MULTI VRF-Ⅱ INDOOR UNIT SERVICE MANUAL EUROPEAN/LATIN AMETICA (R410A)
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4 Installation of drain pipe
4.1 Precautions When Doing the Piping Work
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Keep piping as short as possible and slope it downwards at a gradient of at least 1/100 so that air may
not remain trapped inside the pipe.
For example:
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Keep pipe size equal to or greater than that of the connecting pipe.
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Install the drain piping as shown and take measures against condensation. Improperly rigged piping
could lead to leaks and eventually wet furniture and belongings.
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When directly connecting a hard vinyl chloride pipe joint to the drain hose connected to the indoor unit,
use a commercially available hard vinyl chloride pipe joint (nominal diameter 13mm).
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Drain hose connectedto the indoor unitCommercially availablehard vinyl chloride pipejoint (nominal
diameter 13mm)Commercially availablehard vinyl chloride pipe(nominal diameter 13mm)
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Do not connect the drain piping directly to sewage pipes that smell of ammonia. The ammonia in the
sewage might enter the indoor unit through the drain pipes and corrode the heat exchanger.
4.2 Installing the Drain Pipes
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Insert the drain hose into the drain outlet, and tighten the clamp securely with tape.
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Tighten the clamp until the screw head is less then 4 mm from the hose.
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Insulate the pipe clamp and the drain hose using heat insulation sponge.
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