96
Rev 2.1
6. Enter Diagnostic Mode by pressing Next button on the Basic Panel for 3 seconds. Once in Diagnostic Mode and
press Next button until Min icon is flashing and Diag icon is solid. Unit will now be running at 10% firing rate.
7. Using the combustion analyzer, adjust the Throttle screw to achieve 30% - 45% excess air, CO is less than 100
ppm, and NO
x is less than 15 ppm at 10% firing rate. Adjust clockwise for more gas and counter-clockwise for less
gas. Make sure boiler in manual firing mode throughout the adjustment period. In manual firing mode, firing rate
value display is alternated with Outlet/DHW temperature display.
8. Press the Done button on the Basic Panel to exit the manual firing mode.
9. Readjust setpoint to normal operating setpoint.
10. Replace the aluminum protection screw on the pressure regulator.
Procedure for Atlas A Series High Efficiency Boiler equipped with Enhanced/System Operator
Interface Panel
To adjust fuel air ratio valve at high-fire (100%):
1. Turn off unit by setting the burner cutoff switch to the OFF position.
2. Remove the plastic cover over the Throttle screw.
3. Using Enhanced/System Operator Interface Panel, activate boiler demand by temporally adjusting setpoint (about
40F) above normal operating setpoint by pressing Configure → CH – Central Heat Configuration → CH
setpoint Textbox.
4. Set the burner cutoff switch to ON position to start the unit.
5. Wait for the boiler to cycle on. Burner State Run will be displayed on Summary Statue Page.
6. Enter Diagnostic Tests by pressing Diagnostics → Diagnostic Tests on the Operator Interface. Once in
diagnostic tests page, and press the Maximum button. RPM rate will be changed to reflect maximum firing rate.
Press the Start Test button. Unit will now be running at 100% firing
rate. Five minute timer will be started with press of Start Test button.
7. Using the combustion analyzer, adjust the Throttle screw to achieve
30% - 45%, CO is less than 100 ppm, and NO
x is less than 15 ppm at
100% firing rate. Adjust counter-clockwise for more gas and clockwise
for less gas. Make sure boiler in manual firing mode throughout the
adjustment period. Five minute timer will be started with press of Start
Test button.
8. Press the Stop Test button again to exit the manual firing mode.
9. Readjust setpoint to normal operating setpoint.
10. Replace the plastic cover over the Throttle screw.
To adjust fuel air ratio valve at low-fire (0%):
1. Turn off unit by setting the burner cutoff switch to the OFF position.
2. Remove aluminum protection screw on the pressure regulator.
3. Using Enhanced/System Operator Interface panel, activate boiler demand by temporally adjusting setpoint (about
40F) above normal operating setpoint by pressing Configure → CH – Central Heat Configuration → CH
setpoint Textbox.
4. Set the burner cutoff switch to ON position to start the unit.
5. Wait for the boiler to cycle on. Run state will be displayed on Summary Statue Page.
6. Enter Diagnostic Tests by pressing Diagnostics → Diagnostic Tests on the Operator Interface. Once in
diagnostic tests page, and press the Minimum button. RPM rate will be changed to reflect minimum firing rate.
Press the Start Test button. Unit will now be running at 0% firing rate. Five minute timer will be started with press
of Start Test button.
11. Using the combustion analyzer, adjust the Throttle screw to achieve
30% - 45%, CO is less than 100 ppm, and NO
x is less than 15 ppm at
0% firing rate. Adjust clockwise for more gas and counter-clockwise for
less gas. Make sure boiler in manual firing mode throughout the
adjustment period. Five minute timer will be started with press of Start
Test button.
7. Press the Done button on the Basic Panel to exit the manual firing
mode.
8. Readjust setpoint to normal operating setpoint.
9. Replace the aluminum protection screw on the pressure regulator.
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General