Viessmann KOB PYROT KRT SERIES, Technical Data Manual, Page: 27 / 40

27
5443 109 v1.9
Pyrot Technical Data
Mechanical
Mixing valve
Viessmann ASME recommended tank sizes (U-stamped)
Boiler model KRT- Nominal
pipe size
Valve
150
2
b
in.
3-way mixing valve
220
2
b
in.
3-way mixing valve
300 3 in. 3-way mixing valve
400 3 in. 3-way mixing valve
540 4 in. 3-way mixing valve
Boiler model KPT- Tank size
L USG
150 1514 400
220 2006 530
300 2650 700
400 3785 1000
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 run-off safety valve.
Protection against back-burn for the boiler plant
The following safeguards are part of the scope of supply
for the PYROT Rotating Combustion System:
-
Preventing overfilling of the firebox
A level monitor must be installed to prevent overfilling
of the firebox. The PYROT 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 fire box
-
Back flash safeguard
The PYROT 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 PYROT 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
Design recommendation (continued):
Boiler pump
Boiler model KRT- Pump Freq. Voltage and phase
150 UPS 32-80 F 60 Hz 3 x 208-230 V
220 UPS 40-80/4 F 60 Hz 3 x 208-230 V
300 UPS 50-80/4 F 60 Hz 3 x 208-230 V
400 UPS 50-80/4 F 60 Hz 3 x 208-230 V
540 UPS 50-80/4 F 60 Hz 3 x 208-230 V