York YK M3 M3 G4 operation manual Control Center, Operation, Displaying System Parameters

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CONTROL CENTER

The Control Center front panel layout consists of five key groups, one switch and a 1 line by 40 character al- phanumeric vacuum fluorescent display: (see Fig. 3.)

CHARACTERISTIC DISPLAY – The alphanumeric vacuum fluorescent display is located to the right of the STATUS key. All messages, parameters, set points, and data can be viewed at this location. The main communi- cations between the operator or service technician and the MicroComputer Control Center occurs on this dis- play.

DISPLAY – Provide a direct readout of each monitored parameter on the alphanumeric display.

ENTRY – These keys are used to enter the values for the operator programmed setpoints.These keys are used in conjunction with the Setpoint keys while in PRO- GRAM mode.

SETPOINTS – These keys are used as follows:

1.To view each setpoint, in any mode, or

2.To select the individual setpoints that are programmed by the operator in PROGRAM mode only.

Pressing the appropriate key enables the operator to program that setpoint pressing the Entry keys.

SERVICE – Included in this group of keys are those func- tions that are only relevant to servicing the chiller.

Typically, these keys would not be used for daily chiller operation.

ACCESS CODE – Permits operator to access the pro- gram.

PROGRAM – Permits operator to program the Control Center.

MODE – Permits operator to check what mode the Con- trol Center is presently in (LOCAL, REMOTE or SER- VICE).

1.Service – allows manual PRV control with visual display readout of PRV operation.

2.Local – allows manual compressor start from the COMPRESSOR switch on the Control Center front.

3.Program – allows operator programming of system setpoints.

4.Remote – allows remote start, remote stop of com- pressor and remote reset of LCWT and % current limit.

COMPRESSOR-START, RUN, STOP/RESET SWITCH – This 3-position rocker switch is used to start (except in REMOTE mode), stop/run/reset the system.

OPERATION

DISPLAYING SYSTEM PARAMETERS

The Display keys are used to display selected monitored parameters as follows: (Refer to Fig. 3.)

•Press and release the appropriate Display key – the message will be displayed for 2 seconds.

–or –

•Press and hold the appropriate Display key – the mes- sage will be displayed and updated every 0.5 sec- onds until the Display key is released.

–or –

•Press and release appropriate Display key, then press and release the DISPLAY HOLD key – the message

will be displayed and updated every 2 seconds until the DISPLAY HOLD key is again pressed and re- leased, or 10 minutes have elapsed, whichever comes first.

NOTE: If the display actually displays X’s, then the monitored parameter is out of normal operat- ing range (refer to Fig. 4). If the “English/Metric” jumper is installed on the Micro Board, all tem- peratures are displayed in degrees Fahrenheit (°F) and all pressures are displayed in pounds per sq. inch gauge (PSIG) except oil pressure which is displayed in pounds per sq. inch differ- ential (PSID). If the “English/Metric” jumper is not installed, all temperatures are displayed in degrees Centigrade (°C) and all pressures are displayed in Kilo-Pascals (kPa).

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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

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