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N
EO
T
HERM
Boilers and Water Heaters
17
5. Start the boiler and confirm it is running.
6. Press
“Start Test”.
7. Press
“Maximum Modulation”.
8. You will have 5 minutes to check and adjust High
Fire CO2. A test timer will appear on the bottom right
corner of the screen counting up to 5 minutes.
Test timer
9. After completing the High Fire testing, press
“Stop Test”.
10. Press
“Minimum Modulation
.
11. Press
“Start Test”.
You will have 5 minutes to check
and adjust Low fire CO2.
12. Repeat steps 6 through 11 a few times to confirm
High and Low fire CO2.
After CO2 has been completed press
“Stop Test”.
Gas Type
High Fire CO2
Natural
8.8 to 9.0 %
Propane
9.8 to 10 %
Refer to the manual for gas valve adjustment.
Low Fire CO2
0.5% Lower than
High Fire setting
CO2 Adjustments
