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Ignitor Circuit Operation
The glo-bar ignitor circuit is made up of the following components: a gas valve with safety and main valves,
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(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).
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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.
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main coil and is essentially inoperative. Should a momentary power failure occur, the gas valve will shut
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seconds.
IGNITOR
(GLOWING RED)
DETECTOR
MAIN
SAFETY
BOOSTER
L1
N
Ignitor On
IGNITOR
(NOT GLOWING)
DETECTOR
MAIN
SAFETY
BOOSTER
L1
N
Gas Valve Open
Valves Closed
Valves Open
