- 63 -
2. Cooling only
(Note 1) The above figure is a refrigerant piping system diagram for inverter pump-integrated machine.
The piping system of pumpless models lacks of the pump and check valve seen in this diagram.
Outdoor air temperature
OAT
Inlet pump water pressure
PSW(S)
High pressure sensor
DGP*
High-pressure switch
63H*
Inlet water temperature
ET
Inlet water heat exchanger water pressure
PSW(E)
Low-pressure sensor
SGP*
Middle water temperature
MT
Outlet water heat exchanger water pressure
PSW(L)
Discharge gas temperature sensor
DGT*
Outlet water temperature
LT
Suction gas temperature sensor
SGT*
* indicates circuit name (A, B, C, D).
(*) Water drain valves for freeze prevention
Air heat exchanger
Air heat exchanger
Air heat exchanger
Ac
cu
m
u
la
to
r
Air heat exchanger
Electric
expansion valve
T
Circuit A
Circuit B
DGTA
Service
port
Service
port
Service
port
P
DGPA
P
SGPA
Service
port
SGTA
T
Solenoid valve
63HA
T
DGTB
P
DGPB
Ac
cu
m
u
la
to
r
P
SGPB
SGTB
T
63HB
T
OAT
Air heat exchanger
Air heat exchanger
Electric
expansion valve
Electric
expansion valve
Service
port
Air heat exchanger
Air heat exchanger
Service
port
T
DGTD
P
DGPD
A
ccu
m
u
la
to
r
P
SGPD
SGTD
T
63HD
A
ccu
m
u
la
to
r
T
DGTC
Service
port
P
DGPC
P
SGPC
SGTC
T
Solenoid valve
63HC
Water heat
exchanger
Water heat
exchanger
Circuit D
Circuit C
Air vent
valve
T
MT
Water
drainage port
(*)
Water
drainage port
(*)
T
P
LT
PSW(L)
Check
valve
Air vent
valve
T
P
ET
PSW(E
)
Pump
Strainer
Chilled
water
inlet
Chilled
water
outlet
Cooling
operation
Refrigerant piping system diagram
Service
port
Service
port
Service
port
Service
port
Service
port
Service
port
Co
m
p
re
s
so
r
Co
m
p
re
s
so
r
Solenoid valve
Co
m
p
re
s
so
r
Co
m
p
re
s
so
r
Solenoid valve
Electric
expansion valve
Electric
expansion valve
Electric
expansion valve
Check valve
Solenoid
valve
Solenoid
valve
Check valve
Electric
expansion valve
Electric
expansion valve
Electric
expansion valve
Electric
expansion valve
Check valve
Solenoid
valve
Electric
expansion valve
Check valve
Solenoid
valve
Electric
expansion valve
P
PSW(S)