Viessmann Vitodens 222-F B2TB Application Manual Download Page 20

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Boiler location

As a direct vent appliance, the Vitodens 222-F can
be installed for room air independent operation (sealed
combustion) regardless of size and ventilation method
of the room in which it is located.
The Vitodens 222-F can be installed, for example, in
the main living area of a house, in non-ventilated utility
rooms, cupboards, closets and alcoves with no clearance
required from combustible materials, as well as in attics
with a direct outlet for the flue gas/fresh air system.
Follow all local and national codes.

Flue gas system

Viessmann PPS (Polypropylene) concentric flue gas/
fresh air systems for room air independent operation
(sealed combustion) and side wall venting are tested
to ANSI Z21.13 - CSA 4.9 - 2000 standards and are
certified together with the Vitodens 222-F boiler as a
constructional unit.
The Vitodens 222-F boiler may also be vented vertically,
using an AL29-4C

special stainless steel, single-wall, room

air dependent venting system (UL listed for category IV).
For a more detailed description of the direct vent and
single-wall vent system, please refer to the Vitodens 222-F
Venting System Installation Instructions.

Flue gas temperature protection

Flue pipes used for the Vitodens 222-F are suitable for
max. flue gas temperatures of up to 230°F (110°C).
No flue gas temperature protection is required as the
maximum permissible flue gas temperature is not
exceeded in any operating condition or in the event of
malfunctioning.

Low water cut-off

A low water cut-off may be required by local codes.
If the 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.

Water connections

Vitodens 222-F boilers can be used in any fully pumped
hot water heating system.
Minimum system pressure is 14 psig.
Chemical corrosion protection products
Corrosion does not typically occur in sealed heating
systems which have been correctly installed and are
correctly operated.
Many manufacturers of plastic pipes recommend the
use of chemical additives. In this case, only those
commercially available corrosion protection products
approved for boilers with domestic hot water heating
via single-wall heat exchangers (instantaneous plate
heat exchangers or DHW tanks) must be used.

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. Maximum antifreeze
content is 50% for the Vitodens 222-F boiler. 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 a MSDS (Material Safety Data Sheet) for the
antifreeze used to the system operator/ultimate owner.