Haier Smart Power Series Service Manual page 84

Smart Power
(f) The stiff PVC pipe put indoor side should be heat insulated. The height of the drain head can be elevated up to
a point 500 mm above the ceiling, and when an obstacle exists in the ceiling space, elevate the piping to avoid the
obstacle using an elbow or corresponding gadget. When doing this, if the stretch for the needed height is higher
than 500 mm, the back flow quantity of drain at the event of interruption of the operation gets too much and it may
cause overflow at the drain pan. Therefore, make the height of the drain pipe within the distance given in the sketch
below.
(g) Avoid positioning the drain piping outlet at a place where generation of odor may be stimulated. Do not lead the
drain piping direct into a sewer from where sulfur gas may generate.
(h) Because the drain spout is at the position, which negative pressure may occur. So with the rise of water level
in the drain pan, water leakage may occur. In order to prevent water leakage, we designed a backwater bend.
The structure of backwater bend should be able to be cleaned. As the below figure shown, use T type joint. The
backwater bend is set near the air conditioner.
As figure shown, set a backwater bend in the middle of drain hose.
Taking the ADH**H serials as an example, the installation of the drain pipe is the following.
Use general hard polyvinyl chloride (VP25) and connect it with adhesive (polyvinyl chloride) so that there is no
leakage. Do not perform air bleeding.
• Main drain pipe
provide one trap on the main drain pipe near the indoor unit.
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