98
420012001500 - 03182024 - Rev. 04
Part 11 - Start-Up
OPERATION 5
ENDING ADJUSTMENT
1. Exit Burner Test by pressing ESC.
2. Turn down the thermostat and / or
stop the DHW draw-off.
3. Check for and repair any leaks of
gas.
4. Reinstall the front cover.
5. Reinstall the combustion test port -
see Figure 91.
09/28/2023
Single Boiler
Status
Demand
Outlet:
Inhibited
No heat generation
Max Power
F.Signal 255
95 °F
100 %
Power:
66°F
10:36
Min Power
Adjusting the Gas Valve at Min Power (10%)
Remove
cap and adjust screw 2 by turning counter-clockwise to
reduce the CO
2
level; clockwise to increase the CO
2
level
(Note: total adjustment should not
exceed 1/4 of a turn from factory
setting). Wait 1 minute after each
adjustment for the CO
2
value to
stabilize.
WARNING! MIN POWER
ADJUSTMENT IS VERY SENSITIVE
(total adjustment should not exceed
1/4 of a turn from factory setting).
If the value measured corresponds to
the value given in Table 43 adjustment
is complete. Otherwise continue the
setting procedure.
ATTENTION!! IF THE VALUE OF THE CO
2
AT MIN POWER HAS BEEN
CHANGED, IT IS NECESSARY REPEAT THE ADJUSTMENT AT MAX
POWER.
2
Figure 108 - Min Power
CO2 Adjustment
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