Standard Units - York YCRS Series Installation, Operation And Maintenance Manual

TABLE 7 – STANDARD UNITS
SERVICE SCHEDULE
Unit general:
Refrigerant systems
general:
Compressors /
Oil separator:
Cooler:
Condenser:
Power & Control
system general:
Microprocessor
controls:
YORK INTERNATIONAL

STANDARD UNITS

MINOR SERVICE
All items under Minor Service plus:
Check thermal insulation.
Check vibration isolators.
Check relief valves.
Check fusible plugs.
Check for pipework damage.
Check for leaks.
Check moisture indicator.
Check suction superheat.
Check liquid subcooling.
Check oil level.
Check oil pressure.
Check unloader operation.
Check crankcase heater.
Check condition of oil.
Check water flow.
Check water pressure drop.
Check water flow.
Check water pressure drop.
Check panel condition.
Check mains and control wiring.
Check sensor locations.
Check mechanical HP cutouts.
Check emergency stop.
Check fault history.
Check program settings.
Check HP / LP cutout functions.
Check pump-down function.
Check load / unload function.
MAJOR SERVICE
Check main structure.
Check paint-work.
Check solenoid valves.
Check water pH / glycol strength.
Check water pH / glycol strength.
Check all connections.
Check compressor contactors.
Check sensor / transducer calibration.
Check motor protectors.
Check contactor contacts.
Check low and high ambient cutout functions.
Check low LCHLT cutout function.
Check low differential oil pressure function.
Check low evaporator temperature cutout function.
FORM 201.25-NM1 (302)
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