34
Multi Pass Oil Boilers
5 - COMMISSIONING
Fig. 25 - EOGB Sterling 90 burner
Nozzle
adjustment
Air shutter
adjustment
Control cover plate
7
With the burner alight, check the fuel pressure.
Refer to the Technical Information, Sections 2.2
and 2.3. Adjust the pressure if necessary - see Fig.
6 or 8. Note that the 'Boiler On' neon lights when
the boiler is switched on, but does not necessarily
indicate the burner is firing, (140/160 and 160/200
models do not have a 'Boiler On' neon).
8
Operate the boiler until it reaches normal operating
temperature. Check oil supply/return pipe for leaks,
rectifying where necessary.
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 a
Having ensured that there are no oil leaks, replace
the burner cover. Ensure the flexible air tube is
connected to the burner (balanced flue models).
b
Replace the plinth to the Kitchen model (if
removed). Locate the left hand side over the
locating stud and locate the slot in the right hand
side over the screw previously loosened. Tighten
the fixing screw.
11 Relight the boiler and allow it to run for 20 minutes
then check the following:-
CO
2
level, Flue gas temperature and Smoke
Number. Refer to the Technical Information in
Sections 2.2 and 2.3.
A flue gas sampling test point is provided in the
cleaning door on the front of the boiler.
Note: The flue gas temperature measured using the
cleaning door test point is approximately 25°C
higher than at the the flue.
12 Check the smoke number, if satisfactory check the
CO
2
.
Riello RDB burner: Use the hexagonal key
supplied to adjust the burner air damper (see Fig.
21) as required. Turning the screw anti-clockwise
closes the damper and increases CO
2
level, turning
the screw clockwise opens the damper and reduces
CO
2
level.
EOGB Sterling 90 burner: Adjust the burner air
regulator, to gain access remove the controls cover
plate, see Fig. 25. Turning the adjustment screw (4
mm allen key) anticlockwise (towards -) closes the
damper and increases CO
2
level, turning the
adjustment screw clockwise (t) opens the
damper and reduces CO
2
level. Replace the cover
plate.
Re-check the smoke number if the air damper has
been moved.
Under no circumstances must the smoke number be
above 1.
A suitable position for the air damper is one which
gives 1% less CO
2
than that which has a smoke
number of 1.
Note: It is important that the air damper is
correctly set.
13 Check the flue gas temperature.
14 Check the boiler overheat thermostat by removing
the boiler thermostat phial (the shorter one for
Kitchen models) from the pocket in the top of the
boiler shell. The boiler should switch off on the
overheat thermostat. Replace the phial. Unscrew
and remove the plastic cap covering the reset
button, press the reset button and replace the cap.
15 Replace the case top.
16 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.
17 Switch off the boiler.
