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I. Sequence of Operation. See Figure 39. If boiler fails
to operate properly, see Troubleshooting Tree in Section
IX: Service.
J. Check pilot burner ame. See Figure 41. Flame
should be steady, medium hard blue enveloping 3/8 to
½ inch of sensing probe.
K. Check main burner ame. See Figures 40. Flame
should have clearly dened inner cone with no yellow
Figure 40: 1 Inch Main Burner ame
Figure 41: Pilot Burner Flame
Figure 39: Sequence of Operation
tipping. Orange-yellow streaks should not be confused
with true yellow tipping.
L. Check thermostat operation. Raise and lower
temperature setting to start and stop boiler operation.
M. Check ignition control module shut-off. Disconnect
pilot lead wires from gas valve. If burners do not
shutdown, determine cause of malfunction. Replace
necessary items and check operation.
N. Check low water cutoff (if so equipped).
1. Adjust thermostat to highest setting.
2. With boiler operating, open drain valve and slowly
drain boiler.
3. Main burners and pilot burner will extinguish and
blower will stop when water level drops below low
water cutoff probe. Verify limit, thermostat or other
controls have not shut off boiler.
4. Adjust thermostat to lowest setting. Rell boiler.