Troubleshooting Tips | Portable Dryer Troubleshooting | |
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Fenwal Ignition System continued...
Hints
•Hearing the solenoids snap on after the
10 second purge delay means that power is coming to and through the Fenwal board. The Fenwal board is probably okay.
•If flame is sensed, the power to the sole- noids stays on but the power to the ignitor always goes off after about four(4) seconds.
•Power to the low pressure solenoid is al- ways on anytime flame is sensed. This is because the power to the low solenoid is hooked directly across terminals V1 and V2 of the Fenwal board.
•Power to the high pressure solenoids is controlled by the Plenum thermostat. One side of the solenoid is hooked to V2(neutral) and the other side is run through the nor- mally closed switch of the thermostat and then back to V1. This is how the burner is made to cycle. When the plenum is below temperature, power is run through the ther mostat to the high pressure solenoid. When temperature is reached, the thermostat opens and the high solenoid loses power.
•L2 and V2 are connected internally in the Fenwal, and they must be nuetral.
Ignitor Tips
•Make sure that the ignitors are mounted correctly through an opening in the burner skirting. Also, make sure that they are not close enough to the edges of the opening to cause a spark to jump the skirting, instead of between the ignitors.
•Be sure that the ignitor tips are no more than 1/8" apart from each other.
•Make sure that the wire connections on the ignitors are good and tight.
•On stubborn lighting burners reverse the direction the ignitor tips are facing. Instead of having the tips pointing toward the fan or burner, change the direction so the tips are facing the ex- haust end of the dryer. (This is especially true on burners with no burner cone installed (i.e. Nat- ural Gas).
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