31
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.
10.3 Running the Boiler
1. Relight the boiler and allow it to run
for at least 20 minutes.
2. Check the smoke number, if
satisfactory check the CO2. Set the
CO2 to the value given in Section
2.3 for the boiler concerned.
3. Use the hexagonal key supplied to
adjust the burner air damper (see
Figure 3-6) as required. Turning
the screw anti-clockwise closes
the damper and increases CO2
level, turning the screw clockwise
opens the damper and reduces
CO2 level.
4. Re-check the smoke number if the
damper has been moved. Under
no circumstances must the smoke
number be above 1.
5. Check the flue gas temperature by
placing the combustion analyser in
the low level flue terminal (or into
the test point on the starter elbow if
either the Green system or Hybrid
system is used).
10.4 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 by-pass.
2. Switch off the boiler.
10.5 Completion
1. With the system hot, check
again for leaks, rectifying where
necessary.
Drain the system while it is hot to
complete the flushing process.
Refill and vent (and pressurise if a
sealed system) the system.
2. A suitable central heating system
inhibitor must be added to protect
the system against the effect of
corrosion.
3. A suitable antifreeze should be
used to prevent damage to the
boiler in areas where electrical
power failure can occur in winter
months.
4. Replace the top, front and rear
panels as necessary.
If the boiler is to be left in service with
the User, set the controls and room
thermostat (if fitted) to the User’s
requirements.
If the boiler is not to be handed over
immediately, close the boiler fuel supply
valve and switch off the electricity
supply.
To allow the boiler to be commissioned
and serviced correctly a combustion
test point is provided on the front
cleaning door.
The CO2 and smoke test may all be
carried out using this test point.
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 elbow when
fitted - with all the casing panels fitted.
10.6 Air Adjuster Disc - 15/21
only
To adjust the 15/21 air adjuster disc
when downrating - See Figure 10-2.
1. Ensure the boiler is isolated from
the electrical supply.
2. Remove the burner from the boiler.
3. Undo the two screws and remove
the air inlet cover from the side of
the burner.
4. The secondary air shutter disc
is factory set in position ‘C’ – i.e.
with the cut-out marked C located
against the die-cast boss on the
fan housing - suitable for outputs
of 18.3 and 21 kW only. See Figure
10-2.
5. Remove the screw from the
centre of the air shutter disc, and
re-position the disc such that the
cut-out ‘B’ (corresponding to 15
kW output setting – See Section
2.3) is located against the cast
boss on the fan housing. Replace
the screw in the centre of the air
shutter disc and tighten.
6. Re-fit the air inlet cover to the side
of the burner and reassemble in
reverse order.
!
NOTE
Final combustion readings can
only be measured outside through
the low level flue terminal (or the
test point on the conventional flue
starter elbow when used) with all
the casing panels fitted.
!
NOTE
It is important that the air damper is
correctly set.
!
NOTE
After commissioning the boiler
complete the Commissioning Report
in the front of this manual and the
OFTEC CD/11 commissioning
report.
Leave the top copy with the User
and retain the carbon copy.
!
CAUTION
If there is any possibility of the
boiler being left during frost
conditions, then the boiler and
system should be drained.
Alternatively, a suitable antifreeze
should be used.
!
NOTE
The test point is not suitable for
measuring boiler efficiency or
conventional flue draught.
Figure 10-2: 15/21 air adjuster disc at
position ‘C’
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