Haier AB072MRERA Service Manual page 315

Wash port
Main unit
Thread clip
(accessory)
Sealing washer [for insulation](accessory)
(d) When the laid drain piping is used for multiple equipments,
the public piping should be lower about 100mm than the
wash ports of equipments, as shown in the figure.
Thicker pipes should be used for this application.
(e) The hard PVC tube in the room must be provided with the heat insulating layer.
(f) Don't place the drainpipes at the places where there is irritant gas. Don't put the drainpipe directly into the sewer,
where there might be gases with sulfur.
(g) Backwater bend
Because the drainage was laid in the position of binging subatmospheric pressure easily, gain of elevation of water
in the drain pan conduces leakage water, for avoiding leakage water, design a Backwater bend.
Configuration of Backwater bend can be cleaned, a " T " joint can be used in installing as shown as in the picture
below.
Backwater bend was installed in the neighborhood of air conditioning
A backwater bend was designed in the middle of drain pipe s shown as in the picture below.
Testing Drainage System
(a) After finishing the electrical system, test the drainage system.
(b) During testing, make sure that the water flow passes the piping correctly without any water leakage at the
connection.
(c) In the condition of new house, test the drainage system before fitting up the ceiling.
(d) Even if it is installed in the season needed to heating, the testing should also be performed.
Procedures
(a) Provide about 1000cc of water to the equipment via air outlet port with the feed pump.
(b) During refrigerating operation, check the drainage system..
Wash port
Drainage hose
Sealing washer [for insulation]
(accessory)
Drainage hose
Binding
H1=100mm or blower static pressure
H2= H1(or between 50~100mm)
Joint (purchased at local shop)
hard PVC tube (purchased at locals hop)
Sealing washer [for insulation](accessory)
Ensure the biggest height difference
(about 100mm)
Gradient of 1/100 or over
Indoor unit
307