Carrier ROOM AIR CONDITIONER Installation Manual page 15

INSTALLATION INSTRUCTIONS
(3) Water storage pipe setting
If the indoor unit has high extra static pressure and without water pump to elevate the
condensate water, such as high extra static pressure duct unit, the water storage pipe
should be set to avoid converse flow or blow water phenomena.
Indoor unit
Plug
Water storage pipe
(4) Lifting pipe setting of indoor unit with water pump
The length of lifting pipe should not exceed the pump head of indoor unit water pump.
Pump head of big four way cassette:750mm.
Pump head of compact four way cassette: 500mm(9k, 12k, 18k units).
The drainage pipe should be set down inclined after the lifting pipe immediately to avoid
wrong operation of water level swithch.
Refer the following picture for installation reference.
B
Flexible pipe
(5) Blowhole setting
For the concentrated drainage pipe system, there should design a blowhole at the highest
point of main pipe to ensure the condensate water discharge smoothly.
The air outlet shall face down to prevent dirt entering pipe.
Each indoor system should be installed it.
The installation should be considering the convenience for future cleaning.
Indoor unit
Plug
Fig.31
Hanger
Down incline pipe
A:Length of horizontal pipe ≤ 150mm
B: Lift height ≤ the pump head of water pump
300mm
Fig.32
Blowhole
Indoor unit
More than 50mm
More than 25mm
Plug
Fig.33
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