90
Obliquity Roughness Warp
Refrigerant Piping Connection
1. Cut the pipe with a pipe cutter.
2. Insert a fl are nut into the pipe and fl are the pipe.
Projection margin in fl aring : A (Unit : mm)
RIDGID (clutch type)
IMPERIAL (wing nut type)
Outer dia. of copper pipe
Ø6.35 1.5 to 2.0
Ø9.52 1.5 to 2.0
Ø12.70 2.0 to 2.5
Pipes thickness 0.8 mm or more
Outer dia.
of copper pipe
Conventional tool
used
Ø6.35 0 to 0.5 1.0 to 1.5
Ø9.52 0 to 0.5 1.0 to 1.5
Ø12.70 0 to 0.5 1.0 to 1.5
Pipes thickness 0.8 mm or more
Flaring
A
Die
Pipe
CAUTION
Do not scratch the inner surface of the fl ared part when removing burrs.
Flare processing under the condition of scratches on the inner surface
of fl are processing part will cause refrigerant gas leak.
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 effi ciently.
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-proofi ng 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) Place four fi ngers into each cap, and insert the caps into the water drain
holes by pushing them into place from the underside of the base plate.
2) 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.)
Water-proof rubber caps
(supplied with the outdoor unit)
Base plate
Drain nipple
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
Do not use ordinary garden hose, but one can fl atten and prevent water
from draining.
Flare nut
Half union
Externally
threaded side
Internally
threaded side
Use a wrench to secure. Use a torque wrench to tighten.
CAUTION
Align the centers of the connecting pipes and tighten the fl are nut as far as
possible with your fi ngers. Then tighten the nut with a spanner and torque
wrench as shown in the fi gure.
Tightening connection
Do not apply excess torque. Otherwise, the nut may crack depending on
the conditions.
(Unit : N·m)
Outer dia. of copper pipe Tightening torque
Ø6.35 mm 14 to 18 (1.4 to 1.8 kgf·m)
Ø9.52 mm 30 to 42 (3.0 to 4.2 kgf·m)
Ø12.70 mm 50 to 62 (5.0 to 6.2 kgf·m)
Flare at
indoor unit side
Flare at
outdoor unit side
Tightening torque of fl are pipe connections
The operating pressure of R32 is
higher than that of R22 (approx.
1.6 times). It is therefore necessary
to fi rmly tighten the fl are pipe
connecting sections (which connect
the indoor and outdoor units) up to the
specifi ed tightening torque. Incorrect
connections may cause not only a
gas leakage, but also damage to the
refrigeration cycle.
Tool used
Tool used
7
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