4-2. Refrigerant Flow (Single Defrost)
Outdoor Unit (MMY-MUP2401*)
M
Fan
M
Fan
Left side
Main heat exchanger
Right side
Main heat exchanger
Left side
Main heat exchanger
Right side
Main heat exchanger
Right side
Sub heat exchanger
Right side
Sub heat exchanger
Left side
Sub heat exchanger
Left side
Sub heat exchanger
Fan motor Fan motor
TE1 TG1
TG2
TE2 TE3
PMV2
TL1
Inverter heat sink
Subcool
Heat Exchanger
High-
pressure
switch
High-
pressure
switch
High-pressure
sensor
4-way valve
Low-pressure
sensor
Accumulator
TS1
TL2
PMV1
TG3
TS3
SV3D
SV41
TD1 TD2
TL3
Liquid side
Service valve
TC2 TCJ TC1
Cooling
Outdoor Unit
High-pressure gas refrigerant
Condensate liquid refrigerant
Evaporative gas refrigerant (Low pressure)
Low-pressure circuit (Refrigerant recover line)
TK1 TK2
PMV3
PMV4
Oil separator
Compressor 1
(Inverter)
Compressor 2
(Inverter)
SV
SV42
SV3F
SV SV
SV
Gas side
Service valve
TC2 TCJ TC1
Cooling
TO
4-way valve
PMV1
PMV2
PMV3
PMV4
OFF
Control
Control
Control
Control
SV3D
SV3F
SV4(n)
Outdoor fan
Control
Control
Control
Control
The outdoor unit which communication line between indoor and outdoor is connected is the "Header unit".
Other outdoor units are called “Follower units”.
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