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Page 1716937-4-0806
Figures 13 and 16 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 14 and
17 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.
VFCR-25 PILOT
Correct Pilot Flame Pattern
Figure 13
Incorrect Pilot Flame Pattern
Figure 14
If pilot flame pattern is incorrect, as shown in Figure 14
• See Troubleshooting, page 19.
Cleaning and Maintenance/Pilot
Oxygen Depletion Sensor Pilot
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 15
VFCM-25 AND VFCT-25 PILOT
Correct Pilot Flame Pattern
Figure 16
Incorrect Pilot Flame Pattern
Figure 17
If pilot flame pattern is incorrect, as shown in Figure 17
• See Troubleshooting, page 19.
PILOT FLAME CHARACTERISTICS