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26670-0-0110Page 22
Figure 16 show a correct pilot ame pattern. The correct ame
will be blue and will extend beyond the thermocouple. The ame
will surround the thermocouple just below the tip. A slight yellow
ame may occur where the pilot ame and main burner ame
meet. Figure 17 show an incorrect pilot ame pattern. The incorrect
pilot ame is not touching the thermocouple. This will cause the
thermocouple to cool. When the thermocouple cools, the heater
will shut down.
Correct Pilot Flame Pattern
Incorrect Pilot Flame Pattern
If pilot ame pattern is incorrect, as shown in Figure 17
• See Troubleshooting, page 24.
Cleaning and Pilot Maintenance
When the pilot has a large yellow tip ame, 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.
Warning:
Never use needles, wires, or similar cylindrical objects to
clean the pilot to avoid damaging the calibrated ruby that
PILOT FLAME CHARACTERISTICS
THERMOPILE
PILOT
THERMOCOUPLE
(LPG)
THERMOCOUPLE
(NATURAL)
THERMOPILE
PILOT
THERMOCOUPLE
(LPG)
THERMOCOUPLE
(NATURAL)
A
B