Refrigerant Piping Work - Daikin R-410A Split series 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.
I I I I 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 R-410A 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.
Coat here with refrigeration machine oil
2) To prevent gas leakage, apply refrigeration machine oil on both inner and outer surfaces of the flare. (Use refrigeration oil
for R-410A)
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 40 mm or larger.)
IEnglish
, install as described in the installation manual supplied with the Multi outdoor unit.
Torque wrench
Spanner
Piping union
Flare nut
(Cut exactly at
right angles.)
Flaring
Set exactly at the position shown below.
A
Die
Check
Flare's inner
surface must
be flaw-free.
Flare nut tightening torque
Gas side
3/8 inch
l
32.7-39.9N m 14.2-17.2N
l
(333-407kgf cm) (144-175kgf
Valve cap tightening torque
Gas side Liquid side
3/8 inch
l
21.6-27.4N m 21.6-27.4N
l
(220-280kgf cm) (220-280kgf
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.
Remove burrs
A
RIGID 0.5 mm
IMPERIAL 1.0 mm
The pipe end must
be evenly flared in
a perfect circle.
Make sure that the
flare nut is fitted.
Liquid side
1/4 inch
l
m
l
cm)
1/4 inch
l
m
l
cm)
Wall
10