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Page 1721565-3-0906
Figure 18 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 19 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.
VFDR (Series) PILOT
Correct Pilot Flame Pattern
Figure 18
Incorrect Pilot Flame Pattern
Figure 19
If pilot flame pattern is incorrect, as shown in Figure 19
• See Troubleshooting, page 19.
Cleaning and Maintenance/Pilot
Oxygen Depletion Sensor Pilot (Figure 20)
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 20
PILOT FLAME CHARACTERISTICS