4. Preparation of Pipe
●
Use a pipe cutter to cut the copper pipe.
●
Before
fl
aring, please put on the
fl
are nut.
Outer
Diameter (Ø)
6.35 (1/4”)
9.52 (3/8”)
12.7 (1/2”)
Imperial
fl
aring tool
0
~
0.5mm
0
~
0.5mm
0
~
0.5mm
Rigid
fl
aring tool
A (mm)
●
Please use exclusive tool
1.0mm
1.0mm
1.0mm
Outer diameter of pipe (Ø)
Torque N·m (kgf · cm)
Small diameter side
●
Please be careful when bending the copper pipe.
●
Screw in manually while adjusting the center. After that, use of torque wrench to tighten the connection.
Large diameter side
6.35 (1/4”)
13.7-18.6 (140-190)
9.52 (3/8”)
34.3-44.1 (350-450)
12.7 (1/2”)
44.1-53.9 (450-550)
Small diameter side
Large diameter side
6.35 (1/4”)
19.6-24.5 (200-250)
9.52 (3/8”)
19.6-24.5 (200-250)
12.7 (1/2”)
29.4-34.3 (300-350)
Valve head
cap
12.3-15.7 (125-160)
Valve core cap
CAUTION
!
●
In case of removing
fl
are nut of a indoor unit,
fi
rst remove a nut of small diameter side, or seal
cap of large diameter side will
fl
y out. Free from water into the piping when working.
●
During connection, keep away from water.
●
Be sure to tighten the
fl
are nut to the speci
fi
ed torque using a torque wrench. If the
fl
are nut is
tightened excessively, it may crack as time elapses, causing refrigerant leakage.
●
Install the unit in a stable place to minimize vibration or noise.
●
After arranging the cords and pipes, secure them in place.
Gas leakage inspection
Please use gas leakage detector to check if leakage occurs
at connection of
fl
are nut as shown on the right.
If gas leakage occurs, further tighten the connection to stop leakage.
(Use the detector provided for R410A)
Tighten all the way by hand.
Do not tighten all at once, but tighten it while
fi
tting the
fl
ared surface to the pipe.
5. Pipe Connection
5.1 Pipe connection
Connecting the pipe to outdoor unit
(1) Remove the
fl
are nut and seal cap from the service valve.
(2) Apply refrigerator oil to the service valve and the
fl
ared
portion of the pipe.
(3) Using a wrench, security tighten.
●
Jagged edge will cause leakage.
●
Point the side to be trimmed downwards during trimming
to prevent copper chips from entering the pipe.
7. Operation test
●
Please ensure that the air conditioner is in normal operating condition during the operation test.
●
Explain to your customer the proper operation procedures as described in the user’s manual.
●
If the indoor unit does not operate, check to see that the connections are correct.
CAUTION
●
Trial run should be conducted on one unit at a time to check for incorrect wiring of connecting cord.
!
6. Removal Of Air From The Pipe And Gas Leakage Inspection
6.1 Air purging by using vacuum pump
Fig. 6-1
Fig. 6-2
Fig. 6-3
CAUTION
!
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INS RAM-68NP3B 2
INS RAM-68NP3B 2
3/24/16 5:12 PM
3/24/16 5:12 PM
