Installation Manual
17
Installation
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.
4) Use of an auxiliary drain hose(flexible)
a) If 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.
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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 so that the drain pump checks to see that it
is functioning correctly.
- All connections should be secure. (Special care is needed with PVC pipe)
- Insulate auxiliary drain hose with thermal insulation band.
b) The pipe work should be kept as short as possible and the number of indoor units per group be kept to a
minimum.
Face piping
downward
Vent pipe
Face the vent pipe mouth downward to keep
foreign matter from penetrating the system
Metal clamp
Drain pan
Metal clamp
Thermal insulation(bend area)
Auxiliary drain hose
Thermal insulation (drain pipe area)
