for quieter operation compared to traditional HVAC systems, making them suitable for urban environments or buildings where noise control is a priority.

Furthermore, York's commitment to continuous innovation is evident in the incorporation of smart technology across its chiller series. Features such as connectivity options for monitoring and diagnostics through mobile apps or web interfaces empower users to maintain optimal system performance proactively. This connectivity aids in predictive maintenance, enabling timely interventions that extend equipment life and reliability.

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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