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© Baxi Heating UK Ltd 2012
8.0 Combustion Re-calibration
Combustion Re-calibration
Each boiler is calibrated during manufacture and set during F.F.T. (Final Function Testing). This sets the Fan and E.G.V.
(Electronic Gas Valve) to the rest of the system. Combustion at F.F.T. is set at 9.0% +/- 0.2% on N.G.
The system must be re-calibrated by the engineer to the procedure below if any of the following are changed:-
• Gas Valve
• R.D.S. (Removable Data Stick)
• Burner
• Fan
IT IS ESSENTIAL THAT THE
CALIBRATION PROCESS IS
STARTED WHEN THERE IS NO
DEMAND !
Press the ‘CH -ve’ and reset ‘R’
buttons together for 6 seconds.
‘On’ will be displayed and within 2
seconds of this showing press the ‘ip’
button.
If ‘303’ is displayed, the time window
to press the ‘ip’ button has been
missed. Power down at the fused spur
and start again.
DO NOT TURN ON THE
ANALYSER PUMP WHILST THE
BOILER IS CALIBRATING AS THE
INTERNAL CELL MAY BECOME
SATURATED !
Remove the boiler front door and
connect the manometer to the Inlet
Test point on the Gas Valve.
After the ‘ip’ button is pressed the
Ignition Fan Speed (as % of maximum)
will be displayed. Each model is
different (e.g. 33GA is ‘41’).
The boiler software will now search
for the appropriate ignition curve to
light with, usually curve 3 or 4.
To G.V. Inlet
Test Point
To G.V. Inlet
Test Point
After several seconds ‘100’ will be
displayed, indicating that the fan is a
maximum speed. It may be necessary
to put a D.H.W. demand on the
system if the temperature exceeds
85 °. Check the gas inlet pressure has
not dropped below 16mb.
The boiler will remain at ‘100’ until
stabilization is achieved - up to 3
minutes.
To G.V. Inlet
Test Point
>16mb
Combined Analyser/Manometer
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