Toshiba MMU-AP0091H Installation Manual page 138

2. Test operation
Execute a test operation for an indoor unit.
The operation starts.
Is cold air or hot air discharged?
Is air circulation good?
Execute test operation
for each unit successively.
Operate all the indoor units simultaneously.
(NOTE 1)
Is the temperature difference
between suction and discharge good?
Is the operating voltage correct?
(NOTE 2)
Is the operating current normal?
(NOTE 3)
Is the operating pressure normal?
START
YES
YES
YES
YES
Normal
Refer to "Test operation procedure" of
indoor remote controller.
The operation does not start approx. 3 minutes
after power-ON or operation stop.
(NOTE)
After power-ON, it may require Max. 10 minutes
to start the operation due to the initial
communication of the system.
Check operation status of the compressor.
Check direction of the louver.
Execute a test operation using
"Function of start/stop the indoor unit from
outdoor unit" in "Service support function".
NO
• Check power voltage of the
NO
main power supply.
• Check cable diameter of the
power supply.
NO
• Check temperature load in indoor/outdoor.
• Check cable length and refrigerant amount.
• Check operating Hz of compressor.
• Check abnormal sound in outdoor unit.
NO
(Abnormal sound, etc of compressor and others)
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