York YK M3 M3 G4 System Operating Procedures, OIL Heaters Checking the OIL Level in the OIL

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SECTION 3

SYSTEM OPERATING PROCEDURES

WARNING

OIL HEATERS

CHECKING THE OIL LEVEL IN THE OIL

If the oil heater is de-energized during a shut-

RESERVOIR

 

down period, they must be energized for 12 hours

Proper operating oil level – the middle of the up-

prior to starting compressor, or remove all oil and

per sight glass.

recharge compressor with new oil. (See “Charg-

 

ing Unit With Oil”, page 43.)

If the oil is excessively high after start-up, the

 

NOTE: The oil heater is thermostatically controlled

excess oil may be drained from the oil filter drain

valve while the compressor is running.

and remains energized as long as the

 

fused disconnect switch to the starter or

If oil level is low, oil should be added to the com-

turbo-modulator is energized.

pressor. (See “Charging Unit With Oil”, page 43.)

 

 

START-UP PROCEDURE

PRE-STARTING

Prior to starting the chiller, observe the MicroCom- puter Control Center. Make sure the display reads

SYSTEM READY TO START .

To pre-start the chiller, use the following procedure:

1.Oil Heater – The oil heater must be energized for 12 hours prior to starting the chiller. The unit will not start if the oil is less than 71°F. If not possible the compressor oil should be drained and new oil must be charged into the oil sump. (See “Charging Unit With Oil”, page 43.)

2.Oil Pump – To check, press and release the MANUAL OIL PUMP key under Service on the Control Center. The oil pump will run for 10 min- utes and shut down. Press and release the MANUAL OIL PUMP key to stop the operation of the oil pump for less than 10 minutes of operation.

3.Pre-Rotation Vanes – To perform this test the starter interlock terminals 3 and 4 must be jumpered to allow vanes to open (remove the jumper after test). Make sure the Control Center is in the SERVICE mode, then press the prerotation vanes OPEN and CLOSE keys to observe the operation of the prerotation vanes. The Control Center supplies a signal to operate the prerotation vanes. The movement of the vanes will be dis-

played on the Control Center. The display readout is active whenever power is supplied to the Con- trol Center. Return from the SERVICE mode to LOCAL, PROGRAM, or REMOTE mode to suit the method of operation selected for the chiller application. Refer to “Section 2”.

4.% Current Limit – Press the % CURRENT LIMIT setpoint key on the Control Center. The “Display”

should read CURRENT LIMIT = 100% FLA on (Solid State Starter units only, the display is

CURRENT LIMIT = 100% FLA, MTR CUR = XXXX FLA )

if the Control Center was not programmed. If the setpoint is not 100% and was predetermined for the job application the Control Center should be programmed to that specification. To program, re- fer to “Section 2”.

5.All Control Center setpoints should be programmed before the chiller is started. (Refer to “Section 2”.) Prior to start, the clock must be programmed for the proper day and time. Any setpoints which are desired to be changed may be programmed. If not programmed the “default” value setpoints are as follows:

LCWT = 45°F

%Current Limit = 100% FLA Pulldown Demand = None Clock = Sun 12:00 A.M. Daily Schedule = None Holiday = None

Remote Reset Temp. Range = 20°F Data Logger = No operation

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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 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 Function Jumper Position ThenTherefore 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 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 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 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 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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