this mechanical thermostat features a liquid-filled sensing element that ensures precision repeat accuracy regardless of barometric pressure or cross-ambient conditions

Direct Compatibility: Engineered specifically for McDonnell & Miller RS sensors and compatible with 750B series controllers

making it highly efficient for multi-device loops on restricted power supplies

Unlike generic aftermarket boards

Can this switch be used in horizontal or upflow configurations

Johnson Controls A421AEC-01 Temperature Control Els PW 17895 this mechanical thermostat features aThe 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