48
Bryan Steam, LLC
www.bryanboilers.com
Phone: 765-473-6651
783 N Chili Ave, Peru, IN 46970 [email protected]
iii. Turn adjustment screw clockwise, a
maximum of 1/4 turn, to increase gas flow
(
decreases O
2
level
). Then allow to stabilize.
iv. Turn adjustment screw counter clockwise , a
maximum of 1/4 turn, to decrease gas flow.
(
increases
O
2
level
). Then allow to stabilize.
v. Replace brass hex cover.
WARNING
Improper adjustments to the low fire offset
adjustment can lead to rough light-offs and nuisance
flame failures.
21. Verify O
2
repeatability by commanding the
boiler to high fire and low fire as many times
as required, repeating Step 20 as necessary.
22. Once the boiler is operating within the specified
high and low fire ranges, record emissions,
flue draft, and other important data on the
installation and startup report, see Appendix C.
23. Perform tests on each of the components
listed in Table 29.
Table 28: Siemens Nominal Low Fire O
2
Free Flex Size
O
2
%
1000
7.5
1500
5.4
2000
6.3
2500
7.2
3000
7.4
Throttle Screw for
High Fire Adjustment
Offset Screw for
Low Fire Adjustment
SKP 55
Butterfly
Adjusting Nut Flat
Siemens
Figure 13: Dungs Valve
Figure 14: Siemens Valves