Johnson Controls A19ABC-40 Utility Thermostat

The Johnson Controls A19ABC-40 is a versatile single-stage temperature control engineered for high-precision switching in commercial refrigeration, HVAC, and industrial process applications. This SPDT thermostat features a broad 30?F to 110?F setpoint range, making it a reliable solution for walk-in coolers, beverage dispensers, and general-purpose heating systems. The liquid-filled sensing element and 6-foot copper capillary allow for flexible remote bulb mounting, ensuring accurate thermal response even in remote locations. Designed for line-voltage operation at 120/208/240 Vac, it utilizes a dust-protected snap-acting switch to provide consistent performance across various electrical loads.

For contractors, the A19ABC-40 offers the durability of a NEMA 1 enclosure and the convenience of a visible knob setpoint adjustment. The adjustable differential (typically 3.5?F to 14?F) allows for fine-tuning of the cycle rate to prevent short-cycling and extend the life of compressor or heater contactors. With its automatic reset functionality and field-proven reliability, this remote bulb temperature control excels as a primary operating control in environments where barometric pressure or ambient temperature fluctuations often compromise standard thermostats.

• Universal Compatibility: Works with 120V, 208V, and 240V systems for maximum field flexibility.
• Rugged Sensing Element: The 6' capillary and 3/8" x 4" bulb provide precise mechanical thermostat tracking.
• Configurable Switching: SPDT contacts allow for both "open-on-rise" (cooling) and "close-on-rise" (heating) wiring configurations.
• Adjustable Cycling: Internal adjustable differential allows technicians to optimize system run times.
• Ease of Installation: Features a standard knob adjustment and clear scale plate for rapid setup and commissioning.

Can the A19ABC-40 be used for both heating and cooling applications?
Yes. Because it is equipped with SPDT contacts, you can wire it to open or close the circuit on temperature rise, allowing it to control either a cooling compressor or a heating element.

Does this unit require an external power source to operate the sensing element?
No. The Johnson Controls A19ABC-40 uses a liquid-filled sensing element that operates mechanically, though the switch itself handles line voltage for the connected equipment.

Is the capillary tube length adjustable?
The capillary is a fixed 6-foot length. It should never be cut or kinked, as this will destroy the liquid seal and render the control inoperable. Excess capillary should be carefully coiled and secured.

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.