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SiUS30-1301
Refrigerant Flow for Each Operation Mode
Refrigerant Circuit
25
D. Heating and Simultaneous Cooling/Heating Operation (When the condensing unit water cooled heat exchanger
is used as evaporator.)
(In case there are indoor units operating with cooling thermostat “ON”.)
Filter
Filter
Heat exchanger
Filter
Filter
Heat exchanger
Filter
Filter
Heat exchanger
E
V
L
E
V
LS
E
V
HS
Filter
Filter
Filter
Filter
E
V
H
E
V
SC
E
V
L
E
V
LS
E
V
HS
Filter
Filter
Filter
Filter
E
V
H
E
V
SC
E
V
L
E
V
LS
E
V
HS
Filter
Filter
Filter
E
V
H
E
V
SC
Capillar
y t
ub
e
Do
ub
le pipe heat
exchanger
Capillar
y t
ub
e
Do
ub
le pipe heat
exchanger
Capillar
y t
ub
e
Do
ub
le pipe heat
exchanger
Condensin
g
Unit
To other condensing
u
nit
Solenoid
v
al
v
e
Heat exchanger pipe
Filter
Filter
Filter
Filter
F
u
si
b
le
pl
u
g
Electronic
expansion
v
al
v
e
Electronic
expansion
v
al
v
e
W
ater
inlet
W
ater
o
u
tlet
Solenoid
v
al
v
e
Solenoid
v
al
v
e
Solenoid
v
al
v
e
Capillary
t
ub
e
Capillary
t
ub
e
Capillary
t
ub
e
Plate heat
exchanger
Ser
v
ice
port
Fo
u
r-
w
ay
v
al
v
e
Fo
u
r-
w
ay
v
al
v
e
Check
v
al
v
e
Check
v
al
v
e
Check
v
al
v
e
Check
v
al
v
e
Strainer
Ga
u
ge port
S1
N
PH
S1
N
PL
S1PH
High press
u
re
sensor
High press
u
re
s
w
itch
Compressor
I
NV
.
Ga
u
ge port
1/4” flare connection
Lo
w
press
u
re
sensor
Capillary
t
ub
e
Filter
Filter
Filter
Solenoid
v
al
v
e
Press
u
re
reg
u
lating
v
al
v
e
S
ub
cooling
Heat e
xchanger
Recei
v
er
Oil
separ
ator
S
V
S
V
S
V
S
V
S
V
Branch Selector Unit
EXP
FA
N
O
N
FA
N
O
N
FA
N
O
N
(
N
ormal operation)
EXP
(
N
ormal operation)
EXP
(
N
ormal operation)
Indoor Unit O
N
(Cooling) + Thermo. O
N
Indoor Unit O
N
(Heating) + Thermo. O
N
Indoor Unit O
N
(Heating) + Thermo. O
N
High temp. High press
u
re gas
High temp. High press
u
re li
qu
id
Lo
w
temp. Lo
w
press
u
re gas
Lo
w
temp. Lo
w
press
u
re li
qu
id