Form: 2435
Revision: 9
Free Flex Installation and Operation Manual
Date: 9-1-2017
Bryan Steam LLC, 783 N Chili Ave, Peru IN 46970
Web:
www.
bryanboilers
.com
Phone:
765-473-6651
Fax:
765-473-3074
Email:
33
20.
Menu > Operation > High/Low > High
> Back Arrow (76 password required)
21.
Once boiler has reached high fire rate,
check that O2 levels are within a safe
operating range. (4.5% to 7.0%)
22.
Adjust supply gas pressure between 4”
w.c. and 14” w.c. as measured at the ball
valve tapping outside of the boiler top
jacket panel.
23.
Adjust the O
2
level so that it is within
4.5 to 7.0 % at high fire with all jacket
doors installed and front cabinet door
closed.
a.
For best efficiency, standard O2
should be set to 4.5% to 4.6%.
b.
For boilers specified to be less than
20ppm NOx adjust the O
2
level
within 6.5% to 7.0%.
c.
For boilers specified to be less than
9ppm NOx adjust the O2 level within
7.0% to 9.0%.
Note: High Fire O
2
levels are adjusted with
the gas shutter valve located on the
outlet of the gas valve.
i.
Turn adjustment screw toward the
‘Plus (+)’ side to increase gas flow
(decrease O
2
level).
ii.
Turn adjustment screw toward the
‘Minus (-)’ side to decease gas flow
(increase O
2
level)
24.
Menu > Operation > High/Low > Low
> Back Arrow (76 password required)
25.
Verify the O
2
level is /- 0.3% of
the O2 level set at high fire with all
jacket doors installed and front cabinet
door closed. (Consult the factory for
assistance if the O2 levels are not within
+/- 0.3% from high fire to low fire.)
Warning
Improper adjustments to the low fire
offset adjustment can lead to rough light-
offs and nuisance flame failures.
26.
Verify O2 repeatability by
commanding the boiler to high fire
and low fire as many times as
required, repeating steps 20 to 26 as
necessary.
Figure 6: High Fire Adjustment on the
Main Gas Valve Regulator
27.
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.
28.
Perform tests on each of the components
listed in
Table 15
.