Barometric Draft Regulator Type; Barometric Draft Regulator Diameter; Venting Option #2 (Category Iii); Combustion Air Supply - Viessmann Vitorond 200 VD2 Series Technical Data Manual

Standard Equipment
System Design Considerations

Barometric draft regulator type

For natural gas or propane applications, use a double-
acting type.
For #2 fuel oil applications, use a single-acting type.

Barometric draft regulator diameter

The barometric draft regulator must be the same diameter
opening as the chimney for which the vent is sized.
For example, a 14 in. (356 mm) chimney would require
a 14 in. barometric draft regulator. Do not size the
barometric draft regulator to the breeching outlet of the
boiler, unless the chimney is also intended to be of that
diameter.
IMPORTANT
The size of the flue gas outlet on the boiler does not
automatically determine the horizontal breeching,
or the actual chimney diameter. The chimney size must
be designed for the actual boiler model and its input.

Venting option #2 (Category III)

The Vitorond 200 boiler is a Category III positive pressure
non-condensing boiler.
Each boiler must be vented individually.
The vent system must be properly designed and suitable
materials must be selected. The chimney must be gas
tight.
Barometric draft regulator
16
Vitorond 200, VD2 Series 320 to 1080 Technical Data
(continued)

Combustion air supply

The boiler must not be located in areas or rooms where
chemicals containing chlorine, bromine, fluorine,
or other corrosive chemicals are stored. Examples include
refrigerants, bleach, paint, paint thinner, hair spray,
cleaning solvents, water softener salt, etc.
The combustion air must not be contaminated with any
amount of the above mentioned chemicals.
Boiler should never be installed in areas where excessive
dust, high humidity, or risk of frost exist. Ensure adequate
ventilation and supply of fresh combustion air.
Consult Viessmann with uncertainties in regard
to a suitable boiler installation location.
This boiler/burner unit needs clean fresh air for safe
operation. Provisions for combustion and ventilation
air must be made at time of installation. For oil-fired
boilers, use the "Installation Code for Oil Burning
Equipment CAN/CSA-B139" (Canada), or NFPA 31 (USA).
For gas or propane installations, use the "Natural Gas
Installation Code CAN/CSA-B149.1 or B149.2" (Canada),
or "National Fuel Gas Code ANSI Z223.1" (USA), and/or
provisions of local codes.
The sizing methods outlined in the above codes should
be used when installing a round duct to supply
combustion air from the outside.

Warranty

Our warranty does not cover damages resulting from
the following:
- Corrosion caused by flue gas condensation due
to low boiler water and/or return water temperatures.
- Operation with contaminated fill and supplementary
feed water.

System layout

The boiler water temperature limit is factory set to 167°F
(75°C).
The boiler water temperature limit can be increased by
altering the adjustable high limit to increase the supply
water temperature.
To minimize piping losses of the system, however,
Viessmann recommends that the radiation and domestic
hot water production in the system be designed for
a 158°F (70°C) boiler supply water temperature.