SBD TANK TYPE HEATERS
SERVICE HANDBOOK
STEP 16
FLAME RECTIFICATION
STEP 16. FLAME RECTIFICATION
Note: Flame rectification means that an alternating current (AC) signal is changed to a direct current (DC) signal. The pilot flame is the 'switch' which connects the pilot hood to the igniter and ground. If the pilot hood and igniter sensor had the same surface area, the flame 'switch' would conduct an AC signal. Because the pilot surface is greater than the igniter surface, the signal becomes a DC current that the module can interpret. The pilot hood must be properly grounded and the pilot flame must remain in contact with both surfaces for the flame proving signal to remain constant.
If the signal is broken for just 8 tenths of a second, the heater will cycle off.
Sparking at the pilot will continue if an insufficient signal is received by the module.
Sparking at the pilot will stop almost immediately after the ignition module senses the pilot flame.
IF | THEN | |
Sparking continues after pilot is | • | Check wire connections |
established: | • Check flame contact between hood and | |
|
| lighter |
| • Clean pilot burner surfaces | |
| • | Replace pilot assembly |
Sparking stops: | • Go to step 17. | |
Technical Training Department | 37 |
Ashland City, TN ©2003 |
