Table of Contents
Advertisement
11.5 aDjUStinG thE DiffUSER
Adjust the diffuser position. Refer to Figure 10-5.
! nOtE !
the distance between the end of the burner head and the
front face of the diffuser (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 is correct, the tongue of the
gauge plate should just make contact with the diffuser
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
diffuser, the diffuser must be 'opened' (see below).
-
If the tongue does not reach the diffuser when the steps
are in contact with the edge of the burner head, the
diffuser must be 'closed' (see below).
•
To adjust the diffuser 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 diffuser): rotate the
knob clockwise - indicated as '+' on the knob.
-
To decrease distance D (to close the diffuser): rotate the
knob anti-clockwise - indicated as '-' on the knob.
! nOtE !
One full rotation of the adjustment knob is approximately 1
mm of diffuser movement.
! nOtE !
It is essential that the final position of the diffuser is
checked, using the gauge plate provided with the boiler
and the diffuser adjusted as necessary to achieve the
required distance D.
page 44
11.6 aiR aDjUStER DiSC – COMBi
21 OnLY
The Riello RDB 2.2 BX burner fitted to this boiler 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 10-6.
To access the air adjuster disc:
1.
Ensure the boiler is isolated from the electrical supply.
2.
Remove the burner fixing nut (located at the top of the
mounting flange) 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.
The air adjuster disc is mounted on the fan housing. It should
be fixed in position 'C' – i.e. with the cut-out marked 'C'
located against the moulded boss on the fan housing. Refer
to Figure 10-6.
5.
If the disc is not set to position 'C' it must be re-positioned as
follows:
•
Remove the screw from the centre of the air shutter disc.
•
Re-position the disc so that the cut-out 'C' is located
against the moulded boss on the fan housing.
6.
Replace the screw in the centre of the air shutter disc and
tighten.
7.
Re-fit the air inlet cover to the side of the burner and secure
in place using the two screws.
11.7 RECOMMiSSiOninG
! WaRninG !
To ensure safe and efficient operation of the boiler it is
important that recommissioning is carried out, especially
combustion checks (%CO
smoke number) after the boiler has been serviced. Refer to
the Commissioning instructions in Section 10.
level, flue gas temperature and
2
Section 11: Servicing
Hide quick links:
Advertisement
Table of Contents
