Weil-McLain 78 - Manual (Page 25)

• Installation • Start-Up • Maintenance • Parts
Make Final Adjustments
14a
To fill water boilers:
1. Close manual air vents and drain cocks.
2. Fill to correct system pressure. Correct pressure
will vary with each installation.
3. Starting on lowest floor, open air vents one at a
time until water squirts out. Close vent. Repeat
with remaining vents.
4. Refill boiler to correct pressure.
To fill steam boilers:
1. Do not fill (except for leakage test) until boiler
is ready to be fired.
2. Fill to normal waterline, halfway up gauge
glass.
3. Recommend boiler water pH 7.0 to 8.5.
Adjust burner and breeching damper:
Make final burner adjustments
using combustion test equipment
to assure proper operation. Do
not fire boiler without water.
Sections will overheat, damaging
boiler and resulting in severe
property damage.
1. Lock open breeching damper.
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
for:
a. 12% (± 1/4%) C0
2
for No. 2 fuel oil,
0 smoke.
b. 9 - 10% C0
2
natural gas, CO in flue gas to
not exceed 100 ppm (0.01%).
5. Adjust breeching damper to assure 0.1" W. C.
positive pressure at test opening. Secure
damper.
6. Adjust barometric draft control, when used, to
design conditions.
7. Check per steps 4 through 6. Adjust as
required.
8. Plug test opening with 1/8" brass plug.
Part No. 550-141-705 25
Figure 29 Breeching Damper Adjustment
Test Plug
Lock
(Slide down to
open damper)
Breeching
damper