Description
Overview
The Johnson Controls A19ABC-11 is a mechanical hot water immersion temperature control engineered for reliable, precise temperature management in hydronic heating and hot water systems. Designed for direct immersion into a pipe or vessel via its 1/2″ NPT fitting, this control monitors water temperature and switches loads automatically — making it an ideal solution for boilers, hot water heaters, and hydronic distribution systems.
Key Features
- Wide voltage compatibility: 24 to 277Vac — suitable for both low-voltage and line-voltage applications
- SPDT (Single-Pole, Double-Throw) switching action for versatile circuit control
- Open High (R-B): contacts open on temperature rise
- Opens Low (R-Y): contacts open on temperature fall
- Automatic reset — restores normal operation once temperature returns to within setpoint range
- Broad setpoint range: 100°F to 240°F for diverse hot water and hydronic applications
- Adjustable differential: 6°F to 24°F, allowing fine-tuned control over switching hysteresis
- 1/2″ NPT immersion fitting for direct pipe or tank installation
- Mechanical design — no electronics to fail, offering long-term durability in demanding environments
Specifications
- Model: A19ABC-11
- Brand: Johnson Controls
- Control Type: Mechanical, Immersion Temperature Control
- Voltage Range: 24 to 277Vac
- Switch Action: SPDT
- Action on Rise (R-B): Open High
- Action on Fall (R-Y): Opens Low
- Reset Type: Automatic
- Setpoint Range: 100°F to 240°F
- Adjustable Differential: 6°F to 24°F
- Immersion Fitting: 1/2″ NPT
- Application: Hot Water Immersion
Applications
- Hydronic heating systems and hot water boilers
- Domestic hot water heater temperature control
- Commercial and industrial hot water distribution
- High-limit or operating control in heating systems
- Fan or pump sequencing based on water temperature
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