Maxitrol TD121 Temperature Selector 30067439-890 contaminated combustion air

contaminated combustion air

5 LPM flow regulator

If the switch remains open despite normal temperatures

Precision Balanced: Factory-balanced to reduce vibration

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

Maxitrol TD121 Temperature Selector 30067439-890 contaminated combustion airThe 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