Service manual

4-9
4.1.10 Check valve
● Model LCV(B)5
(1) Replacement procedure
q Remove the pipe clamp which fixes the
check valve, then heat up the valve to
disconnect the brazed joint.
w Install the new check valve taking care to
install it in the correct direction, which is the
same direction as the arrow shown in the
label.
e Conduct brazing while cool the center part of
valve with a wet cloth to keep the
temperature of the valve body below 120 ˚C
(248˚ F)
r After replacing the valve, carry out refrigerant
leakage check, and make sure that there are
no leaks.
Check valve
Discharge
pressure
regulating valve
Compressor
Suction
modulation
valve
4.1.11 High-pressure switch (HPS)
● Model ACB-KB15
● Set point OFF : 2400kPa (24.47kg/cm
2
)
ON : 1900kPa (19.37kg/cm
2
)
When the refrigeration pressure of the unit
rises abnormally, the compressor stops for
safety. The HPS will be activated when the
pressure exceeds the set point, as a result of
trouble with the condenser fan.
(1) Replacement procedure
q Disconnect the lead wire from the control
box.
w In order to prevent refrigerant from flowing
out, disconnect the high-pressure gauge
piping from the gauge joint (with check valve)
A on the compressor side.
e Remove the flare nut B and mounting
screws of HPS on the casing at the left side
of the compressor.
r Replace the HPS. After tightening the flare
nut B , tighten the flare nut A .
t After tightening A , slightly loosen the flare
nut B , remove air, and retighten B .
y After replacing carry out the refrigerant
leakage check, and make sure that there are
no leaks.
COMPRESSOR
LPT
L
S
P
H
T
P
H
Disconnect flare
nut here
Disconnect flare
nut here
B
A
C