0020308118_05 Installation and maintenance instructions 5
▶ Do not use naked flames (e.g. lighters,
matches).
▶ Do not smoke.
▶ Do not use any electrical switches, mains
plugs, doorbells, telephones or other com-
munication systems in the building.
▶ Close the emergency control valve or the
main isolator.
▶ If possible, close the gas stopcock on the
product.
▶ Warn other occupants in the building by
yelling or banging on doors or walls.
▶ Leave the building immediately and ensure
that others do not enter the building.
▶ Alert the police and fire brigade, and in-
form the emergency service department of
the gas supply company as soon as you
are outside the building.
1.3.2 Liquefied petroleum gas
There is a risk that liquefied petroleum gas
may collect in the lower part of multi-configur-
ation air/flue systems at floor level.
If the product is installed below ground level,
liquefied petroleum gas may accumulate at
floor level if there are any leaks.
To prevent explosions and fire:
▶ Do not use liquefied petroleum gas to op-
erate the heat generator for a multi-config-
uration air/flue system operating at excess
pressure.
▶ Make sure that liquefied petroleum gas
cannot escape from the product or the gas
pipe under any circumstances.
To prevent ignition problems when the lique-
fied petroleum gas tank is poorly ventilated:
▶ Ensure that the liquid gas tank has been
purged properly before installing the
product.
▶ If required, contact the filler or the liquid
gas supplier.
1.3.3 Flue gas
Flue gases may cause poisoning, while hot
flue gases may also cause burns. Flue gases
must therefore never be allowed to escape
uncontrollably.
What to do if you smell flue gas in the prop-
erty:
▶ Open all accessible doors and windows
fully to provide ventilation.
▶ Switch off the product.
▶ Check the flue gas routes in the product
and the flue gas diversions.
To prevent flue gas exit:
▶ Only operate the product if the air/flue pipe
has been completely installed.
▶ With the exception of short periods for
testing purposes, only operate the product
when the front casing is installed and
closed.
▶ In order to operate the product, ensure that
the condensate siphon is always full.
– Water seal level for units with condens-
ate siphon (third-party accessory):
≥ 200 mm
To ensure that the seals are not damaged:
▶ Instead of grease, use only water or com-
mercially available soft soap to aid installa-
tion.
1.3.4 Air supply
Unsuitable or insufficient combustion and
room air may lead to material damage, but
also to life-threatening situations.
▶ Use the data plate, to check the unit types
(air/flue gas) for which the product is ap-
proved:
– Unit type B = open-flued combustion
air supply
– Unit type C = room-sealed combustion
air supply
▶ If the product has the approval for unit type
B and you want to operate the product as
open-flued, ensure that the air supply to
the product's installation room is perman-
ently unobstructed and sufficient in accord-
ance with the relevant ventilation require-
ments. This also applies, in particular, for
cupboard installations.
To prevent corrosion on the product and in
the flue system:
▶ Ensure that the combustion air supply is
free from sprays, solvents, chlorinated
cleaning agents, paint, adhesives, am-
monia compounds, dust or similar sub-
stances.
▶ Ensure that no chemical substances are
stored at the installation site.
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