Multi Variable Air Conditioners Ducted Type Indoor Unit 
10 
4.3 Drainage Pipe Installation and Drainage System Testing 
4.3.1 Notice for Installation of Drain Pipe 
(1)  It is not allowed to connect the condensate drain pipe into waste pipe or other pipelines which 
are likely to produce corrosive or peculiar smell to prevent the smell from entering indoors or 
corrupt the unit. 
(2)  It is not allowed to connect the condensate drain pipe into rain pipe to prevent rain water from 
pouring in and cause property loss or personal injury. 
(3)  Condensate drain pipe should be connected into special drain system for air conditioner. 
(4)  The drainage pipe should be short and the gradient downwards should be at least 1%~2% 
in order to drain condensation water smoothly. 
(5)  The diameter of drainage hose should be bigger or equal to the diameter of drainage pipe 
joint. 
(6)  Install drainage pipe according to the following fig and arrange insulation to the drainage pipe. 
Improper installation may lead to water leakage and damp the furniture and other things in 
the room. 
(7)  You can buy normal hard PVC pipe used as the drainage pipe. During connection, insert the 
end of PVC pipe into the drainage hole and then tighten it with drainage hole and wire binder. 
Can’t connect the drainage hole and drainage hole with glue. 
(8)  When the drainage pipelines are used for several units, the position of pipeline should be 
about 100mm lower than the drainage port of each unit. In this case, thicker pipes should be 
applied. 
 
Fig.4.3.1 
4.3.2 Drainage Pipe Installation 
(1)  Insert the drain hose into the drain hole and tighten it with tapes, as shown in Fig.4.3.2. Model 
with water pump will be provided with drain hose, while other models please prepare the 
drain hose by yourself. 
(2)  Tighten the pipe clamp, with the distance between screw nut and hose smaller than 4mm. 
    
Fig.4.3.2