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IMPORTANT: DO NOT insert the Analyser
Probe into the Test Point immediately. This will
prevent saturation of the analyser.
During the Calibration Function the combustion
ratio may increase for a short time while the
boiler performance is optimised.
The person carrying out a combustion
measurement should have been assessed as
competent in the use of a flue gas analyser and
the interpretation of the results.
The flue gas analyser used should be one meeting
the requirements of BS7927 or BS-EN50379-3
and be calibrated in accordance with the analyser
manufacturers' requirements.
Flue Sampling
Point
Plug
Analyser Probe
14.3
Adjusting the
CO
1. Press
&
'On'
seconds.
will be displayed briefly, followed by
the boiler CH output expressed as percentage i.e.
2. Press
to select the adjustment function.
'304'
with
. Using the
'-3'
'3'
between
&
.
3. Decreasing the value lowers the CO
value will increase CO
.
2
4. Once the correct CO
2
return to the fan speed selection.
5. Using
or
indicates MINIMUM speed, the other speed (Ignition Phase) will
be indicated by, for example
boiler model).
6. Repeat step 2. above to adjust the CO
Minimum fan speeds. Press
for at least 6 seconds to exit the function.
© Baxi Heating UK Ltd 2017
Fig. 70
Air Sampling
Point
2
together and hold for at least 6
'304'
'100'
.
'0'
will alternate
'0'
&
buttons adjust
, and selecting a higher
2
reading is achieved press
to
to select the next fan speed.
'33'
(this varies depending on
.at Ignition Phase and
2
&
together and hold
14.0 Combustion & Calibration
14.1
1. Combustion should be:-
at all 3 fan speeds:- '100' (Maximum), the Ignition Phase speed
and '00'(Minimum).
2. Press
seconds.
the boiler CH output expressed as percentage i.e.
be necessary to open one or more hot taps in order to maintain
the boiler at full rate.
3. Insert the analyser probe and once stabilised note the CO
reading.
4. Press
be displayed, e.g.
5. Press
be displayed. Note the CO
6. If the CO
any of the speeds, follow the procedure in Section 14.3
opposite to calibrate the boiler.
7. To exit the function press
seconds.
14.2
IMPORTANT: Do not commence the Calibration Function
whilst the burner is lit ! The case front panel MUST be fitted.
NOTE: To obtain an accurate measurement on smaller
capacity systems it may be necessary to open one or more
hot taps in order to maintain the boiler at full rate.
then
1. The function is activated by pressing buttons
R
while
then be displayed. Calibration will take approximately 5 minutes.
'303'
2. If
been activated correctly. Isolate and reinstate all power sources
to the boiler and repeat the above.
3. The boiler will automatically calibrate at
Phase speed then
MAXIMUM fan speed (i.e.
'00'
the boiler has stabilised and self-calibrated at each fan speed the
and
automatically set.
4. When self-calibration is complete the boiler will run at
MINIMUM fan speed (
also be displayed
intervals.
5. To exit the function press
the calibration function completed.
Checking the Combustion
Natural Gas 9.0% CO
2
Propane 10.5% CO
± 1.0
2
&
together and hold for at least 6
'On'
will be displayed briefly, followed by
to select the Ignition Phase Speed. A value will
'33'
. Note the CO
2
again to select the Minimum Output.
reading.
2
is not within the tolerances referred to above at
2
&
Calibration Function
together for 6 seconds then quickly pressing button
'On'
is displayed. The Ignition Phase fan speed code will
is displayed, then the Calibration Function has not
'00'
. These represent the percentage of
'00'
is MINIMUM fan speed). Once
symbols will be displayed before the next speed is
'00'
displayed). The following symbols will
flashing together at regular
'ESC'
R
.
± 0.7
'304'
then
'100'
. It may
2
reading.
'00'
will
together for 6
and
'100'
, the Ignition
will be displayed and
43
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