Fire Protection; Power Failure Provision; Protection Against Back-Burn For The Boiler Plant - Viessmann Vitoflex 300-UF Series Installation And Operating Instructions Manual

Mechanical
Piping and Installation of Safety Devices
Design Recommendation (continued):
Boiler pump
Boiler model
UF 390
UF 530
UF 720
UF 950
UF 1250
Mixing valve
Boiler model
UF 390
UF 530
UF 720
UF 950
UF 1250

Fire Protection

Follow local regulations for wood-fired heating systems.

Power failure provision

The customer 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 run-off safety valve.

Protection against back-burn for the boiler plant

The following safeguards are part of the scope of
delivery for the Vitoflex 300-UF Grate Firing System:
- Preventing overfilling of the combustion chamber door
A level monitor must be installed to prevent overfilling
of the combustion chamber door. The Vitoflex 300-UF
Grate Firing System has a light barrier to monitor the
embers.
- Preventing back-burn
With a temperature sensor directly on the in-feed auger,
any danger of back-burn initiation will be detected and
quickly counteracted at an early stage by increasing the
fuel conveyance speed into the combustion chamber
door.
- Back flash safeguard
The Vitoflex 300-UF Grate Firing System is operated
with continuous negative pressure and is equipped
with a back flash prevention device. This device
prevents back flashes caused by flying embers or
combustible gases that may ignite the fuel system.
30
Pump
UPS 50-80/4 F
UPS 50-80/4 F
UPS 80-160 F
UPS 80-160 F
TP 100-80/4
Nominal Valve
pipe size
3 in. 3-way mixing valve
4 in. 3-way mixing valve
5 in. 3-way mixing valve
5 in. 3-way mixing valve
6 in. 3-way mixing valve
Vitoflex 300-UF Installation & Operating
(continued)
Frequency
60 Hz
60 Hz
60 Hz
60 Hz
60 Hz
Viessmann ASME recommended tank sizes (U-stamped)
Boiler model
UF 390
UF 530
UF 720
UF 950
UF 1250
- Automatic in-feed auger extinguishing system
The supplied fire extinguishing system is necessary on
the in-feed auger. This system should reliably prevent
back- burn in case of a malfunction (such as a power
failure). For safety reasons and to prevent damage by
flooding, connecting the extinguishing system directly
to the water network is not advisable.
This extinguishing system must be equipped with a
6.6 USG (25 L) extinguishing water tank with a float-
type switch and an adjustable Danfoss extinguisher
valve. The tank for the extinguishing system must be
equipped with a level monitoring system.
If there is a shortage of water, the Vitoflex 300-UF
Grate Firing System will switch off automatically.
In case of excess temperature, the in-feed auger will
be flooded reliably but in a limited fashion.
IMPORTANT
The heating contractor must perform the installation of
the fire extinguishing system as specified in section Fire
Extinguishing Systems.
Phase and voltage
3 ph 208 VAC
3 ph 208 VAC
3 ph 208 VAC
3 ph 208 VAC
3 ph 208 VAC
Tank size
L USG
3785 1000
5678 1500
6624 1750
9464 2500
12492 3300