Grant Vortex Series User Manual

Page 35Section 10: Commissioning
! NOTE !
Do not overtighten the xing screw as this may damage
the electrode insulator.
±0.5
A
±0.3
B
C
Figure 10-4: Ignition electrode settings
Model A B C
Combi 21 and 26 7 2.5 2.5 - 3
Combi 36 4.5 3 2 - 2.5
Note: all dimensions given in mm
6. Check/adjust electrode setting. Refer to Figure 10-4.
7. Re-t the burner head. Refer to Figure 10-3.
• Locate the head xing screws (1) in the countersunk
slots in the burner collar.
• Check that the small oil drip hole (on the head) is
pointing downwards.
• Tighten the three screws (1) to secure the head (2) in
position on the burner.
8. Adjust the di󰀨user position. Refer to Figure 10-5.
A
1
D
Figure 10-5: Riello RDB 2.2 BX di󰀨user position and gauge plate
! NOTE !
The distance between the end of the burner head and the
front face of the di󰀨user (D) MUST be correctly set for the
burner to operate correctly.
• Refer to Table 2-2 for the required distance (head
setting) for the boiler output required.
• Check the distance D using the gauge plate supplied
with the boiler.
• To use the gauge plate:
- Position the gauge on the burner head as shown in
Figure 10-5.
- Locate the gauge with the correct steps (i.e. the two
marked with the required distance D) resting on the
edge of the burner head.
- Check the gauge plate is at 90° to the end of the
burner head and is positioned at the full diameter of
the head.
- If the distance D is correct, the tongue of the gauge
plate should just make contact with the di󰀨user,
with BOTH steps still in contact with the edge of the
burner head.
- If the steps are not in contact with the edge of the
burner head, when the tongue of the gauge is
touching the di󰀨user, the di󰀨user must be ‘opened’
(see below).
- If the tongue does not reach the di󰀨user, when the
steps are in contact with the edge of the burner
head, the di󰀨user must be ‘closed’ (see below).
• To adjust the di󰀨user position:
- If necessary, adjust distance D using the black
adjustment knob located around the oil supply pipe
on the front of the burner. Refer to item A (Figure
10-5). Re-check distance D using the gauge plate,
as described above.
- For easier access to the adjustment knob, pull the
photocell out from the burner housing.
- To increase distance D (to open the di󰀨user): rotate
the knob clockwise - indicated as ‘+’ on the knob.
- To decrease distance D (to close the di󰀨user):
rotate the knob anti-clockwise - indicated as ‘-’ on
the knob.
! NOTE !
One full rotation of the adjustment knob is approximately
1mm of di󰀨user movement.
! NOTE !
It is essential that the nal position of the di󰀨user is
checked, using the gauge plate provided with the boiler
and the di󰀨user adjusted as necessary to achieve the
required distance D.
9. For Combi 21 models only:
Check the burner air adjuster disc is correctly set. Refer to
Section 10.3.

Grant Vortex Series Specifications

General

Brand	Grant
Model	Vortex Series
Category	Boiler
Language	English