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4-3. Normal Operation (HEAT Mode)
TL
PMV1
TD2
TS1
SV2
TE1
SV3D
PMV
TK2
SV3B
TK1
SV3A
HPS
HPS
HPS
TD1
TK4
SV3E
TK5
SV41
SV42
PMV4
TE2
TD3
SV43
TK3
SV6
TO
SV3F
SV3C
SV
SV
SV
SV
SV
SV
S
V
S
V
SV
SV
S
V
TL
PMV1
TD2
TS1
SV2
SV5
TE1
SV3D
PMV2
TK2
SV3B
TK1
SV3A
HPS
HPS
TD1
TK4
SV3E
TK5
2
4
V
S
1
4
V
S
A3
SV3C
TO
SV
SV
SV
SV
SV
SV
S
V
S
V
S
V
TC2
TC
J
TC1
TC2
TCJ
TC1
TC2
TCJ
TC1
TC
TCJ
TC1
PMV
PM
PMV
PMV
Header unit (MMY-MAP1604*)
Follower unit (MMY-MAP1204*)
FM
4-Way valve
Pressure sensor
(high pressure)
O.S.
Pressure sensor
(low pressure)
Accumulator
Compressor
1
Compressor
2
Compressor
3
Liquid tank
Balance pipe
Liquid pipe
Gas pipe
Liquid pipe
Gas pipe
Indoor unit
O.S.
Liquid tank
Accumulator
Compressor
1
Compressor
2
Pressure sensor
(low pressure)
Pressure sensor
(high pressure)
4-Way valve
FM
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 28 HP system
(16 HP + 12 HP) as an example.)