Fire Protection; Power Failure Provision; Protection Against Back-Burn For The Boiler Plant; Automatic In-Feed Auger Extinguishing System - Viessmann Vitoflex RF 150 Installation And Service Instructions Manual

Mechanical
Piping and Installation of Safety Devices
Design recommendation (continued):
Boiler pump
Boiler model
RF 150
RF 220
RF 300
RF 400
RF 540
Mixing valve
Boiler model
RF 150
RF 220
RF 300
RF 400
RF 540
Viessmann ASME recommended tank sizes (U-stamped)
Boiler model
RF 150
RF 220
RF 300
RF 400
RF 540

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 safety flush valve.

Protection against back-burn for the boiler plant

The following safeguards are part of the scope of supply
for the Vitoflex 300-RF Rotating Combustion System:
- Preventing overfilling of the combustion chamber
A level monitor must be installed to prevent overfilling
of the combustion chamber. The Vitoflex 300-RF
Rotating Combustion 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
- Back flash safeguard
The Vitoflex 300-RF Rotating Combustion System is
operated with continuous negative pressure and is
equipped with a backflash prevention device. This
device prevents backflashes caused by flying embers
or combustible gases that may ignite the fuel system.
34
Pump
UPS 32-80 F
UPS 40-80/4 F
UPS 50-80/4 F
UPS 80-80/4 F
UPS 80-80/4 F
Nominal Valve
pipe size
3-way mixing valve
2b in.
3-way mixing valve
2b in.
3 in. 3-way mixing valve
3 in. 3-way mixing valve
4 in. 3-way mixing valve
Tank size
L
1514
2006
2650
3785
5678
(continued)
Freq.
60 Hz
60 Hz
60 Hz
60 Hz
60 Hz
USG
400
530
700
1000
1500

- 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-RF
Rotating Combustion 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.
Vitoflex 300-RF Installation & Operating
Voltage and phase
3 x 208-230V
3 x 208-230V
3 x 208-230V
3 x 208-230V
3 x 208-230V
Speed
3
1
2
2
3