York YK M3 M3 G4 Preventive Maintenance, Compressor Motor, Pressure Testing, Cooler and Condenser

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SECTION 8

PREVENTIVE MAINTENANCE

It is the responsibility of the owner to provide the nec- essary daily, monthy and yearly maintenance require- ments of the system. IMPORTANT – If a unit failure occurs due to improper maintenance during the war- ranty period; YORK will not be liable for costs incurred to return the system to satisfactory operation.

In any operating system it is most important to provide a planned maintenance and inspection of its function- ing parts to keep it operating at its peak efficiency. Therefore, the following maintenance should be per- formed when prescribed.

COMPRESSOR

1.Oil Filter – The oil filter must be changed when the oil pressure drops 30% or semi-annually if not re- quired earlier.

When the oil filter is changed, it should be inspected thoroughly for any aluminum particles which would indicate possible bearing wear. If aluminum particles are found this should be brought to the attention of the nearest YORK office for their further investiga- tion and recommendations.

2.Oil Changing – The oil in the compressor must be changed annually or earlier if it becomes dark or cloudy.

COMPRESSOR MOTOR

1.Check motor mounting screws frequently to insure tightness.

2.Meg motor windings annually to check for deterio- ration of windings.

PRESSURE TESTING

The unit should be pressure tested annually. Any leaks found must be repaired immediately. Air and moisture are the worst enemies of these systems and experi- ence has shown that units which are maintained tight, are systems that provide trouble free efficient opera- tion.

COOLER AND CONDENSER

The major portion of maintenance on the condenser and cooler will deal with the maintaining the water side of the condenser and cooler in a clean condition.

The use of untreated water in cooling towers, closed water systems, etc. frequently results in one or more of the following:

1.Scale Formation.

2.Corrosion or Rusting.

3.Slime and Algae Formation.

It is therefore to the benefit of the user to provide for proper water treatment to provide for a longer and more economical life of the equipment. The following recom- mendation should be followed in determining the con- dition of the water side of the condenser and cooler tubes.

1.The condenser tubes should be cleaned annually or earlier if conditions warrant. If the temperature difference between the water off the condenser and the condenser liquid temperature is more than 4° greater than the difference recorded on a new unit, it is a good indication that the condenser tubes re- quire cleaning.They should be cleaned as instructed on pages 38 to 39 of this manual.

2.The cooler tubes under normal circumstances will not require cleaning. If however the temperature dif- ference between the refrigerant and the chilled wa- ter increases slowly over the operating season, it is an indication that the cooler tubes may be fouling or that there may be a water by-pass in the water box requiring gasket relacement or refrigerant may have leaked from the chiller.

OIL RETURN SYSTEM

1.Change the dehydrator in the oil return system semi- annually or earlier if the oil return system fails to operate.

2.When the dehydrator is changed, the nozzle of the

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YORK INTERNATIONAL

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Page 57 Page 59
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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