York YK M3 M3 G4 operation manual System Shutdown Messages

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at 265 PSIG (R-22); 180 PSIG (R-134a). When the con- denser pressure falls to 245 PSIG (R-22); 160 PSIG (R-134a), the vanes will be permitted to open.

SYSTEM RUN – PRESSURE STATUS

Displayed when the chiller is running. It instructs the operator to press the STATUS key, whereupon one of the following messages will be displayed:

•WARNING: COND OR EVAP TRANSDUCER ERROR

Indicates a probable condenser or evaporator trans- ducer problem, because the output is unreasonable. The microprocessor arrives at this conclusion by subtracting the evaporator transducer output from the condenser transducer output. The result must be zero or some positive number. If the result is a nega- tive number, it concludes that there is a probable condenser or evaporator transducer problem. This function is inhibited for the first 10 minutes of chiller run-time, and is checked every 10 minutes thereaf- ter. Message is reset by pressing the WARNING RE- SET key in the Service mode.

NOTE: If the STATUS key is arbitrarily pressed, with- out the operator being prompted by the PRESS STATUS message, the following message shall be displayed.

NO MALFUNCTION DETECTED

WARNING – REFRIGERANT LEVEL OUT OF RANGE

Displayed when the refrigerant level sensor output goes to > 4.4VDC. While this is displayed, the variable ori- fice is driven open until the level is within range. This message is automatically cleared when output is within range.

SYSTEM RUN – LEAVING TEMP CONTROL

Displayed while the chiller is running. Indicates that the pre-rotation vanes are being controlled by the leaving chilled water temperature (LCWT). This is the normal mode of chiller operation. Thus, if the LCWT is above the setpoint, but pulling down rapidly, the vanes will pulse closed as the LCW nears the setpoint.

SYSTEM READY TO START

Indicates that the system is not running, but will start upon application of a start signal.

SYSTEM SHUTDOWN – PRESS STATUS

Displayed when chiller is shut down on a cycling shut- down, safety shutdown (operator must move the COM- PRESSOR switch to STOP/RESET in order to restart) or operator-initiated shutdown (within 30 minutes of

initial start-up). The status message consists of the day and time of shutdown, cause of shutdown, and type of restart required. Upon pressing STATUS key, System Shutdown Message will be displayed for 2 sec- onds and then return to

SYSTEM SHUTDOWN – PRESS STATUS

Display can be held indefinitely by depressing DIS- PLAY key. For examples of System Shutdown Mes- sages, see below.

SYSTEM SHUTDOWN MESSAGES

Day of Week

Cause of Shutdown

Time of Day

Type of Restart

 

 

MON 10:00 AM – LOW

WATER TEMP – AUTOSTART

 

 

Chiller was shut down on Monday at 10:00 AM be- cause the LCWT has decreased to a value that is 4°F below the operator-programmed chilled liquid tempera- ture setpoint. However, if the setpoint is less than 40°F, the chiller will always shut down at 36°F. Further, if the chiller is running and the setpoint is changed, the (Low Water Temperature) cutout will be 36°F for 10 minutes in order to eliminate nuisance trips. Finally, for brine chilling applications, the LWT cutout is always 4°F be- low the setpoint. (The water jumper on the Micro Board must be removed for a brine unit.)

MON XX:XX AM – FLOW SWITCH – AUTOSTART

Chiller is shut down because a chilled-liquid flow switch has opened. The flow switch must open for a minimum of 2 seconds in order to cause a shutdown. The flow switch is checked 25 seconds into “Start Sequence Initiated” and continuously thereafter.

MON XX:XX AM – SYSTEM CYCLING – AUTOSTART

A remote command (computer relay contact or manual switch) connected to the Remote/Local cycling input of the digital input board has shut down the chiller.

MON XX:XX AM – MULTI UNIT CYCLING – AUTOSTART

Lead/Lag sequence control accessory has shut down the chiller.

MON XX:XX AM – POWER FAILURE – AUTOSTART

The chiller is shut down because there has been a power interruption or failure. The chiller will automati- cally restart when power is restored. This message

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YORK INTERNATIONAL

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Contents Centrifugal Liquid Chillers With Microcomputer Control CenterTable of Contents Nomenclature Section Description of System and Fundamentals of OperationSystem Operation Description See Fig Detail a Compressor Prerotation Vanes Capacity ControlSection Microcomputer Control Center Microcomputer Control Center and KeypadIntroduction Condenser Refrigerant LevelControl Center OperationDisplaying System Parameters To Display Chilled Liquid Temperatures To Display OIL PressurePsid = HOP LP Offset Pressure To Display Motor Current To Display Operating Hours and Starts CounterSystem Setpoints See Programming System Setpoints, Displaying System Setpoints To Display Undervoltage setpoints Press Access Code key ProgrammingMicrocomputer Control Center Programming System SetpointsElectro-Mechanical Starter, refer to Fig Solid State Starter, refer to FigKeypad Programming Pull Down Demand Setpoint SetpointKeypad Programming Daily Schedule Setpoint Keypad Programming Holiday Service Keys PRE-ROTATION Vanes KeysOther Service Keys Pulldn Level = XXX% Setp = XXX% Actual = XXX%Operating Modes Compressor Switch Display MessagesSystem RUN Auto Vanes System Shutdown Messages When Control Center is in Remote mode MON Xxxx AM Evap Trans or Probe Error Function Jumper Position ThenTherefore MON Xxxx AM High Line Voltage MON Xxxx AM High Speed Drain Temp System Operating Procedures START-UP ProcedureOIL Heaters Checking the OIL Level in the OIL ReservoirSTART-UP Chiller OperationCondenser Water Temperature Control Chiller Starting Sequence & Shutdown SequenceEcwt LchwtChecking Operation Operating LOG SheetOperating Inspections See Section DailyWeekly QuarterlyNeed for Maintenance or Service Normal and Safety System ShutdownsSafety Shutdowns Cycling ShutdownsProlonged Shutdown START-UP After Prolonged ShutdownSystem Components Description System ComponentsGeneral CompressorCompressor Lubrication System See Fig Speed Increasing GearsSchematic Drawing YK Compressor Lubrication System OIL Heater Motor DrivelineHeat Exchangers Refrigerant Flow ControlMicrocomputer Control Center See Section Solid State Starter OptionalVariable Speed Drive Optional Operational Maintenance OIL Return SystemChanging the Dehydrator OIL Charging Procedure OIL ChargeTroubleshooting RiseLEP Operating Setpoints System After Service Operating Analysis Chart Symptom Abnormally LOW Suction PressureSymptom High Cooler Pressure Symptom no OIL Pressure When System Start Button PushedSymptom OIL Pump Vibrates or is Noisy Symptom OIL Pump Fails to Deliver OIL PressureSymptom Reduced OIL Pump Capacity OIL Pressure display keyMaintenance Leak Testing During OperationConducting R-22 Pressure Test Vacuum Testing System PressuresVacuum Dehydration OperationRefrigerant Charging Checking the Refrigerant Charge During Unit ShutdownRefrigerant Charge Handling Refrigerant for Dismantling and Repairs Megging the MotorMotor Stator Temperature and Insulation Resistances Condensers and Coolers Testing for Cooler and Condenser Tube Leaks Compressor Electrical ControlsPreventive Maintenance Pressure TestingCompressor 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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