Technical data

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Vitorond 200, VD2A Technical Data
System Design
System Design Considerations (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 in accordance with applicable local codes.
In the absence of local codes, use CAN/CSA-B149.1 or .2
Installation Codes for Gas Burning Appliances for Canada.
For U.S. installations use section 5.3, Air for Combustion
and Ventilation, of the National Fuel Gas Code ANSI
Z223.1.
For oil burning installations use CSA B-139 for oil
installations in Canada and NFPA 31 Standard for the
Installation of Oil Burning Equipment in the US. Always
use latest editions of codes.
Whenever possible, install boiler near an outside wall so
that it is easy to duct fresh air directly to the boiler area.
Refer to national codes for duct sizing and allowable
lengths. Round ducts can be used.
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.
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.
Water quality and freeze protection
Treatment for boiler feed water should be considered
in areas of known problems, such as where a high mineral
content and hardness exist. In areas where freezing might
occur, an antifreeze may be added to the system water
to protect the system.
Please adhere to the specifications given by the antifreeze
manufacturer. Do not use automotive silicate-based
antifreeze. Please observe that an antifreeze/water
mixture may require a backflow preventer within the
automatic water feed and influence components such
as diaphragm expansion tanks, radiation, etc.
A 40% antifreeze content will provide freeze-up
protection to -10° F (-23° C). Do not use antifreeze
other than specifically made for hot water heating
systems. System also may contain components which
might be negatively affected by antifreeze. Check total
system frequently when filled with antifreeze.
Follow the instructions of antifreeze manufacturer.
Oxygen diffusion barrier underfloor tubing
The boiler warranty does not cover leaks resulting from
corrosion caused by the use of underfloor plastic tubing
without an oxygen diffusion barrier. Such systems
must have the tubing without oxygen diffusion barrier
separated from the boiler with a heat exchanger.
Viessmann recommends the use of underfloor plastic
tubing with an oxygen diffusion barrier.
Factory pre-wired components
Custom factory pre-wiring by Viessmann ensures optimal
functionality, compliance with regional requirements,
and ease of installation in the field. Pricing provided
by Viessmann includes all necessary hardware items such
as junction panel, burner power supply, boiler door safety
switch (where necessary), and all essential pressure
switches, as well as interconnection with conduit
between control and burner.
Electrical drawings provided upon product delivery.
Boiler/Burner start-up
Vitorond 200, VD2A boilers with Weishaupt burners
require start-up by Viessmann.
Please inquire to obtain details regarding the necessary
prerequisites of boiler/burner start-up procedures.
IMPORTANT
To minimize delivery lead times, please ensure that
critical technical information is provided at time of order.
Viessmann will not process an order without site-specific
information regarding available voltage and gas pressure.
In addition Viessmann recommends that gas pressure
information be provided in writing by the local gas utility.