Daikin ARXM25M2V1B Installation Manual page 9

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
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.
• Protect or enclose refrigerant tubing to avoid mechanical damage.
4.
Refrigerant piping work
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 R410A or R32.)
• Use torque wrenches when tightening the flare nuts to prevent damage to the flare nuts and gas leakage.
• After the piping work is finished (after checking for gas leaks), open the stop valves or the compressor might break down.
• 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.
Spanner
Piping union
Gas side
3/8 inch
32.7-39.9N • m
(333-407kgf • cm)
4-1 Cautions on pipe 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.
English
[Tighten]
Torque wrench
Flare nut
Flare nut tightening torque
Liquid side
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/R32
Clutch-type
A 0-0.5mm
Die
Do not apply refrigeration
oil to the outer surface.
Flare nut
Do not apply refrigeration oil to
the flare nut to avoid tightening
with excessive torque.
Valve cap tightening torque
Gas side
3/8 inch
21.6-27.4N • m
(220-280kgf • cm)
Service port cap tightening torque
10.8-14.7N • m (110-150kgf • cm)
Rain
Remove burrs.
Flaring
Conventional flare tool
Clutch-type (Ridgid-type) Wing-nut type (Imperial-type)
1.0-1.5mm 1.5-2.0mm
Check
The pipe end must
be evenly flared in
Flare's inner surface
a perfect circle.
must be flaw-free.
Make sure that the
flare nut is fitted.
[Apply oil]
Apply refrigeration oil to
the inner surface of the
flare.
Liquid side
1/4 inch
21.6-27.4N • m
(220-280kgf • cm)
Be sure to
place a cap.
If no flare cap is
available, cover the
flare mouth with
tape to keep dirt
or water out.
Wall
6