28091-8-0814
Page 20
Figures 16 and 19 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 17 and 20 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.
VFNR 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 30.
Cleaning and Maintenance/Pilot
Oxygen Depletion Sensor Pilot (Figure 18 )
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 18
VFNI, VFXV, AND VFXI PILOT
Correct Pilot Flame Pattern
Figure 19
Incorrect Pilot Flame Pattern
Figure 20
If pilot flame pattern is incorrect, as shown in Figure 20
•
See Troubleshooting, page 30.
PILOT FLAME CHARACTERISTICS
