Johnson Controls A421AEC-01 Temperature Control 30067439-890 always verify system-specific flow media

always verify system-specific flow media against the manufacturer's chemical compatibility charts

Horizontal mounting would bypass the internal U-tube and inlet deflector

these filters can be washed and reused

Enhanced Combustion: Optimizes burner efficiency to reduce carbon buildup and heat exchanger stress

when used in steam applications

Johnson Controls A421AEC-01 Temperature Control 30067439-890 always verify system-specific flow mediaThe Johnson Controls A421AEC 01 is a high performance single stage electronic temperature control designed for heavy duty HVACR applications requiring precision and environmental protection. This unit features a versatile 120 240 VAC power supply and a wide temperature control range of 40? F to 212? F ( 40? C to 100? C), making it ideal for everything from walk in freezers to boiler systems. Built with a NEMA 4X watertight enclosure, the A421AEC 01 is