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Multi Variable Air Conditioners Ducted Type Indoor Unit
(8) Drain pipes should have a downward slope of at least 1%~2%, in order to prevent pipes
from sagging, install hanger bracket at intervals of 1000~1500 mm (39-3/8~59 in.).
4.3.3 Test of Drainage System
(1) Please test drainage system after electric work is finished.
1) Inject approximately 1L purified water to drain pan from air vent, ensure that not to
splash the water over the electrical components (e.g. water pump. etc).
2) In case of commissioning finished, please energize the IDUs and switch to cooling or
dry mode, meanwhile, the water pump operates, you can check the draining through
the drain socket.
3) If communication wire is not connected, communication malfunction "C0" will occur
after 60s of energizing. In this case, the water pump operates automatically. Check if
the water pump drains normally through drainage port. The water pump will stop
automatically after running for 10mins.
(2) During the test, please carefully check the drainage joint, make sure no any leakage
occur.
(3) It is strongly recommend to do the drain test before ceiling decoration.
4.4 Installation of Air Duct
NOTICE!
① There should be insulating layer on air-out duct, air-return duct and fresh air duct to
avoid heat loss and moisture. Adhere a nail on the air duct and then add thermal
sponge with a layer of tin. Fasten it with a nail cover and then seal the junction with tin
tapes. You can also use other materials that have good insulation quality.
② Each air-out duct and air-return duct should be fixed on a pre-made board with iron
frame. The junction of air duct should be well-sealed in order to prevent air leakage.
③ The design and construction of air duct should comply with national requirements.
④ The edge of air-return duct is suggested to be more than 150mm(5-7/8 in.) away from
the wall. Add a filter to the air-return opening.
Fig 4.3.10
Fig 4.3.11
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