Cleaning The Burner - Grant Vortex Pro Internal Combi Series Installation And Servicing Instructions

11.4 CLEaninG thE BURnER

With the burner removed from the boiler:
Burner head, nozzle and diffuser/electrode assembly
1. Remove the burner head. Refer to Figure 10-3. Loosen both
fixing screws (1) and remove head (2) from burner.
2. Clean the combustion head.
3. Remove diffuser/electrode assembly. Refer to Figure 10-3.
• Using a 4 mm Allen key, loosen the diffuser fixing screw
(3) from electrode assembly.
• Lift diffuser/electrode assembly (5) up and off 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-fit the nozzle, whilst
holding the nozzle holder using a 19 mm spanner.
! CaUtiOn !
The use of an ill-fitting spanner will damage the nozzle
and could lead to an incorrect flame 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 diffuser fixing
screw and withdraw the electrode assembly. Wipe clean and
check for any cracks in the ceramic insulation. Replace if
necessary.
6. Re-fit the diffuser/electrode assembly. Refer to Figure 10-3.
• Reconnect ignition leads (4) to electrodes.
• Re-fit the diffuser/electrode assembly (5) onto the nozzle
holder lining up the fixing screw with the recess in the
nozzle holder.
• Ensure diffuser assembly is fitted down hard onto the
shoulder on the nozzle holder.
• Tighten the fixing screw (3) to secure the diffuser/
electrode assembly in place on the nozzle holder.
! nOtE !
Do not overtighten the fixing screw as this may damage
the electrode insulator.
7. Check/adjust the electrode settings. Refer to Figure 10-4.
Always check the electrode settings after replacing the
nozzle.
8. Re-fit the burner head. Refer to Figure 10-3.
• Locate the head fixing screws (5) in the countersunk
slots in the burner collar.
• Check that the small oil drip hole (on the head) is
pointing downwards.
• Tighten the two screws (1) to secure the head (2) in
position on the burner.
photocell
The photocell is a push-fit in the front of burner body. Refer to
Section 11.8 (burner components).
1. Holding the body of the photocell (4) and NOT the cable,
carefully pull the photocell out of the burner.
2. Clean the sensor end of the photocell.
3. Replace photocell back in the burner and check that it is fully
pushed in.
.
Section 11: Servicing
Burner air inlet cover
This is located on the right hand side of the burner. Refer to
Section 11.8 (burner components).
1. Unscrew and remove the two screws and remove the air inlet
cover from the burner.
2. Check inside and remove any debris, leaves, hair, fluff, etc.
from the air inlet cover and air damper..
3. Check the condition of the rubber seal around the air inlet
cover. Replace if damaged or missing.
Burner fan housing
This is located over the fan impeller. Refer to Section 11.8 (burner
components).
With the Burner air inlet cover already removed:
1. Unscrew and remove the four screws and remove the fan
housing from the burner.
2. Check and clean the fan impeller and remove any debris,
leaves, hair, fluff etc.
3. Check/clean the fan housing is clean.
4. Check the rubber seal around the fan housing. Replace if
damaged or missing.
5. Re-fit the fan housing to the burner and secure with the four
screws.
6. Check the air adjuster disc (Combi 21 only). Refer to Section
11.6 for details.
7. Re-fit the air inlet cover to the burner and secure with the two
screws.
Oil pump filter
This is located under the end cover on the oil pump. Refer to
Section 11.8 (burner components).
1. Unscrew and remove the four cap screws securing the pump
end cover.
2. Remove the filter and wash in kerosene.
3. Check the O-ring seal around the end cover. Replace if
damaged.
4. Replace the filter and end cover.
5. Re-fit the four cap screws, tightening evenly, to secure the
end cap.
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