10-4-3. Refrigerant piping connection
<Flaring>
1. Cut the pipe with a pipe cutter.
2. Deburr the inside of the pipe at its end.
Take steps to ensure that the removed burrs will not
enter the pipe.
3. Remove the flare nuts provided with the indoor and
outdoor units, and insert them into the pipe.
4.Flare the pipe.
The projection margin of the pipe must be checked.
5.Check that the flare has the appropriate shape.
Do not use ordinary garden hose, but one can
flatten and prevent water
from draining.
2.
Install the drain nipple and a commercially available
drain hose (with 16 mm
inside diameter), and drain
off the water.
(For the position where the drain nipple is installed,
refer to the installation
diagram of the indoor and
outdoor units.)
•
Check that the outdoor unit is horizontal, and route
the drain hose at a
downward sloped angle while
ensuring that it is connected tautly.
Base plate
Drain nipple
Commercially available
drain hose
Draining the Water
•
Holes are provided on the base plate of the
outdoor unit to ensure that the
defrost water
produced during heating operations is drained
off efficiently.
If a centralized drain is required
when installing the unit on a balcony or
wall,
follow the steps below to drain off the water.
1. Proceed with water-proofing by installing the
water-proof rubber caps in
the 2 elongated holes on
the base plate of the outdoor unit.
[How to install the water-proof rubber caps]
1)
2)
Place four fingers into each cap, and insert the
caps into the water
drain holes by pushing them
into place from the underside of the base
plate.
Press down on the outer circumferences of the
caps to ensure that they
have been inserted tightly
(Water leaks may result if the caps have not been
inserted properly, if
their outer circumferences lift
up or the caps catch on or wedge against
something.)
90
°
Obliquity
Die
Pipe
A
B
C
Roughness
Warp
Pipe
A
B
Flare Nut
Outside
diameter
Thickness
RIDGID
(clutch type)
R32 tool
IMPERIAL
(wing nut
type)
R32 tool
C
Tighten torque
mm
mm
mm
mm
mm
mm
N
•
m
kgf
•
m
6.35
0.8
0 to 0.5
1.5 to 2.0
9.1
17
14 to 18
1.4 to 1.8
9.52
0.8
0 to 0.5
1.5 to 2.0
13.2
22
33 to 42
3.3 to 4.2
●
Do not scratch the inner surface of the fared
part when removing
burrs.
●
Flare processing under the condition of
scratches on the inner
surface of fare
processing part will cause refrigerant gas leak.
●
Tightening torque for connection of flare pipe
The
pressure of R32 is higher than R22
(Approx. 1.6 times). Therefore securely
tighten the flare pipes which connect the
outdoor unit
and the indoor unit with the
specified tightening torque
using a torque
wrench. If any flare pipe is incorrectly
connected, it may cause not only
a gas leakage but also trouble in the
refrigeration cycle.
Flare at
indoor unit side
Flare at
outdoor unit side
CAUTION
Fig. 10-
4
-
3
Fig. 10-
4
-
4
Fig. 10-
4
-
5
Base plate
Drain nipple
Water-proof rubber caps
(supplied with the outdoor unit)
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