Refrigerant Piping Work - Daikin CTXM15M2V1B Installation Manual

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.
Do not apply refrigeration oil to
the flare nut to avoid tightening
with excessive torque.
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.
12
[Apply oil]
Do not apply refrigeration
oil to the outer surface.
Flare nut
Flare nut tightening torque
Gas side
15, 20, 25, 35 class 42, 50, 60 class
3/8 inch
32.7-39.9N • m 49.5-60.3N • m
(330-407kgf • cm) (505-615kgf • cm)
Set exactly at the position shown below.
A
Die
A
Apply refrigeration oil to
the inner surface of the
flare.
71 class
1/2 inch 5/8 inch
61.8-75.4N • m
(630-770kgf • cm)
(Cut exactly at
right angles.)
Remove burrs.
Flaring
Flare tool for
Conventional flare tool
R32
Clutch-type
Clutch-type
(Rigid-type)
0-0.5mm 1.0-1.5mm
Check
Flare's inner surface
must be flaw-free.
[Tighten]
Torque wrench
Spanner
Piping union
Flare nut
Liquid side
1/4 inch
14.2-17.2N • m
(144-175kgf • cm)
Be sure to
place a cap.
Rain
If no flare cap is
available, cover the
flare mouth with
tape to keep dirt
or water out.
Wing-nut type
(Imperial-type)
1.5-2.0mm
The pipe end must
be evenly flared in a
perfect circle.
Make sure that the
flare nut is fitted.
Wall
English