Appendix B: COMPONENT TEST PROCEDURES
A. Flame Signal Check
1) The flame signal can be checked between terminal number 9 on the low voltage terminal strip and ground. A good
signal reading should be 6 VDC or greater.
2) If the signal is lower than 6 VDC, check the continuity of the ground wire between the ignitor and the junction box.
If the ground wire is suspect, replace the ground wire.
3) If the ground wire is in good condition, remove the ignitor and inspect the ceramic insulator for cracks. If none
are found, clean off any oxide deposits which formed on the electrode. If the insulator is cracked or the electrode
can not be properly cleaned, replace the ignitor. When replacing the ignitor be sure to replace the ignitor gasket as
well.
4) Other problems that can cause a low flame signal include:
• An improperly adjusted throttle (confirm that the CO2 is within the limits shown in the installation manual).
• Fouling of the burner (remove the burner and clean with compressed air).
• Low inlet gas pressure (verify that gas pressure is within the limits shown on the rating plate).
• Grounded 24VAC or sensor wiring (this problem will result in no flame voltage reading, but will normally not result
in an E02 error because there is still adequate flame current).
B. NTC Temperature Sensors
1) The supply, return, flue, and outdoor reset sensors used on the TRIUMPH are of the resistance type.
2) The Table B.1 shows the range of resistance values for these sensors at various temperatures.
3. To check a sensor, immerse it in an ice bath and read the resistant using an ohmmeter. Compare the measured resis-
tance value against the value found in Table B.1 at 32°F. The measured value should fall within the range shown in
Table B.1. If not replace the sensor.
4. Check the sensor at 212°F. This time immerse the sensor into a container of boiling water. Compare the measured
resistance value against the value found in Table B.1 at 212°F. The measured value should fall within the range
shown in Table B.1. If not replace the sensor.
5. Check the sensor at room temperature. Compare the measured resistance value against the value found in Table
B.1 for your room temperature. The measured value should fall within the range shown in Table B.1. If not,
replace the sensor.
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