York YK M3 M3 G4 To Display Motor Current, To Display Operating Hours and Starts Counter

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To Display CONDENSER LIQUID TEMPERATURES (Field Installed Option Package):

Use CONDENSER LIQUID TEMPS display key as described above to produce the following alphanu- meric display message:

COND LEAVING = XXX.X°F; RETURN = XXX.X°F

NOTE: If the condenser liquid thermistors are not con- nected, or both thermistors are “out of range”, the display will blank when this key is pressed.

To Initiate a PRINT to Printer:

Press the PRINT key to initiate a printout to an op- tional printer. When the key is pressed,

PRINT ENABLE

is displayed.

Refer to “MicroComputer Control Center – System Status Printers” instruction, Form 160.49-N7 for de- tails of the optional printers.

To Display MOTOR CURRENT:

Press the % MOTOR CURRENT display key as described above to display motor current as a per- cent of Full Load Amps (FLA). The message is as follows:

MOTOR CURRENT = XXX% FLA

NOTE: • Liquid-Cooled Solid State Starter Applications

–the % Motor Current displayed is the highest of three line currents divided by the programmed chiller FLA value x 100%.

•Electro-Mechanical Starter Applications – the % Motor Current displayed is the highest of the three line currents.

To Display OPERATING HOURS and STARTS COUNTER:

Use the OPERATING HOURS key as described on page 8, to produce the following message:

OPER. HOURS = XXXXX; START COUNTER = XXXXX

NOTE: The operating hours and starts counter can be reset to zero. Refer to “Programming the Micro-

Computer Control Center”, page 14. However, the purpose of the OPERATING HOURS key is to display the total accumulated chiller run time. Therefore, the operating hours should not be arbitrarily reset.

SYSTEM SETPOINTS

The system setpoints may be programmed by the sys- tem operator. The Setpoints keys are located on the Control Center keypad (see Fig. 3).To program, see “Pro- gramming System Setpoints”, page 14. The following is a description of these setpoints (with the English/ Metric jumper installed on the Micro Board):

CHILLED LIQUID TEMP – This key displays the leav- ing chilled water temperature (LCWT) setpoint in degrees Fahrenheit. If not programmed, the default value is 45°F. See “Programming System Setpoints”, page 15).

NOTE: If an Energy Management System is interfaced to the Control Center for the purpose of remote LCWT setpoint reset, then the operator-pro- grammed chilled liquid temperature will be the base or lowest setpoint available to the Energy Management System (EMS). This chilled liquid temperature value must also be entered into the EMS. Further, any subsequent change to this value must also be entered into the EMS.

%CURRENT LIMIT – This key displays the maximum value of motor current permitted by its programmed set- ting. The value is in terms of percent of Full Load Amps (FLA). If not programmed, the default value is 100%. (See “Programming System Setpoints”, page 15.)

If chiller is equipped with a YORK Solid State Starter, the system FLA is also displayed. This value is pro- grammed by the factory and should never be changed. The Micro Board uses this value to calculate and dis- play the % motor current parameter that is displayed when the % MOTOR CURRENT display key is pressed. Also, proper current limit control depends on the cor- rectly programmed FLA value. For security reasons, a special access code is required to program the FLA value. It should only be changed by a service technician.

PULL DOWN DEMAND – This function is used to pro- vide energy savings following the chiller start-up. This key displays a programmable motor current limit and a programmable period of time. Operation is as follows: Whenever the system starts, the Pull Down Demand Limit is maintained for the programmed time, then the current limit control returns to % current limit setpoint. The maximum permitted motor current is in terms of % FLA. The duration of time that the current is limited is in

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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

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