Refrigerant Piping Work; Flaring The Pipe End - Daikin FTXS25G2V1B Installation Manual

Refrigerant Piping Work

With a multi indoor unit
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
1) Do not use mineral oil on flared part.
2) Prevent mineral oil from getting into the system as this would reduce the lifetime of the units.
3) Never use piping which has been used for previous installations. Only use parts which are delivered with the unit.
4) Do never install a drier to this R410A unit in order to guarantee its lifetime.
5) The drying material may dissolve and damage the system.
6) Incomplete flaring may cause refrigerant gas leakage.
2.
Refrigerant piping.
CAUTION
1) Use the flare nut fixed to the main unit. (To prevent cracking of the flare nut by aged deterioration.)
2) To prevent gas leakage, apply refrigeration oil only to the inner surface of the flare. (Use refrigeration oil for R410A.)
3) 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.
Flare nut
Do not apply refrigeration
oil to the flare nut avoid
tightening with over torque.
11
, install as described in the installation manual supplied with the Multi outdoor unit.
[Apply oil]
Do not apply refrigeration
oil to the outer surface.
Flare nut tightening torque
Gas side
20/25/35/42 class
3/8 inch
32.7-39.9N m
(330-407kgf cm) (505-615kgf cm)
(Cut exactly at
right angles.)
Set exactly at the position shown below.
A Flare tool for R410A
A
Die
Apply refrigeration oil to
the inner surface of the
flare.
Spanner
Piping union
Liquid side
50 class
1/2 inch 1/4 inch
49.5-60.3N m 14.2-17.2N m
(144-175kgf cm)
Remove burrs
Flaring
Conventional flare tool
Clutch-type Clutch-type (Rigid-type) Wing-nut type (Imperial-type)
0-0.5mm 1.0-1.5mm
Check
Flare's inner
surface must
be flaw-free.
[Tighten]
Torque wrench
Flare nut
1.5-2.0mm
The pipe end must
be evenly flared in
a perfect circle.
Make sure that the
flare nut is fitted.
■English