PV20a / PV30a pellet burner
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DK9902A1 www.pelltech.eu
Figure 20 Placement of igniter
Resetting safety thermostate
4.8.2
Warning!
To reset safety thermostate burner has to be disconnected from power circuit
.
When burner is overheated the safety thermostate turns it off. Overheating may arise when draught in
boiler is in wrong direction and pellets start the back- burning in feeder auger.
Thermostat is located on the horizontal tube of feeder auger Figure 19.
In case of overheating the burner flashes yellow indicator and displays message OVERHEAT.
The safety thermostat with button has to be reset manually:
1.
Make sure the burner has cooled down and disconnected from power supply.
2.
Remove burner’s red cover by loosening 4 screws, 2 on both sides. See Figure 7.
3.
Press small button on thermostat (Figure 21). Place cover back.
4.
Connect supply mains.
5.
Press OK for 5s and burner should start to work.
6.
If flame indicator keeps on flashing and fuse F5 is well, replacement of thermostat is needed.
If mains supply returns the message NO POWER remains in screen. Restart burner by holding OK and
ESC buttons down more than 3 seconds.
Figure 21 Safety thermostat
Replacing fuses
4.8.3
Burner’s controller is protected against the errors of external devices with electrical fuses. Fuses may
burn out in case e.g. foreign object gets into the fan or motor and blocks their work.
Fuses are located in the upper side of the controller’s plate and are labeled as F1...F5.
Replacing:
1. Make sure the burner is removed from power circuit.
2. Remove burner’s red cover by loosening 4 screws (2 on both sides). See Figure 7.
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 obliquely. Otherwise the cover might push the contacts far from each other
and break the connection.
