PV20a / PV30a pellet burner
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5. In case the fuse burns out again, the component which is connected to the fuse probably needs
replacing.
Table 10 Fuse values
Fuse
Value
Function
F1
0,5A (500mA)
External auger
F2
1A
Fan
F3
1A
Flue gas fan
F4
3A
Igniter
F5
2A
Controller and feeder auger motor
Replacing fuel level sensors
4.8.4
The fuel level sensor consists of an optical transmitter and receiver which are aligned on either side of
the vertical part of the feed screw’s tube. Figure 1 pos 11.
The typical problem of the level sensor is getting dirty. Try cleaning them before replacing the sensor.
While cleaning it should be considered that the lenses of the sensors are made from plastic and they
should not be scratched or made mat any other way. The lens is getting dirty if there is no draught and
the flue gas moves along the feed screw back to the burner. The soot and heat of the flue gas covers the
surface of the sensor with an opaque layer. Sensors should not be replaced before you are absolutely
sure that LEVEL ERROR is caused by sensors. Pellets falling into burner’s inlet tube shall clean sensors
enough. Sensors cleaned too often without direct need will get damaged sooner.
If the lens cannot be reached inside the tube, the sensor may be turned out.
Replacement:
1.
Make sure that burner is removed from supply mains.
2.
Remove burner’s red cover by loosening 4 screws (2 on both sides). See Figure 7.
3.
Disconnect sensors from controller and and turn the sensors out from the tube.
4.
Install new sensors and follow while connecting cables: TRS is black sensor and RSV is white sensor.
5.
Place back burners cover and connect burnet to supply mains.
Replacing flame sensor
4.8.5
The flame sensor may get dirty or melt during back-burning. The flame sensor consists of light reactive
resistors and protective plastic case which is transparent from the end. The case in turn is in a socket
made of black rubber. For replacing the sensor a small (2, 5 ... 3, 5 mm) flat screwdriver is needed for
connecting the wires.
For checking and replacing:
1.
Make sure that burner is disconnected from mains supply.
2.
Remove burner’s red cover by loosening 4 screws (2 on both sides). See Figure 7.
3.
Pull the sensor out of the burner and clean it’s transparent part with soft cloth and alcohol.
4.
In case the sensor has melted disconnect wires from connector X2 and replace the sensor.
5.
The connection order of sensor’s wires is not important. Controller screws must be shut so tightly
that the wire does not come out from underneath the screw when the wire is pulled.
6.
Place back burners cover and connect burner to mains supply.
