Pilot Flame Characteristics - White Mountain Hearth CIVF-25-21 Installation Instructions And Owner's Manual

Figure 15 shows a correct pilot flame pattern. The correct flame
will be blue and will extend beyond the thermocouple and ther-
mopile. The flame will surround the thermocouple and thermopile
just below the tip. A slight yellow flame may occur where the pilot
flame and main burner flame meet. Figure 16 shows an incorrect
pilot flame pattern. The incorrect pilot flame is not touching the
thermocouple or thermopile. This will cause the thermocouple or
thermopile to cool. When the thermocouple cools, the heater will
shut down.
Correct Pilot Flame Pattern
Figure 15
Incorrect Pilot Flame Pattern
Figure 16
If pilot flame pattern is incorrect, as shown in Figure 16
• See Troubleshooting, pages 20-21.
Cleaning and Maintenance/Pilot
Oxygen Depletion Sensor Pilot (Figure 17)
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
wrench.
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PILOT FLAME CHARACTERISTICS

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 17
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