Miele PDR 910 EL Schéma D'installation page 24

en - Installation notes
The following
should be avoided:
Use:
Calculating the
total ducting
length
24
Exceptions regarding the design of the exhaust air management
system must be designed in accordance with the applicable local
building regulations. Seek approval from the relevant building in-
spector.
- While installing the ducting, keep the tumble dryer disconnected
from the mains power supply.
- Make sure that the plug connections are fully sealed.
- Only use heat-resistant materials with a temperature resistance of
at least 80 °C.
- Condensation will form in the exhaust air management system. A
condensate drain must therefore be placed at the lowest point in
the system.
The opening of the vent ducting (e.g. a wall pipe) must be arranged in
such a way that the humid exhaust air:
- Does not flow back into the room where the tumble dryer is in-
stalled.
- Does cause damage or unacceptable disturbance.
The air required for drying is taken from the room where the dryer is
installed. You must therefore ensure that the room is sufficiently vent-
ilated. Otherwise, there is a risk of suffocation due to exhaust gases
being sucked back from other technical systems or fuel-burning in-
stallations, and the drying time will be much longer.
- Long vent ducting
- Too many tight bends or elbows
This will help to stop a reduced dryer performance and excessive
time and energy requirements.
- For the vent ducting: exhaust hose* or a plastic waste water pipe
(e.g. HT piping systems) with a minimum diameter of 100 mm.
- *optional accessories
The friction of the vent ducting with its bends and various compon-
ents provides resistance to the flow of air. This friction resistance is
expressed as a relative pipe length. The relative pipe length indic-
ates how much greater the resistance of a bend is, for example, when
compared to 1 metre of a straight plastic waste water pipe (table I).
Adding together the relative pipe lengths for all of the components
gives the total ducting length. The total ducting length expresses the
resistance of the entire exhaust air system.
As a larger duct diameter has a lower flow resistance, a longer duct
requires a greater duct diameter (table II).