A19ABC-39C Johnson Controls Temperature Control

Overview

The Johnson Controls A19ABC-39C is a single-stage electromechanical temperature control designed for direct immersion applications. It utilizes a liquid-filled sensing element to provide accurate heating or cooling control by switching line voltages based on temperature variations. Featuring a NEMA 1 enclosure, it is engineered for reliable, automatic recycling operation in commercial and industrial HVAC environments.

Features

• Direct immersion design with a liquid-filled sensing bulb
• SPDT (Single-Pole, Double-Throw) switch action for versatile heating or cooling wiring
• Compact, durable NEMA 1 general-purpose enclosure
• Adjustable differential that allows tailored system response
• Snap-acting contacts housed in a dust-protected enclosure for high reliability
• Precision repeat accuracy unaffected by barometric pressure or cross-ambient conditions

Specifications

• Temperature Range: 30°F to 180°F (approx. -1°C to 82°C)
• Differential: 6°F to 24°F adjustable
• Sensing Element: Style 2 bulb measuring 0.290 inch diameter by 2.573 inches length
• Switch Type: SPDT
• Enclosure Rating: NEMA 1
• Electrical Ratings: Supports line voltage switching (typically 120 to 277 VAC)

Applications

• Hot water heating system control and boiler monitoring
• Direct liquid immersion temperature monitoring in tanks and pipes
• General-purpose operating temperature control in HVAC and ventilation systems
• Commercial refrigeration applications such as walk-in boxes and beverage coolers