Haier HBU-18CF03 Service Manual page 29

(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
4 Be sure to conduct this test even when the unit is installed in the heating season.
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.
5.2.2.4 Installation of air suction and discharging duct
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.
29
Commercial Air Conditioner
H1=100mm or the static pressure of air sending motor
H2=1/2H1 (or between 50~100mm)
muffler cavity (air sending)
Sacking joint
A
Air conditioner
Air outlet
main unit
Checking meatus
Secure the elevation as high as possible
(approx. 100 mm)
A downhill grade of
1/100 or more
Air volume adjuster
Ceiling
Air suction grille with air filter
Model: HBU-18CF03
HDU-42CF03/H HPU-42HF03
VP 30
Enlarging chart of
profile chart A
Vibration resistance hook