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2. 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.
• Do never install a drier 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.
CAUTION
Do not reuse joints which have been used once already.
3. 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 R32.)
3) Use torque wrenches when tightening the fl
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.
[Apply oil]
Apply refrigeration oil to the inner surface of the flare.
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.
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.
2. Selection of copper and heat insulation materials
When using commercial copper pipes and fittings, observe the following:
1) Insulation material: Polyethylene foam
Heat transfer rate: 0.041 to 0.052W/mK (0.035 to 0.045kcal/(mh •°C))
Refrigerant gas pipe's surface temperature reaches 110°C max.
Choose heat insulation materials that will withstand this temperature.
2) Be sure to insulate both the gas and liquid piping and to provide
insulation dimensions as below.
Minimum bend
Piping size, mm (in)
radius
6.40 (1/4")
30mm or more
. 9
2 5
3 (
8 /
) "
0 3
m
m
1
. 2
0 7
1 (
2 /
) "
0 4
m
m
15.88 (5/8")
50mm or more
1
. 9
5 0
3 (
4 /
) "
0 5
m
m
3) Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
are nuts to prevent damage to the flare nuts and gas leakage.
Thermal insulation
Piping thickness
size
I.D. 8-10mm
0.8mm
r o
m
o
e r
I
D .
1 .
(C1220T-O)
r o
m
o
e r
I
D .
1 .
I.D. 16-20mm
1.0mm
(C1220T-O)
r o
m
o
e r
I
D .
2 .
Set exactly at the position shown below.
Pipe Size,
A
6.35 (1/4")
Die
9.52 (3/8")
12.70 (1/2")
15.88 (5/8")
19.05 (3/4")
Flare's inner surface
must be fl aw-free.
[Tighten]
Torque wrench
Spanner
Pipe union
Flare nut
Pipe Size, mm (in)
. 6
0 4
1 (
4 /
) "
. 9
2 5
3 (
8 /
) "
1
. 2
0 7
1 (
2 /
) "
1
. 5
8 8
5 (
8 /
) "
1
. 9
5 0
3 (
4 /
) "
Rain
Thermal insulation
thickness
- 2
5 1
m
m
- 4
6 1
m
m
10mm Min.
- 0
4 2
m
m
Installation Guideline
(Cut exactly at
right angles.)
Remove burrs.
Flaring
A (mm)
Flare Tool for
Conventional flare tool
R32/R410A
mm (in)
Clutch-type
Clutch-type
(Ridgid-type)
0-0.5
1.0-1.5
0-0.5
1.0-1.5
0-0.5
1.0-1.5
0-0.5
1.0-1.5
0-0.5
1.0-1.5
Check
The pipe end must be evenly fl ared
in a perfect circle.
Make sure that the fl are
nut is fi tted.
Torque, Nm/(ft-lb)
1
( 8
3 1
) 3 .
4
( 2
1 3
) 0 .
5
( 5
0 4
) 6 .
6
( 5
8 4
) 0 .
7
( 8
7 5
) 6 .
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.
Inter-unit wire
Gas pipe
Liquid pipe
Liquid pipe
Gas pipe
insulation
insulation
Finishing tape
Drain hose
Wing-nut type
(Imperial-type)
1.5-2.0
1.5-2.0
2.0-2.5
2.0-2.5
2.0-2.5
19
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