12
English
Refrigerant Piping Work
1.
Flaring the pipe end
1) Cut the pipe end with a pipe cutter.
2) Remove burrs with the cut surface facing
downward so that the chips do not enter the pipe.
3) Put the flare nut on the pipe.
4) Flare the pipe.
5) Check that the flaring is properly made.
WARNING
• Do not use mineral oil on flared part.
• Prevent mineral oil from getting into the system as this would reduce the lifetime of the units.
• Never use piping which has been used for previous installations. Only use parts which are delivered with the unit.
• Never install a dryer to this R32 unit in order to guarantee its lifetime.
• The drying material may dissolve and damage the system.
• Incomplete flaring may cause refrigerant gas leakage.
2.
Refrigerant piping
CAUTION
• Use the flare nut fixed to the main unit. (To prevent cracking of the flare nut by aged deterioration.)
• To prevent gas leakage, apply refrigeration oil only to the inner surface of the flare. (Use refrigeration oil for R32)
• Use torque wrenches when tightening the flare nuts to prevent damage to the flare nuts and gas leakage.
Align the centres of both flares and tighten the flare nuts 3 or 4 turns by hand. Then tighten them fully with the torque wrenches.
2-1. Caution on piping handling
1) Protect the open end of the pipe against dust and moisture.
2) All pipe bends should be as gentle as possible. Use a pipe bender
for bending.
A
A
(Cut exactly at
right angles.)
Remove burrs.
Flaring
Set exactly at the position shown below.
Die
0-0.5mm
Clutch-type
Flare tool for
R32
1.0-1.5mm
Clutch-type
(Rigid-type)
1.5-2.0mm
Wing-nut type
(Imperial-type)
Conventional flare tool
Flare’s inner surface
must be flaw-free.
The pipe end must
be evenly flared in a
perfect circle.
Make sure that the
flare nut is fitted.
Check
Do not apply refrigeration
oil to the outer surface.
Flare nut
Apply refrigeration oil to
the inner surface of the
flare.
Do not apply refrigeration oil to
the flare nut to avoid tightening
with excessive torque.
[Apply oil]
Piping union
Flare nut
Spanner
[Tighten]
1/4 inch
3/8 inch
1/2 inch
5/8 inch
15, 20, 25, 35 class
42, 50, 60 class
71 class
Torque wrench
Flare nut tightening torque
Gas side
32.7-39.9N • m
(330-407kgf • cm)
49.5-60.3N • m
(505-615kgf • cm)
61.8-75.4N • m
(630-770kgf • cm)
14.2-17.2N • m
(144-175kgf • cm)
Liquid side
Wall
If no flare cap is
available, cover the
flare mouth with
tape to keep dirt
or water out.
Be sure to
place a cap.
Rain
3PEN393185-7L.book Page 12 Friday, February 26, 2016 7:49 AM
Summary of Contents for CTXM15M2V1B
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