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(2) Test operation
Test operation for one indoor unit
Is cold air or hot air discharged?
Operate all the indoor units at once.
Note 1
Is there adequate temperature difference
between suction and discharge?
Is the operating voltage correct?
Note 2
Is the operating current normal?
Note 3
Is the operating pressure normal?
START
Operation starts
YES
Is air circulation sufficient?
YES
YES
(220 V ±10%)
YES
YES
YES
Normal
Notes 1-3 are after the next page.
Refer to "Test operation procedure"
of the indoor remote controller.
The operation does not start for
approximately 3 minutes after
powering-on or stopping operation.
Note: After powering-on, it may
require up to 10 minutes to start
the operation due to the initial
communications of the system.
NO
Check the operating status of the
compressor.
NO
Check the direction of the louver.
Execute a test operation using
"Start/Stop Function of the Indoor
Unit from Outdoor Unit" in the
"Service Support Function" section.
NO
• Check power voltage of
NO
the main power supply.
• Check the cable size of
the power supply.
NO
• Check the temperature load of the
indoor/outdoor units.
• Check the pipe length and refrigerant
amount.
• Check the operating Hz of the
NO
compressor.
• Check the operation of the outdoor
fans.
• Check for abnormal sound in the
outdoor unit.
(Abnormal sound, etc. of the
compressor and other components)
- 143 -
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Troubleshooting
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