Fitting
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67
6 720 807 794 (2013/04)
UNIMAT
10.2
Design of installation rooms and
combustion air supply
10.2.1
Installation location
General information
The requirements of the installation room or building
contain information for the installation of boilers and
boiler house components for heating systems. They are
to be used to assist engineers of installation rooms and
buildings. All relevant national and local regulations and
applicable standards must be observed.
Fundamental requirements
The following fundamental requirements of the
installation room must be fulfilled:
• Only install the boiler system in a room that complies
with relevant local regulations.
• Keep the installation room clean and free of dust and
dripping water. The room temperature must be
between 5 °C and 40 °C.
• The service intervals for the boiler system may be
reduced if the air at the site contains salt (coastal
areas).
• Entry to the boiler installation room must be
forbidden to unauthorised personnel by noticeable,
permanent signs.
• Depending on the boiler parameters (water capacity,
pressure, output) and national regulations, less
stringent installation or monitoring conditions may
apply.
• Ensure sound insulation measures comply with local
regulations.
• Install the control panels in such a way that no
vibrations or shaking of the system components can
be transmitted to the control panels. Install in areas
where the control panels will be protected from
impermissible heat radiation and ensure safe
accessibility even in potentially dangerous
circumstances.
• Free access to inspection apertures on boilers and
system components must be ensured.
Requirements of the building
The following requirements of the building must be
fulfilled:
• The installation location must be constructed in such
a way that vibrations as a result of operation cannot
cause any damage to buildings or adjacent systems.
• The static of the building structure must be taken into
account for all fixings.
• Every boiler installation room must have a continuous
or nearly continuous, free external wall or ceiling area
of at least 1/10 the floor area (or as per local
regulations), that will yield much more easily than the
other surrounding walls if overpressure occurs in the
boiler installation room.
• Design the entrance to the boiler installation room
according to the dimensions of the individual
components.
• Provide suitable lifting gear in the boiler installation
room to move heavy equipment.
• The internal height and width of all walk-on surfaces
must be sufficient. Access to the system must be
ensured in line with local regulations. If the internal
height of the installation room is lower than required
for structural reasons, determine the minimum height
together with the local responsible authorities.
• Suitable and designated escape routes must be
available.
• The boiler installation room, especially around the
valves and safety equipment, as well as the escape
routes, must be illuminated.
• System components that are to be operated must be
easily accessible and there must be enough space to
open doors (including inspection apertures).
10.2.2
Combustion air supply
The design of installation rooms and the installation of
boilers must comply with the relevant national
regulations.
Fundamental requirements
• Combustion air apertures and lines must never be
closed or covered unless there is special safety
equipment that ensures the combustion equipment
can only be operated if the flow cross-section is
unobstructed.
• The required cross-section must not be restricted by
a closure or grille.
• An adequate supply of combustion air must be
verified.
• The ventilation air supply to the combustion
equipment should come from the boiler installation
room to compensate for outside temperature
fluctuations. The maximum temperature fluctuation
must not exceed 30 K.
• Combustion air temperature:
– Minimum: + 5 °C
or as specified by burner manufacturer
– Maximum: + 40 °C
or as specified by burner manufacturer
Arrangement of ventilation and extract air apertures
• Ideally, ventilation air apertures are arranged near the
back of the boiler. If this is not possible for structural
reasons, install air baffles or sheet metal channels
inside the boiler installation room to deflect the inlet
air.
• When designing the ventilation air apertures, the
arrangement of frost-sensitive system components
must also be taken into account (e.g. water
treatment) if they cannot be installed in the direct
path of the ventilation air.
• Furthermore, install the ventilation air apertures in
the boiler installation room in such a way that the
ventilation air does not flow over boiler doors or
reversing chambers (to prevent condensation).
• Extract air apertures should also be provided.
• Ventilation air apertures should be fitted 500 mm
above the boiler room floor; extract air apertures
should be fitted at the highest point of the installation
room.
Ensure cross venting.
