PV20a / PV30a pellet burner
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DK9902A1 www.pelltech.eu
Replacing fan
4.8.6
The air in boiler room contains dust that can deposit on fan bearings. The best cure is to keep boiler
room as clean as possible. Otherwise the fan bearings get stuck after several years of working and must
be replaced. For replacement small flat screwdriver (2,5…3,5mm) and at least 18 mm tall crosshead
screwdriver (preferably with magnetic tip) are needed.
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.
Disconnect gray and blue wire from fan and control cable from FAN socket on controller board.
4.
Remove the rest of the plugs attached to the controller. Green plugs must be pulled out in parallel
direction of the plate.
5.
Remove the tin attaching the controller that prevents the access to the fan. Two tin screws from
the lower edge of the burner and one screw on top of the burner must be turned loose in order to
do that.
6.
For accessing the screws of the fan, removing or shifting the battery is necessary. The battery is
attached to the bottom with a double-sided tape.
Warning
! If possible, do not remove the battery contacts because in case of wrong assembling the
controller will be ruined and it is dangerous for the person.
7.
Turn loose the four screws folding the fan and replace fan.
8.
Place back the battery and controller with the tin. Chart inside the burner’s front cover facilitates
connecting the sensors.
9.
Reconnect fan’s control cable to FAN socket and the rest of the plugs.
10.
Reconnect gray and blue wires with the fan.
Replacing feeder auger motor
4.8.7
The condition of the feeder auger’s motor is crucial for safety. Failed feeder auger motor may cause
back-burning. Therefore the motor must be replaced after every 2000 working hours or after 30 tons of
pellets are burned or when the burner gives warning FEEDER ERR. Roughtly calculated amount of
pellets burnt (in kg) is accessible from INFO menu.
To replace the motor the spiral of feeder auger has to be removed and 4 nuts fixating motor unrolled.
To do that tall 4 mm hex wrench, spanner no. 8, small 2,5..3 mm flat screwdriver and tall tweezers to
remount the metal bushing are needed.
1.
Remove the fan and tin what holds controller. See 4.8.6
2.
In order to remove the spiral, the screw connecting the spiral and motor must be seen from the top
of inlet tube. If screw is not seen the shaft of motor has to turned. Disconnect motors wires 7 and 8
from terminal X2 (See Annex 1 Table 12) and touch the battery inside the burner’s case with wire ends
until the screw of the spiral is in approachable position. The motor can be connected to the battery
from both sides.
Warning!
Do not remove battery contacts because in case of wrong assembling the burner’s controller
will be ruined.
3.
Turn loose spiral’s hex screw (4 mm hex wrench) and pull spiral out. Don’t remove screw!
4.
Turn out the four nuts that are keeping the motor attached to the casing. Pay attention that the nut
was not tightened to rubber bunt.
5.
Remove the motor. The motor rests on the rubber bunts and therefore the removal of the motor
some applied force is necessary.
6.
Place the new motor.
7.
Screw back the four nuts. Nuts must be tightened only until they are at the end of the thread with
their total length. Nuts must not be tightened to the rubber bunts. It reduces the lifetime of the motor
and increases the burner’s working noise.Touch battery with motor wires as long as oblate part on
motor’s shaft is seen from above of feeder’s tube.
8.
Touch battery with motor wires as long as motors shaft has turned to approachable position.
9.
By using tall tweezers place metallic bushing back to feeder motors shaft.