Haier AB072MRERA Service Manual page 431

(e) The hard PVC tube in the room must be provided with the heat insulating layer.
(f) Water trap:
Because it is easy to cause minus pressure at the water drainage hole, once the water level in drainage pan goes
up, water will leak. To prevent water leakage, we design a water trap here.
Water trap should be easy to be cleaned. Adopt T-shape connector like below figure. It should be near the unit, as
the figure, it is set at the middle of drainage hose.
(g) 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.
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) Charge 1000cc of water to the equipment via air outlet port.
(b) During cooling operation, check the drainage system.
5. Installation of Air Return & Air Exhaust Duct
For the choice and installation of air return port, air return
pipe, air exhaust port and exhaust pipe, please consult
service personnel of Haier company. Calculate the design
chart and exterior static pressure, and select the
exhaust pipe with appropriate length and shapes.
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