DK9802C2 PV50c user manual ENG
Vers: C2 page26/38
8.3
Replacing fuses
Burner’s controller is protected against the errors of external devices with electrical fuses. Fuses may burn
out in case a foreign object gets into the fan or motor and blocks their work. Fuses are located in the
controller’s plate and are labelled as F1...F11.
Replacing:
1. Make sure the burner is removed from mains supply.
2. Remove burner covers.
3. Remove the fuse and check its state with a tester or looking it against the light.
4. Replace the fuse with an equivalent one if necessary. The plastic cover of the fuse holder must be
placed back directly not skewed. Otherwise the cover might push the holder’s contacts far from each
other and break the connection.
6. Put covers back.
7. Connect mains supply.
In case the fuse burns out again, the component which is connected to the fuse probably needs replacing.
8.4
Replacing fuel level sensors
Fuel level sensor consist of two parts – transmitter and receiver, which are located on vertical part on
opposite sides of feeder auger’s vertical tube. See Figure 4.
Most common error to level sensors is getting
dirty. At first you may try to clean them. When cleaning, try to avoid scratching or making lenses opaque.
Remember that lenses of sensors are made from plastic! Lens get dirty when draught in boiler is weak and
smoke moves throught feeder tube back to 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
E28LEVEL error is caused by sensors. Sensors cleaned too often without direct need will get damaged
sooner.
If in any reason you can’t reach lenses inside the burner’s tube you may take them out for cleaning. To do
that release screws fixing sensors and pull sensors out from sockets on controller board.
Sensor’s replacement:
1.
Make sure that burner is disconnected from mains.
2.
Remove burner’s covers.
3.
Unscrew sensor’s fixing screw from feeder’s tube.
4.
Remove sensor by pulling it out of green socket.
5.
Plug new sensor to socket. Fix it with screw to feeder’s tube.
6.
Make sure that in reconnecting: TRS is dark sensor and RSV is transparent sensor.
Figure 19 Safety thermostat
