Ranco A22-391 Control 30067439-890 cutting power to the burner

cutting power to the burner circuit to prevent heat exchanger damage or flame rollout in the event of a blower failure or restricted airflow

providing a durable "set it and forget it" solution for localized power management

which stabilizes gas measurement in demanding commercial and industrial HVAC environments

eliminating the need for extra capillary tubes that eventually leak

Ranco A22-391 Control 30067439-890 cutting power to the burnerThe Ranco A22 391 Constant Differential Control is a specialized temperature control switch engineered for high demand commercial refrigeration and freezer applications. This SPDT (Single Pole Double Throw) control is designed without an "off" position, ensuring continuous monitoring and regulation for HVACR refrigeration temperature control. With a constant differential of 8. 0F, it maintains tight thermal tolerances across its operating range. The