Installation Manual 15
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 necessary,
a flexible drain hose permits the drain socket and drain pipe to be connected without difficulty and pre-
vents any undue strain being placed on the drain pan.
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Important points
- The drain pipe should be at least equal in size to a drain pipe of each 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, pour some water into the drain pan and cheek the drain pump 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 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)
