Insulate the pipe clamp and the drain hose
using heat insulation sponge.
①. Metal clamp (accessory)
②. Insulation sponge (accessory)
(3) When unifying multiple drain pipes, install the pipes as Figure 3-1-38. Select converging drain
pipes whose gauge is suitable for the operating capacity of the unit.(take the cassette type unit
for example)
Figure 3-1-38
(4) When the drain hose cannot keep a sufficient gradient, it is necessary to fit a riser pipe (field
supplied) to it.
(5) If the air flow of indoor unit is high, this might cause negative pressure and result in return
suction of outdoor air. Therefore, U-type water trap shall be designed on the drainage side of
each indoor unit. (Figure 3-1-39)
(6) Install one water trap for each unit.
(7) Installation of water trap shall consider easy cleaning in the future.
Figure 3-1-39 Figure 3-1-40 Figure 3-1-41
(8) Connection of drainage branch pipe to the standpipe or horizontal pipe of drainage main pipe
The horizontal pipe cannot be connected to the vertical pipe at a same height. It can be connected
in a manner as shown below:
NO.1: Attach the 3-way connection of the drainage pipe joint as shown in Figure 3-1-42.
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