Baxi Duo-tec - Combustion Test (CO2%); Combustion Adjustment Function (CO2%); Gas Valve and Conversion; Gas Conversion Methods

35
I N S TA L L E R S e c t i o n ( e n )
7733595 (01-05/19)
12.4 COMBUSTION TEST (CO
2
%)
For correct boiler operation, the content of (CO
2
- O
2
) in the combustion fumes must observe the tolerances indicated in the
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2
- O
2
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G20 G31
CO
2
% O
2
% CO
2
% O
2
%
0D[LPXPSRZHU
Nominal value 8.7 5.4 10.0 6.0
Permitted value 8.2 - 9.3 6.3 - 4.3 9.5 - 10.5 6.8 - 5.2
,JQLWLRQSRZHU
Nominal value 8.7 5.4 10.8 4.8
Permitted value 8.2 - 9.3 6.3 - 4.3 10.3 - 11.3 5.5 - 4.1
0LQLPXPSRZHU
Nominal value 8.8 5.2 10.0 6.0
Permitted value 8.2 - 9.3 6.3 - 4.3 9.5 - 10.5 6.8 - 5.2
The
CO
2
/O
2
values are with the cover closed.
The combustions analisys shall be done using an analyzer regularly calibrated.
During normal operation the boiler performs combustion control cycles. In this phase, CO values higher than 1000 ppm can
occur for brief periods of time.
COMBUSTION ADJUSTMENT FUNCTION (CO
2
%)
This function sets out to partially adjust the value of CO
2
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• Press buttons
and WRJHWKHUIRUDWOHDVWVHFRQGV:KHQWKHIXQFWLRQLVHQDEOHGWKHGLVSOD\VVKRZV³On´IRUDIHZ
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• $IWHUWKHEXUQHULVOLWWKHERLOHUUHYHUWVWRPD[LPXP'+:SRZHU:KHQWKHGLVSOD\VKRZV100LWLVSRVVLEOHWRSDUWLDOO\
adjust the value of CO
2
%
• press
7KHGLVSOD\VKRZV00DOWHUQDWLQJZLWKWKHIXQFWLRQQXPEHU304 ÀDVKHV
• press
WRUDLVHRUORZHUWKHDPRXQWRICO
2
(from -5 to +5).
• press  WR VDYH WKH QHZ YDOXH DQG YLHZ WKH SRZHU YDOXH  RQ WKH GLVSOD\ DJDLQ WKH ERLOHU FRQWLQXHV RSHUDWLQJ DW
PD[LPXP'+:SRZHU
This procedure can also be used to adjust the quantity of CO
2
to the ignition power and to the minimum power by pressing
after point 5 of the procedure described above.
• $IWHUVDYLQJWKHQHZYDOXHSRLQWRIWKHSURFHGXUHSUHVV
to take the boiler to its ignition power. Wait for the value of
CO
2
WRVWDELOLVHDQGWKHQDGMXVWDVGHVFULEHGLQSRLQWRIWKHSURFHGXUHWKHSRZHUYDOXHLVDQXPEHU!DQG!WKHQ
save (point 5).
• press
again to take the boiler to minimum power. Wait for the value of CO
2
to stabilise and then adjust as described in
SRLQWRIWKHSURFHGXUHSRZHUYDOXH 
• to exit the function, press the buttons for at least 6 seconds as described in point 1.
13. GAS VALVE
This appliance does not require any mechanical adjustment on the valve. The system ensures electronic auto-adaptation.
Gas valve key
Pi
Gas supply inlet pressure tap
13.1 GAS CONVERSION METHODS
Only an Authorised Technical Assistance Service can convert boiler operation from NATURAL GAS to LPG or vice-versa. To
perform calibration, set parameter P02 as described in the PARAMETER SETTINGS section. Lastly, check the combustion
parameters as described in the SPECIAL FUNCTIONS - CHECKING COMBUSTION PARAMETERS section.
When the gas change is completed the boiler data plate must be amended to indicate the new gas data.
Pi