Fujitsu SPLIT TYPE AIR CONDITIONER

9
Fig. 28
Tighten with two wrenches.
Wrench (fixed)
Flare nut
Torque
wrench
When the flare nut is tightened properly by your hand,
use a torque wrench to finally tighten it.
Do not remove the cap from the connection pipe
before connecting the pipe.
(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.
Indoor unit
pipe
Connection pipe
To prevent gas leakage,
coat the flare surface with
refrigerator oil.
Fig. 29
Connection pipe
(Large pipe)
(Small pipe)
Flare nut
Pipe coupling
3-way valve
2-way valve
Pipe Tightening torque
Small pipe
22.42 to 25.32 ft. lbs
(310 to 350 kgf
•
cm)
Large pipe
54.25 to 57.86 ft. lbs
(750 to 800 kgf
•
cm)
Table 4 Flare nut tightening torque
Be sure to connect the large pipe after
connecting the small pipe completely.
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).
After connecting the piping, check the
joints for gas leakage with gas leak
detector.
5. GAS LEAKAGE INSPECTION
Fig. 30
Indoor unit
No gap
Coupler heat
insulation
(small)
Be sure to overlap
the insulation
Large pipe
Small pipe
Coupler heat
insulation (large)
Coupler heat
insulation
No gap
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