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Page 18
12409-2-0403
Figures 19 and 22 show 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. Figures 20 and 23 show 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.
VFYR PILOT
Correct appearance of pilot flame.
Figure 19
Incorrect appearance of pilot flame.
Figure 20
If pilot flame pattern is incorrect, as shown in Figure 20
• See Troubleshooting, page 20.
Cleaning and Maintenance/Pilot
Oxygen Depletion Sensor Pilot (Figure 21 )
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 21
VFYM PILOT
Correct Pilot Flame Pattern
Figure 22
Incorrect Pilot Flame Pattern
Figure 23
If pilot flame pattern is incorrect, as shown in Figure 23
• See Troubleshooting, page 20.
PILOT FLAME CHARACTERISTICS