Chimney Sweep Function (Co Adjust); Combustion Adjustment Function (Co2%); Check Firing Rate - Baxi LUNA DUO-TEC 60 GA Installation Instructions For The Installer

9.12 Chimney Sweep Function (CO
For correct boiler operation, content of (CO2- O2) in the combustion flue must be within tolerances indicated in table below.
COMBUSTION TABLE
Nominal value
Maximum
power (100%)
Permitted value 8.7 – 9.3 5.4 – 4.3 8.7 – 9.3
Nominal value
Ignition power
(*)
Permitted value 8.2 – 9.3 6.3 – 4.3 8.2 – 9.3
Nominal value
Minimum
power (0%)
Permitted value 8.7 – 9.3 5.4 – 4.3 8.7 – 9.3
(*)
Automatically calculated from the PCB
Chimney Sweep Function enables boiler to generate maximum heating power.
After activation, boiler power % can be adjusted from minimum (0%) to maximum (100%) in DHW mode.
A. Press and hold
seconds followed by program row "303" alternating with % of boiler power.
B. Press to gradually adjust power (increments of 1%).
C. To exit press both buttons together for at least 6 seconds.
If value of CO2-O2 is different, check the electrodes and their relative distances. See Figure 11-1.
If necessary, replace electrodes and position them correctly. If problem persists, use "COMBUSTION ADJUSTMENT FUNCTION
(CO2%)". See Section 11 General Maintenance, Figure 11-1 Electrodes. If problem persists, use Section 9.8 Automatic
Calibration Function, and Section 9.9 Manual Calibration Function.
to display instantaneous flow temperature for 15 seconds.
• Press
• Use a regularly calibrated combustion analyzer for combustion analysis.
• During normal operation boiler performs combustion control cycles. In this phase CO values higher than 400 ppm
can occur for brief periods of time.

9.13 Combustion Adjustment Function (CO2%)

This function sets out to partially adjust the value of CO2%. Use the following procedure:
1.
Press buttons and
seconds followed by program row "304" alternated with the % of boiler power;
2.
After burner is lit, boiler reverts to maximum DHW power (100). When display shows "100" it is possible to partially adjust value
of CO2 %;
3.
Press and . Display shows "00" alternating with function number "304" (
4.
Press to raise or lower the amount of CO2 (from -3 to +3);
5.
Press to save new value. Power value "100" will show on display again. Boiler continues operating at maximum DHW
power.
This procedure can be used to adjust CO2 to ignition power and minimum power by pressing
6.
After saving the new value (step 5 above), press
described in step 4 of procedure (power value is a number <> 100 and <> 0). Repeat step 5 to save.
7.
Press to adjust boiler to minimum power. Wait for value of CO2 to stabilize. Go to step 4 to adjust (power value = 00);
8.
Exit function by pressing

9.14 Check Firing Rate

1.
Measure input, if a gas meter is installed in the system.
• Turn off gas to all other appliances.
• Activate some heating zones to dissipate heat.
• Set boiler on high fire using Chimney Sweep Function.
• Use ½, 1 or 2 cu ft dial on gas meter. Measure time required for two or more complete revolutions. Measure time for one or
more minutes.
• Calculate input.
240012485 REV C [06/30/2019]
Adjust)
2
Gas A
(Natural Gas) (Natural Gas)
1.48 GA
CO2 % O2 % CO2 %
9.0 4.9 9.0
8.7 5.4 8.7
9.0 4.9 9.0
and at the same time for 6 seconds. When the function is enabled, displays shows "On" for few
NOTICE
together for at least 6 seconds. When the function is enabled, displays shows "On" for a few
to set boiler to ignition power. Wait for value of CO2 to stabilize. Adjust as
and together for at least 6 seconds, see step 1.
Gas A
Gas E (LPG)
60 GA
O2 % CO2 %
4.9 10.0
5.4 – 4.3 9.5 – 10.5 6.8 – 5.2
5.4 10.8
10.3 –
6.3 – 4.3 5.5 – 4.1
11.3
4.9 10.0
5.4 – 4.3 9.5 – 10.5 6.8 – 5.2
flashes);
46
O2 %
6.0
4.8
6.0
after performing step 5 above.