Table of Contents
[5-2 Outdoor Unit Control ]
5-2-15
Refrigerant Circuits and Refrigerant Cycle Diagrams
Operation
Schematic diagram of refrigerant circuit
status
4-way valve
A
O
Cooling
M
only
Fan
High-pressure
liquid
Outdoor unit
A
O
B
Cooling
main
C
A
O
Heating
only
A
M
Heating
main
K
HWE1314A
Gas
Two-phase
Liquid
Check valve
Selector valve
M
L
Low-
pressure
Low-pressure two-phase
pipe
L
Low-pressure
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-
pressure
Cooling
Low-pressure two-phase
gas
N
L
M
Cooling
N
M
L
Heating
High-
F
H
pressure
G
gas
D
E
High-pressure
two-phase
I
High-pressure
J
K
liquid
L
Low-
pressure
High-pressure liquid
two- phase
L
L
L
M
High-
pressure
gas
F
High-pressure
liquid
Heating
J
B
D
C
Low-
pressure
Heating
High-pressure liquid
two- phase
B
C
D
Heating
B
C
D
Cooling
H
F
G
High-
pressure
gas
Low-
Low-pressure
gas
pressure
I
two- phase
High-pressure
E
liquid
Schematic diagram of refrigerating cycle
Pressure
L
Liquid
M
J G I
L
K H
M
M
M
L
M
M
F
C
F
E
D
G
I
- 149 -
Gas
Enthalpy
O
Gas-liquid mixture
(energy)
D C
F
E
B
N
O
O
H
K
J
M
A
A
A
B
A
GB
Chapters
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Troubleshooting
