Grant Vortex VTXBH15/26 User Manual

Page 39Section 10: Commissioning
1
2
4mm
+
0
3mm
0
-
5.75mm
0.2
0.5
Figure 10-9: Ignition electrode settings
11. Check/adjust the electrode assembly to give the correct gap
(4mm) between the nozzle and electrodes. Refer to Figure
10-9.
• To adjust the electrode position:
- Loosen the electrode clamp screw.
- Slide the electrode assembly to give the correct gap
of 4mm.
- Tighten the electrode clamp screw.
12. Re-t the burner head. Refer to Figure 10-8.
• Locate the head xing screws in the countersunk slots in
the burner collar.
• Tighten the two screws (3) to secure the head (2) in
position on the burner.
13. Check the combustion head setting.
• The correct head setting depends on the required output
of the boiler. Refer to Table 2-2
• This should be set to ‘0’ in all cases except when the
46-70 is set to either 64 or 70kw) output.
• In this case the head is set to ‘4’ (i.e. on the 4th line).
Refer to Figure 10-10.
14. To adjust the head setting (if required):
• Loosen the two screws in the curved slots in outer ring
of the head (NOT the two head xing screws). Refer to
Figure 10-10.
• Rotate the end of the burner head until either ‘0’ or the
2nd line, as required.
• Tighten the two screws to x the head in the required
position.
0
Shutter
Blast tube
Screw
Slotted ring
Screw
Figure 10-10: Riello RDB 3.2 combustion head adjustment
10.4 AIR ADJUSTER DISC:
15-26 AND 26-46 MODELS ONLY
! NOTE !
If the 15-26 model is to be set to 26kW, the air adjuster disc
is not required. It should be removed from the burner and
discarded.
If the 26-46 model is to be downrated to either 26 or 31kW,
an air adjuster disc (Grant UK product code Z20094349)
must be tted as described below.
This disc is NOT supplied with the 26-46 model, but is
available free-of-charge by contacting Grant UK.
The Riello RDB 2.2 BX burner tted to these boilers incorporates
a secondary air adjustment.
This is an air adjuster disc located on the fan housing (inside the
air inlet housing).
It is essential, for correct operation of the burner, that this internal
air adjuster disc is correctly set. Refer to Figure 10-11.
Figure 10-11: Air adjuster disc
To access the air adjuster disc:
1. Ensure the boiler is isolated from the electrical supply.
2. Remove the burner xing nut (located at the top of the
mounting ange) and withdraw the burner from the boiler.
3. Undo the two screws and remove the air inlet cover from the
side of the burner.
4. On 15-26 models, the air adjuster disc is supplied tted on
the fan housing. For 26-46 models, the disc must be tted on
the fan housing in order to downrate the ouput to either 26kW
or 31kW. Refer to Figure 10-11.
5. For 15-26 models, check that this disc is correctly set for the
factory set output of the boiler, i.e. with the correct cut-out
mark located against the moulded boss on the fan housing.
Refer to Table 2-2 for correct disc settings. If the disc is not
correctly set it MUST be re-positioned. Refer to step 7.
6. If the burner is to be set to a di󰀨erent output than the factory
setting, the air adjuster disc MUST be set to the required
setting for that output. Refer to Table 2-2 for correct disc
settings.

Grant Vortex VTXBH15/26 Specifications

General

Brand	Grant
Model	Vortex VTXBH15/26
Category	Boiler
Language	English