Description
The Johnson Controls A19AAT-2 is a mechanical remote bulb temperature control engineered for portable cooling applications. Featuring a rugged electromechanical design, this unit delivers reliable on/off switching at 120VAC with a single-pole, single-throw (SPST) configuration and an open-on-temperature-fall (Open Low) switching action. The automatic reset function eliminates the need for manual intervention after a temperature trip, making it well-suited for unattended or semi-automated cooling systems.
A convenient knob range adjuster allows technicians and end users to dial in the desired setpoint anywhere within the 20 to 80°F range, while the fixed 3.5°F differential ensures consistent, stable cycling without hunting. The 6-foot capillary tube provides flexible remote bulb placement, allowing the sensing element to be positioned precisely at the point of temperature measurement — away from the control body.
Key Features
- Mechanical, electromechanical switching — no external power supply required for sensing
- 120VAC operating voltage
- SPST (Single-Pole, Single-Throw) switching configuration
- Open Low switching action — opens on temperature decrease
- Automatic reset — no manual reset required after trip
- Setpoint range: 20°F to 80°F, adjustable via knob
- Fixed differential: 3.5°F for stable, consistent cycling
- 6-foot capillary tube for flexible remote bulb placement
- Designed for portable cooling equipment
Specifications
- Brand: Johnson Controls
- SKU / Model: A19AAT-2
- Voltage: 120VAC
- Switch Type: SPST
- Switching Action: Open Low (opens on temperature fall)
- Reset Type: Automatic
- Setpoint Range: 20°F to 80°F
- Fixed Differential: 3.5°F
- Capillary Tube Length: 6 feet
- Sensing Method: Remote bulb
- Adjustment: Knob range adjuster
- Application: Portable cooling
Application
The A19AAT-2 is ideal for OEM and replacement use in portable air conditioners, spot coolers, and similar portable cooling equipment where precise remote temperature sensing and reliable switching are essential. Its mechanical design provides long-term durability in demanding environments.
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