9
NOTE
• When brazing with blowing nitrogen, set the nitrogen pressure to
2.9 psi or less by using a pressure reducing valve.
CAUTION
• Do not use anti-oxidants when brazing.
Residue can clog pipes and break the unit.
Do not let any refrigerant other than the specified refrigerant enter
the refrigerant system.
Do not let any gas such as air enter the refrigerant system.
〈〈〈〈
Precautions when connecting the pipings
〉〉〉〉
• See the following table for flare dimensions.
• When connecting the flare nuts, apply refrigerant oil to the inside and
outside of the flares and turn them three or four times at first.
(Use ester oil or ether oil.)
• See the following table for tightening torque. (Applying too much
torque may cause the flares to crack.)
• After connecting all the pipings perform a gas leak check by using
nitrogen.
• If you are obliged to install the unit without a torque wrench, you may
follow the installation method mentioned below.
After the work is finished, make sure to check that there is no gas leak.
• When you keep on tightening the flare nut with a spanner, there is a
point where the tightening torque suddenly increases.
From that position, further tighten the flare nut the angle shown below.
Disposal requirements
Dismantling of the unit, treatment of the refrigerant, oil and eventual
other parts should be comply the relevant local and national regulations.
6-4 Refrigerant piping work procedure
The field piping can be connected in four directions.
∗
When connecting the piping in the lateral direction (on the rear),
remove the piping cover (rear) and receiver mounting plate in refer-
ence to the figure below.
When connecting the pipings downward, remove the knockout by
making four holes in the middle on the each side of the knockout with
a drill.
Then cut out the corner of the bottom frame along the slits (in two
positions) by using a hacksaw.
After removing the parts, it is recommended to apply repair paint on
the edges, to prevent rusting.
• Make sure that the field pipings do
not touch the terminal cover of the
compressor.
Especially when the insulation pro-
vided on the liquid piping touches
the terminal cover, adjust it’s height
as shown in the right figure. Make
sure also that the piping does not
touch the bolts of the compressor
and the outer panels.
• When it is expected that water con-
densed in the stop valve will reach
the indoor unit through the gap
between the heat insulating material
and the piping (for example, when
the outdoor unit is installed in a
higher position than the indoor unit),
take proper action such as caulking
the connection area.
Pipe size
Tightening
torque (ft·lbf)
Flare dimension A (in.)
Flare shape (in.)
φ
3/8”
24.1 - 29.4
0.504 - 0.520
φ
5/8”
45.6-55.6
0.760 - 0.776
Pipe size
Tightening angle
(Guideline)
Recommended arm
length of tool (in.)
φ
3/8”
60°~90°
Approx. 7 7/8
φ
5/8”
30°~60°
Approx. 11 13/16
Location to
be brazed
Taping
Refrigerant
piping
Nitrogen
Regulator
Manual valve
Nitrogen
A
45
°
±2
°
90
°
±2
°
R0.016
~0.031
Refrigerant oil
Cautions on connecting the connection piping
Piping cover
Screw for
front panel
Screw for piping
cover (front)
Front
panel
Lateral
direction
Front direction
Rear
direction
Downward
direction
Receiver mounting plate
Piping cover (rear)
Field pipings
Bottom frame
Knockout
Drill
Slit
Middle on the side
Slit
Terminal cover
Insulation
Bolt
Caulking, etc.
Compressor
Liquid piping
01_EN_3PN05597-5R.fm Page 9 Wednesday, September 14, 2005 8:35 PM
