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Indoor Unit Drain Pipe Work
3) Ground drain piping
a) It is standard work practice to make connections to the main pipe from above. The pipe down from the
combination should be as large as possible.
b) The pipe work should be kept as short as possible and he number of indoor units per group kept to a
minimum.
4) Use of an auxiliary drain hose(flexible)
a) It the drain pan made of polystyrene foam is used then an auxiliary drain hose(flexible) is also essential a
flexible drain hose permits the drain socket and drain pipe to be connected without difficulty and prevents
any undue strain being placed on he drain pan.
Metal clamp
Drain pan
Important points
- The drain pipe should be at least equal in size to that of the indoor unit.
- The drain pipe is thermally insulated to prevent the formation of condensation inside the pipe.
- The drain up mechanism should be fitted before the indoor unit is installed and when the electricity has
been connected some water should be added to the drain pan and the drain pump check to see that it is
functioning correctly.
- Al connections should be secure. (Special care is needed with PVC pipe)
Common Installation Process
78
Face piping
downward
Auxiliary drain hose
Metal clamp
Thermal insulation(bend area)
Face the vent pipe mouth downward to keep
foreign matter from penetrating he system
Vent pipe
Thermal insulation (drain pipe area)
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