Description
The Johnson Controls A19ABC-12 is a mechanical hot water immersion temperature control engineered for reliable, precise temperature management in hydronic heating and hot water systems. Featuring a wide 100 to 240°F setpoint range and an adjustable differential of 6 to 24°F, this control delivers the flexibility required for a broad range of commercial and industrial HVAC applications.
Key Features
- Wide voltage compatibility: 24 to 277Vac for versatile system integration
- SPDT switching action: Opens High on R-B circuit and Opens Low on R-Y circuit for dual-function control capability
- Automatic reset for hands-free recovery after temperature excursions
- 100 to 240°F adjustable setpoint range to suit a variety of hot water and hydronic applications
- 6 to 24°F adjustable differential for precise dead-band control
- 1/2″ NPT immersion fitting for straightforward installation into standard pipe tappings
- Mechanical operation — no external power required for sensing element
Switching Configuration
- SPDT (Single Pole Double Throw) output
- Open High: R-B contacts open on temperature rise
- Open Low: R-Y contacts open on temperature fall
- Automatic reset — no manual intervention required after setpoint recovery
Electrical Specifications
- Voltage range: 24 to 277Vac
- Switch type: SPDT
Temperature & Differential Specifications
- Setpoint range: 100 to 240°F
- Adjustable differential: 6 to 24°F
Mechanical Specifications
- Immersion type: Hot water
- Connection: 1/2″ NPT
- Reset type: Automatic
Typical Applications
- Hot water boiler systems
- Hydronic heating loops
- Commercial water heating control
- Industrial process temperature switching
- HVAC heating system protection and regulation
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