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39235-1-0219
Page 30
PILOT FLAME CHARACTERISTICS
INTERMITTANT PILOT
PILOT
SENSOR
IGNITOR
Correct Pilot Flame Pattern
Figure 27
PILOT
SENSOR
IGNITOR
Incorrect Pilot Flame Pattern
Figure 28
If pilot flame pattern is incorrect, as shown in
Figure 32.
• See Troubleshooting, pages 33 through 37.
CLEANING AND PILOT MAINTENANCE
oxygen Depletion sensor Pilot - Figures 29 and 30
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.
Millivolt Pilot
Figure 29
A
B
Intermittant Pilot
Figure 30
WARNING
Never use needles, wires, or similar cylindrical objects to
clean the pilot to avoid damaging the calibrated ruby that
controls the gas flow.