
39
9. Piping Diagram
Cooling System
• 18HP with indoor units
High Temperature & Pressure Gas
High Temperature & Pressure L
iq
uid
Low Temperature & Pressure Gas
Low Temperature & Pressure L
iquid
COOL FAN ON
COOL FAN ON
COOL FAN ON
OFF
FAN OFF
COOL FAN ON
OFF
FAN OFF
Outdoor Fan Motor 1
(OFM1)
Outdoor Fan Motor 2
(OFM2
)
Hea
t E
xc
ha
nger -
In
ter
co
oler
(H
X_IC
)
Ther
m
isto
r -
EVI I
n (
T_
EI
)
Ther
m
isto
r -
Liqui
d pipe
(T
_L
)
Electronic Expansion Valve - EVI (E_EVI)
Ther
m
isto
r -
EVI O
ut
(T
_EO
)
So
len
oid
Valve -
EVI By
pa
ss
(V_EB)
Bal
l V
al
ve -
Liqui
d pipe
(BV
_L
)
So
len
oid
Valve -
Ac
cumu
lator o
il R
eturn
(V_
AR
)
So
le
no
id V
alve -
Ho
t G
as
by
pa
ss
(V
_H
G)
So
len
oid
Valve - EVI (V_EVI)
Com
pres
sor
(COMP)
Thermistor - Disc
harge pipe
(T_D)
Sole
noid Va
lve -
4W
ay
(V
_4
W
)
Thermistor - Suc
tion pipe (T_S)
Thermistor - Ambient
(T_A)
Thermistor - Cond Out
(T_CO)
Electronic Expansion Valve - Main (E_M)
Check Valve - EEV By
pass
(CV_EB)
Heat Exchanger - Main (H
X_M)
Oil Separator
(OS)
Thermistor - Compressor
Top (T_CT)
Check Valve - Disc
harge
(CV_D)
Pressur
e
Switch - High (PW_H)
IP
M Cooler
(IP
MC
)
Pr
es
su
re
Se
ns
or
-
Hi
gh
(P
S_H
)
Pressure Sensor -
Low (PS_L)
Ball Valve -
Gas pipe (BV_G)
Accumulator
(AC)