A99BB-600C Johnson Controls Sensor

Overview

The Johnson Controls A19ADB-29C is a single-stage electromechanical remote bulb temperature control designed for reliable regulation in heating, ventilation, air conditioning, and refrigeration (HVAC/R) systems. It features a liquid-filled sensing element and capillary that delivers a rapid response to temperature fluctuations. Designed primarily as an operating control, this model incorporates a “trip-free” manual reset function requiring user interaction before operation resumes, ensuring enhanced safety by locking out on high temperature conditions.

Features

• Liquid-filled sensing element provides fast and precise response to temperature changes.
• “Trip-free” manual reset mechanism ensures contacts cannot be blocked in the closed position, requiring manual intervention to resume operation.
• Heavy-duty NEMA 1 enclosure protects internal components from dust and debris.
• Single-pole, single-throw (SPST) switch action engineered to open on temperature increase (open high).
• Compact and robust electromechanical design for long-term operational dependability.

Specifications

• Product Code: A19ADB-29C
• Temperature Range: 90°F to 325°F (32°C to 163°C)
• Switch Action: SPST (Open High / Normal Open)
• Differential: 1°F fixed differential
• Capillary Length: 10 feet
• Bulb Dimensions: 1/4 inch diameter by 5 inches length
• Enclosure Rating: NEMA 1
• Reset Type: Manual reset (Lockout on high)

Applications

• Ideal for use as a high-limit or operating temperature control in hot water boilers and hydronic heating systems.
• Suitable for commercial and industrial HVAC/R configurations requiring manual reset capabilities upon reaching high-temperature thresholds.
• Used in air conditioning, ventilation, and general-purpose heating environments to prevent system overheating.