Grant Spira Series - Customer Handover; Flue Gas Analysis

Commissioning
51
10.9.3 Fan Box SliderPlate
If the combustion chamber draught is
too high, and adjustment of the draught
stabiliser alone cannot bring it within the
required range of 0.1 to 0.15mbar (0.04
and 0.06 in.wg), it may be necessary to
adjust the setting of the fan box slider
plate.
This is located within the fan box and is
supplied set fully closed.
Opening this slider plate allows some of
the flue gases to by-pass the flue fan,
and reduces the combustion chamber
draught. Refer to Figure 10-16.
If required, adjust the slider plate as
follows:
• With the boiler firing at maximum
output and the burner display is
showing ‘BURNER FIRING 100%’.
• Set the draught stabiliser weight
midway on the damper arm.
• Unscrew and remove the single
screw securing the end of the slider
plate arm.
• This screw is located on the right
hand side of the fan box -
immediately above the draught
stabiliser.
• Carefully pull out the end of the
slider arm whilst monitoring the
combustion chamber draught on
the draught gauge.
• When the draught gauge indicates
a draught midway between 0.1 to
0.15mbar the slider position is
correct.
• Without moving the position of the
slider plate, bend up the end of the
slider arm so the nearest hole in the
arm lines up with the threaded hole
in the fan box.
• Secure the slider arm to the fan box
using the screw previously
removed.
• If necessary make any fine
adjustment of the combustion
chamber draught by altering the
position of the weight on the
damper arm.
10.10 Flue Gas Analysis
Check the %CO
2
in the flue gases as
follows:
• Ensure the burner display is
showing ‘BURNER FIRING 100%’.
• Remove the screw from the
combustion test point, located at
the left rear corner of the rear
access cover (on the secondary
heat exchanger).
Refer to Figure 10-17.
• Insert the analyser probe a minimum
of 100mm into the test point.
• Monitor the %CO
2
for a few
minutes to see the maximum and
minimum values reached.
• The %CO
2
measured should range
between a maximum of 12% and a
minimum of 10%.
If necessary the %CO
2
may have to be
adjusted to be within these limits, as
follows:
• Access the ‘INSTAL’ (Installer)
menu in the burner control settings
and go to the ‘SETUP FAN’ sub
menu.
• Go to the ‘POWER MAXIMUM’
value and adjust the burner fan
speed using buttons 5 and 6 on the
burner control panel. Refer to
Section 9.4.
• To decrease the %CO
2
– increase
the fan speed using button 6.
• To increase the %CO
2
– decrease
the fan speed using button 5.
• To confirm the change in the
‘POWER MAXIMUM’ fan setting,
press button 4 twice, to exit the
‘SETUP FAN’ and ‘INSTAL’ menus
and return to the normal control
panel display (showing H2o and
SET temperature).
• Monitor the %CO
2
for a few
minutes to see if the maximum and
minimum values are 12% and 10%
as required.
• If necessary make a further
adjustment of the fan speed and
check the resulting %CO
2
as
described above, until it remains
within the required maximum and
minimum limits.
• Record the maximum and minimum
values on the Commissioning
Report form. Refer to Section 10.12.
On double boiler installations, the above
process – as covered in Sections 10.3
to 10.10 – must be fully carried out on
BOTH boilers.
10.11 Customer Handover
The customer/user must be informed of
the correct operation and use of their
Grant Spira wood pellet boiler
installation. This must include the
following information:
• The use of the boiler controls – how
to switch the boiler off and on, as
required. Refer customer to the
User Instructions at the back of this
manual.
Figure 10-16: Fan box slider plate
Figure 10-17: Combustion test point
!
NOTE
The normal means of setting the
correct combustion chamber draught
is by adjusting the position of the
damper weight, as detailed in
Section 10.9.2.
ONLY adjust the slider plate when
absolute necessary, i.e. when the
draught reading is too high and
beyond the adjustment range of the
damper weight.
!
NOTE
It is essential to continue to monitor
the combustion chamber draught,
whist adjusting the CO
2
in the flue
gases, and to adjust the draught
stabiliser to keep it within the
required limits. Refer to Section 10.9.