20
5443 113 v1.9
Pyrotec Technical Data
Piping and Installation of Safety Devices
(continued)
Mixing valve
Viessmann ASME recommended tank sizes (U-stamped)
Boiler model KPT-
Nominal
pipe size
Valve
390
3 in.
3-way mixing valve
530
4 in.
3-way mixing valve
720
5 in.
3-way mixing valve
950
5 in.
3-way mixing valve
1250
6 in.
3-way mixing valve
Boiler model KPT-
Tank size
L USG
390
3785 1000
530
5678 1500
720
6624 1750
950
9464 2500
1250
12492 3300
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 PYROTEC Grate Firing System:
- Preventing overfilling of the fire box
A level monitor must be installed to prevent overfilling
of the fire box. The PYROTEC 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 fire box.
- Back flash safeguard
The PYROTEC 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.
- 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 PYROTEC 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.
The heating contractor must perform the installation of
the fire extinguishing system as specified in section Fire
Extinguishing Systems.
IMPORTANT
Boiler Pump
Boiler model KPT-
Pump
Frequency
Voltage and phase
390
UPS 50-80/4 F
60 Hz
3 x 208-230 V
530
UPS 50-80/4 F
60 Hz
3 x 208-230 V
720
UPS 80-160 F
60 Hz
3 x 208-230 V
950
UPS 80-160 F
60 Hz
3 x 208-230 V
1250
TP 100-80/4
60 Hz
3 x 208-230 / 460 V
Design Recommendation (continued):
Mechanical