33
5 Combined Refrigerant Piping System
Schematic Diagrams
5-1. Normal operation (COOL mode / DEFROST mode) -
high outside air temperature (roughly 68 °F (20 °C) or
above)
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
Pressure sensor
(high pressure)
Pressure sensor
(low pressure)
Accumulator
4-Way valve
Indoor unit
Note: In DEFROST mode, PMV4 also opens.
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". (The diagram shows a 168 type as an example.)