Unit installation

2
CONNECTING THE PIPE
2. BENDING PIPES
The pipes are shaped by your hands. Be careful not to collapse them.
Do not bend the pipes in an angle more than 90°.
When pipes are repeatedly bend or stretched, the material will harden,
making it difficult to bend or stretch them any more. Do not bend or stretch
the pipes more than three times.
CAUTION
1 To prevent breaking of the pipe, avoid sharp bends.
Bend the pipe with a radius of curvature of 150 mm (6")
or over.
2 If the pipe is bent repeatedly at the same place, it will
break.
3. CONNECTION PIPES
Outdoor unit
(1) Detach the caps and plugs from the pipes.
CAUTION
1 Be sure to apply the pipe against the port on the in-
door unit and outdoor unit correctly. If the centering is
improper, the flare nut cannot be tightened smoothly. If
the flare nut is forced to turn, the threads will be
damaged.
2 Do not remove the flare nut from the indoor unit pipe
until immediately before connecting the connection
pipe.
(2) Centering the pipe against port on the indoor unit, turn the flare nut
with your hand.
To prevent gas leakage, coat the flare
surface with alkylbenzene oil (HAB).
Do not use mineral oil.
(3) Attach the connection pipe.
Frare nut
Connection pipe
(Liquid)
Connection pipe
(Gas)
Frare nut
3-way valve (Gas)
2-way valve
(Liquid)
CAUTION
1 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.
2 While welding the pipes, be sure to blow dry nitrogen
gas through them.
3 The maximum lengths of this product are shown in the
table. If the units are further apart than this, correct
operation can not be guaranteed.
1. FLARING
(1) Cut the connection pipe to the necessary length with a pipe cutter.
(2) Hold the pipe downward so that cuttings will not enter the pipe and
remove the burrs.
(3) Insert the flare nut (always use the flare nut attached to the indoor
and outdoor units respectively) onto the pipe and perform the flare
processing with a flare tool.
Use the special R410A flare tool, or the conventional flare tool.
When using conventional flare tools to flare R410A pipes, the dimension
A should be approximately 1/32 in. more than indicated in the table
(for flaring with R410A flare tools) to achieve the specified flaring. Use a
thickness gauge to measure the dimension A.
Pipe outside
diameter
Width across flats
of Flare nut
Width across flats
Check if [L] is flared uniformly
and is not cracked or scratched.
B
Die
A
Pipe
6.35 mm (1/4 in.)
9.52 mm (3/8 in.)
12.70 mm (1/2 in.)
15.88 mm (5/8 in.)
19.05 mm (3/4 in.)
0 to 0.5
(0 to 1/32 in.)
Pipe outside diameter
Dimension A (mm)
Flare tool for R410A, clutch type
6.35 mm (1/4 in.)
9.52 mm (3/8 in.)
12.70 mm (1/2 in.)
15.88 mm (5/8 in.)
19.05 mm (3/4 in.)
9.1 (3/8 in.)
13.2 (17/32 in.)
16.6 (21/32 in.)
19.7 (25/32 in.)
24.0 (15/16 in.)
Pipe outside diameter
Dimension B
(mm)
0
-0.4
6.35 mm (1/4 in.)
9.52 mm (3/8 in.)
12.70 mm (1/2 in.)
15.88 mm (5/8 in.)
19.05 mm (3/4 in.)
17 mm (11/16 in.)
22 mm (7/8 in.)
26 mm (1-1/32 in.)
29 mm (1-5/32 in.)
36 mm (1-13/32 in.)