Toshiba MMU-AP0091MH, MMU-AP0181MH, MMU-AP0151MH, MMU-AP0071MH, MMU-AP0121MH Information

3-8. Information

Confirmation before operation

•Turn on the power switch 12 hours before starting the operation.

•Make sure whether earth wire is connected.

•Make sure the air filter is connected to the indoor unit.

Heating capacity

•A heat pump system which absorbs heat from outside of the room and then discharges heat into the room is adopted for heating. If the outside temperature falls, the heating capacity decreases.

•When the outside temperature is too low, it is recommended to use this air conditioner together with other heating equipment.

Defrost during heating operation

•In heating operation, if there is frost on the outdoor unit, the operation changes automatically to the defrost operation (Approx. 2 to 10 minutes) to increase the heating efficiency.

•During defrost operation, the fan of the indoor unit stops.

3-minutes protection

•When restarting the operation just after the operation has been stopped or the main power switch has turned on, the outdoor unit does not work for approx. 3 minutes in order to protect the air conditioner.

Power failure

•If a power failure occurred during operation, all operations stop.

•When the power is returned after a power failure, the operation lamp notifies the power-ON by flashing operation lamp on the remote controller.

Protective device (High pressure switch)

This device stops automatically an operation when excessive force is applied on the air conditioner.

If the protective device works, the operation stops and the operation lamp flashes.

When the protective device works, the indication TEST and the check code are displayed on the display section of the remote controller. In the following cases, the protective device may work.

In cooling operation

•The suction port or discharge port of the outdoor unit is closed.

•A strong wind continuously blows to the discharge port of the outdoor unit.

In heating operation

•Dust or waste adheres excessively to air filter of the indoor unit.

•The discharge port of the indoor unit is closed.

If the protective device works, turn off the main power switch, solve the cause, and then start the operation again.

Cooling/Heating operation of Super Modular Multi system air conditioner

•	Although each indoor unit can be individually
	controlled in the Super Modular Multi system air
	conditioner, the cooling operation and the heating
	operation cannot be simultaneously performed in
	the multiple indoor units which are connected to
	an outdoor unit.
•	If the cooling operation and the heating operation
	are simultaneously performed, the indoor unit
	which executes cooling operation stops, and	on

• When restarting the operation, push button again.

Fan rotation in stopped unit

ON / OFF

the operation section lights up. On the other hand,

the indoor unit which executes heating operation

continues running. In a case that the manager of

the air conditioner has fixed the operation to

cooling or heating, an operation other than that set

•In heating operation even in the stopped indoor unit, the fan rotates once for several minutes per approx. an hour when the other indoor unit is operating to protect the air conditioner.

up is unavailable. If an operation other than that
set up is executed,	on the operation section
lights up and the operation stops.

Characteristics of heating operation

•The wind is not out just after starting an operation. The hot wind starts to blow 3 to 5 minutes after (Time differs according to indoor/outdoor tempera- ture.) the indoor heat exchanger has warmed up.

•During operation, the outdoor unit may stop if the outside temperature rises.

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