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Centralized Drainage
Without the drain pump
1. Install horizontal drainpipe with a slope of 1/100 or more and fix it by hanger space of 1.0~1.5m.
2. Install U-trap at the end of the drainpipe to prevent a nasty smell to reach the indoor unit.
Horizontal drainpipe more
Ceiling
than 1/100 slope
With the drain pump
1. Install main air vent at the front of the farthest indoor unit from the main drain when installed indoor units are
more than 3.
2. You may need to install individual air vent to prevent water flow back at the top of each indoor unit drainpipe.
1~1.5m
Hanger
Main air vent
Individual
air vent
550mm
or less
Centralized horizontal drainpipe
Main drainpipe
(more than 1/100 slope)
29
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