Airwell AWSI-DCV072-N11 Manuel D'installation page 15

Installation Procedures
7. Cautions in Installation of Air Return Pipe & Exhaust Pipe
It is recommended to use the blast pipes, which
can be anti-condensation and absorb sound.
(purchased at local shops)
Complete the installation of the blast pipes before
fitting up the suspended ceiling.
Heat insulation should be made for the blast
pipes.
The special exhaust port should be arranged at
the place where the air is distributed evenly.
An inspection hole should be left on the surface
of the ceiling for future maintenance.
8. Examples for Bad Installation
The unit is not equipped with the air return pipe and the inner side of the suspending ceiling is
used as the blast pipe, causing the humidity increasing due to irregular air mass, strong wind
or sunlight from the outside world.
There might be condensate dropping down at the outer side of the blast pipe. The humidity is
high, even if the inner side of the suspended ceiling isn't used as a blast pipe in new concrete
buildings. At this time, the whole body should use the thermo wool for heat preservation (the
thermo wool can be packed with a steel wire).
It is operated under the conditions beyond the limits, leading to the overload of the compressor.
Affected by the capacity of the exhaust fan, and the strong wind and wind direction in the outer
flue, when the blowing quantity of the air conditioner exceeds the limits, the drained water of
the heat exchanger will overflow, causing water leakage.
9. Refrigerant Tube
Tubing Permissible Length & Height Difference
Please refer to the attached manual of outdoor units.
Piping Materials & Heat Insulating Materials
As to prevent condensation, heat insulating treatment
should be performed. The heat insulating treatment
for gas and liquid piping should be done respectively.
exhaust fan
example of bad installation
12
special exhaust port
positioning with bolt
air
Piping Hard PVC tube
Material VP31.5mm(inner bore)
Heat Insulating Vesicant polythene
Material thickness: over 7mm
blast pipe
air