Ignitor Circuit Operation - GE CleanSpeak GTD81ESPJMC Technical Service Manual

Ignitor Circuit Operation

The glo-bar ignitor circuit is made up of the following components: a gas valve with safety and main valves,
(resistance approximately 1400 ohms) and a booster coil (resistance approximately 580 ohms). Both coils
are needed to open the safety valve. Once energized, the safety coil alone will hold the valve open. The main
valve has a single coil (resistance approximately 1300 ohms).
L1
N
L1
N
IGNITOR
IGNITOR
(GLOWING RED) DETECTOR
(NOT GLOWING) DETECTOR
MAIN
MAIN BOOSTER
BOOSTER
SAFETY
SAFETY
Gas Valve Open
Ignitor On
When the control system calls for heat, the following circuits are energized:
1. N- through detector, ignitor, outlet control backup, inlet safety thermostats to L1
2. N- through detector, booster coil, outlet control backup, inlet safety thermostats to L1
3. N- through safety coil and outlet control backup, inlet safety thermostats to L1
When the glo-bar is heating, the booster and safety coils are both energized and will open the safety valve.
main coil and is essentially inoperative. Should a momentary power failure occur, the gas valve will shut
seconds.
Valves Closed Valves Open
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