Mitsubishi Electric PQHY-P72ZLMU-A Service Handbook page 167

[ VII Control ]
-15- Cooling/heating Circuit Control and General Function of System Equipment
Operation
Schematic diagram of refrigerant circuit
status
4-way valve
Check valve
A
pressure
O
Low-pressure
Cooling
only
Gas-liquid
separator
High-pressure
pressure
liquid
Heat source unit
A
pressure
O
B
Cooling
main
pressure
C
High-pressure
two-phase
A
pressure
two- phase
O
Heating
only
pressure
A
pressure
two- phase
M
Heating
main
K
pressure
HWE15150
Gas
Two-phase
Liquid
Selector valve
M L
Low-
Low-pressure two-phase
pipe
L
M
gas
M L
Heat exchanger
LEV
L
M
Indoor unit
High-
pipe
LEV
High-pressure
liquid
BC controller
Cooling
N
M L
Low-
Cooling Low-pressure two-phase
gas
N
L
M
Cooling
N
M L
Heating
High-
F
G H
gas
D
E
I
High-pressure
J
K
liquid
L M
Low-
High-pressure liquid
L M
L M
L M
High-
gas
F
High-pressure
liquid
Heating
J
B D
C
Low-
Heating High-pressure liquid
B C D
Heating
B D
C
Cooling
H F
G
High-
gas
Low-pressure Low-
pressure
I gas
two- phase
High-pressure
E
liquid
Schematic diagram of refrigerating cycle
Pressure
L
Liquid
M
Gas-liquid mixture
J G I
L
K H
M
L
M
F
C
E F
D
G
I
- 158 -
Gas
A
Enthalpy
O
(energy)
D C F E B
A
N
O
A
O
B
A
H
K J
M
GB