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the AFS-405 air pressure switch provides the versatility required for complex air-handling unit (AHU) configurations where consistent air flow proving is mandatory for system safety and performance
Field-Serviceable Construction: The actuator and valve body can be serviced independently to maximize uptime
preventing the control board from sensing the flame
the FM1STUZH-120U includes a manual 3-way override switch (ON/AUTO/OFF) for immediate testing and service bypassing without disrupting programmed cycles
the internal coil may be weakened
Johnson Controls A421AEC-01 Temperature Control 30067439-890 the AFS-405 air pressure switchThe 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
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