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Figure 38: 1 Inch Main Burner fl ame
Figure 39: Pilot Burner Flame
Figure 37: Sequence of Operation
H. Follow Operating Instructions to place boiler in
operation. See Figure 36.
I. Sequence of Operation. See Figure 37. If boiler fails
to operate properly, see Troubleshooting Tree in Section
IX: Service.
J. Check pilot burner fl ame. See Figure 39. Flame
should be steady, medium hard blue enveloping 3/8 to
½ inch of sensing probe.
K. Check main burner fl ame. See Figures 38. Flame
should have clearly defi ned inner cone with no yellow
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. Refi ll boiler.