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5
Refrigerant Piping
Leading out the pipes
• The indoor/outdoor unit connecting pipes can be connected in any of 4 directions. Use a screwdriver to punch out
the knockout part of the front panel, side panel or base. Wear heavy work gloves to protect yourself from injury
while doing this work. After punching out the knockout hole in a manner which ensures that the pipes and wires will
not be damaged in any way, remove the burrs from around the hole.
Optional installation parts (locally procured)
Parts name
Refrigerant piping
A
Liquid side: Ø9.52 mm
Gas side: Ø15.88 mm or Ø19.05 mm
Pipe insulating material
B
(polyethylene foam, 10 mm thick)
C
Putty, PVC tape
REQUIREMENT
Follow the instructions in the installation manual provided with the branch pipe kit and the instructions in the
installation manual of the indoor unit to connect the refrigerant pipe between the branch pipe and indoor unit.
EN-25
Rear
Side
Front
Bottom
Q'ty
One each
1
One each
– 13 –
Refrigerant piping connection
CAUTION
TAKE NOTE OF THESE 4 IMPORTANT POINTS BELOW FOR
PIPING WORK
1. Keep dust and moisture away from inside the connecting pipes.
2. Tightly connect the connection between pipes and the unit.
3. Evacuate the air in the connecting pipes using a VACUUM PUMP.
4. Check for gas leaks at connection points.
Pipe connection method
Flaring
1. Cut the pipe with a pipe cutter.
90°
2. Remove the burr inside of the pipe. When removing the burr, be careful so that chips do not fall into the pipe.
3. Remove the flare nuts attached to the outdoor / indoor unit, then insert them into each of the pipes.
4. Flare the pipes. See the following table for the projection margin (A) and flaring size (B).
A
Pipe
Rigid
Outside
Thickness
(clutch type)
diameter
R410A tool
mm
mm
6.35
0.8
0 to 0.5
9.52
0.8
0 to 0.5
12.70
0.8
0 to 0.5
15.88
1.0
0 to 0.5
19.05
1.2
0 to 0.5
* In case of flaring for R410A with the conventional flare tool, pull the tool out approx. 0.5 mm more than that for R22
to adjust it to the specified flare size. The copper pipe gauge is useful for adjusting the projection margin size.
Obliquity
B
A
B
Imperial
Width across
(wing nut type)
flat
R410A tool
mm
mm
mm
mm
1.0 to 1.5
9.9
17
1.0 to 1.5
13.2
22
1.0 to 1.5
16.6
26
1.0 to 1.5
19.7
29
1.0 to 1.5
24.0
36
Installation Manual
Roughness
Warp
Flare Nut
Tighten torque
N•m
kgf•m
14 to 18
1.4 to 1.8
33 to 42
3.3 to 4.2
49 to 61
4.9 to 6.1
63 to 77
6.6 to 7.7
100 to 120
10.0 to 12.0
EN-26
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