Description
The Johnson Controls A19BAB-3 is a reliable mechanical space temperature control designed for broad compatibility across commercial and residential HVAC applications. Featuring a coiled bulb-and-capillary sensing element, this unit delivers accurate, responsive temperature sensing without the need for electronic components or external power supplies beyond the load circuit itself.
Key Features
- Mechanical temperature control — no electronics required for dependable, long-service-life operation
- Wide voltage compatibility: 24 to 277Vac, suitable for a broad range of HVAC control circuits
- SPST (Single-Pole, Single-Throw) switching action with Open High configuration — contacts open on temperature rise
- Automatic reset — returns to normal operation once temperature falls back within setpoint range
- Setpoint range of 35°F to 95°F for versatile heating and cooling control applications
- 3°F fixed differential minimizes short-cycling and provides stable control performance
- 1 3/8″ x 2 1/4″ coiled bulb and capillary for accurate, responsive space temperature sensing
- Convenient knob adjustment for easy, tool-free setpoint changes in the field
Specifications
- SKU: A19BAB-3
- Brand: Johnson Controls
- Control Type: Mechanical Temperature Control
- Switching Action: SPST, Open High
- Reset Type: Automatic
- Voltage Range: 24 to 277Vac
- Setpoint Range: 35°F to 95°F
- Differential: 3°F Fixed
- Bulb/Capillary Size: 1 3/8″ x 2 1/4″ Coiled
- Adjustment: Knob
Applications
The A19BAB-3 is ideal for controlling heating or cooling equipment in commercial buildings, light industrial spaces, and residential installations where a simple, rugged mechanical thermostat is preferred. The wide 24–277Vac voltage range makes it compatible with low-voltage control circuits as well as line-voltage equipment, providing maximum installation flexibility.
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