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General installation information
Design
Prior to installation, check that the max-
imum possible pipe length will not be
exceeded.
Max. possible pipe lengths in relation to
the boiler used:
Flue gas temperature protection
The flue pipes are approved for flue
gas temperatures up to 120 °C.
Installation information
■ The component overviews for the dif-
ferent types of routing also apply to
floorstanding condensing boilers.
■ Keep flue gas routes short and with
the fewest number of bends possible.
■ Route horizontal connection pipes
with a fall of ≥ 3° (approx. 50 mm/m)
towards the boiler.
■ Support horizontal connection pipes
at intervals of approx. 1 m.
■ To avoid damage and leaks, isolate
the flue system from sources of vibra-
tion (e.g. ventilation systems).
■ Check the gaskets in all female con-
nections are correctly seated.
■ Prior to installation, lubricate all gas-
kets with the lubricating paste provi-
ded.
■ Only use the special gaskets sup-
plied with the boiler.
■ Female plug-in connections in the
flue gas path must always point in the
direction of flow.
■ Only use the components supplied
with the Viessmann flue system.
4
Flue systems technical guide
With Viessmann condensing boilers,
internal safeguards ensure that the
maximum permissible flue gas temper-
ature is not exceeded.
■ Push the pipes into each other with a
slight twist.
■ Balanced flue pipes can be trimmed
in their assembled state.
Do not carry out commissioning until
the following conditions are met:
■ Free passage through the flue gas
pipes.
■ Flue system with positive pressure is
gas-tight.
■ Apertures for ensuring sufficient com-
bustion air supply are open and can-
not be closed off.
■ Applicable regulations on installing
and commissioning flue systems
have been followed.
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