Grant Vortex Series User Manual

Section 11: Servicing Page 41
11.6 AIR ADJUSTER DISC:
COMBI 21 ONLY
Refer to Section 10.3.
11.7 RECOMMISSIONING
! WARNING !
To ensure safe and e󰀩cient operation of the boiler it is
important that re-commissioning is carried out, especially
combustion checks (%CO
2
level, ue gas temperature and
smoke number) after the boiler has been serviced. Refer to
the Commissioning instructions in Section 10.
11.5 ADJUSTING THE DIFFUSER
Adjust the di󰀨user position. Refer to Figure 10-5.
! 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 plate on the burner head as shown in
Figure 10-5.
- Locate the gauge plate 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 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 plate 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 1
mm 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.

Grant Vortex Series Specifications

General

Brand	Grant
Model	Vortex Series
Category	Boiler
Language	English