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51 31 11
Flaring
•
Use special pipe cutter and flare tool exclusive
for R410A.
(1) Cut the connection pipe to the necessary
length with a pipe cutter.
(2) Hold the pipe downward so that the cuttings
will not enter the pipe and remove any 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. Leakage of
refrigerant may result if other flare nuts are used.
(4) Protect the pipes by pinching them or with
tape to prevent dust, dirt, or water from
entering the pipes.
•
When using conventional flare tools to flare
R410A pipes, the dimension A should be
approximately 0.5mm (0.02in.) 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.
51 31 21
Bending pipes
•
To prevent breaking of the pipe, avoid sharp bends. Bend the pipe with a radius of curvature of 100mm (4in.) or
more.
•
If the pipe is bent repeatedly at the same place, it will break.
•
If pipes are shaped by hand, be careful not to collapse them.
•
Do not bend the pipes at an angle of more than 90°.
•
When pipes are repeatedly bent 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 3 times.
51 31 31
Pipe connection
•
Be sure to install the pipe against the port on the indoor unit and the 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.
•
Do not remove the flare nut from the outdoor unit pipe until immediately before connecting the connection pipe.
•
After installing the piping, make sure that the connection pipes do not touch the compressor or outer panel. If the
pipes touch the compressor or outer panel, they will vibrate and produce noise.
(1) Detach the caps and plugs from the pipes.
(2) Center the pipe against the port on the outdoor unit, and
then turn the flare nut by hand.
(3) Tighten the flare nut of the connection pipe at the
outdoor unit valve connector.
After tightening the flare nut by hand, use a torque
(4)
wrench to fully tighten it.
Check if [L] is flared uniformly
and is not cracked or scratched.
L
Pipe outside
Dimension A (mm (in1))
Flare tool for R410A,
diameter
clutch type
[mm (in1)]
6.35 (1/4)
9.52 (3/8)
0 to 0.5
12.70 (1/2)
(0 to 0.02)
15.88 (5/8)
Width across flats
Pipe outside
diameter
[mm (in1)]
6.35 (1/4)
9.52 (3/8)
12.70 (1/2)
15.88 (5/8)
CAUTION
CAUTION
3-way valve (Liquid)
Flare nut
Connection pipe
(Liquid)
Die
A
Pipe
Dimension B
[mm (in1)]
9.1 (11/32)
13.2 (17/32)
16.6 (21/32)
19.7 (25/32)
Width across flats
of Flare nut
[mm (in1)]
17 (21/32)
22 (7/8)
26 (1-1/32)
29 (1-5/32)
3-way valve (Gas)
Flare nut
Connection pipe
(Gas)
B
0
- 014
En-15
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