York YCAS0130 manual General Periodic Maintenance Checks Standard Units, 198

Maintenance

FORM 201.19-NM1 (204)

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 oil level.
	Check oil pressure.
	Check slide valve operation.
	Check compressor heater.
	Check condition of oil.
	Check discharge superheat.
Evaporator	Check water flow.	Check water pH / glycol strength.
	Check water pressure drop.
	Check heater.
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 cutouts.	Check sensor / transducer calibration.
	Check emergency stop.	Check motor protectors.
	Check overload devices.
Microprocessor controls:	Check fault history.	Check fan control function.
	Check program settings.	Check ambient cut-out function.
	Check HP / LP cutout functions
	Check pump-down function.
	Check load / unload function.

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