Johnson Controls A19ABC-36 Temperature Control

The Johnson Controls A19ABC-36 is a professional-grade mechanical temperature control designed for heavy-duty HVAC and refrigeration applications. Built with a single-pole, double-throw (SPDT) switch action, this remote bulb temperature control provides versatile terminal connections for both heating and cooling equipment. It operates across a wide voltage range of 24 to 277Vac, making it a reliable choice for commercial refrigeration temperature control and industrial process monitoring. The unit features an automatic reset and a setpoint range of -30 to 100 degrees F, ensuring precise regulation in demanding environments.

Engineered for high-accuracy sensing, the A19ABC-36 includes a 20-foot capillary length paired with a 3/8-inch x 4-inch sensing bulb. The adjustable differential, ranging from 3 to 12 degrees F, allows technicians to fine-tune cycles to prevent equipment short-cycling. This model includes a convertible range adjuster, providing the flexibility to use either an external knob or a concealed screwdriver slot for setpoint changes. Notably, the A19ABC-36 is the direct replacement for A19ABC-37, making it the essential industrial thermostat replacement for legacy Penn or Johnson Controls installations.

Key Benefits for Technicians:

• Broad Compatibility: Multi-voltage SPDT switching handles 24V, 120V, 208V, 240V, and 277V circuits without internal reconfiguration.
• Precision Sensing: The liquid-filled sensing element maintains a constant differential across the entire temperature scale.
• Extended Reach: A 20' capillary enables remote mounting of the control box away from the evaporator or heating source.
• Rugged Enclosure: NEMA 1 high-impact plastic cover protects internal mechanical thermostat components from site debris.

Common Questions:

How do I wire this for a cooling application?
For cooling (close on temperature rise), connect the hot lead to the "Common" terminal and the load to the terminal that closes when the temperature exceeds the setpoint. Check the internal wiring diagram for specific terminal numbering.

Can the probe be submerged in liquid?
Yes, the sensing bulb can be submerged directly or used in a bulb well (sold separately) for high-pressure tank or pipe applications. Ensure the capillary is protected from kinks or sharp bends during installation.

Does this unit require a separate power supply?
No, this is a mechanical temperature control. It utilizes the physical expansion of the liquid-filled element to trip the switch, requiring no external power to the control itself, though it switches the line or pilot duty voltage to your load.

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.