28
a. Remove the indoor pipe flare nut. ( Check that there is no debris inside. )
b. Align the center of the flare surface, and tighten the indoor pipe union and
connection pipe flare nut with a torque wrench or double-ended wrench.
( Figure. 15 )
While aligning the center of the flare surface, tighten the nut by hand, hold the
union side with a wrench and tighten the nut according to the specified
tightening torque with a torque wrench.
Pay careful attention to the following points when installing the refrigerant pipes.
•
Hold the pipe with one wrench while tightening the connections with a torque
wrench or double-ended wrench.
Be careful not to damage the flare nut threads.
•
If the tightening torque is insufficient, gas will leak from the connection.
•
If it is too strong, the flare will be damaged.
Tighten the nut with the torque shown in Table 1.
•
Do not bend the pipe more than three times at one place.
•
When extending the rolled pipe, straighten the pipe by unwinding as shown
in Figure 14.
1) Connecting Pipe to the Indoor Unit
Figure 14
•
Repeat the procedure for flaring the tube to connect to the outdoor unit.
•
Tighten the flare nut of the connection pipe at the outdoor unit valve. ( Figure. 16 )
2) Connecting the Interconnecting Pipe to the Outdoor Unit Valve
Torque wrench or
double-ended wrench
Outdoor side
Indoor side
Figure 15
Table 1
6.35 mm (1/4”)
180
18
12.7 mm (1/2”)
560
55
15.88 mm (5/8”)
660
65
19.05 mm (3/4”)
1020
100
Flare nut
Tightening(kgf-cm)
Tourque(Nm)
CONNECTING THE PIPING
Figure 16
Interconnecting
pipework
(Gas pipe)
Three way valve
(Liquid pipe)
Two way valve