181
YORK INTERNATIONAL
FORM 201.18-NM4
GENERAL PERIODIC MAINTENANCE CHECKS
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 general:
Check relief valves.
Check solenoid valves.
Check fusible plugs.
Check for pipework damage.
Check for leaks.
Check moisture indicator.
Check suction superheat.
Check economizer superheat.
Check liquid subcooling.
Compressors / Oil separator:
Check liquid subcooling.
None
Check oil level.
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.
Check heater mats.
Air cooled condensers:
Check for airflow obstructions.
Brush fins. Clean with mild, low
pH cleaner.
Check fins.
Check fan motor bearings.
Check fans and fan guards.
Power & Control system general:
Check panel condition.
Check all connections.
Check mains and control wiring.
Check compressor contactors.
Check sensor location.
Check fan contactors / overloads.
Check mechanical HP cut-outs.
Check sensor / transducer calibration.
Check emergency stop.
Check motor protectors.
Check residual current devices.
Check contactor contacts.
Microprocessor controls:
Check fault history.
Check fan control function.
Check program settings.
Check ambient cut-out function.
Check HP / LP cutout function’s
Check low oil pressure function.
Check pump-down function.
Check load / unload function.
9
Summary of Contents for Millennium YCAS Series
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