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4.3.2. Pipe connection
• The gas and liquid pipes connections must be brazed.
• Be sure to braze them before performing any wiring work or installing the drain pipe.
Connection Pipe (Liquid pipe)
Connection Pipe (Gas pipe)
Control Box
Maintenance Panel
Be sure to use wet cloth, etc., to protect the pipe rubber, pipe heat insulation, and
the heat insulation of the safety drain pan as shown below. Because these parts are
extremely fl ammable, they can cause a fi re if they are not properly protected.
The heat exchanger contains a thermistor.
Do not expose the thermistor to the fl ame.
Completely cover the pipe rubber
and pipe heat insulation with wet
cloth, etc., to prevent them from
burning.
Do not expose the unit (control box, rear panel, maintenance panel, etc.) and the inlet
grille to the fl ame. The exposure of these parts to the fl ame will adversely affect their
appearance and functions or cause a fi re.
En-5
Outer diameter of pipe
1/2 in (12.7 mm)
7/8 in (22.22 mm)
Rear Panel
Connection Pipe
(Gas pipe)
Connection Pipe
(Liquid pipe)
WARNING
Protect these areas with wet cloth, etc.
Pipe heat insulation
Pipe rubber
Brazing
Pipe rubber
Pipe heat insulation
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
brazing the pipes. Nitrogen
gas pressure:
2.9 psi (0.02 MPa)
(= pressure felt suffi ciently on
the back of your hand)
If a pipe is brazed without applying nitrogen gas, it will create an oxidation fi lm.
This can degrade performance or damage the parts in the unit (such as the
compressor or valves).
Do not use fl ux to braze pipes. If the fl ux is the chlorine type, it will cause the pipes to
corrode. Furthermore, if the fl ux contains fl uoride, 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 fl ux.
4.4. 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.
Cable tie (Large)
No gap
(Accessories)
insulation (Large)
No gap
insulation (Small)
Cable tie (Large)
(Accessories)
5. INSTALLING DRAIN PIPES
• Use general hard polyvinyl chloride pipe (VP25) 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
Safety drain port
CAUTION
Pressure regulating valve
Cap
Nitrogen gas
Brazing area
Coupler heat
(Accessories)
Coupler heat
(Accessories)
7-7/8 in (200 mm)
16-13/16 in
(427 mm)
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