Johnson Controls A19DAC-1 Temperature Control

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.

• 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.

• 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.