Refrigerant Piping Work; Flaring The Pipe End; Caution On Piping Handling - Daikin FTXG25EV1BS 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
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
1) 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.
• Use torque wrenches when tightening the flare nuts
to prevent damage to the flare nuts and escaping
gas.
2) To prevent gas leakage, apply refrigeration machine oil on both inner and outer surfaces of the flare. (Use refrigeration oil
for R410A.)

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.
(Bending radius should be 30 to 40mm or larger.)
IEnglish
Set exactly at the position shown below.
Coat here with refrigeration machine oil
(Cut exactly at
right angles.)
Flaring
)
Flare tool for R410A
Clutch-type
)
0-0.5mm
Die
Flare nut tightening torque
Gas side
3/8 inch 1/2 inch
l
32.7-39.9N m 49.5-60.3N
l
(333-407kgf cm) (505-615kgf
Torque wrench
Spanner
Piping union
Flare nut
Rain
Remove burrs
Conventional flare tool
Clutch-type (Rigid-type) Wing-nut type (Imperial-type)
1.0-1.5mm 1.5-2.0mm
Check
.
The pipe end must
lare’s inner
be evenly flared in
surface must
a perfect circle.
be flaw-free.
Make sure that the
flare nut is fitted.
Liquid side
1/4 inch
l l
m 14.2-17.2N m
l l
cm) (144-175kgf cm)
Wall
Be sure to
place a cap.
If no flare cap is
available, cover
the flare mouth
with tape to keep
dirt or water out.
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