Power Failure Provision; Venting Requirements - Viessmann Vitoflex 300-RF Technical Data Manual

Safety

Power Failure Provision

Venting Requirements

10
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.
Backup power supply or backup generator is highly
recommended to ensure continious operation in the event
of power failure.
The Vitoflex 300-RF Rotating Combustion 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-RF rotating combustion 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,
condensation and creosote formation.
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.
Vitoflex 300-RF Technical Data