Haier AU282AHBEA Service Manual page 168

(b)
When connecting the drain pipe to unit, pay suffcient attention not to apply excess force to the piping on the unit side.
Also, fix the piping at a point as close as possible to the unit.
(c) For drain pipe, use hard PVC general purpose pipe VP-25(I.D.1") which can be purchased locally. When connecting,
insert a PVC pipe end securely into the drain socket before tightening securely using the attached drain hose and
clamp. Adhesive must not be used connection of the drain socket and drain hose (accessory).
(d) When constructing drain piping for several units,
position the common pipe about 100 mm below
the drain outlet of each unit as shown in the sketch.
Use VP-30(11/4") or thicker pipe for this purpose.
(e) The stiff PVC pipe put indoor side should be
heat insulated.
(f) Avoid putting the outlet of drain hose in the places with irritant gas generated. Do not insert the drain hose directly
into drainage,where the gas with sulfur may be generated.
(g)
Backwater bend
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.
Drainage Test
Conduct a drainage test after completion of the electrical work.
1
2 During the trial, make sure that drain flows properly through the piping and that no water leaks from connections.
In case of a new building, conduct the test before it is furnished with the ceiling.
3
Be sure to conduct this test even when the unit is installed in the heating season.
4
Procedures
Supply about 1000 cc of water to the unit through the air outlet using a feed water pump.
1
Check the drain while cooling operation.
2
6. Installation of air suction and discharging duct
Please consult the after-sales service worker of Haier Air Conditioner for the choosing and installation of suction inlet,
suction duct, discharging outlet and discharging duct. Calculating the design drawing and outer static pressure, and
choose the discharging duct with proper length and shape.
Stage
difference
part
Drain socket
Drain socket
Pipe cover(large)
[for insulation]
(accessory)
Main unit
Drain hose
(accessory)
Clamp
(accessory)
Pipe cover(small)
[for insulation]
(accessory)
H1=100mm or the static pressure of air sending motor
H2=1/2H1 (or between 50~100mm)
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Drain hose
VP 25 joint
(field purchased)
VP 25
(field purchased)
Adhesion
Pipe cover
[for insulation]
(field purchased)
A downhill grade of
1/100 or more
-168-
Secure the elevation as high as possible
(approx. 100 mm)
VP 30