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420010970304 - LP-700 Rev. 000 Rel. 002 Date 4.21.21
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If the value measured corresponds to the value given in the Table
29, max adjustment is complete. Otherwise continue the setting
procedure.
ATTENTION!! The Test Function will automatically deactivate after
30 minutes, or Test Function can be turned off manually by pressing
the RESET button.
Operation 4 - Checking the CO2
at Minimum Gas Flow (Low Fan
Speed)
With the Test Function active, press
the
button to operate the
boiler at minimum DHW power.
The
and
icons will display.
Wait 1 minute for the boiler to
stabilize before carrying out the
combustion analyses.
If the CO2 (%) reading at min gas flow
is greater than the CO2 (%) reading
at max flow, or if it is less than the
reading at max flow by more than
0.3%, adjust the gas valve following
the instructions below. Otherwise
move directly to Operation 5.
Adjusting the Gas Valve at Minimum
Gas Flow
Remove cap and adjust screw 2 by turning counter-clockwise to
reduce the CO2 level; clockwise to increase the CO2 level. Wait 1
minute after each adjustment for the CO2 value to stabilize.
WARNING! Minimum Gas Flow Adjustment is very sensitive.
If the value measured corresponds to the value given in Table 29
adjustment is complete. Otherwise continue the setting procedure.
Attention!! If the value of the CO2 at minimum power has been
changed, it is necessary repeat the adjusting at maximum gas
flow.
Operation 5 - Ending Adjustment
1. Exit Test Mode by pressing RESET.
2. Turn down the thermostat and / or stop the DHW draw-off.
For Only Heating Boiler applications reset all thermostatic
valves.
3. Check for and repair any leaks of gas.
4. Reinstall the front cover.
5. Reinstall the combustion test port -
see Figure 89.
1
3
2
4
2
2
Figure 91 - Min CO2
Adjustment