44
© Baxi Heating UK Ltd 2016
Fig. 67
Plug
Analyser Probe
14.0 Combustion & Calibration
14.1
Checking the Combustion
1. Combustion should be:-
Natural Gas
9.0% CO
2
± 0.7
Propane
10.5% CO
2
± 1.0
at all 3 fan speeds:- ‘100’ (Maximum), the Ignition Phase speed
and ‘00’(Minimum).
2. Press & together and hold for at least 6
seconds.
‘
On
’
will be displayed briefly, followed by
‘
304
’
then
the boiler CH output expressed as percentage i.e.
‘
100
’
. It may
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
2
reading.
4. Press to select the Ignition Phase Speed. A value will
be displayed, e.g.
‘33’
. Note the CO
2
reading.
5. Press again to select the Minimum Output.
‘00’
will
be displayed. Note the CO
2
reading.
6. If the CO
2
is not within the tolerances referred to above at
any of the speeds, follow the procedure in
Section 14.3
opposite
to calibrate the boiler.
7. To exit the function press
& together for 6
seconds.
14.2
Calibration Function
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.
1. The function is activated by pressing buttons and
together for 6 seconds then quickly pressing button
while
‘
On
’
is displayed. The Ignition Phase fan speed code will
then be displayed. Calibration will take approximately 5 minutes.
2. If
‘
303
’
is displayed, then the Calibration Function has not
been activated correctly. Isolate and reinstate all power sources
to the boiler and repeat the above.
3. The boiler will automatically calibrate at
‘
100
’
, the Ignition
Phase speed then
‘00’
. These represent the percentage of
MAXIMUM fan speed (i.e.
‘00’
is MINIMUM fan speed). Once
the boiler has stabilised and self-calibrated at each fan speed the
and symbols will be displayed before the next speed is
automatically set.
4. When self-calibration is complete the boiler will run at
MINIMUM fan speed (
‘00’
displayed). The following symbols
will also be displayed
flashing together at regular
intervals.
5. To exit the function press
.
‘ESC’
will be displayed and
the calibration function completed.
R
R
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.
14.3
Adjusting the
CO
2
1. Press & together and hold for at least 6
seconds.
‘
On
’
will be displayed briefly, followed by
‘
304
’
then
the boiler CH output expressed as percentage i.e.
‘
100
’
.
2. Press to select the adjustment function.
‘
0
’
will alternate
with
‘
304
’
. Using the & buttons adjust
‘
0
’
between
‘
-3
’
&
‘
3
’
.
3. Decreasing the value lowers the CO
2
, and selecting a higher
value will increase CO
2
.
4. Once the correct CO
2
reading is achieved press to
return to the fan speed selection.
5. Using or to select the next fan speed.
‘00’
indicates MINIMUM speed, the other speed (Ignition Phase) will
be indicated by, for example
‘33’
(this varies depending on
boiler model).
6. Repeat step 2. above to adjust the CO
2
.at Ignition Phase and
Minimum fan speeds. Press & together and hold
for at least 6 seconds to exit the function.
Flue Sampling
Point
Содержание Promax 24 Combi ErP
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