Relay
- Heated expansible chamber vaporizer liquid injected by thermostat (Class 236/68A)
- Auxiliary heater applied to main temperature sensing means (Class 236/68B)
- Auxiliary heater applied to control device away from main temperature sensor (Class 236/68C)
- Thermo-controlled pilot burner operates a heat motor to actuate main fuel valve (Class 236/68D)
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