Fresh Air Combustion Air Supply - Viessmann VITOLA 200 Installation Instructions Manual

Fresh Air
Combustion Air Supply
Combustion air opening (oil-fired installations)
Install a combustion air opening. Ensure that all code requirements are met.
Minimum round duct diameters are as follows:
Boiler Model
Round duct for combustion air supply
*
These figures are based on a
minimum equivalent duct length of
20 ft/6 m. For equivalent duct lengths
in excess of 20 ft/6 m, up to and
including 50 ft/15 m, increase round
duct diameter by one size.
8
(Continued)
Model No. VB2-18
*
Ø"
General
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" / 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.
VB2-22 VB2-33
5 5 6
VB2-40 VB2-50 VB2-63
7 8 8