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5-4. Emergency operation (cooling operation under
header outdoor unit backup scenario)
Header unit (MMY-MAP0964HT6UL)
Pressure sensor
(high pressure)
Follower unit (MMY-MAP0964HT6UL)
4-Way valve
Liquid tank
Accumulator
Balance pipe
Liquid pipe
Gas pipe
Liquid pipe
Liquid tank
Pressure sensor
(high pressure)
Accumulator
4-Way valve
Indoor unit
Pressure sensor
(low pressure)
High-pressure gas or condensate liquid refrigerant
Evaporative gas refrigerant (low-pressure gas)
Normal refrigerant line
Note: The "header unit" is the outdoor unit to which the indoor-outdoor communication line is connected.
All other outdoor units are called "follower units".
Leakage from PMV:
Liquid-side service valve
= Full closure
Set Up as Temporary Header
Unit during Emergency
Operation
Failure
Pressure sensor
(low pressure)
Gas-side service valve
= Full closure
Balance pipe packed
valve = Full opening
Refrigerant recovery line
(The diagram shows a 192 type as an example.)
Gas pipe
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