Heatcraft Refrigeration Products 25000102 General Maintenance Schedule, Weekly, Monthly, Annually

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Parallel Compressor Systems

General Maintenance Schedule

(Service/Maintenance should be performed only by a qualified / certified refrigeration service technician.)

Weekly

Check refrigerant charge using the liquid line sight glass

Check compressor oil level

Check compressor crankcase heater operation

Check main power and control voltage

Check appearance of area around the unit

Check system pressures

Monthly

Check the refrigerant system for leaks

Check suction filters and liquid line filter driers.

Check all flanged connection bolts, fittings and line clamps for tightness.

Inspect condenser fan blades and motor mounts for cracks, loose set screws or mounting bolts.

Tighten all electrical connections.

Check operation and condition of contacts on compressor/ fan motor contactors. Check appearance of control panel interior.

Check appearance of exterior conduit/junction boxes.

Check appearance of insulation.

Check operation of auxiliary equipment.

Quarterly

With unit in stable operation, record all operating conditions:

Suction/discharge/liquid refrigerant pressure(s) and temperature(s).

System superheat, liquid subcooling, ambient temperature.

Compressor amperage.

Test all operating and safety controls.

Annually

Obtain oil sample for analysis. Change oil if required.

Clean condenser coil.

Straighten condenser fins as required.

Change liquid line filter drier and suction filter cores.

Note: The above information is provided only as a general guideline to aid servicing personnel and equipment owners in maintaining equipment. Due to variables in the actual equipment application, operating conditions, and environment recommended service intervals may vary.

Parallel Compressor Systems Installation & Operations Manual, October 2004

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Contents Parallel Compressor Systems Table of Contents Inspection IntroductionUnit Designation Model DefinitionRigging System WarrantyLocation Of Equipment Indoor Clearances Floor & Foundation RequirementsGround Mounting Location of Equipment OutdoorRoof Mounting Unit Vibration IsolationVertical Clearance Unit AccessDecorative Fences Units in PitsElectrical Ventilation Requirements Indoor UnitsRefrigerant Piping Suction P-TrapsRefrigerant Line Support Refrigerant Line InsulationExpansion Loops Table of Values for LRef. Line Amount of Expansion Equivalent Feet of Pipe Pressure Loss of Liquid RefrigerantsLiquid Line Rise in Feet Refrigerant 10’ 20’ 25’ 30’ 40’ 50’ 75’ 100’Weight of Refrigerants in Copper Lines During Operation Suction Line at Suction TemperatureLine 40F 20F Recommended Line Sizes for R-404A/R-507 Expansion Valve Liquid Line SizeLengths 100’ 150’ 200’ 25’Recommended Line Sizes for R-22 Suction Line SizeCapacity 40˚F 20˚F 10˚F 10˚F Liquid Line Size Suction TemperatureNet Recommended Remote Condenser Line Sizes12 & R-134A 502 507 & R-404A TotalLeak Checking, Evacuation and Start-up EvacuationStart-up Off-Cycle Refrigerant DistributionElectric Defrost Priority I Hot Gas DefrostSystem Balancing Electronic Control SystemSystem Superheat Evaporator SuperheatCopeland Compressors 4D/6D Solid State Modules CompressorsTypical Voltage Ranges Unloader FactorsOil Charges Oil Safety SwitchApproved Copeland Lubricants Carlyle CompressorsPhase Voltage Monitor Part Load Performance MultipliersRequired Differential Pressure for Unloader Operation Sight Glass Safety Relief Devices Sight Glass & Moisture IndicatorDischarge Piping Table Henry Relief Valve Capacity RatingManual Reset Models Auto Reset ModelsLiquid Level Switch Level Switch TableModule Replacement Oil ControlOil Separators Temprite Valve Adjustment Temprite ModelsOil Level Regulators AC&R Model Regulators Troubleshooting Oil SystemLiquid Filter-Driers & Suction Filters Sporlan Valve CoSuction Filter CompressorMotorBurnoutCleanupProcedureSporlan Valve Company Replaceable Suction FilterType AFD for cleanup Type DF for cleanupSuperior Valve Company Type F FilterField Adjustment Recommended Valve SettingsHot Gas Bypass Regulator Adjustment Liquid Drain Control MethodControl Settings for R-404A/R-507 Control SettingsControl Settings for R-22 Low Pressure Switch Setting for RmccWeekly General Maintenance ScheduleMonthly QuarterlyTemperature Symptom Cause Remedy CompressorDoes Not Run Unit ShortSwitch Open Symptom Cause Remedy LowHigh Suction Low SuctionSystem Reference Data Service Record