To empty the refrigerant pipe from air and humidity, the use of the vacuum pump is recommended.
PIPING CONNECTION
5
ATTENTION: ONLY ACR
copper pipes for air conditioners are allowed
YES
NO
Connecting the pipes
Do not remove the cap from the pipe until connecting
it, to avoid dampness or dirt from entering.
If the pipe is bent or pulled too often, it will become
stiff. Do not bend the pipe more than three times at one
place.
When extending the rolled pipe, straighten the pipe by
unwinding it gently as shown in the figure below
To avoid leakage, pay particular attention to the following points:
Tighten the flare nuts using two wrenches. Pay attention not to damage the pipes.
If the tightening torque is not sufficient, there will probably be some leakage. With excessive tightening torque there will also be
some leakage, as the flange could be damaged.
The surest system consists in tightening the connection by using a fix wrench and a torque wrench: in this case use the following
table.
CONNECTIONS TO THE INDOOR UNIT
Shape the connection pipe following the diagram.
Remove the indoor unit pipe cap (check that there is no
debris inside).
Insert the flare nut and create a flange at the extreme
end of the connection pipe.
Connect the pipes by using two wrenches.
CONNECTIONS TO THE OUTDOOR
UNIT
Screw the flare nuts to the outdoor unit coupling with
the same tightening procedures described for the indoor
unit.
flare nuts
connection pipes
gas tap
liquid tap
indoor unit
FLANGE CONNECTION TIGHTENING TORQUE
Pipe
Tightening torque
Corresponding stress
[N x m]
(using a 20 cm wrench)
6,35 mm (
1
/
4
”)
15 - 20
wrist strength
9,52 mm (
3
/
8
”)
31 - 35
arm strength
12,70 mm (
1
/
2
”)
5
0
-
5
5
arm strength
15,88 mm (
5
/
8
”)
6
5 -
7
0
arm strength
TIGHTENING TORQUE FOR PROTECTION CAPS
Tightening torque
[N x m]
Service port nut
7 - 9
Protection caps
25 - 30
Service port nut
torque wrench
IMPORTANT ! REFRIGERANT LEAKAGE INSPECTION
After connecting the piping, check the joints for refrigerant leakage with leak detector carefully.
