A19ABB-2C Johnson Controls Temperature Control

Overview

The Johnson Controls A19ABB-2C is a heavy-duty line voltage mechanical temperature control designed for reliable regulation in demanding HVAC/R, agricultural, and industrial applications. It features a remote liquid-filled sensing bulb and capillary tube that provide accurate temperature monitoring unaffected by cross-ambient conditions or barometric pressure changes. Housed in a compact NEMA 1 enclosure, this single-stage controller operates reliably without requiring an external power supply for sensing.

Features

• Single-pole, single-throw (SPST) snap-acting switch that opens on temperature rise (Open High)
• Constant and adjustable differential across the entire temperature range for precise system calibration
• Liquid-filled hydraulic capillary bulb sensing element ensuring long-term operational stability
• Fully mechanical operation requiring no electrical power for temperature sensing
• Visible scale with a convenient knob adjustment for setting target points easily
• Durable construction suitable for indoor single-stage heating, cooling, or ventilation systems

Specifications

• Setpoint Temperature Range: 50°F to 200°F (10°C to 93°C)
• Adjustable Differential: 6°F to 24°F (3°C to 13°C)
• Capillary Length: 10 feet
• Sensing Bulb Dimensions: 0.290-inch diameter x 2-1/2-inch length (copper)
• Switch Action: SPST, Open on Rise
• Electrical Ratings: 120V / 240V AC compatibility; Pilot Duty rated at 125 VA (24 to 600 VAC)
• Enclosure Rating: NEMA 1 (Indoor Use)
• Maximum Bulb Temperature: 240°F (116°C)

Applications

• High-range crop drying operations where remote sensing and reliable heat control are critical
• Agricultural and industrial temperature regulation inside ducts, chambers, or processing environments
• Commercial HVAC/R environmental control systems requiring independent, single-stage line voltage switching
• Indoor space heating, cooling, or industrial ventilation management safely situated within a NEMA 1 enclosure