Aisin AWGP180E1NHS, Installation Instructions Manual

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38
6.
Drain Piping Installation
1) Exhaust Water Drain Piping Installation
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Condensation water from the exhaust gas comes out of the exhaust water drain hose of the outdoor unit. Con-
nect the exhaust water drain hose to the drain piping as below.
Warning
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Never connect the exhaust drain and the indoor unit condensation line together.
If exhaust gas flows into the building, it could cause gas poisoning or an accident due to lack
of oxygen.
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Arrange the piping so that the exhaust gas in the exhaust drain will be released to the
atmosphere in the following cases.
a) If, exhaust drain hose of outdoor unit were connected to the catch basin or ditch
with a lid.
b) If, exhaust drain water of outdoor unit were released to the same location as indoor
unit condensation drainage.
If the exhaust gas is not released into the atmosphere, gas poisoning or an accident due to
lack of oxygen could occur.
Caution
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When installing an outdoor unit on a rooftop, make sure to route the exhaust drain water
into a gutter, not through the rooftop surface.
Failure to do so may experience a stain or material damage on the rooftop surface.
Important reminder
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Extend the exhaust water drain piping to the appropriate outlet as shown on the following page,
because condensation water from the exhaust gas comes out of the exhaust water drain hose of
the outdoor unit.
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Always provide downward gradient for the drain piping. Otherwise, the exhaust drain water will
accumulate in the piping and damage the unit.
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Take care not to clog up the end of the exhaust water drain hose when inserting the hose to the
exhaust water drain pipe. Otherwise, the exhaust drain water will accumulate in the hose and
damage the unit.
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When the drain piping is a combined piping, provide openings (breathers) upstream of the con-
necting points of the pipes to avoid back pressure.