A19ABC-97C Johnson Controls Temperature Control

Overview

The Johnson Controls A19ABC-97C is a heavy-duty electromechanical utility thermostat designed for reliable temperature control across a broad range of commercial and industrial HVAC and refrigeration applications. It features a liquid-filled remote sensing bulb and capillary that provide fast response times to temperature changes. Housed in a compact NEMA 1 enclosure, this single-stage controller operates without requiring external power and switches line voltages directly.

Features

• Heavy-duty electromechanical switching action with a Single Pole Double Throw (SPDT) configuration to support both heating and cooling control.
• Liquid expansion sensing element with a copper remote bulb provides fast and highly accurate control response.
• Adjustable differential allows for precise fine-tuning of the temperature control band to suit specific system needs.
• Front-located temperature setpoint dial features a convertible design that can be field-adjusted via a knob or screwdriver slot.
• Constant differential maintained throughout the entire operating range, unaffected by cross-ambient temperature conditions.

Specifications

• Brand: Johnson Controls
• Model / SKU: A19ABC-97C
• Temperature Range: -30°F to 100°F (-35°C to 40°C)
• Switch Type: SPDT
• Differential: Adjustable
• Capillary Length: 6 feet
• Remote Bulb Length: 4 inches
• Voltage Compatibility: 120 / 208 / 240 VAC
• Reset Type: Automatic
• Enclosure Rating: NEMA 1

Applications

• Commercial refrigeration equipment such as frozen food cases, walk-in coolers, beverage chillers, and milk coolers.
• Industrial HVAC applications including unit heater control, ventilation systems, and general-purpose ambient air temperature monitoring.
• Freeze protection systems requiring dependable electromechanical temperature monitoring.
• Liquid immersion tasks when combined with a compatible bulb well assembly for tanks and pipes.