Installation instructions S-HR series page 11
4.7 Flue gas exhaust system and air
supply system
The unit connection diameter is Ø 80 mm. to which the
flue gas discharge and air supply system can be fitted
with or without bends.
The maximum usable pipe length is stated in table 5.
It is advisable to use stainless steel discharge
equipment for the flue gas discharge. By using the
STREBEL icicle-free trough the roof kit, ice-forming
around the flue terminal is prevented. For the air supply
plastic can be chosen. If a plastic discharge system is
installed the unit has to be equipped with a flue gas
thermostat. This flue gas thermostat is available from
STREBEL LTD.
With the flue gas discharge system and air supply
system the following is meant:
- the flue gas discharge pipe;
- the air supply pipe;
- through the roof kit or wall terminal.
The flue gas exhaust and the air supply installation must
be installed in accordance with British Standards.
The exhaust system should always be installed sloping
towards (30 mm/m) the unit, in order for condensation
water not to gather in the exhaust system. With
condensation water flowing back to the apparatus the
chance of ice forming on the trough the roof kit is
minimal. In case of horizontal outlets the supply system
has to be installed sloping outside in order to prevent
rain coming in.
It is superfluous to install an extra condensation
collecting unit.
In operation, the unit produces a white
condensation plume. This condensation
plume is harmless but can be experienced as
disturbing especially in the case of outlets in
the wall. For this reason it is advisable to exit
at roof level.
The apparatus is not suitable as an open
unit. This means that the combustion air
always has to be brought from outside.
Where the unit is installed in a compartment,
ventilation is required as per BS 5440.
For further information regarding the supply range of the
exhaust and supply system please contact STREBEL
LTD.
supply and exhaust system
figure 9
length supply and exhaust system
table 5
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