Viessmann VITOROND 100 Technical Data Manual page 10

Installation
Vitorond 100, VR1 Technical Data
System Design Considerations
(continued)
Water quality
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.
Advise system operator/ultimate owner that system is
filled with a glycol mix.
The heating contractor must provide an MSDS (Material
Safety Data Sheet) for the antifreeze used to the system
operator/ultimate owner.
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 non-oxygen diffusion barrier tubing separated
from the boiler with a heat exchanger. Viessmann
recommends the use of underfloor plastic tubing with
an oxygen diffusion barrier.
Low water cut-off
A low water cut-off may be required by local codes.
If boiler is installed above the radiation level, a low water
cut-off device of approved type must be installed in all
instances. An approved type low water cut-off device
must be provided by the, heating contractor. Do not
install an isolation valve between the boiler and the
low water cut-off.
Hydrostat control model 3250 PLUS is equipped with
low water cut-off.
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