Combustion Air Supply To The Heating Room; Ambient Temperature In The Heating Room; Installing The Combustion System - Schmid UTSK-180 Operating Instructions Manual

1 Safety instructions
1.7.1

Combustion air supply to the heating room

Depending on the desired capacity, a certain air flow rate is necessary for wood combus-
tion (combustion air).
The size of the openings is determined during planning in accordance with the valid
local directives (e.g. VKF Directive).
Calculation of the combustion air opening in compliance with VKF:
10.3 x boiler capacity (kW) = free cross-section in cm2
Should forced ventilation (electronically controlled mechanical flaps/fans) be used for
the supply of combustion air, it must be ensured at all times that the required combus-
tion air is available during operation of the system. The valid standards, directives and
regulations such as VKF etc. must be complied with. In addition, it must be ensured
when the boiler has been switched off that combustion air flows into the heating room
for at least 5 hours (systems up to 250 kW) or 10 hours (systems above 250 kW). There
should never be any overpressure (max. +5 Pa in relation to the ambient air pressure) or
underpressure (max. -5 Pa in relation to the ambient air pressure) in the heating room.
Never cover or close the air supply vents in the boiler room under any circumstances.
Doing so will cause the combustion system to operate with an inadequate supply of air.
1.7.2

Ambient temperature in the heating room

The ambient temperature in the heating room of +10°C to max. +35°C must be complied
with.
1.7.3

Installing the combustion system

With regard to the design of the heating room, the respective local building regulations,
the applicable standards and fire regulations as well as the fire protection regulations
are decisive. It is not permitted to place the combustion system on a wooden floor or
combustible surface. Observe the respective regulations regarding fire protection as
well as the valid regulations on accident protection and accident prevention. Ensure
sufficient lighting at the installation site.
D-12
Underfeed grate UTSK
1.10 en