Room thermostat
First stage valve Ignition transformer
Preheater
Second stage valve
Reset
Preheater
thermostat
Pilot valve Ionization probe
Air pressure switch
or revolutions per
minute
Photocell Lockout signal
Fan Photodiode FD
The whole electrical scheme of the US gas system is shown in
.
Electrical scheme for US gas ovens
The ignition sequence could be described as shown in and listed as follow:
TGRD81 flame control board connections
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