Cooling/Heating Mode Switching - Daikin VRV EMERION REYQ-AATJA Service Manual

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Special Control

Cooling/Heating Mode Switching

While in cooling/heating mixed mode, single-room cooling → heating

First, the electronic expansion valve of the indoor unit in cooling operation will close, and the Y2E

and Y3E electronic expansion valves of the branch selector unit will all close once.

Next, the Y2E electronic expansion valve will open little by little to perform pressure equalization.

Then the electronic expansion valve will fully open, and the electronic expansion valve of the indoor

unit will open to activate the heating circuit.

The required switching time is approximately 6 minutes. (Field settings, however, can shorten the

time from 6 minutes to 4 minutes.)

(1) In cooling operation

(2) In equalization

(3) To heating mode

Cooling Unit

Heating Unit

Branch Selector unit

Dual pressure gas pipe

Suction gas pipe

Branch Selector unit

Dual pressure gas pipe

Suction gas pipe

Branch Selector unit

Dual pressure gas pipe

Suction gas pipe

SiUS372201EB

Part 4 Functions and Control

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