Grant Vortex - Switching on; Running the Boiler; Balancing the System

Section 10: CommissioningPage 40
10.5 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/O󰀨 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 fi ring.
The burner should then fi re. 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 fi rst lighting.
5. With the burner alight, check the fuel pressure. Refer to
Section 2.2 (burner settings).
6. Adjust the pressure if necessary - refer to Section 11.9
(burner components).
! 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 o󰀨 .
9. With the burner alight, re-check the fuel pressure and re-
adjust if necessary. Turn the boiler o󰀨 , 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 fl ue installations - Ensure the fl exible air inlet
tube is correctly connected to both the burner air inlet and the
fl ue system.
10.6 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 fl ue gas analyser, set to the
correct fuel, check the %CO
2
in the fl ue 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
effi ciency or conventional fl ue draught.
4. When using the test point on the cleaning cover note that
the fl ue gas temperature reading will be higher than that
measured in the fl ue thus resulting in an inaccurate e󰀩 ciency
reading. To obtain an accurate fl ue gas temperature and
e󰀩 ciency, the reading can only be measured outside
through the low level fl ue terminal (or the test point on the
conventional fl ue starter section when used).
5. For high level and vertical balanced fl ues, the reading may
be taken from the fl ue test point provided on the fl ue system.
Refer to Section 9.
6. For conventional fl ues, a test point is provided in the
conventional fl ue adaptor for fl ue draught and fl ue gas
temperature measurement. Refer to Section 9.
7. Set the %CO
2
, as indicated on the fl ue gas analyser, to
the required value as given in Section 2.2 for the boiler
concerned.
8. Adjust the burner air damper, using the hexagonal key
supplied, to achieve the required %CO
2
. Refer to Section
11.9.
9. To increase the %CO
2
:
• Turn the screw anti-clockwise. This will close down the
burner air damper and decrease the combustion air
entering the burner.
To decrease the %CO
2
:
• Turn the screw clockwise. This will open up the burner
air damper and increase the combustion air entering the
burner.
10. When the %CO
2
is set to the correct level, re-check the
smoke number if the burner air damper has been moved.
Under no circumstances must the smoke number be above
1.
! NOTE !
For safe and effi cient operation of the boiler it is essential
that the air damper is correctly set to give the required
%CO
2
in the fl ue gases.
10.7 BALANCING THE SYSTEM
1. When the boiler has been adjusted and is running
satisfactorily, balance the central heating system by adjusting
the radiator lock shield valves. Start with the radiator nearest
the boiler and adjust the valves to achieve the required
temperature drop across each radiator. If thermostatic
radiator valves have been installed, check the system
bypass.
2. Switch o󰀨 the boiler.