Maxitrol TD121A Selector 30067439-890 Always verify the L275F temperature

Always verify the L275F temperature rating and manual reset requirement against your specific unit's wiring diagram

including hot chocolate

or differential pressure with a narrow switching differential for precise limit control

it is best practice for contractors to inspect the limit switches

allowing the system to resume normal operation once temperatures stabilize within the 30-degree differential

Maxitrol TD121A Selector 30067439-890 Always verify the L275F temperatureThe Maxitrol TD121A is a precision remote temperature selector engineered for high accuracy atmospheric gas fired heating systems. Designed for use with the Selectra series modulation systems, this component provides a specific setpoint range of 80F to 130F. As a veteran technician knows, maintaining the integrity of the electronic modulation signal is critical; the TD121A ensures stable communication with the amplifier to modulate the gas valve based