Power Failure Provision; Venting Requirements - Viessmann Vitoflex 300-UF Series Installation And Operating Instructions Manual

Safety

Power Failure Provision

Power Failure Provision

Venting Requirements

16
Vitoflex 300-UF Installation & Operating
Customers must ensure that there is a supply of water
independent of the electrical supply. This design ensures
that in case of a power failure, the boiler will be reliably
cooled by the thermal safety flush valve.
The Vitoflex 300-UF Grate Firing System is equipped with
a flue gas exhaust blower.
This boiler must be properly vented. Use a vent material
certified for use with solid-fuel fired equipment.
This boiler shall be connected to:
a) a masonry chimney conforming to local regulations
or, in the absence of such regulations, to the
requirements of the National Building Code
b) a certified factory-built chimney (refer to the NFPA
211 standard).
A flue pipe serving this boiler shall be constructed of
steel or other suitable material with a melting point of
not less than 2000°F (1100°C).
IMPORTANT
Do not use galvanized steel
For installations in Canada:
The boiler venting system must be tested and listed by
a Nationally Recognized Testing Lab such as ULC/CSA
for solid fuel burning appliances.
The Vitoflex 300-UF Grate Firing System is output-
controlled within a range from 30%-100% of the rated
boiler output. This produces flue gas temperatures from
min. 212°F (100°C) to max. 482°F (250°C).
An insulated chimney should be provided to prevent sooting.
The distance from the flue gas exhaust blower to the
chimney should be as short as possible. 90° elbows
should be avoided if possible. Flue gas pipes of more than
3 ft. (1 m) in length must be insulated.
The connection to the chimney should be made such that
it rises at an angle of 30°- 45° (to prevent excess ash
accumulating in the lateral section of the vent pipe).
The flue gas line, including the lead-in into the chimney,
must be gas-tight.