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5583 772 - 03
Vitorond 100, VR1 Technical Data Installation
System Design Considerations
Chimney
For proper operation of the Vitorond boiler, all products of
combustion must be safely vented to the outdoors, while
ensuring that flue gases do not cool prematurely.
It is critical that the chimney system be properly designed
to handle the flue gas temperatures which the Vitorond
boiler produces.
Flue gases which cool too quickly and produce
condensation lead to damages if the chimney diameter is
too large and the chimney system is not well insulated.
If a calculated chimney diameter lies between two
values, the larger diameter should be selected.
Intermediate section
The intermediate (vertical and horizontal) section of
venting between the boiler vent pipe collar and the
chimney must be of the identical diameter as the vent
connection of the boiler. Use the shortest possible path
between the boiler and the chimney. A maximum of two
elbows may be installed in the intermediate section.
Avoid the use of two level 90° elbows.
The intermediate section must be sealed pressure tight at
the boiler vent pipe collar and at the chimney connection.
Ensure any test port for combustion values is sealed as well.
The chimney connection length between the boiler
vent pipe collar and the chimney may be installed with
insulation. We recommend consulting a reputable chimney
installer for advice in project-specific circumstances.
Barometric damper must be used!
Note: Direct Vent exhaust system operates under a
positive pressure developed by the burner. Make
sure all vent connections and observation ports on
the boiler are sealed air tight by tightening screws
and using high temperature silicone sealant if
necessary.
The vent components must be supplied without any
alteration except for the length of the flex pipe which
can be cut to the desired length.
Warranty
Our warranty does not cover damages resulting from the
following:
– installation or service by unqualified and not licensed
personnel
– corrosion caused by flue gas condensation due to low
boiler water and/or return water temperatures
– operation with contaminated fill and supplementary
feed water
For detailed warranty information, please read warranty
sheet supplied with product.
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
the above mentioned, or other aggressive or corrosive
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 and must be installed so that there are
provisions for adequate combustion and ventilation air.
For oil-fired boilers, use the “Installation Code for Oil
Burning Equipment CAN/CSA-B139” (Canada), or NFPA
31 (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. Observe local
jurisdictional requirements.
System layout
The boiler water temperature limit is factory set to 167° F
(75° C) (Vitotronic only).
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, we
recommend that the radiation and domestic hot water
production in the system be designed for a 158° F (70° C)
boiler supply water temperature (new systems).
