Safety Precautions; Minimum Clearances - Viessmann VITOFLEX 300-UF Technical Manual

Design information
Never close or obstruct combustion air apertures or pipes. Use spe-
cial safety measures to ensure that the combustion equipment can
only be operated when the aperture is open.

Safety precautions

For gas combustion equipment installed in rooms, fuel lines must be
equipped with the following safety equipment immediately upstream
of the gas combustion equipment:
■ In the event of an external thermal load in excess of 100 °C, the
fuel supply must automatically shut off.
■ Up to a temperature of 650 °C and over a period of at least 30 min,
no more than 30 l/h (measured as air flow rate) must be able to
flow through or out of the fuel line.
Combustion equipment must be installed at a sufficient distance
from combustible materials and fitted furniture, or be shielded from
them, to ensure that the temperature on such materials/furniture
does not exceed 85 °C when the combustion equipment is delivering
the rated heating output.

Minimum clearances

> a
VITOFLEX 300-UF
(cont.)
The required cross-section must be free.
Room ventilation
Note
Means for adequate ventilation of the boiler room must be provided
with all automatic heating systems.
> 880
Viesmann
87
9