Checking combustion CO
2
• Take the case o the boiler;
• Set the boiler on full load (see Step 1)
• The CO
2
values are set by using an Allen key (2 mm), or a large flat head screwdriver,
on the screw “B”
Please observe the following rotating direction:
• Clockwise means less CO
2
• Counter clockwise means more CO
2
Step 3: Adjustment on the gas valve
Adjust the gas valve only in case the measured values lie out of the range of the values mentioned in step 1 or 2.
A
B
AFTER THIS SETTING HAS BEEN MADE, ONCE MORE TEST THE CO
2
VALUE
AT FULL LOAD AND LOW LOAD WITH THE CASE ON. SEE STEP 1 AND 2.
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