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16.3
BURNER REMOVAL
If it has been determined that the flame picture is unacceptable, the burner can be removed and cleaned using the
following procedure:
1.
Isolate the electrical and gas supplies to the heater.
2.
Allow the boiler to cool down.
3.
Disconnect the wiring connections to the ignition electrode.
4.
Disconnect the power and control connection leads and earthing wire from the combustion fan.
5.
Apply a suitable release oil to the 6 studs around the edge of burner door.
6.
Remove the 6 retaining nuts around the edge of the burner door.
NOTE:
Once loosened, the nuts should be removed by hand. If any of the nuts seize, the nut should
gently be re-tightened and additional release oil used.
7.
Withdraw the heat exchanger front plate and burner assembly from the heat exchanger complete with
the combustion fan.
8.
With the burner assembly away from the boiler, the burner can be gently cleaned with the brush
attachment of a vacuum cleaner.
The reassembly procedure is the reverse of the above taking care to ensure that the for the heat exchanger front
plate sealing gasket, the combustion fan connection gasket, the burner door insulation and the combustion
chamber rear wall insulation are in good condition or are replaced as necessary.
When refitting the burner door, the door should be carefully located on the studs and pushed firmly in to
place whilst all of the retaining nuts are tightened by hand. Once all nuts are hand tight, they should be
tightened in the order stated in Figure 16.1 to a torque of 8 Nm
NOTE:
PARTICULAR ATTENTION SHOULD BE PAID TO THE COMBUSTION CHAMBER REAR WALL
INSULATION.
INSULATION PANEL MUST BE REPLACED.
FIGURE 16.1
IF ANY DETERIORATION IN THE INSULATING MATERIAL IS NOTED, THE
BURNER DOOR RETAINING NUT TIGHTENING ORDER
78
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