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Figure 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. Figure
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.
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 24.
Cleaning and pilot Maintenance
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
WARNINg
Never use needles, wires, or similar cylindrical objects to
clean the pilot to avoid damaging the calibrated ruby that
controls the gas flow.
pILOT fLAME ChARACTERISTICS
THERMOPILE
PILOT
THERMOCOUPLE
(LPG)
THERMOCOUPLE
(NATURAL)
THERMOPILE
PILOT
THERMOCOUPLE
(LPG)
THERMOCOUPLE
(NATURAL)
A
B