Bradford White Brute BNTH Installation And Operation Instructions Manual page 55

Brute
BOILERS AND VOLUME WATER HEATERS
Auto at the end of the test.
Manual in Run -
The Manual in Run control will only set the fan
speed when the control has proven flame and the
unit has entered the Run mode.
Manual in Run and Standby -
Using this setting, the manual control will set the
fan speed whether the boiler is operating or not.
For this test, select Manual in Run.
8. Type in a value for high fire RPM, which can be
found on the 'Modulation Configuration' screen
(see Section 8.7.7). (The actual RPM will not go
this high – the control will limit the fan speed to
the maximum set at the factory.)
By using the manual control, and entering a high
RPM value, this forces the burner to run at full
combustion so you can adjust the gas valve for the
correct CO output.
2
Figure 41 shows the adjusting points on the gas
valve. Adjust the High Fire screw to get the
proper CO level for high fire. See Table 14 and
2
Table 15. To raise the high fire CO
High Fire adjustment screw counter-clockwise.
To lower the high fire CO
clockwise.
9. Repeat step 8, except this time set the fan speed
RPM to 1200rpm. (Again, the actual RPM will not
go this low – the control will limit the fan speed to the
minimum set at the factory.) This will force the boiler
to operate in low fire. Adjust the Low Fire screw so
the CO matches Table 14 and Table 15.
2
To raise the low fire CO
adjustment screw clockwise. To lower the low fire
CO , turn the screw counter-clockwise.
2
10. The adjustment you made for the Low Fire setting
could affect the High Fire setting, so you need to
re-check the High Fire setting. Go back to the
Operations screen and set the Firing Rate back
to high fire. The CO
level listed in Table 14 and Table 15. If the CO
not correct, repeat the steps listed above.
11. Set the Firing Rate back to 1200 RPM, and re-
check the CO during Low Fire.
2
12. Once the CO values are correct for both High Fire
2
and Low Fire, go back to the Operation screen and
select Automatic operation. At this point, you have
set up the burner for this boiler.
level, turn the
2
level, turn the screw
2
, turn the Low Fire
2
should still be about at the
2
is
2
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