York YS Service Manual download pdf (Page 44)

7.3 Regular Maintenance Operations

Service Schedule MINOR SERVICE

( 3 - 6 monthly ) *

MAJOR SERVICE ( 6 - 12 monthly ) *

All items under Minor Service plus:

General Check thermal insulation

Check vibration isolators

Check main structure

Check paint-work

Check vibration levels

Refrigerant Systems Check relief valves

Check for pipework damage

Check for leaks

Check operating temps./press.

Check suction superheat

Check liquid subcooling

Pressure test complete system

Check chemical condition of system

Oil System Check oil level

Check oil pressure

Check oil differential pressure

Change oil filter element

Check eductor nozzles

Change oil return strainers

Check oil heater

Check chemical condition of oil

Change oil

Check solenoid valves

Compressor Check unloader operation Check drive coupling

Check compressor / motor alignment

Drive Motor Check mounting bolts Clean air passages

Clean windings

Megger test

Lubricate bearings

Evaporator & Condenser Clean water strainers

Check tubes

Check end sheets

Mechanically brush condenser tubes.

Verify evaporator and condenser water

flow rates against design conditions.

Power & Control System Check panel condition

Check mains and control wiring

Check sensors

Check mechanical HP cut-outs

Check emergency stop

Check 3-phase voltage and current

balance

Check all connections

Check compressor contactors / SSS

Check sensor / transducer calibration

Check motor protectors

Microcomputer Check fault history

Check program settings

Check HP / LP cut-out functions

Check load / unload function

Check ambient cut-out function

Check low oil pressure function

* Service interval depends on operational requirements - please contact York for individual site recommendations .

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York YS Service Manual Page 44

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