Toshiba MMY-MAP0724HT6UL - Refrigerant Recovery from Failed Outdoor Unit; Backup Scenario)

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5-6. Refrigerant recovery from failed outdoor unit (pump-
down operation under follower outdoor unit backup
scenario)
Header unit (MMY-MAP0964HT6UL)
Pressure sensor
(high pressure)
Follower unit (MMY-MAP0724HT6UL)
4-Way valve
Liquid tank
Accumulator
Balance pipe
Liquid pipe
Gas pipe
Liquid pipe
Liquid
tank
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".
Failure
Pressure sensor
(low pressure)
Gas-side service valve = Full opening
⇒ Full closure 10 minutes after system startup
Balance pipe packed valve
= Full opening
(The diagram shows a 168 type as an example.)
Liquid-side service valve
= Full closure
Gas pipe
Refrigerant recovery line
Liquid line bypass
Pressure sensor
(high pressure)