Grant Vortex VTXBH15/26 User Manual

Page 44 Section 11: Servicing
11.4 CLEANING THE BURNER:
RDB2.2 BX BURNERS ONLY
FOR 15-26 AND 26-46 MODELS
With the burner removed from the boiler:
Burner head, nozzle and di󰀨user/electrode assembly:
1. Remove the burner head. Refer to Figure 10-5. Loosen the
three xing screws (1) and remove head (2) from burner.
2. Clean the burner head and recirculation tube (if tted).
3. Remove di󰀨user/electrode assembly. Refer to Figure 10-5.
• Using a 4 mm Allen key, loosen the di󰀨user xing screw
(3) from electrode assembly.
• Lift di󰀨user/electrode assembly (5) up and o󰀨 the nozzle
holder.
• Disconnect both ignition leads (4) from the electrodes.
4. Replace the nozzle (8). The nozzle should always be
replaced on an annual service. Refer to Table 2-2 for the
correct nozzle size and type for the required boiler output. Do
NOT attempt to clean the nozzle.
Use a 16 mm spanner to remove/re-t the nozzle, whilst
holding the nozzle holder using a 19 mm spanner.
! CAUTION !
The use of an ill-tting spanner will damage the nozzle
and could lead to an incorrect ame pattern and poor
combustion.
! NOTE !
Ensure that the nozzle is securely tightened so that it does
not leak but do not overtighten.
5. Inspect the ignition electrodes - remove the di󰀨user xing
screw and withdraw the electrode assembly. Wipe clean and
check for any cracks in the ceramic insulation. Replace if
necessary.
6. Re-t the di󰀨user/electrode assembly. Refer to Figure 10-5.
• Reconnect ignition leads (4) to electrodes.
• Re-t the di󰀨user/electrode assembly (5) onto the nozzle
holder lining up the xing screw with the recess in the
nozzle holder.
• Ensure di󰀨user assembly is tted down hard onto the
shoulder on the nozzle holder.
• Tighten the xing screw (3) to secure the di󰀨user/
electrode assembly in place on the nozzle holder.
! NOTE !
Do not overtighten the xing screw as this may damage
the electrode insulator.
7. Check/adjust the electrode settings. Refer to Figure 10-6.
Always check the electrode settings after replacing the
nozzle.
8. Re-t the burner head. Refer to Figure 10-5.
• 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.
9. Adjust the di󰀨user position. Refer to Figure 10-7.
! 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 10-7.
• 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
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 Figure 10-7. 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.
10. Continue cleaning the other burner components as detailed
in Section 11.6

Grant Vortex VTXBH15/26 Specifications

General

Brand	Grant
Model	Vortex VTXBH15/26
Category	Boiler
Language	English