York YK M3 M3 G4 Other Service Keys, Pulldn Level = XXX% Setp = XXX% Actual = XXX%

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OTHER SERVICE KEYS

WARNING RESET – Press and release this key to re- set any “WARNING” or “STATUS” message that can be reset with this key, unless the condition still exists. To reset any cycling or warning message, place the Con- trol Center in SERVICE mode and press WARNING RESET key. To reset any safety shutdown message, press WARNING RESET key in SERVICE mode with the COMPRESSOR switch in the STOP/RESET posi- tion.

MANUAL OIL PUMP – This key is operational in any mode. Press and release this key to run the oil pump. Press and release the key again to stop the oil pump. A 10-minute maximum is imposed on the running of the oil pump (i.e., the oil pump will automatically shut off after 10 minutes). If a longer running time is desired, the key must be pressed again. The manual oil pump feature is disabled during “START SEQUENCE INITIALIZED” to allow for auto-zeroing of oil pressure transducers.

DISPLAY DATA – This key is operational in any three of the Control Center modes of operation (SERVICE, LOCAL or REMOTE). It is used to display certain sys- tem operating parameters that are relevant to trouble- shooting the chiller system.

Press and the DISPLAY DATA key. The following mes- sages will sequentially scroll on the display. Each mes- sage will be displayed for 2 seconds.

Messages 1 and 2 are only displayed if unit is equipped with EPROM version C.02F(T).13 or later and Refriger- ant Level Control has been enabled by a qualified ser- vice technician using the “Special Setpoints and Pro- gramming” procedures section of Service manual, Form 160.49-M3.

NO. 1

MANUAL VANE OPERATION ALLOWED – Displayed when the PRE-ROTATION VANES service keys have been se- lected for manual VANE control. This allows these keys to manually control the vanes in Service mode.The pro- cedure to select manual vanes control is in Service manual, Form 160.49-M3 and should be performed only by a qualified service technician.

– or –

NO. 1

MANUAL LEVEL CONTROL ALLOWED – Displayed when the PRE-ROTATION VANES keys have been selected for manual REFRIGERANT LEVEL control. This allows these keys to manually control the refrigerant level con- trol variable orifice in Service mode. When manual re- frigerant level control is selected, the pre-rotation vanes Service keys cannot be used to control the vanes. The

procedure to select manual refrigerant level control is in Service manual, Form 160.49-M3 and should be per- formed only by a qualified service technician.

NO. 2

PULLDN LEVEL = XXX%; SETP = XXX%; ACTUAL = XXX%

–Displayed when there is a refrigerant level setpoint pulldown (ramp) in effect. PULLDN LEVEL is the refrig- erant level setpoint that is presently in effect. SETP is the refrigerant level setpoint that has been programmed by the service technician and ACTUAL is the refrigerant level in the condenser. The pulldown period is 15 min- utes in duration. During the pulldown period, a linearly increasing ramp is applied to the level setpoint. This causes the setpoint to increase from 0% to the pro- grammed value over a period of 15 minutes. After the 15 minutes have elapsed, the setpoint remains the pro- grammed value and this message is replaced by the message ACTUAL = XXX%; LEVEL SETP = XXX% as described below.

A refrigerant level setpoint pulldown is put into effect when the vanes are driven from a fully closed to an open posi- tion, if the actual refrigerant level is less than the level setpoint when the vane motor end switch (VMS) opens. If the actual level is greater than the setpoint when the VMS opens, the level is controlled to the programmed setpoint. Whenever the vanes go to the fully closed po- sition (VMS closed), any pulldown that is in effect is can- celled.

– or –

NO. 2

ACTUAL LEVEL = XXX%; LEVEL SETP = XXX% – Displays

the actual refrigerant level in the condenser and the re- frigerant level setpoint programmed by the service tech- nician. This message replaces the previous message after a refrigerant level setpoint pulldown period termi- nates.

NO. 3

SAT TEMPS EVAP = XX.X°F; COND = XX.X°F – This is the refrigerant saturation temperatures for the evaporator and condenser.

NO. 4

DISCHARGE TEMP = XXX.X°F; OIL TEMP = XXX.X°F

NO. 5

HOP = XX.X PSIG; LOP = XX.X PSIG – This is the low oil pressure (LOP) as measured at the oil sump and the high oil pressure (HOP) as measured at the compres- sor bearing input.

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YORK INTERNATIONAL

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Contents Centrifugal Liquid Chillers With Microcomputer Control CenterTable of Contents Nomenclature System Operation Description See Fig SectionDescription of System and Fundamentals of Operation Detail a Compressor Prerotation Vanes Capacity ControlSection Microcomputer Control Center Microcomputer Control Center and KeypadIntroduction Condenser Refrigerant LevelDisplaying 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 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 Therefore Function Jumper PositionThen 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 ControlVariable Speed Drive Optional Microcomputer Control Center See SectionSolid State Starter Optional Changing the Dehydrator Operational MaintenanceOIL Return System 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 keyConducting R-22 Pressure Test MaintenanceLeak Testing During Operation Vacuum Testing System PressuresVacuum Dehydration OperationRefrigerant Charge Refrigerant ChargingChecking the Refrigerant Charge During Unit Shutdown 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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