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Page 14 16934-3-0806
Figure 7 shows a correct pilot flame pattern. The correct flame
will be blue and will extend beyond the thermocouple. The
flame will surround the thermocouple just below the tip. A slight
yellow flame may occur where the pilot flame and main burner
flame meet. Figure 8 shows an incorrect pilot flame pattern. The
incorrect pilot flame is not touching the thermocouple. This will
cause the thermocouple to cool. When the thermocouple cools,
the heater will shut down.
Correct appearance of pilot flame.
Figure 7
Incorrect appearance of pilot flame.
Figure 8
If pilot flame pattern is incorrect, as shown in Figure 8
• See Troubleshooting, page 17.
Cleaning and Maintenance/Pilot
Oxygen Depletion Sensor Pilot (Figure 9)
When the pilot has a large yellow tip flame, clean the Oxygen
Depletion 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 end
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 9
Warning:
Never use needles, wires, or similar cylindrical objects to
clean the pilot to avoid damaging the calibrated ruby that
controls the gas flow.
PILOT FLAME CHARACTERISTICS