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4-3. Refrigerant Flow (Heating)
Header Unit (MMY-MUP1201*, MUP1441*，MUP1681*，MUP096H1* ，MUP120H1*)
M
FAN motor
PMV1
Left side
Main heat exchanger
TL1
TE1
Left side
PMV2
Sub heat exchanger
TE2
Hot gas heat exchanger
TL2
PMV3
High-pressure
sensor
仮
TS3
SV
SV41
Subcool
Heat Exchanger
PMV4
TL3
Liquid side
Gas side
Service valve
Service valve
TC2
TCJ
TC1
Heating
Outdoor Unit
4-way valve
ON
SV3D
Control
PMV1
Control
SV3F
Control
PMV2
Control
SV4(n)
Control
PMV3
Control
SV5B
Control
PMV4
Control
Outdoor fan
Control
FAN
FAN
M
FAN motor
TO
Right side
Main heat exchanger
TG1
TG2
Right side
Sub heat exchanger
TG3
TE3
Hot gas heat exchanger
SV5B
SV
Accumulator
SV
SV3D
Highpressure
switch
SV3F
TD1
TK1
TC2 TCJ
Heating
The outdoor unit which communication line between indoor and outdoor is connected is the "Header unit".
Other outdoor units are called "Follower units".
Follower Unit (MMY-MUP0721*, MUP0961*, MUP0721H1*)
PMV1
TL1
TL2
4-way valve
TS1
Low-pressure
sensor
Fusible
plug
FP
Subcool
Heat Exchanger
PMV4
TL3
TC1
TC2 TCJ
High-pressure gas refrigerant
Condensed liquid refrigerant
(18 ton system described in the example of (12 ton + 6 ton)
- 46 -
M
FAN motor
Main heat exchanger
TE1
Sub heat exchanger
PMV2
TE2
Hot gas heat exchanger
High-pressure
sensor
TS3
SV
SV3D
SV
SV41
Highpressure
switch
TD1
TK1
TC1
Heating
Evaporative gas refrigerant (Low pressure)
Low-pressure circuit (Refrigerant recovery line)
FAN
TO
TG1
TG2
SV
SV5B
4-way valve
TS1
Low-pressure
sensor
Fusible
plug
Accumulator
FP
SV3F
TC2 TCJ
TC1
Heating
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Troubleshooting
