PV700a / PV1000a pellet burners
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DK9401B1 www.pelltech.eu
2.3 Water sprinkler
Figure 25 Water sprinkler installation
2.4 External auger
The external auger transports pellets from the pellet container to the burner. The burner controls the
work of the external auger. The auger is connected to the burner with a special hose (
∅
76mm), which is
made from easily melting material- polyurethane that acts as a safety measure against back-burning.
PV1000a pellet burner´s fuel consumption at full power is about 208-222 kg of pellets per hour ( 3,3-3,7
kg per minute ). External auger´s productivity for PV700/PC1000 must be at least 270kg of pellets per
hour. The auger can be fixed to the storage or a ceiling depending on the conditions at the installation
site.
Critical requirements for external auger installation:
The raising angle of the auger must not exceed 45°
The end of the exit tube of the auger and the input of the burner must not be aligned. The
recommended minimal horizontal distance is ca 20cm.
The distance between the input of the burner and the exit tube of the auger must be at least
60cm vertically – recommended distance is 80-200cm.
Hose between auger and burner must be tight, otherwise pellets will block the auger. Falling
angle must me between 65° and 85°.
All critical requirements for installation of external auger are depicted in Figure 26 .
Principal chart of water sprinkler installation is
depicted in Figure 25. Water sprinkler is main
safety element against back-burning. It is
strongly recommended to install sprinkler
system. Pressure switch allows starting the
burner only if water supply is present. If no
water is available on installation site, reservoir
can be filled manually. In this case, pressure
switch is not connected to safety circuit as there
is no pressure in water system.
In case of back-burning, sprinklers will open and
fire is extinguished in feeder tubes. Flow control
valve limits the amount of water flowing into
burner after the reservoir is emptied. The
burning chamber must be cleaned from wet ash
and pellets before turning the burner back on
again.
