York YK M3 M3 G4 operation manual Compressor Switch, Display Messages

Page 22

7. Press PROGRAM key.

8. PROGRAM MODE, SELECT SETPOINT is displayed.

9. Press MODE key.

10.The mode that has been previously selected will be displayed as follows:

LOCAL MODE SELECTED

– or –

SERVICE MODE SELECTED

– or –

REMOTE MODE SELECTED

11.Press ADVANCE DAY key to scroll to desired mode. Each time this key is pressed, a different mode is displayed as above:

12.When the desired mode is displayed, press EN- TER key.

13. PROGRAM MODE, SELECT SETPOINT is displayed.

14.Press ACCESS CODE key to exit PROGRAM mode and terminate access to PROGRAM mode.

15. ACCESS TO PROGRAM MODE DISABLED is displayed.

COMPRESSOR SWITCH

(See Fig. 13, page 19.)

This rocker switch is used to locally operate the com- pressor. It is used to start, run and stop the compres- sor. Also, it resets the Control Center after a safety shutdown.

To START* chiller compressor in LOCAL mode:

Move COMPRESSOR switch from STOP/RESET to START position. Switch will spring-return to RUN position.

To STOP compressor:

Move switch from RUN to STOP/RESET position.

To RESET Control Center:

Following a safety shutdown, the operator is re- quired to reset the Control Center prior to restart- ing the system. Move switch from RUN to STOP/ RESET position.

*NOTE: The operator cannot start the compressor (us- ing this switch) when the Control Center is in REMOTE mode.

DISPLAY MESSAGES

The following displayed messages will be automatically displayed unless the operator is requesting additional information via the keypad.

SYSTEM RUN - CURRENT LIMIT IN EFFECT

Displayed when the chiller is running, and the motor current is equal-to or greater-than the operator-pro- grammed “XXX % FLA” current limit value. When the motor current reaches 100% of this value, the pre- rotation vanes are not permitted to open further. If the current continues to rise to 104% of this value, the vanes will be driven closed – not fully closed; only far enough to allow the current to decrease to a value less

than 104% of the operator-programmed “XXX % FLA” current limit.

For example:

With the operator-programmed “% CURRENT LIMIT” set at 50% and the FLA of the chiller equal to 200A, the current limit circuit would perform as follows:

(100%) (50% x FLA) = Vanes inhibited from open- ing further.

(104%) (50% x FLA) = Vanes driven toward close position.

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YORK INTERNATIONAL

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Contents Centrifugal Liquid Chillers With Microcomputer Control CenterTable of Contents Nomenclature Description of System and Fundamentals of Operation SectionSystem Operation Description See Fig Detail a Compressor Prerotation Vanes Capacity ControlSection Microcomputer Control Center Microcomputer Control Center and KeypadIntroduction Condenser Refrigerant LevelOperation 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 Microcomputer Control Center Press Access Code keyProgramming 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 Then Function Jumper PositionTherefore MON Xxxx AM High Line Voltage MON Xxxx AM High Speed Drain Temp OIL Heaters Checking the OIL Level in the OIL System Operating ProceduresSTART-UP Procedure ReservoirSTART-UP Chiller OperationCondenser Water Temperature Control Chiller Starting Sequence & Shutdown SequenceChecking Operation EcwtLchwt Operating LOG SheetWeekly Operating Inspections See SectionDaily QuarterlySafety Shutdowns Need for Maintenance or ServiceNormal and Safety System Shutdowns Cycling ShutdownsProlonged Shutdown START-UP After Prolonged ShutdownSystem Components Description System ComponentsCompressor Lubrication System See Fig GeneralCompressor Speed Increasing GearsSchematic Drawing YK Compressor Lubrication System Heat Exchangers OIL HeaterMotor Driveline Refrigerant Flow ControlSolid State Starter Optional Microcomputer Control Center See SectionVariable Speed Drive Optional OIL Return System Operational MaintenanceChanging the Dehydrator OIL Charging Procedure OIL ChargeTroubleshooting RiseLEP Operating Setpoints System After Service Symptom High Cooler Pressure Operating Analysis ChartSymptom Abnormally LOW Suction Pressure Symptom no OIL Pressure When System Start Button PushedSymptom Reduced OIL Pump Capacity Symptom OIL Pump Vibrates or is NoisySymptom OIL Pump Fails to Deliver OIL Pressure OIL Pressure display keyLeak Testing During Operation MaintenanceConducting R-22 Pressure Test Vacuum Testing System PressuresVacuum Dehydration OperationChecking the Refrigerant Charge During Unit Shutdown Refrigerant ChargingRefrigerant 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 ControlsCompressor Motor Preventive MaintenancePressure Testing 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.

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