Carrier 38GJ Owner's Manual & Installation Instructions page 21

8 Maintenance
A regular inspection, maintenance and care should be performed by professional personnel, which will prolong the unit's
life span.
8.1 Outdoor heat exchanger
The outdoor heat exchanger should be cleaned once every two months. Use a vacuum cleaner with a nylon brush
to clean up dust and small particles on the surface of the heat exchanger. Blow away dust with compressed air, if available.
Never use water to wash the heat exchanger.
8.2 Drain Pipe
Regularly check if the drain pipe is clogged to drain condensate smoothly.
8.3 Notice before Seasonal Use
(1) Check if the inlet/outlet of the indoor/outdoor unit is clogged.
(2) Check if the ground wire is earthed reliably.
(3) Check if the battery of remote wireless controller has been replaced.
(4) Check if the filter screen has been set correctly.
(5) After a long period ofnonuse, open the main power switch 8 hours before re-operating the unit to
preheat the compressor crankc ase.
(6) Check if the outdoor unit is installed securely. If there is anything abnormal, contact the
appointed service center.
8.4 Maintenance after Seasonal Use
(1) Cut off the main power supply to the unit.
(2) Clean the filter screen and the indoor and outdoor units.
(3) Clean the dust and small particles on the indoor and outdoor units.
(4) In the event of rusting, use anti-rust paint to stop t h e spreading of rust.
8.5 Parts Replacement
Purchase parts from an appointed service center or dealer if necessary.
NOTICE!
During the airtight and leakage test, never mix oxygen, ethyne and other dangerous gas into the refrigeration
circuit. In case of hazard, it is better to use nitrogen or refrigerant to perform the test.
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