6.5.5
Specific air and flue gas applications
Important
If the boiler is used in a flue gas overpressure cascade, this must
be stated on the sticker supplied: This central heating unit is set
for... This sticker must be affixed on top of the boiler next to the
type plate.
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6.5.6
Additional guidelines
For installing the flue gas outlet and air supply materials, refer to the in
structions of the manufacturer of the relevant material. If the flue gas
outlet and air supply materials are not installed in accordance with the
instructions (e.g. not leakproof, not properly bracketed), this can result in
dangerous situations and/or physical injury. After installation, check at
least all flue gas outlet and air supply parts for tightness.
Direct connection of the flue gas outlet to structural ducts is not permit
ted because of condensation.
Always clean shafts thoroughly when using lining pipes and/or an air
supply connection.
It must be possible to inspect the lining duct.
If condensate from a plastic or stainless steel pipe section can flow back
to an aluminium part in the flue gas outlet, this condensate must be dis
charged via a collector before it reaches the aluminium.
With longer lengths of aluminium flue gas outlet pipes, relatively large
quantities of corrosion products flowing back out of the outlet pipes to
gether with the condensate must be taken into account the first time.
Clean the siphon of the appliance regularly or install an extra conden
sate collector above the unit.
Make sure that the flue gas outlet pipe towards the boiler has a sufficient
gradient (at least 50 mm per metre) and that there is a sufficient conden
sate collector and discharge (at least 1 m before the outlet of the boiler).
The bends used must be larger than 90° to guarantee the gradient and a
good seal on the lip rings.
Important
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6.5.7
Connecting the flue gas outlet and air supply
S insertion depth 50 mm
1. Fit the flue gas outlet pipe to the boiler.
2. Fit the subsequent flue gas outlet pipes and air supply pipes in ac
cordance with the manufacturer's instructions.
Caution
The pipes must be flue gas-tight and corrosion-resistant.
The flue gas outlet pipe must be smooth and deburred.
Connect the pipes so that they are stress-free.
The pipes must not rest on the boiler.
Fit the horizontal parts sloping down towards the boiler, with a
slope of 50 mm per metre.
Fig.19
Connecting the flue gas outlet and
air supply
AD-0000221-01
Ø100/150 mm
S
6 Installation
7625116 - v.04 - 17012017
31
