Installation & Servicing Instructions - Grant UK
Installation & Servicing Instructions - Grant UK
Installation & Servicing Instructions - Grant UK
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4. Nozzle: The nozzle should be<br />
replaced on an annual service.<br />
Check that the nozzle size and type<br />
are correct, refer to table in Section<br />
2.3 and boiler data label.<br />
5. With the combustion head removed,<br />
loosen the electrode assembly clamp<br />
screw and slide the electrodes away<br />
from the nozzle.<br />
6. Do not attempt to clean the nozzle.<br />
7. Remove the nozzle using a good<br />
fitting spanner (16 mm).<br />
!<br />
CAUTION<br />
The use of an ill-fitting spanner will<br />
damage the nozzle and could lead to<br />
an incorrect flame pattern.<br />
8. Always check the electrode settings<br />
after replacing the nozzle, see Figure<br />
11-6.<br />
Combustion<br />
head<br />
Electrode clamp<br />
screw<br />
Electrode<br />
leads<br />
Nozzle<br />
holder<br />
Figure 11-7: 46/58, 58/70 burner<br />
Combustion head<br />
fixing screw<br />
Diffuser clamp<br />
screw<br />
Burner<br />
flange<br />
4 ± 0.3 mm<br />
3 +0.5<br />
0<br />
Electrode clamp screw<br />
B<br />
Clamp screw<br />
3 to 3.5 mm<br />
Figure 11-6: 15/21, 15/26, 26/36, 36/46<br />
electrode settings<br />
5.75 0<br />
-0.2<br />
Diffuser clamp screw<br />
A<br />
B<br />
7.5 +0.7<br />
- 0.5<br />
4.0 +0.5 _<br />
Diffuser disc<br />
A<br />
46/58 or 58/70 models<br />
The procedure is as follows:<br />
1. Combustion head: Loosen the two<br />
screws securing the combustion head<br />
(not the screws in the slotted ring,<br />
Figure 11-7) and withdraw the head.<br />
2. Clean and refit the combustion head.<br />
3. Inspect the ignition electrodes:<br />
Loosen the electrode clamp screw,<br />
disconnect the leads and withdraw the<br />
electrode assembly. Wipe clean and<br />
check for any cracks in the ceramic<br />
insulation. Replace if necessary.<br />
4. Check the electrode and diffuser<br />
settings: Figure 11-8.<br />
Figure 11-8: 46/58, 58/70 electrode settings<br />
5. To adjust the diffuser disc: Loosen<br />
the diffuser clamp screw and slide<br />
the disc along the nozzle holder to<br />
achieve the gap 'A' in Figure 11-8,<br />
tighten the screw.<br />
6. To adjust the electrodes: Loosen the<br />
electrode clamp screw and move the<br />
electrode unit to achieve the gap 'B'<br />
in Figure 11-8, tighten the screw.<br />
7. The combustion head position is<br />
adjustable on the 46/58 and 58/70<br />
burners. Check that it is fully closed<br />
(position 0), or the 4th line if the<br />
58/70 has been set to maximum<br />
output (70 kW).<br />
8. To adjust the head setting, refer to<br />
Figure 11-9 and proceed as follows:<br />
Loosen the two screws in the slotted<br />
ring - not the two fixing screws, and<br />
turn the blast tube until '0' or the<br />
4th line lines up with the edge of the<br />
slotted ring (see paragraph 7 above).<br />
Tighten the two screws.<br />
Boiler <strong>Servicing</strong><br />
35
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