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Air Handlers
(4)
Check if the unit appearance and piping system has been damaged during
transportation or handling.
(5)
Check if the terminals are loose and the phases are correct.
5.2.2 Trial Run
(1)
Trial run can be operated by professional personnel only after above items have
been checked (items to be checked as per actual condition).
(2)
Power on the unit and press ON/OFF button to activate.
(3)
After compressor starting up, please immediately stop the unit when abnormal
sound emits.
(4)
Trial run under several modes and check if the unit operates normally.
6 Common Malfunction and Elimination
If the unit doesn't run normally, please check the following items before ask for
service.
Phenomenon
The unit can not be
activated.
The unit operates but
stops immediately.
Abnormal cooling or
heating.
Reason
The unit doesn't connect with
power supply.
Low voltage.
Fuse broken or breaker trips
off.
Air inlet/outlet of indoor unit is
blocked.
Air inlet/outlet of indoor unit is
blocked.
Inappropriate temperature
setting.
Doors or windows are
opened.
Direct sunshine.
Too much heat source in the
room.
Filter screen is blocked by
dirt.
23
Treatment
Connect with power
supply.
Check if circuit voltage
is within rated scope.
Replace fuse or
connect breaker.
Remove obstacles.
Remove obstacles.
Adjust setting at
thermostat.
Close the door or
windows.
Draw curtain or louver.
Reduce heat source.
Clean the filter.
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