DK9802C2 PV50c user manual ENG
Vers: C2 page9/38
4.2
Safety devices
The burner will be in every moment monitored by controller board to ensure safe and faultless
operation. Back-burning is the biggest danger risk at burners working procedure. Back-burning appears
when usual pressure or draught conditions have changed in boiler’s combustion chamber.
In order to secure operational and fire safety, PV50c burner is equipped with following safety devices:
Burners controller board:
Controller is always monitoring burners work. If any kind of abnormal
activities should occur that would obstruct normal operation, the burner will make controlled
shutdown.
Flame sensor:
The flame sensor monitors that the unit is burning after the start sequence begins
and during operation mode.
Temperature sensor:
Monitors the temperature of the pellet feeding tube. In case of higher
temperature than normal, the burner will automatically go into end cycle of burning process.
Back up battery:
If mains supply is lost, the burner runs on backup battery power and feeder
auger transports pellets from feeder’s tube to the burning chamber. Battery voltage is checked
always at startup and continuously monitored during the operation.
Safety overheat thermostat:
Switches off the main power supply if the burner is overheated.
Feeder auger is unloaded by using battery
power. Thermostat is triggered at 65
o
C and has to be
reset manually.
Melting hose:
The external auger is connected to the burner with a special hose, which is made
from easily melting polyurethane material. Such measurement avoids entrance of the flame
from burner into external auger and pellet container.
