Description
The Johnson Controls A19QSC-4 is a mechanical remote bulb temperature control engineered for reliable, precise temperature sensing across a broad range of HVAC and building automation applications. With a wide voltage compatibility of 24 to 277Vac and a robust SPDT switching configuration, this control integrates seamlessly into diverse system designs—from commercial air handlers to refrigeration and process equipment.
Key Features
- Wide setpoint range of 0°F to 190°F for versatile application coverage
- Fixed 5°F differential for consistent, predictable switching performance
- SPDT (Single-Pole, Double-Throw) switching action accommodates both normally open and normally closed circuit configurations
- Broad voltage compatibility: 24 to 277Vac for use across low- and line-voltage systems
- Automatic reset operation — returns to normal state once temperature recovers, minimizing manual intervention
- 20-foot capillary allows remote placement of the sensing bulb away from the control body
- 3/10″ x 2-1/2″ sensing bulb for accurate, responsive temperature detection
- Concealed screw design for a clean, tamper-resistant installation
- Mechanical (non-electronic) operation for dependable, long-service performance
Specifications
- Model: A19QSC-4
- Brand: Johnson Controls
- Control Type: Mechanical Remote Bulb Temperature Control
- Switching Action: SPDT
- Reset Type: Automatic
- Voltage Range: 24 to 277Vac
- Setpoint Range: 0°F to 190°F
- Fixed Differential: 5°F
- Capillary Length: 20 feet
- Sensing Bulb Size: 3/10″ x 2-1/2″
- Adjustment Style: Concealed Screw
Applications
- Commercial and industrial HVAC systems
- Air handling units and duct temperature control
- Refrigeration equipment temperature monitoring
- Hydronic heating and cooling systems
- Process temperature control in building automation
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