Before Switching On; Burner Settings; Rdb2.2 Bx Burners - Grant Vortex Series Installation And Servicing Instructions

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. Remove the front casing door.
3. Remove the four screws retaining the top casing panel and
remove the top casing panel, then check that the high limit
thermostat bulb and boiler thermostat bulb are correctly
located in their respective pockets. Refer to Figure 5-1.
Ensure the store sensor is correctly located in its pocket.
Refer to Figure 10-2.
Check condition of all thermostat capillaries. Ensure they are
not damaged, broken, kinked or crushed.
4. Remove the nuts and washers securing the front cleaning
door. Withdraw the door – take care as it is HEAVY!
5. Check that the turbulators are in position and that the ends
are vertical. Refer to Figure 11-4.
6. Check that the baffles are in position. Refer to Figures 11-1,
11-2 or 11-3 as required.
7. Re-fit cleaning door and check it is fitted correctly and that a
good seal is made.
8. Unscrew the burner fixing nut (located at the top of the
mounting flange) and remove the burner from the boiler.
9. Check/adjust the burner settings as described in Section 10.2

(Burner Settings).

10. Re-fit the burner to the boiler and tighten the fixing nut. DO
NOT OVERTIGHTEN!
11. Check that the sealed system has been vented and
pressurised and there are no leaks.
12. Ensure all air vents are open. Refer to figure 5-1.
13. Check that all fuel line valves are open.
14. Remove the plastic burner cover if it was not previously
removed.
15. Connect a combined vent manifold and pressure gauge to
the pressure gauge connection port on the oil pump. See
Figure 3-5. Open the vent screw on the vent manifold to vent
the oil supply whilst the pump is running.
16. Check that all system controls are calling for heat and turn
the boiler thermostat to maximum.
10.2 BURNER SETTINGS:

RDB2.2 BX BURNERS

With the burner removed from the boiler:
1. Unscrew and remove the two screws holding the air intake
spigot to the top of the air inlet cover.
2. Remove and discard the air intake spigot and gasket.
3. Fit the slotted air intake (provided loose with the boiler) to the
top of the air intake cover and secure using one of the two
screws previously removed.
4. Remove the burner head. Refer to Figure 10-3. Loosen the
three fixing screws (1) and remove head (2) from burner.
Page 34
2
7
4
Figure 10-3: Burner head, diffuser and nozzle holder
5. 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.
6. 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.
7. 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!
8. 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.
1
5
3
8
6
Section 10: Commissioning