Section 11: Boiler Servicing
page 39
11.5 CLEaNiNG tHE BURNER
15/21, 21/26, 26/35 aND 36/46 mODELS
The procedure is as follows:
1. Combustion head: Loosen the two screws securing the
combustion head and remove the head from the burner.
2. Clean the combustion head.
3. Inspect the ignition electrodes - refer to Figure 11-6.
Loosen the electrode clamp screw (A) and withdraw the
electrode assembly. Refer to Figure 11-1.
Wipe clean and check for any cracks in the ceramic
insulation. Replace if necessary.
4 ±
0.3 mm
A
2 - 2.5
mm
Figure 11-6:
15/21, 21/26, 26/35 and 36/46 electrode settings
4. Nozzle: The nozzle should be replaced on an annual service.
Check that the nozzle size and type are correct, refer to table
in Section 2.2 and boiler data label.
5. With the combustion head removed, loosen the electrode
assembly clamp screw and slide the electrodes away from
the nozzle.
6. Do not attempt to clean the nozzle.
7.
Remove the nozzle using a good fitting spanner (16 mm).
! CaUtiON !
The use of an ill-fitting spanner will damage the nozzle and
could lead to an incorrect flame pattern.
8. Always check the electrode settings after replacing the
nozzle, see Figure 11-6.
46/58 aND 58/70 mODELS
2
5
4
7
6
1
3
The procedure is as follows:
1. Combustion head: Loosen the two screws (3) securing the
combustion head (not the screws in the slotted ring, Figure
10-6) and remove the combustion head from the burner.
2. Clean the combustion head (2).
3. Inspect the ignition electrodes (5):
Loosen the electrode clamp screw, disconnect the leads (4)
and withdraw the electrode assembly.
Wipe clean and check for any cracks in the ceramic
insulation. Replace if necessary.
4. Check the electrode and diffuser settings: Figure 11-7.
1
2
B
+ 0.5
0
3
0 - 0
.2
5.
75
A
Figure 11-7:
46/58 and 58/70 electrode settings
5. To adjust the diffuser disc: Loosen the diffuser clamp screw
and slide the disc along the nozzle holder to achieve the gap
‘A’ in Figure 11-7 (and Table 11-8), tighten the screw.
table 11-8:
46/58 and 58/70 electrode settings
A
7.5
+ 0.7
- 0.5
B
4
± 0.5
6. To adjust the electrodes: Loosen the electrode clamp screw
and move the electrode unit to achieve the gap ‘B’ in Figure
11-7, tighten the screw.
7. The combustion head position is adjustable on the 46/58 and
58/70 burners. Check that it is fully closed (position 0), or
the 4th line if the 58/70 has been set to maximum output (70
kW).
8. To adjust the head setting, refer to Section 10-3.
9. Check the condition of the o-ring seal around the collar of the
burner head. Replace if necessary.
aLL mODELS
photocell
The photocell is a push-fit in the burner body. Carefully pull it out
to clean.
air intake
Unscrew the two screws and remove the air intake box from the
burner.
Inspect and clean as necessary.
Burner fan
With the air intake box removed, remove the four screws securing
the fan housing cover (R/H side of burner) and remove the cover.
Inspect the fan and housing and clean as necessary. Refit the
cover.
Pump filter
With the burner cover removed, remove the four screws securing
the pump end cover. Remove the filter and wash in kerosene.
Replace the filter and end cover, ensure the ‘O’ ring is in position.
Re-assemble in reverse order.
! WaRNiNG !
To ensure safe and efficient operation of the boiler it is
important that recommissioning is carried out, especially
combustion checks (%CO
2
level, flue gas temperature and
smoke number) after the boiler has been serviced.
Refer to the Commissioning instructions in Section 10.
Summary of Contents for Vortex VTXBH1521
Page 51: ...Notes Page 51 NOTES...
