Final Adjustments; Adjust The Burner And Damper Assembly - Weil-McLain 4 Series Manual

sTeam series
94

Final Adjustments

Adjust the Burner and Damper Assembly

NOTICE
Make final burner adjustments using combustion
test equipment to assure proper operation. Do not
fire boiler without water. Sections will overheat,
damaging the boiler and resulting in substantial
property damage.
1 Lock flue damper OPEN See Figure 43
2 Refer to burner manual for start-up and service
3 Let burner advance to high fire. Heat boiler to
design conditions
4 Using combustion test equipment, adjust burner:
a 12% (± 50%) CO
b 9%-10% CO natural gas; CO in flue gas not to
2
exceed 50 ppm (0 01%)
c Flue gas temperature no lower than 330°F
IMPORTANT
On some applications, if draft conditions or burner
characteristics cause the burner flame pattern to
impinge on the combustion chamber wall, pinging
sounds may come from the boiler. Adjust the burner
if possible to redirect the flame. If this does not work,
contact your boiler supplier or WM Technologies
to obtain an optional combustion chamber kit. See
the parts section starting on page 59 for ordering
information.
5 Adjust the flue collar damper (Figure 43) to
ensure 0 1" W C positive pressure at test
opening Take the 0 1" W C positive pressure
reading while boiler is running at high fire rate.
6 Tighten screws to secure into position
7 Plug test opening with the 1/8" plug provided with
the flue collar and damper assembly
8 Adjust barometric draft control (when used) to
design conditions
9 Repeat steps 4-6 Make adjustments as required
550-100-157/0523
boiler manual
4
for No 2 fuel oil, 0 smoke
2
Figure 43 Flue collar damper assembly
insTallaTion
Test plug
Damper locking
cap nut
230058 230058
1
2
3
4
5
6
7
8
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