A19ADB-22C Johnson Controls Temperature Control

Overview

The Johnson Controls A19ADB-22C is a heavy-duty, single-stage remote bulb temperature control engineered for reliable high-temperature sensing and over-temperature protection in commercial and industrial HVAC systems. It utilizes a liquid-filled sensing element and capillary to provide precise temperature monitoring at a distance from the control panel. This robust controller features a NEMA 1 enclosure and a “trip-free” manual reset mechanism, ensuring the device remains locked out until deliberately reset by an operator after a high-limit trip.

Features

• Trip-Free Manual Reset: Requires deliberate operator intervention to press and release the reset button before operation resumes, preventing the contacts from being blocked in a closed position.
• Liquid-Filled Sensing Element: Provides rapid, dependable response to temperature changes and repeat accuracy unaffected by barometric pressure or cross-ambient conditions.
• Direct Setpoint Adjustment: Features a convenient external knob for tool-free temperature setting adjustments in the field.
• Robust Enclosure: Housed in a compact NEMA 1 enclosure with dust-protected, snap-acting SPST contacts for long-term reliability.

Specifications

• Temperature Range: 90°F to 325°F (32°C to 163°C)
• Switch Action: SPST (Single-Pole Single-Throw), Open on Rise (Open Hi)
• Capillary Length: 8 feet (2.4 meters)
• Bulb Dimensions: 1/4 inch diameter by 5 inches length (0.25 x 5 in.)
• Electrical Compatibility: 120, 208, and 240 VAC power supplies
• Reset Type: Manual Reset

Applications

The A19ADB-22C is ideal for use as a high-limit safety thermostat and over-temperature protection control. Typical applications include commercial and industrial hot water boilers, unit heaters, duct heating systems, ovens, and process equipment where strict temperature limitation is required for safety compliance.