FORM 201.25-NM1 (302)
77
YORK INTERNATIONAL
STANDARD UNITS
SERVICE SCHEDULE
MINOR SERVICE
MAJOR SERVICE
All items under Minor Service plus:
Unit general:
Check thermal insulation.
Check main structure.
Check vibration isolators.
Check paint-work.
Refrigerant systems
Check relief valves.
Check solenoid valves.
general:
Check fusible plugs.
Check for pipework damage.
Check for leaks.
Check moisture indicator.
Check suction superheat.
Check liquid subcooling.
Compressors /
Check oil level.
Oil separator:
Check oil pressure.
Check unloader operation.
Check crankcase heater.
Check condition of oil.
Cooler:
Check water flow.
Check water pH / glycol strength.
Check water pressure drop.
Condenser:
Check water flow.
Check water pH / glycol strength.
Check water pressure drop.
Power & Control
Check panel condition.
Check all connections.
system general:
Check mains and control wiring.
Check compressor contactors.
Check sensor locations.
Check sensor / transducer calibration.
Check mechanical HP cutouts.
Check motor protectors.
Check emergency stop.
Check contactor contacts.
Microprocessor
Check fault history.
Check low and high ambient cutout functions.
controls:
Check program settings.
Check low LCHLT cutout function.
Check HP / LP cutout functions.
Check low differential oil pressure function.
Check pump-down function.
Check low evaporator temperature cutout function.
Check load / unload function.
TABLE 7 –
STANDARD UNITS
8
