Refrigerant Circuits And Refrigerant Cycle Diagrams - Mitsubishi Electric PURY-HP72 Service Handbook

[5-2 Outdoor Unit Control ]
5-2-17

Refrigerant Circuits and Refrigerant Cycle Diagrams

Operation
Schematic diagram of refrigerant circuit
status
4-way valve
Check valve
A
pressure
O
Low-pressure
Cooling
M
only
Fan
High-pressure
liquid
Outdoor unit
A
pressure
O
B
Cooling
main
C
High-pressure
two-phase
A
two- phase
O
Heating
only
pressure
A
two- phase
M
Heating
main
K
pressure
HWE13080
Gas
Two-phase
Liquid
Selector valve
M L
Low-
Low-pressure two-phase
pipe
L
M
gas
M L
Heat exchanger
LEV
L
M
Gas-liquid
separator
Indoor unit
High-
pressure
pipe LEV
High-pressure
liquid
BC controller
Cooling
N
M L
Low-
Low-pressure two-phase
Cooling
gas
N
L
M
Cooling
N
M L
Heating
High-
F
G H
pressure
gas
D
E
I
High-pressure
J
K
liquid
L M
Low-
pressure
High-pressure liquid
M
L
L M
L M
High-
gas
F
High-pressure
liquid
Heating
J
B D
C
Low-
pressure
Heating High-pressure liquid
B C D
Heating
B D
C
Cooling
H F
G
High-
gas
Low-pressure Low-
gas pressure
I
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
- 136 -
Gas
A
Enthalpy
O
(energy)
D C F E B
A
N
O
A
O
B
A
K J H
M
GB