Indoor unit
36
_
Ceiling Concealed Duct(High Static)
Indoor Units
10. Installation
10.6 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.
10.7 Use of an auxiliary drain hose(flexible)
a) To connect drain pipe to the drain socket on the indoor unit, an auxiliary flexible drain hose should be
used. auxiliary flexible drain hose allows that the drain pipe can be connected to the socket without break-
ing by excessive strain.
h
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 to check and see if 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 opening facing 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)
