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1.6. SAFETY ELEMENTS
1.6. FUEL
Safety elements, fuel
Boiler have a few safety elements:
- Bimetal thermostat built on the burner pellet feeding tube. If the bimetal set temperature (80°C)
is exceeded, pellet feeding is stopped, the burner shuts down and the error E3 appears on the
control unit (LED diode switches on).
- If there is no flame (the built in photo-cell does not detect the flame within set time), control
stops the burner operation and error E2 is displayed or it goes to blowing off and error E6 is
- Displayed (LED diode switched on).Control unit has a built in protective function which protects the
boiler against overheating. If temperature in the boiler exceeds 93°C, regardless heating or
sanitary water is needed the boiler pump and/or the sanitary water turns on and works until
temperature in the boiler falls below 93°C.
- The fan has a built-in RPM counter and, if regulation is informed that the fan does not operate in
accordance with the requirement interrupts the process display fan error
- Drive for grate linear move have in-built two switches by wich control unit monitor position of grate.
If grate at given moment is not on provided place, control unit recieve information that grate is not
on provided place and interrupt proces and display information about grate error.
- Flue gas connection have in-built sensor for flue gas temperature meassuring. If flue gas tube
temperature is over 250°C, control unit interrupt proces and display information about too high flue
gas temperature.
When temperature in the boiler exceeds 110°C (+0°C / - 9°C), power supply is turned off by the
safety thermostat (via control unit).
Thermal protection built in coils of the fan electric motor at the burner and the screw feeder motor,
protects them against overheating caused by failure or locking.
A flexible tube connecting the pellet burner and pellet tank is made of plastic material reinforced with
metal wire which, in case of back flame from the burner to the tank, melts and prevents flame to
penetrate to the pellet tank.
Only wood pellets are used as fuel in Polifuel. Wooden pellets are bio-fuel made of wooden wastes.
Pellets can be packed in different packaging: in bags (15 kg or 1000 kg), or as bulk in large
3
(underground) tanks ( 4 - 15 m ) or in basement spaces. Recommended properties of pellets for firing in
Polifuel boilers are the following:
- heating value >= 5 kWh/kg (18 MJ/kg)
-diameter <= 6 mm
-max. moisture content <= 12 %
-max. dust content <= 1,5 %.
15
Technical instructions Polifuel
15


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