York YCAS0098EB, Installation Operation & Maintenance, Page: 174 / 184

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JOHNSON CONTROLS
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 cutouts. 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 functions Check low oil pressure function.
Check pump-down function.
Check load / unload function.
Maintenance