Fisher FSKIF-121AE2-EU Service Manual page 112

Drainage pipe installation
6.2.3 Individual design of drainage pipe system
 The drainage pipe of air conditioner shall be installed separately with other sewage pipe, rainwater pipe
and drainage pipe in building.
 The drainage pipe of the indoor unit with water pump should be apart from the one without water pump.
6.2.4 Supporter gap of drainage pipe
 In general, the supporter gap of the drainage pipe horizontal pipe and vertical pipe is respectively
1m~1.5m and 1.5m~2.0m.
Each vertical pipe shall be equipped with not less than two hangers.

 Overlarge hanger gap for horizontal pipe shall create bending, thus leading to air block.
6.2.5 The horizontal pipe layout should avoid converse flow or bad flow
Drainage pipe
Water flow
Drain tee
Branch pipe
Keep a certain degree
 The correct installation will not cause converse water flow and the slope of the branch pipes can be
adjusted freely
 The false installation will cause converse water flow and the slope of the branch pipe can not be
adjusted.
6.2.6 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.
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Water flow
Water flow
Water flow
Too long distance
Gas bag
Drainage pipe
Water flow
Drain tee
Water flow
Water flow
Gas
Water flow
Main pipe
Branch pipe
Drainage pipe Drain tee
Water flow
Water flow
Water flow
Gas
Main pipe
Installation