Service manual

c) The pipe bend shall not be too small; otherwise the pipe might break. Please use pipe bender
to bend the pipe.
d) Use sponge to wrap up the connecting pipe and connector without heat insulations, and fasten
with plastic tape.
2) Vacuumizing and Leakage Detection
a) Remove the cap from liquid valve and gas valve.
b) Align the pipe center and tighten the connecting pipe nut securely with your hand.
c) Tighten the nut with a wrench.
d) Remove the 1-way valve cap on the gas valve.
e) Use inner hexagonal wrench to loosen the core of liquid valve for 1/4 turn, and use a
screwdriver to pop up the core of gas valve to discharge the gas.
f) The discharge will last 15 seconds until refrigerant gas flows out. Immediately close the 1-way
valve and tighten the cap.
g) Open the core of liquid valve and gas valve to full (See Fig.11-20).
h) Tighten the valve cap. Then, use soap water or leakage detector to check if there is leakage at
the connection to indoor and outdoor unit.
i) If permitted, it is best to use a vacuum pump to expel the air out of unit from the valve. See
Fig.11-20.
压力计
压力计
"LO"旋钮
"HI"旋钮
连接软管
液阀
气阀
真空泵
Fig.11-20
3) Installation of Protection Layer on Connecting Pipe
a) To avoid condensing or water leakage, the small and big connecting pipes must be wrapped
with heat insulation materials and adhesive tape to isolate from the air.
b) The connector of indoor unit shall be wrapped with heat insulations properly, without any
clearance to the wall surface on which the indoor unit is mounted. See Fig.11-21.
LO Knob
Pressure gauge
Pressure gauge
Vacuum pump
Li
q
uid valve
HI Knob
A
ir valve
Connection hose
102