Toshiba MMU-AP0091H service manual Operation mode Outline

1. OUTLINE

“Super Heat Recovery Multi System” is a multi air conditioning system which enables each indoor unit in a refrigerant line to independently select cooling or heating operation.

As it is able to operate simultaneously in cooling and heating modes, further heat recovery becomes possible. This system is most suitable for a building etc. where cool and hot air are mixed, such as a building where there are large temperature differences between rooms, caused by the influence of daylight or where used in a server room and permanent cooling is required.

Heating and cooling operation are automatically selected in individual unit;

You can save time for operation.

For example, when heating is required for early morning and cooling for daytime, a Flow Selector Unit provides automatically a smooth selection of heating or cooling operation.

Therefore you can obtain a comfortable room environment without feeling somewhat out of place and moreover you can save time to select heat/cool operation.

INFORMATION

The Super Heat Recovery Multi system is different from that of the conventional Multi air conditioner in several ways such as the heating and cooling operations are mixed and only a part of the air conditioning system operates in cooling function.

For this reason, the following table explains the operation modes of this air conditioner.

The following table explains the representation of the operation modes within this Manual.

Operation mode

	Operation mode	Outline
1.	All Cooling	All indoor units are under cooling operation only.
		Outdoor heat exchanger (Main heat exchanger) is used as condenser.
2.	All Heating	All indoor units are under heating operation only.
		Outdoor heat exchanger (Main heat exchanger) is used as evaporator.
3.	Simultaneous operation	MIU for simultaneous operation
	3-1. Mainly cooling, partly	Indoor units are under heating/cooling simultaneous operation with subjective cooling operation
	heating operation	Outdoor heat exchanger (Sub heat exchanger) is used as condenser.
	3-2. Mainly heating, partly	Indoor units are under heating/cooling simultaneous operation with subjective heating operation
	cooling operation	Outdoor heat exchanger (Main heat exchanger) is used as evaporator.
4.	Defrost	Using the reversing operation of the 4-way valve, ice on the outdoor heat exchanger is dissolved
		within single cooling cycle.

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