Hitachi RAM-110NP6B [2/2] Caution
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Hitachi RAM-110NP6B [2/2] Caution

Hitachi RAM-110NP6B [2/2] Caution
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 specifi 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.
CAUTION
!
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
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INS RAM-110NP6B (EN) 2INS RAM-110NP6B (EN) 2 8/6/15 4:43 PM8/6/15 4:43 PM

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