Verify Input Firing Rate - Beckett CG15 Manual

B) At burner start-up - Note, as soon as the burner lights,
be prepared to adjust the butterfl y valve to set the low fi re
rate adjustment.
1. Monitor the fl ame through the observation port. If
it appears to be too rich (yellow-orange fl ame),
move the butterfl y valve shaft slot setting toward a
more vertical position. (This adjustment is made by
turning the nut holding the spring-loaded swivel on
the butterfl y valve arm. If insuffi cient adjustment is
available by this method the butterfl y valve shaft can
be repositioned in the arm. Care must be taken to
make only small changes.)
2. Use a fl ue gas analyzer to check the fl ue gas ratings
for O and CO. Your target should be 4% O
2
should be well below 50 PPM. (Note that the CO is
usually near 0 at 4% O
3. If the O and CO levels are not on target, turn the
2
low fi re adjustment nut as required to meet the target
listed in Step 2.
4. Check the low fi re rate. Either clock the meter or
compare the manifold pressure drop to factory
standards. Adjust the low fi re cam setting in the
damper motor (if necessary refer to the Initial Air
Setting procedure described previously) and the
butterfl y valve shaft slot position as described in
Step 1. Refer to Step 2 in this procedure and double
check the O and CO readings.
2
5. When low fi re is set, use the modulation controller to
manually step the burner up to its high fi re rate.
6. Check fl ue gas O and CO. Your target should be
2
3% O . CO should be well below 50 PPM, and is
2
usually near 0 for that O
pressure as required to meet the target.
7. Check the high fi re rate and adjust the high fi re cam
setting and regulated gas pressure as required to
meet the target. (If necessary, refer to the Initial Air
Setting procedure described previously.)
8. Using the modulation controller, manually step the
burner back down to low fi re and verify the O
ratings. If the high fi re adjustments were signifi cant
they may have affected the low fi re settings as well.
Refer to Step 4 in this procedure to make adjustments
as necessary.
9. Using the modulation controller, manually step the
burner through its range, stopping at several points
to check O and CO measurements.
2
10. After you are satisfi ed with the modulation linkage
adjustments secure all linkage fasteners and
continue the start-up procedure.
CG15, CG25, CG50 Burner Manual
and CO
2
.)
2
. Adjust the regulated gas
2
and CO
2
It is acceptable for a burner with
linkage control of the fuel to show
2% variation in O through the range as long as O
2
above the target points. If the O
points it may lead to a CO problem. Moving the damper
arm position on the damper shaft changes mid-range O
Loosening the clamping screws and moving the swivel
end of the arm downward increases midrange O
decreases it. This change will affect the low fi re O
and you'll need to re-set it.

Verify Input Firing Rate

1. Clock the meter, correct for pressure and termperature
to get SCFH and calculate the input fi ring rate.
Compare the calculated rate to the specifi ed input
for the boiler found on the specifi cation sheets and
on the rating plates for the burner and boiler. Do not
exceed the specifi ed maximum input for the boiler.
2. Attach a manometer to the manifold test port, clock
the meter, and adjust the regulated pressure until the
specifi ed input level is achieved. Refer to Table 3.
3. Be sure to set the breech or furnace pressure to the
correct value, since this will have an effect on the
manifold pressure.
Section: Start the Burner
stays
2
drops below the target
2
.
2
, upward
2
setting,
2
23