The Johnson Controls A19DAC-1 is a professional-grade mechanical temperature control engineered for precision in fluid piping applications. This strap-on surface mounted controller is a staple for HVACR technicians who require a reliable solution for boiler high-limit or unit heater low-limit monitoring. Utilizing a liquid-filled sensing element, the A19DAC-1 provides consistent "repeat" accuracy unaffected by barometric pressure or cross-ambient temperature fluctuations. The unit features a single-pole, double-throw (SPDT) switch, allowing for both direct and reverse action depending on your wiring configuration. With a wide setpoint range of 100 to 240 degrees F and a 10 degree F fixed differential, it ensures stable cycling and system protection. The robust NEMA 1 enclosure and dust-protected Pennswitch contacts offer long-term durability in demanding commercial environments. For streamlined field installation, it includes adjustable mounting straps and a knob range adjuster for rapid onsite calibration without the need for specialized tools. Key Benefits: Versatile Application: Optimized for hot water riser pipes and unit heaters, providing flexible SPDT control for heating or cooling signals. Simplified Installation: The strap-on mounting design eliminates the need for system drainage or thermowells, reducing labor time. Rugged Reliability: Features a dust-protected enclosure and snap-acting contacts to ensure high-performance operation in industrial settings. Field Adjustable: Equipped with a visible scale and a field-convertible knob for intuitive setpoint management. Common Questions: Can this be used on insulated pipes? Yes, contractors should remove a 5-inch section of insulation to ensure the sensing element has direct contact with the cleaned pipe surface for accurate thermal transfer. What is the maximum ambient temperature for the housing? The A19DAC-1 housing is rated for a maximum ambient temperature of 140°F (60°C). Does it require a manual reset? No, this model is designed with an automatic reset, which restores operation once the temperature returns to the cut-in point. Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
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