Description
The Johnson Controls A19BBC-2 is a mechanical coiled bulb space temperature control engineered for reliable, precise temperature sensing in commercial and industrial HVAC applications. Featuring a single-pole, double-throw (SPDT) switching action with automatic reset, this controller offers wide voltage compatibility and a broad sensing range to suit a variety of heating and cooling control scenarios.
Key Features
- Mechanical temperature control with automatic reset — no manual intervention required after trip
- SPDT switching action for flexible heating or cooling control wiring configurations
- Wide voltage compatibility: 24 to 277Vac for use across low- and line-voltage systems
- Broad setpoint range of -30°F to 100°F covers sub-freezing to moderate ambient conditions
- Adjustable differential of 3°F to 12°F allows fine-tuning of switching deadband
- 1 3/8″ x 2 1/4″ coiled bulb and capillary sensing element for accurate space temperature measurement
- Designed for wall-mount space temperature sensing in occupied areas
Specifications
- Brand: Johnson Controls
- Model / SKU: A19BBC-2
- Control Type: Mechanical, Temperature
- Switch Action: SPDT (Single-Pole, Double-Throw)
- Reset Type: Automatic Reset
- Voltage Range: 24 to 277Vac
- Setpoint Range: -30°F to 100°F
- Adjustable Differential: 3°F to 12°F
- Sensing Element: 1 3/8″ x 2 1/4″ Coiled Bulb and Capillary
- Application: Space Temperature Control
Application & Benefits
The A19BBC-2 is ideal for HVAC contractors and building engineers who need a dependable, field-adjustable mechanical thermostat for space temperature control. The coiled bulb and capillary sensing element provides stable, responsive temperature measurement in occupied spaces such as offices, mechanical rooms, and commercial facilities. The wide 24–277Vac voltage range makes it compatible with both low-voltage control circuits and line-voltage applications, reducing the need for multiple product SKUs across a job. The adjustable 3–12°F differential gives technicians the flexibility to minimize equipment short-cycling or allow broader swing depending on system requirements. Automatic reset ensures the control returns to normal operation without manual reset after the temperature condition clears.
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