Lennox LICH4012021T431E-1, Service Manual

Page: 101 / 164

Drainage pipe installation
Installation
99
Indoor unit
More than 50mm
More than 25mm
Plug
Water storage pipe
6.2.7
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
➢
The drainage pipe should be set down inclined after the lifting pipe immediately to avoid wrong
operation of water level switch.
➢
Refer the following picture for installation reference.
Flexible pipe 300mm
Hanger
A
A:Length of horizontal pipe
≤
150mm
B: Lift height
≤
the pump head of water pump
Down incline pipe
B
6.2.8
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 unit of the system should be installed it.
➢
The installation should be considering the convenience for future cleaning.
Blowhole
Plug
Indoor unit
Plug
Indoor unit
6.2.9
The end of drainage pipe shall not contact with ground directly.