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10.1 BEfORE SWitChinG On
1.
Ensure the boiler is isolated from the electrical supply and
the boiler On/Off switch is set to OFF.
2.
Check that the high limit thermostat bulb and both thermistor
sensors are correctly located in their respective pockets.
Refer to Figure 10-2. Check condition of both thermistor
cables and thermostat capillary. Ensure they are not
damaged, broken, kinked or crushed.
3.
Remove the nuts and washers securing the front cleaning
door. Withdraw the door – take care as it is HEAVY!
4.
Check that the turbulators are in position and that the ends
are vertical. Refer to Figure 11-4.
5.
Check that the baffles are in position. Refer to Figures 11-1,
11-2, or 11-3 as required.
6.
Re-fit cleaning door and check it is fitted correctly and that a
good seal is made.
7.
Unscrew the burner fixing nut (located at the top of the
mounting flange) and remove the burner from the boiler.
8.
Check/adjust the burner settings as described in Section 10.2
(burner settings).
9.
Re-fit the burner to the boiler and tighten the fixing nut. DO
NOT OVERTIGHTEN!
10. Check that the sealed system has been vented and
pressurised and there are no leaks.
11. Ensure both automatic air vents, and also the manual vent on
the flow pipe, are open.
12. Check that all fuel line valves are open.
13. Remove the plastic burner cover if it was not previously
removed.
14. Connect a combined vent manifold and pressure gauge to
the pressure gauge connection port on the oil pump. Refer to
Figure 3-5. Open the vent screw on the vent manifold to vent
the oil supply whilst the pump is running.
15. Check that all system controls are calling for heat and turn
the boiler thermostat to maximum.
Section 10: Commissioning
10.2 BURnER SEttinGS
With the burner removed from the boiler:
1.
Remove the burner head. Refer to Figure 10-3. Loosen the
three fixing screws (1) and remove head (2) from burner.
2
3
7
4
figure 10-3: Burner head, diffuser and nozzle holder
2.
Check the nozzle is correct for the required boiler output.
Refer to Table 2-2 for the correct nozzle size and type for the
required boiler output.
3.
If the nozzle needs to be replaced - remove the diffuser/
electrode assembly. Refer to Figure 10-3.
•
Using a 4 mm Allen key, loosen the diffuser fixing screw
(3) on the electrode assembly.
•
Lift diffuser/electrode assembly (5) up and off the nozzle
holder.
•
Disconnect both ignition leads (4) from the electrodes.
4.
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 OVER tiGhtEn!
5.
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 screws 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.
1
5
8
6
page 37
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