Flaring The Pipe End; Refrigerant Piping - Daikin RXS20CVMB Instruction Manual

Outdoor Unit Installation
3.

Flaring the Pipe End

1) Cut the pipe end with a pipe cutter.
2) Remove burrs with the cut surface facing down-
ward 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.
4.

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 oil on both inner and outer surfaces of the flare. (Use refrigeration oil for
R410A)
32.7-39.9N m
(333-407kgf cm)
5
Coat here with refrigeration oil
Flare nut tightening torque
Gas side Liquid side
3/8 inch 1/4 inch
14.2-17.2N m
(144-175kgf cm)
Cut exactly at
right angles.)
Set exactly at the position shown below.
A
Flare tool for R410A
Clutch-type
Die A 0-0.5mm
Torque wrench
Spanner
Piping union
Flare nut
Valve cap tightening torque
Gas side
3/8 inch
21.6-27.4N m 21.6-27.4N m
(220-280kgf cm) (220-280kgf cm)
Service port cap 10.8-14.7N m
tightening torque (110-150kgf cm)
Remove burrs
Flaring
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
Flare’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
■English