Daikin SkyAir RZQ18PVJU, Installation Manual

Page: 10 / 19

9 English
(Flux has an extremely negative effect on refrigerant piping
systems. For instance, if chlorine based fl ux is used, it will
cause pipe corrosion. Flux containing fl uorine will damage
refrigerant oil.)
NOTE
Maximum piping length between the outdoor and indoor unit •
is 230ft.
Installation tools:
•
Make sure to use installation tools (gauge manifold charge
hose, etc.) that are exclusively used for R410A installations
to withstand the pressure and to prevent foreign materials
(e.g. mineral oils such as SUNISO and moisture) from
mixing into the system.
(The screw specifi cations differ for R410A and R407C.)
Vacuum pump (use a 2-stage vacuum pump with a non-
return valve):
Make sure the pump oil does not fl ow oppositely into the
1.
system while the pump is not working.
Use a vacuum pump which can evacuate to –14.6 psi.
2.
Selection of piping material 6-1
Foreign materials inside pipes (including oils for fabrication)
1.
must be 9mg/10ft. or less.
Use the following material specifi cation for refrigerant
2.
pipping:
construction material: Phosphoric acid deoxidized seam- •
less copper for refrigerant.
size: Determine the proper size referring to chapter
•
“Example of connection”.
Protection of piping 6-2
Protect the pipings to prevent moisture and dusts from •
coming into the pipings.
Especially, pay attention when passing the pipings through a
•
hole or connecting the end of piping to the outdoor.
Location Working period Protection method
Outdoor
1 month or more Pinch pipes
Less than 1 month
Pinch or tape pipes
Indoor Regardless of period
Piping connection 6-3
For handling of stop valves, refer to “Stop valve opera- •
tion method” in “6-7 Additional refrigerant charge”.
Only use the fl are nuts attached to the stop valves.
•
Using different fl are nuts may cause the refrigerant to
leak.
Be sure to perform a nitrogen blow when brazing.
•
(Brazing without performing nitrogen replacement or releasing
nitrogen into the piping will create large quantities of oxidized
fi lm inside the pipes, adversely affecting valves and compressor
in the refrigerating system and preventing normal operation.)
DANGER
Use of oxygen could cause an explosion resulting in severe •
injury or death. Only use nitrogen gas.
Refrigerant gas may produce toxic gas if it comes in contact
•
with fi re such as from a fan heater, stove or cooking device.
Exposure to this gas could cause severe injury or death.
NOTE
When brazing with blowing nitrogen, set the nitrogen pres- •
sure to 2.9 psi or less by using a pressure reducing valve.
Location to
be brazed
Taping
Refrigerant
piping
Nitrogen
Regulator
Manual valve
Nitrogen
CAUTION
Do not use anti-oxidants when brazing. •
Residue can clog pipes and break the unit.
Do not let any refrigerant other than the specifi ed 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 fl are dimensions. •
When connecting the fl are nuts, apply refrigerant oil to the •
inside and outside of the fl ares and turn them three or four
times at fi rst. (Use ester oil or ether oil.)
See the following table for tightening torque. (Applying too
•
much torque may cause the fl ares to crack.)
After connecting all the pipings perform a gas leak check by
•
using nitrogen.
Pipe size
Tightening
torque (ft·lbf)
Flare dimension
A (in.)
Flare shape (in.)
φ
3/8” 24.1 - 29.4 0.504 - 0.520
A
45°± 2°
9
0°± 2°
R0.016
~0.031
φ
5/8” 45.6 - 55.6 0.760 - 0.776
Ester oil or ether 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 fi nished, make sure to check that there is
no gas leak.
When you keep on tightening the fl are nut with a spanner,
•
there is a point where the tightening torque suddenly in-
creases.
From that position, further tighten the fl are nut the angle
shown below.
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
Disposal requirements
Dismantling of the unit, treatment of the refrigerant, oil and
eventual other parts should be comply the relevant local and
national regulations.
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