General Periodic Maintenance Checks; Standard Units - York YCAS0130 Installation, Operation & Maintenance Manual

Maintenance

GENERAL PERIODIC MAINTENANCE CHECKS

SERVICE SCHEDULE
Unit general:
Refrigerant systems general:
Compressors / Oil separator:
Evaporator
Air cooled condensers:
Power & Control system general:
Microprocessor controls:
198

STANDARD UNITS

MINOR SERVICE
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 economizer superheat.
Check liquid subcooling.
Check oil level.
Check oil pressure.
Check slide valve operation.
Check compressor heater.
Check condition of oil.
Check discharge superheat.
Check water fl ow.
Check water pressure drop.
Check heater.
Check for airfl ow obstructions.
Check fi ns.
Check fans and fan guards.
Check panel condition.
Check mains and control wiring.
Check sensor location.
Check mechanical HP cutouts.
Check emergency stop.
Check overload devices.
Check fault history.
Check program settings.
Check HP / LP cutout functions
Check pump-down function.
Check load / unload function.
FORM 201.19-NM1 (204)
MAJOR SERVICE
All items under Minor Service plus:
Check main structure.
Check paint-work.
Check solenoid valves.
Check water pH / glycol strength.
Brush fi ns. Clean with mild, low
pH cleaner.
Check fan motor bearings.
Check all connections.
Check compressor contactors.
Check fan contactors / overloads.
Check sensor / transducer calibration.
Check motor protectors.
Check fan control function.
Check ambient cut-out function.
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