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Precision Balanced: Factory-balanced to reduce vibration
contaminated combustion air
Always verify the temperature stamping on the original part to ensure the 70°F / 80°F range matches the manufacturer's specification for that specific serial number
The gun setting gauge is used to set the exact distance between the electrode tips and the nozzle face
Maxitrol TD121 Temperature Selector 30067439-890 Precision Balanced: Factory-balanced to reduceThe Maxitrol TD121 Temperature Selector is a critical control component designed for Selectra Series 21 and 31 electronic gas modulation systems. Specifically engineered for make up air heating and indirect fired units with atmospheric burners, this remote selector provides precise setpoint management within a 55 90 degrees F range. Unlike standard thermostats, the TD121 functions as a remote setpoint adjuster, communicating directly with the A1010 or