Daikin RZQ24MVJU Installation Manual page 9

NOTE
• When brazing with blowing nitrogen, set the nitrogen pressure to
2.9 psi or less by using a pressure reducing valve.
Refrigerant
Location to
piping
be brazed
Nitrogen
Taping
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.
Tightening
Pipe size Flare dimension A (in.)
torque (ft·lbf)
24.1 - 29.4 0.504 - 0.520
φ3/8"
φ5/8"
45.6-55.6 0.760 - 0.776
Refrigerant oil
• 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.
Tightening angle
Pipe size
(Guideline)
φ 3/8" 60°~90°
φ 5/8" 30°~60°
Disposal requirements
Dismantling of the unit, treatment of the refrigerant, oil and eventual
other parts should be comply the relevant local and national regulations.
Regulator
Nitrogen
Manual valve
Flare shape (in.)
R0.016
~0.031
Recommended arm
length of tool (in.)
Approx. 7 7/8
Approx. 11 13/16
6-4 Refrigerant piping work procedure
The field piping can be connected in four directions.
Screw for
front panel
Front direction
Screw for piping
cover (front)
∗ 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.
Drill
Middle on the side
Knockout
Slit
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.
Cautions on connecting the connection piping
• 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.
Front
panel
Piping cover
Rear
direction
Lateral
direction
Downward
direction
Receiver mounting plate
Piping cover (rear)
Slit
Field pipings
Bottom frame
Liquid piping
Terminal cover
Compressor
Caulking, etc.
Insulation
Bolt
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