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FORM 150.68-ICOM1
ISSUE DATE: 10/15/2020
SCHEDULED MAINTENANCE
The maintenance operations detailed in the following table should be performed on a regular basis by a suitably
qualified Service Engineer. It should be noted that the interval necessary between each 'minor' and 'major' service
can vary depending on, for instance, application, site conditions and expected operating schedule. Normally a 'minor'
service should be carried out every three to six months and a 'major' service once a year. It is recommended that
your local Johnson Controls Service Center is contacted for recommendations for individual sites.
SERVICE SCHEDULE
Unit general:
Refrigerant systems general:
Compressors:
Heat Exchanger:
Ambients coils:
Power & Control system general:
Microprocessor controls:
HEAT EXCHANGER IN-SERVICE INSPECTION
There is no corrosion on the refrigerant side therefore in-service inspection on the refrigerant side is not necessary.
For the water side, if the water used is treated in accordance with Section 4, in-service inspection is not necessary.
In the design of the vessels used in the unit, a 1 mm corrosion allowance has been used to consider slight corrosion
on the water side. This allowance is sufficient to cover the lifetime of the unit.
Johnson Controls believes that periodic in service proof testing (e.g.; hydro tests) is not required. However, Johnson
Controls recognizes that national regulations may require such testing to be conducted.
68
MINOR SERVICE
Check thermal insulation.
Check vibration isolators.
Check relief valves.
Check for pipework damage.
Check for leaks.
Check moisture indicator.
Check suction superheat.
Check liquid subcooling.
Check oil level.
Check condition of oil.
Check water flow.
Check water pressure drop.
Check heater mats.
Check for airflow obstructions.
Check fins.
Check fans and fan guards.
Check panel condition.
Check mains and control wiring.
Check sensor locations.
Check mechanical HP cut-outs.
Check fault history.
Check program settings.
Check HP / LP cut-out function's.
Check load / unload function.
MAJOR SERVICE
All items under Minor Service plus:
Check main structure.
Check paint-work.
Check solenoid valves.
Check water pH / glycol strength.
Brush fins.
Check fan motor bearings.
Check all connections.
Check compressor contactors.
Check fan contactors
Check sensor / transducer calibration.
Check motor protectors.
Check contactor contacts.
Check fan control function.
Check ambient cut-out function.
JOHNSON CONTROLS
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