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Figure 11 shows a correct pilot flame pattern. The correct flame will
be blue and will extend beyond the thermocouple and thermopile.
The flame will surround the thermocouple and thermopile just below
the tip. A slight yellow flame may occur where the pilot flame and
main burner flame meet. Figure 12 shows an incorrect pilot flame
pattern. The incorrect pilot flame is not touching the thermocouple
or thermopile. this will cause the thermocouple or thermopile to cool.
When the thermocouple cools, the heater will shut down.
Correct Pilot Flame Pattern
Figure 11
Incorrect Pilot Flame Pattern
Figure 12
If pilot flame pattern is incorrect, as shown in Figure 12
• See Troubleshooting, pages 18 and 19.
Cleaning and Maintenance/Pilot
Oxygen Depletion Sensor Pilot (Figure 13)
When the pilot has a large yellow tip flame, clean the Oxygen Deple
-
tion sensor as follows:
1. Clean the ODS pilot by loosening nut B from the pilot tubing.
When this procedure is required, grasp nut A with an open
wrench.
2. Blow air pressure through the holes indicated by the arrows.
This will blow out foreign materials such as dust, lint and spider
webs. Tighten nut B also by grasping nut A.
Figure 13
PILOT FLAME ChARACTERISTICS
