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Part number 550-110-260/0200
29
Boiler Manual
4. Check around the boiler for gas odor following
the procedure of section
7a of this manual.
Start-up — operate boiler continued7b
Figure 16 Typical pilot burner flame
Figure 17 Typical main burner flame
Check burner flames
View pilot and main flames through the inspection port
in the Air inlet box front cover.
Pilot burner flame
Proper pilot flame characteristics (see Figure 16):
1. Blue flame.
2. Inner cone engulfing pilot flame sensor.
3. Pilot flame sensor glowing cherry red.
Improper pilot flame characteristics:
1. Overfired — Large flame lifting or blowing past
pilot flame sensor.
2. Underfired — Small flame. Inner cone not engulfing
pilot flame sensor.
3. Lack of primary air — Yellow flame tip.
4. Incorrectly heated pilot flame sensor.
Main burner flame
Proper main burner flame characteristics
(see
Figure 17):
1. Yellow-orange streaks may appear (caused by dust).
Improper main burner flame characteristics:
1. Overfired — Large flames.
2. Underfired — Small flames.
3. Lack of primary air — Yellow tipping on flames
(sooting will occur).
Start-up — if boiler doesn’t start . . .7c
Check for:
1. Loose connections, blown fuse or service switch
off?
2. High limit switch set below boiler water
temperature?
3. Thermostat set below room temperature?
4. Gas not turned on at meter or boiler?
5. Incoming gas pressure less than:
5" w.c. for natural gas?
11" w.c. for propane gas?
If none of the above corrects the problem, refer to
Troubleshooting, section 11 of this manual.
26023
Spark
electrode
Inner
cone
Pilot
flame
sensor
26024
Transparent
blue flame
Inner flame
If you discover evidence of any gas leak, shut down
the boiler at once. Find the leak source with bubble
test and repair immediately. Do not start boiler again
until corrected. Failure to comply could result in severe
personal injury, death or substantial property damage.