Broad Cross-Reference: Replaces COL12849

the unit is used as packaged

Always inspect the vacuum lines for cracks before replacing the switch

maintaining a clean

leak-proof interface between the cover plate and the heat exchanger or boiler section

Johnson Controls A421AEC-02 Temperature Control 30067439-890 Broad Cross-Reference: Replaces COL12849The Johnson Controls A421AEC 02 is a heavy duty single stage electronic temperature control engineered for precision in demanding HVACR environments. This unit serves as the direct replacement for A419AEC 2 and A419AEC 2C, offering a critical upgrade for contractors maintaining refrigeration, space heating, and cooling systems. Housed in a NEMA 4X enclosure (IP66), this controller is built to withstand wash down environments and high moisture