SERVICE AND SPARES
6 720 804 532 (2012/09)
37
Fig. 81 Gas valve connection
▶ Remove electrical connector and earth wire from fan.
▶ Disconnect spark electrode and flame sensor connections.
1. Refer to figure 82 and undo the securing nut on the top of the heat
exchanger and remove the retaining plate assembly.
Fig. 82 Securing nut
1. Refer to figure 83 and rotate fan and air/gas manifold assembly
around the top of the heat exchanger until it stops at the lug.
▶ Lift up assembly and remove from boiler.
2. Remove the cover panel by removing retaining screw.
Fig. 83 Rotate air/gas manifold
BURNER REMOVAL
Refer to figure 84
1. Remove clamping plate.
2. Remove spark/flame electrode assembly and seal from the top of the
heat exchanger.
3. Remove burner.
Fig. 84 Burner removal
Checking and cleaning the electrode assembly:
▶ Inspect the condition of the electrodes and ceramics, replace if
necessary.
▶ Use a plastic scouring pad to clean the electrodes.
BAFFLE REMOVAL
Refer to figure 85.
1. Remove top baffle.
2. Remove lower baffle.
To prevent damage to the electrodes when removing the
air/gas manifold, disconnect the leads to the electrodes.
1.
2.
6720643895-72.1Wo
1.
6720643895-60.1W
o
6720804530-16.1Wo
1.
2.
NOTICE:
Cleaning
▶ Do not use wire wool to clean the electrodes
If the lower baffle is stuck, it may be necessary to use the
“Baffle removal tool” from the heat exchanger cleaning
kit - 7 716 192 312, as shown in figure 85.
1.
2.
3.
6720643895-61.1W
o