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iii. Turn adjustment screw clockwise, a
maximum of 1/4 turn, to increase gas flow
(decreases O
2
iv. Turn adjustment screw counter clockwise , a
maximum of 1/4 turn, to decrease gas flow.
(increases O
2
v. Replace brass hex cover.
WARNING
WARNING
Improper adjustments to the low fire offset
adjustment can lead to rough light-offs and nuisance
flame failures.
21. Verify O
repeatability by commanding the
2
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
Arctic Model
1000
1500
2000
2500
3000
Thermal Solutions, 1175 Manheim Pike, Lancaster, PA 17601 Website: www.thermalsolutions.com
Phone: 717-239-7642 Fax: 877-501-5212 Email: sales@thermalsolutions.com
level). Then allow to stabilize.
level). Then allow to stabilize.
O
%
2
7.5
5.4
6.3
7.2
7.4
2
Butterfly
Adjusting Nut Flat
Figure 14: Siemens Valves
Throttle Screw for
High Fire Adjustment
Offset Screw for
Low Fire Adjustment
Figure 13: Dungs Valve
Siemens
SKP 55
47
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