A19AAB-40C Johnson Controls Temperature Control

Overview

The Johnson Controls A19AAB-40C is a high-range, single-stage mechanical remote bulb temperature control designed for a wide variety of heating and general-purpose industrial, agricultural, and commercial applications. It utilizes a liquid-filled sensing element and capillary to deliver reliable, line-voltage temperature regulation without requiring external power.

Features

• Liquid-filled sensing element provides consistent and accurate operation.
• Constant differential throughout the entire temperature control range.
• Robust, compact NEMA 1 enclosure ensures suitable protection for indoor installations.
• Unaffected by cross-ambient conditions or barometric pressure changes.
• Simple mechanical design allows for highly dependable, long-term performance.

Specifications

• Temperature Control Range: 100 to 240 °F (38 to 116 °C)
• Differential Temperature: 4 °F fixed
• Switch Action: Single-pole, single-throw (SPST) – Open High (opens on temperature increase, making it ideal for heat-only applications)
• Capillary Length: 12 inches (1 ft)
• Bulb Size: 3/8 x 3-1/2 inches, copper construction
• Voltage Ratings: 120 V / 208 V / 240 V AC
• Electrical Ratings: 16.0 A Full Load at 120 VAC, 8.0 A Full Load at 240 VAC; 125 VA Pilot Duty

Applications

• Designed for temperature control in commercial, farm, and industrial heating environments.
• Suitable for HVAC/R applications including hot water heating, ventilation systems, and general industrial equipment regulation.
• Commonly used in spaces demanding consistent temperature monitoring where a simple open-on-rise mechanical control is required.