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Precautions on refrigerant piping
Do not allow anything other than the designated refrigerant to
get mixed into the freezing cycle, such as air, etc. If any
refrigerant gas leaks while working on the unit, ventilate the
room thoroughly right away.
Use R410A only when adding refrigerant
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 and moisture) from mixing into the system.
Vacuum pump:
Use a 2-stage vacuum pump with a non-return valve
Make sure the pump oil does not flow oppositely into the system
while the pump is not working.
Use a vacuum pump which can evacuate to –100.7 kPa
(5 Torr, –755 mm Hg).
During tests never pressurize the appliances with a pressure
higher than the maximum allowable pressure (see unit name
plate: PS).
In order to prevent dirt, liquid or dust from entering the piping,
cure the piping with a pinch or taping.
Place
Installation period
More than a month
Outdoor unit
Less than a month
Regardless of the
Indoor unit
Great caution is needed when passing copper tubes through
walls.
Refrigerant piping
Field pipes can be installed in four directions.
1
2
3
4
4
Figure - Field pipes in four directions
1
Drill
2
Centre area around knockout hole
3
Knockout hole
4
Slit
5
Connecting pipe
6
Bottom frame
7
Front plate
8
Pipe outlet plate
9
Screw front plate
10
Pipe outlet plate screw
A
Forward
B
Backward
C
Sideways
D
Downward
Protection method
Pinch the pipe
Pinch or tape the pipe
period
7
8
9
10
5
6
A
D
Cutting out the two slits makes it possible to install as shown in
the
figure "Field pipes in four
(Use a metal saw to cut out the slits.)
To install the connecting pipe to the unit in a downward direction,
make a knockout hole by penetrating the centre area around the
knockout hole using a
four
directions".)
After knocking out the knock-out, it is recommended to apply
repair paint to the edge and the surrounding end surfaces to
prevent rusting.
Preventing foreign objects from entering
Plug the pipe through-holes with putty or insulating material
(procured locally) to stop up all gaps, as shown in the figure.
Insects or small animals entering the outdoor unit may cause a short
circuit in the electrical box.
Cautions for handling stop valve
The stop valves for indoor-outdoor connecting piping are closed
at shipment from the factory.
Make sure to keep the valve open during operation.
The names of parts of the stop valve are shown in the figure.
1
2
Since the side boards may be deformed if only a torque wrench
is used when loosening or tightening flare nuts, always lock the
stop valve with a wrench and then use a torque wrench.
Do not place wrenches on the valve cover.
B
C
1
Spanner
2
Torque wrench
Applying an excessive torque may distort the interior stop valve
surface causing gas to leak inside the valve and causing the
flare nut to crack eventually.
Do not apply force on the valve cover, this may result in a
refrigerant leak.
For cooling operation under low ambient temperature or any
other operation under low pressure, apply silicon pad or similar
to prevent freezing of the gas stop valve flare nut (see figure).
Freezing of the flare nut may cause refrigerant leak.
directions".
6 mm drill. (See
figure "Field pipes in
Ø
1
1
Putty or insulating material
(produced locally)
1
Service port
2
Stop valve
3
3
Field piping connection
4
Valve cover
4
Silicon sealing pad
(Make sure there is no gap)
2
Installation manual
6
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