25
Installation and Maintenance
Service Manual
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7. Flaring the Pipe End
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(2) Prevent mineral oil from getting into the system as this would reduce the lifetime of the units.
(3) Never use piping which had been used for previous installations. Only use parts which are delivered with the unit.
(4) Do never install a drier to this R410A unit in order to guarantee its lifetime.
(5) The drying material may dissolve and damage the system.
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8. Connecting the Refrigerant Pipe
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Caution on Piping Handling
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Make sure that the
flare nut is fitted
The pipe end must
be evenly flared in
a perfect circle
Flare’s inner
surface must
be scratch-free
Cut exactly
at right
angles
Renove
burrs
Flaring
Set exactly at the position shown below
A
Die
A
0-0.5mm
1.0-1.5mm
1.5-2.0mm
Flare tool for R410A
Clutch-type
Clutch-type
(Rigid-type)
Wing-nut type
(lmperial-type)
Conventional flare tool
Wrench
Indoor unit tubing
Open-end wrench (fixed)
Connection pipe
Flare nut
Coat here with refrigeration oil
Be sure to
place a cap.
If no flare cap is
available,cover
the flare mouth
with tape to keep
dirt or water out.
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Gas side
Liquid side
09/12K
18K
09K/12K/18K
LQFK
LQFK
LQFK
31-35 N.m
50-55 N.m
15-20 N.m
CAUTION
