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5603 878 - 04
Vitoflex 300-RF Installation & Operating
Mixing valve
Viessmann ASME recommended tank sizes (U-stamped)
Boiler model
Nominal
pipe size
Valve
RF
150
2
b
in.
3-way mixing valve
RF
220
2
b
in.
3-way mixing valve
RF
300
3 in.
3-way mixing valve
RF
400
3 in.
3-way mixing valve
RF
540
4 in.
3-way mixing valve
Boiler model
Tank size
L USG
RF
150
1514 400
RF
220
2006 530
RF
300
2650 700
RF
400
3785 1000
RF
540
5678 1500
Piping and Installation of Safety Devices
(continued)
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.
- 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.
The heating contractor must perform the installation of the fire
extinguishing system as specified in section fire extinguishing
systems.
IMPORTANT
Mechanical
Design recommendation (continued):
Boiler pump
Boiler model
Pump
Freq.
Voltage and phase
Speed
RF
150
UPS 32-80 F
60 Hz
3 x 208-230V
3
RF
220
UPS 40-80/4 F
60 Hz
3 x 208-230V
1
RF
300
UPS 50-80/4 F
60 Hz
3 x 208-230V
2
RF
400
UPS 80-80/4 F
60 Hz
3 x 208-230V
2
RF
540
UPS 80-80/4 F
60 Hz
3 x 208-230V
3
