Mechanical Room; Combustion Air Supply - Viessmann Vitorond 100 VR1 Series Installation And Service Instructions Manual

General Information

Mechanical Room

During the early stages of new home design, we
recommend that proper consideration be given to
constructing a separate mechanical room dedicated to
gas or oil fired equipment including domestic hot water
storage tanks.
The boiler should be located in a heated indoor space,
near a floor drain, and as close as possible to the vertical
chimney or vent.
Install the boiler on a concrete foundation if:
- the floor may be flooded,
- the floor is not level,
- the boiler will be installed in a residential garage (in this
case ensure that the burner is raised at least 18 in.
(457 mm) above the floor to avoid contact with
flammable vapors and fumes).
Viessmann strongly recommends installing the boiler on
a concrete foundation.

Combustion Air Supply

WARNING
Failure to provide an adequate supply of fresh
combustion air can cause poisonous flue gases
to enter living space. Flue gases entering living
space can cause carbon monoxide poisoning which
can result in severe personal injury or loss of life.
WARNING
Never cover the boiler or store debris or other
materials near the boiler, or in any way block the
flow of adequate fresh air to the boiler. Never
cover the combustion air opening.
Advise system operator/ultimate owner accordingly.
WARNING
The boiler must not be located in areas or rooms
where chemicals are stored, or aggressive
vapors (i.e. bleach, hair spray, methyl chloride,
carbon tetrachloride or perchloroethylene) or high
dust levels or humidity levels are present. Heat
exchanger corrosion might occur and reduce the
lifetime of the boiler significantly. If above criteria
are not properly observed and boiler damage
results, any warranty on the complete boiler and
related components will be null and void.
10
Vitorond 100, VR1-22 to -33 Installation and Service
Whenever possible install boiler near an outside wall so
that it is easy to duct fresh air directly to the boiler area.
In addition, do not use exhaust fans in the boiler room
and do not install the boiler in rooms with refrigeration
equipment. This equipment requires uncontaminated
outside air for safe operation - do not install where
chemicals are stored or in a room with negative pressure.
See section entitled "Combustion Air Supply" for further
details regarding the above.
Locate boiler on flooring capable of supporting the weight
of the boiler filled with water. Ensure that the boiler
location does not interfere with the proper circulation
of combustion and ventilation air within the mechanical
room.
General
This equipment requires fresh air for safe operation and
must be installed ensuring provisions for adequate
combustion and ventilation air exist.
Whenever possible, install boiler near an outside wall so
that it is easy to duct fresh air directly to the boiler area.
The boiler location must never be under negative pressure.
Exhaust fans, attic fans, or dryer fans may cause air to be
exhausted at a rate higher than air can enter the structure
for safe combustion.
The heating contractor shall ensure all of the following
requirements are met:
H An adequate supply of combustion air must be available
to ensure proper combustion.
H Ambient air temperatures must be maintained within
safe operating limits.
H When a damper is provided in any opening intended to
admit combustion air into the room within which the
appliance is installed, the damper shall be interlocked to
prevent any burner from starting before the damper is
fully open.
H Each duct used to convey air from the outdoors shall
have:
1. A cross-sectional area throughout its length at least
equal to the free area of the inlet and outlet
openings which it connects,
2. A minimum dimension of 3 in. (76 mm) at any
cross-section,
3. When making provision for outside combustion air,
the intake shall not be less than 1 ft. (0.3 m) above
the anticipated snow level for the location.
H The heating contractor must check with local
authorities (municipal building department, gas utility)
for combustion air requirements particular
to the area.