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Maintenance
GENERAL PERIODIC MAINTENANCE CHECKS
SERVICE SCHEDULE
Unit general:
Refrigerant systems general:
Compressors / Oil separator:
Cooler
Air cooled condensers:
Power & Control system general:
Microprocessor controls:
174
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 liquid subcooling.
Check oil level.
Check oil pressure.
Check unloader operation.
Check crankcase heater.
Check condition of oil.
Check water flow.
Check water pressure drop.
Check heater mats.
Check for airflow obstructions.
pH cleaner.
Check fins.
Check fans and fan guards.
Check panel condition.
Check mains and control wiring.
Check sensor location.
Check mechanical HP cutouts.
Check emergency stop.
Check residual current devices.
Check fault history.
Check program settings.
Check HP / LP cutout functions
Check pump-down function.
Check load / unload function.
MAJOR SERVICE
All items under Minor Service plus:
Check main structure.
Check paint-work.
Check solenoid valves.
None
Check water pH / glycol strength.
Brush fins. Clean with mild, low
Check fan motor bearings.
Check all connections.
Check compressor contactors.
Check fan contactors / overloads.
Check sensor / transducer calibration.
Check motor protectors.
Check contactor contacts.
Check fan control function.
Check ambient cut-out function.
Check low oil pressure function.
JOHNSON CONTROLS
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