A19AGD-18C Johnson Controls Temperature Control

Overview

The Johnson Controls A19AGD-18C is a single-stage electromechanical remote bulb temperature control designed to provide reliable operating control for cooling applications. It features a close differential and open low switch action, operating via a field-proven liquid-filled sensing element and capillary tube. This compact device functions as an open-enclosure utility thermostat, switching line voltages directly without requiring external power.

Features

• Liquid-filled sensing element ensures rapid response and high repeat accuracy
• Unaffected by barometric pressure changes or cross-ambient temperature conditions
• Close, fixed differential for precise temperature regulation
• Snap-acting contacts housed in a dust-protected enclosure
• Heavy-duty steel construction with a zinc-plated finish for durability

Specifications

• Temperature Range: 20°F to 90°F (-5°C to 32°C)
• Switch Type: SPST (Single-Pole Single-Throw)
• Switch Action: Open Low (opens on temperature drop for cooling applications)
• Capillary Length: 6 feet (1.8 meters)
• Sensing Bulb Style: 3/8 inch x 5 inch swaged bulb
• Enclosure Type: Open / no enclosure (zinc-plated base plate and frame)
• Electrical Ratings: Supports standard line voltage switching and pilot duty ratings

Applications

• Commercial refrigeration and cooling systems
• General-purpose temperature monitoring and air-side control
• Open-tank or direct immersion applications (when used with compatible packing nuts or bulb wells)
• Ventilation and HVAC/R operating control strategies