Gas Leakage Inspection - Fujitsu SPLIT TYPE AIR CONDITIONER User Manual

When the flare nut is tightened properly by your hand,
use a torque wrench to finally tighten it.
Fig. 28
Tighten with two wrenches.
Wrench (fixed)
Flare nut
Torque
wrench
Indoor unit
Connection pipe
pipe
Table 4 Flare nut tightening torque
Pipe
Small pipe
Large pipe
Do not remove the cap from the connection pipe
before connecting the pipe.
Be sure to connect the large pipe after
connecting the small pipe completely.
(2) Outdoor unit side
Tighten the flare nut of the connection pipe at the
outdoor unit valve connector. The tightening
method is the same as that as at the indoor side.
Fig. 29
Connection pipe
(Large pipe)
3-way valve
To prevent gas leakage,
coat the flare surface with
refrigerator oil.
Tightening torque
22.42 to 25.32 ft. lbs
(310 to 350 kgf cm)
•
54.25 to 57.86 ft. lbs
(750 to 800 kgf cm)
•
(Small pipe)
Flare nut
Pipe coupling
2-way valve
4. CHECKING THE PIPE CONNECTIONS FOR
GAS LEAKING
For both the indoor and outdoor unit sides, check the
joints for gas leaking by the use of a gas leakage
detector without fail when the pipes are connected.
5. HEAT INSULATION ON THE PIPE JOINTS
(INDOOR SIDE ONLY)
Put coupler heat insulator on the joints (indoor side
only) (Fig. 30).
Fig. 30
Indoor unit
No gap
Coupler heat
insulation (large)
Large pipe
Coupler heat
insulation

5. GAS LEAKAGE INSPECTION

After connecting the piping, check the
joints for gas leakage with gas leak
detector.
9
Coupler heat
insulation
(small)
}
Be sure to overlap
the insulation
Small pipe
No gap