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Control box
Pipe heat insulation
& Pipe rubber
Safety drain pan
Be sure to use wet cloth, etc., to protect the pipe rubber, pipe heat insulation, heat
exchanger thermistor, and the heat insulation of the safety drain pan as shown below.
Because these parts are extremely flammable, they can cause a fire if they are not
properly protected.
In case the heat exchanger thermistor may be damaged by heat of brazing, which lead
to failure of normal operation. (AR96 only)
The heat exchanger contains a thermistor.
Completely cover the pipe rub-
ber and pipe heat insulation with
wet cloth, etc., to prevent them
from burning.
Pipe heat insulation
Pipe rubber
Brazing
Pipe rubber
Pipe heat insulation
Do not expose the unit (control box, rear panel, maintenance panel, etc.) and the inlet
grille to the flame. The exposure of these parts to the flame will adversely affect their
appearance and functions or cause a fire.
If air or another type of refrigerant enters the refrigeration cycle, the internal pressure in
the refrigeration cycle will become abnormally high and prevent the unit from exerting its
full performance.
Apply nitrogen gas while braz-
ing the pipes. Nitrogen gas
pressure:
2.9 psi (0.02 MPa) (= pressure
felt sufficiently on the back of
your hand)
If a pipe is brazed without applying nitrogen gas, it will create an oxidation film.
This can degrade performance or damage the parts in the unit (such as the compressor
or valves).
Do not use flux to braze pipes. If the flux is the chlorine type, it will cause the pipes to
corrode. Furthermore, if the flux contains fluoride, it will adversely affect the refrigerant
pipe system such as by degrading the refrigerant oil.
For brazing material, use phosphor copper that does not require flux.
4.5. Installing heat insulation
• Install the coupler heat insulation after completing the refrigerant leak check (for details,
refer to the Installation Manual for the outdoor unit).
• There should be no gaps between the insulation and the product.
Rear panel
Thermistor
Maintenance panel
Connection Pipe (liquid)
Connection Pipe (gas)
WARNING
Protect these areas with wet cloth, etc.
Do not expose the
thermistor to the flame.
CAUTION
Pressure regulating valve
Cap
Nitrogen gas
Brazing area
Cable tie (large) (accessories)
No gap
Cable tie (large) (accessories)
No gap
5. INSTALLING DRAIN PIPES
• Use general hard polyvinyl chloride pipe ø 3/4 in [I.D.], ø 1-1/16 in [O.D.] and connect it
with adhesive (polyvinyl chloride) so that there is no leakage.
• The position of the installed drain pipe should have a downward gradient of 1/100 or
more.
• To prevent the pipe from freezing, use a heat insulation material as needed.
Position of drain piping
ARUH 72
7-7/8 (200)
Safety drain port
Main drain port
Ø 3/4 (19) [I.D.]
Ø 1-1/16 (27) [O.D.]
ARUH 96
7-7/8 (200)
Safety drain port
Main drain port
Ø 3/4 (19) [I.D.]
Ø 1-1/16 (27) [O.D.]
Drain pipe
• For main drain port
• For safety drain port
• This product has drain ports in 2 locations. Follow the procedure in the figure to connect
drain hose and drain pipes to each of them.
Install the drain hose to the main and safety drain port
Working procedure
(1) Install the attached drain hose to the main and safety drain port of the body. Install
the hose band from the top of the hose within the graphic display area. Secure firmly
with the hose band.
(2) Use vinyl adhesive agent to glue the drain piping (PVC pipe) [Φ 3/4 in (19 mm) I.D.
Φ 1-1/16 in (27 mm) O.D.] which is prepared on site or piping socket. (Apply color
adhesive agent evenly until the gauge line and seal)
(3) Check the drainage.
(4) Install the heat insulation.
(5) Use the attached heat insulation to insulate the drain port and band parts of the body.
Drain hose
For main drain port
(large)
Drain hose
For safety drain port
(small)
Drain pan
3/8 to 9/16 in
(10 to 15 mm)
Coupler heat insulation (small)
(accessories)
Coupler heat insulation (large)
(accessories)
Unit: in (mm)
1-9/16 (40)
Unit: in (mm)
1-9/16 (40)
O.D.
Φ 3/4 in (19 mm) [I.D.],
Φ 1-1/16 in (27 mm) [O.D.]
Accessories
Hose band
Drain hose insula-
(large)
tion
Hose band
Drain hose insula-
(small)
tion
Ensure there is no space
Hose band
(accessories)
Soft PVC side
Drain hose
(accessories)
En-6
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