Section 10: Commissioning
Page 42
10.3
AIR ADJUSTER DISC:
21 MODEL ONLY
! NOTE !
If the VoretexBlue 21 model is to be downrated to its
minimum output of 15kW, an air adjuster disc (Grant UK
product code Z20094349) must be fitted as described
below.
This disc is NOT supplied with the boiler, but is available
free-of-charge by contacting Grant UK.
If the VortexBlue 21 is to be downrated to its minimum output, it is
essential, for correct operation of the burner, that the internal air
adjuster disc is installed and correctly set. Refer to Figure 10-5.
Air adjuster disc
Air damper assembly
1
2
Figure 10-5:
Fitting the air adjuster disc
To fit and position 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 (1) and remove the air inlet cover from
the side of the burner.
4. Remove the screw (2) from the centre of where the air
adjuster disc will be fitted.
5.
Position the disc such that the disc setting ‘B’ (corresponding
to 15kW output setting - refer to Section 2.3) is located
against the cast boss on the fan housing.
6. Replace the screw in the centre of the air adjuster disc
and tighten, ensuring that that the disc is still in the correct
position.
7.
Re-fit the air inlet cover to the side of the burner and secure
in place using the two screws (1).
8. If the other burner commissioning steps outlined in this
section have been completed, the burner can now be re-fitted
to the boiler and secured using the burner fixing nut.
10.4 SWITCHING ON
1.
Check that all system controls are calling for heat and turn
the boiler thermostat to maximum.
2. Switch on the electricity supply to the boiler.
3.
Set the boiler On/Off switch to ON. A neon on the switch
lights when it is in the ON position. The boiler will now light
automatically.
Note that the neon lights when the boiler is switched on, but
does not necessarily indicate the burner is firing.
The burner should then fire. Open the vent screw on the vent
manifold to vent the supply while the oil pump is running
4. The burner fan should start and the burner should light within
about 12 seconds. If the burner does not light and the ‘Lock-
out’ reset button on the burner lights, wait about 45 seconds
and press the reset button to restart the ignition process.
This procedure may have to be repeated several times
during first lighting.
5. With the burner alight, check the fuel pressure. Refer to
Section 2.3 (burner settings).
6. Adjust the pressure if necessary - refer to Figure A1-1 in
Appendix A1 towards the back of this manual.
! NOTE !
It is important that the oil pressure is correctly set.
7.
Operate the boiler until it reaches normal operating
temperature. Check oil supply/return pipe for leaks, rectifying
where necessary.
8.
Check the operation of the boiler thermostat. Ensure that by
turning it anticlockwise it switches the burner off.
9. With the burner alight, re-check the fuel pressure and re-
adjust if necessary. Turn the boiler off, remove the pressure
gauge and replace the plug in the pump.
10. Ensure that there are no oil leaks, replace the burner cover.
11.
On balanced flue installations - Ensure the flexible air inlet
tube is correctly connected to both the burner air inlet and the
flue system.
10.5 RUNNING THE BOILER
1. Relight the boiler and allow it to run for at least 20 minutes.
2.
Check the smoke number, if it is 0-1 then it is satisfactory.
3.
Using a calibrated electronic flue gas analyser, set to the
correct fuel, check the %CO
2
in the flue gases.
! NOTE !
To allow the boiler to be commissioned and serviced
correctly a combustion test point is provided on the front
cleaning door. Both the %CO
2
and smoke test may all be
carried out using this test point.
This test point is not suitable for measuring boiler
efficiency or conventional flue draught.
4. When using the test point on the cleaning cover note that
the flue gas temperature reading will be higher than that
measured in the flue thus resulting in an inaccurate efficiency
reading. To obtain an accurate flue gas temperature and
efficiency, the reading can only be measured outside
through the low level flue terminal (or the test point on the
conventional flue starter section when used).
5.
For high level and vertical balanced flues, the reading may
be taken from the flue test point provided on the flue system.
Refer to Section 9.
6.
For conventional flues, a test point is provided in the
conventional flue adaptor for flue draught and flue gas
temperature measurement. Refer to Section 9.
7.
Set the %CO
2
, as indicated on the flue gas analyser, to
the required value as given in Section 2.3 for the boiler
concerned.
