Toshiba MMU-AP0091H service manual Test operation, 100

2. Test operation

START

Test operation for one indoor unit

YES

Operation start

YES

Is cold air or hot air discharged?

YES

Is air circulation good?

YES

Test operation for all units in turn

Operate all the indoor units at once.

(NOTE 1)

Is the temperature difference

between suction and discharge good?

YES

Is the operating voltage correct?

(Rated voltage ±10%)

YES

(NOTE 2)

Is the operating current normal?

YES

(NOTE 3)

Is the operating pressure normal?

YES

Normal

Refer to “Test operation procedure” of indoor remote controller.

NO	The operation does not start approx. 3 minutes
	after power-ON or after operation stopped.

(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
NO	• Check power voltage of the
	main power supply.
	• Check cable size of the
	power supply.

NO • Check temperature load of the indoor room/ outdoor ambient.

•Check pipe length and refrigerant charge amount.

•Check operating Hz of compressor.

NO	• Check abnormal sound in the outdoor unit.
	(Abnormal sound, etc of compressor and others)

100