PILOT FLAME CHARACTERISTICS
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.
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