Haier AU282AHBEA Service Manual page 161

(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
During the trial, make sure that drain flows properly through the piping and that
2
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
2 Check the drain while cooling operation.
6. Installation of air suction and discharging duct
muffler cavity (air sending)
Insulation
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.
The length difference among every duct is limited below 2:1.
Reduce the length of duct as possible as can.
Reduce the amount of bend as possible as can.
Use heat insulation material to bind and seal the part connecting main unit and the flare part of air
discharging duct. Perform duct installation work, before the ceiling fit.
Bad example
H1=100mm or the static pressure of air sending motor
H2=1/2H1 (or between 50~100mm)
Sacking joint
A
Air conditioner
Air outlet
main unit
Air suction grille with air filter
Checking meatus
Bad example
>a__WcU[S^ <[c >a`V[e[a`Wc
A downhill grade of
1/100 or more
Enlarging chart of
profile chart A
Vibration resistance hook
Air volume adjuster
Ceiling
Good example
-161-
Secure the elevation as high as possible
(approx. 100 mm)
VP 30