PILOT FLAME CHARACTERISTICS
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.
THERMOPILEPILOT
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.
THERMOCOUPLE THERMOCOUPLE
(LPG)(NATURAL)
Correct Pilot Flame Pattern
Figure 16
BA
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.
THERMOPILEPILOT
THERMOCOUPLE THERMOCOUPLE
(LPG)(NATURAL)
Incorrect Pilot Flame Pattern
Figure 17
If pilot flame pattern is incorrect, as shown in Figure 17
•See Troubleshooting, page 24.
Page 22 |
