Screw angle standard
Screw torque standard
Screw angle
Pipe diameter
Copper pipe
diameter(mm)
PIPELINE INSTALLATION
(THE INDOOR UNIT)
9.52
35-40
60-90
15.88
73-78
30-60
19.05
98-130
20-35
INSTALLATION OF REFRIGERANT PIPE
Installation sequence
(1) Keep the original status of closing of gas valve and liquid valve of the outdoor unit.
Dismantle the nuts, anti-dust cap and piping screw plugs from the indoor and outdoor pipes
respectively, and connect horns of the pipes at the mean time (avoid dust, moisture, and other
things getting into the pipes.)
Smear a thin layer of seal oil on the matching surface of the horns and the connectors before
fixing the horn nuts.
When tightening the nuts, firstly push the horn onto the cone surface of the connector, and
keep the leading pipe and the connector in the same axis, then gradually turn the cone nuts
clockwise tightly with hands, and then tighten it with a wrench.
When tightening the nuts with wrench, apply torque according to the right list, if it is not
tightened enough, leakage of refrigeration agent may happen, but if it is too tight, the horn
surface may be damaged.
Screw torque
(N.m)
9.52
15.88
19.05
22
(2) Complete the horns connection in sequence, to finish connection of all the refrigeration
agent pipes.
The bending angle of the pipes should not be less than 90 degree, bending radius should not
be less than 100 mm, and bending times should not exceed 3 times.
After finishing connection of all pipes, use a tester of soap to check if there is leakage in the
pipes.
The connection part of the pipes should be covered with isolation sleeves, to avoid water
condensing at these positions, offsetting the isolation sleeves for gas and liquid pipes.
(3)Suction the air out from the maintenance opening of the pipe by a vacuum pump, to form
vacuum inside the pipes.
(4)After finishing the above operation, open both the gas valve to let the indoor and outdoor
pipes openly connected.
