Description
Johnson Controls A421ABC-03 Electronic Temperature Control Overview
The Johnson Controls A421ABC-03 is a versatile, single-stage electronic temperature controller engineered for demanding HVAC, refrigeration, and industrial process applications. Designed to operate on 120/240 VAC power, this controller delivers reliable, precise temperature management across an exceptionally wide range of –40°F to 212°F (–40°C to 100°C), making it suitable for both sub-freezing and high-temperature environments.
Front Panel LCD Display
The integrated front-panel LCD provides clear, at-a-glance readings of setpoint and sensed temperature, simplifying commissioning and routine monitoring without the need for additional test instruments. Intuitive controls allow technicians to adjust setpoints quickly and confidently in the field.
Flexible Mounting Options
The A421ABC-03 is housed in a NEMA 1 enclosure rated for indoor use and supports both DIN rail and surface-mount installation, giving installers the flexibility to integrate the controller into existing electrical panels or mount it directly to a wall or equipment surface.
Included Temperature Sensor
This controller ships complete with a temperature sensor featuring a 9.75-foot cable and a 2-inch immersion probe, enabling immediate installation without sourcing additional accessories. The generous cable length provides routing flexibility in a wide variety of equipment configurations.
Key Features & Specifications
- SKU: A421ABC-03
- Control Type: Single-stage electronic temperature control
- Supply Voltage: 120/240 VAC
- Temperature Control Range: –40°F to 212°F (–40°C to 100°C)
- Display: Front-panel LCD for setpoint and sensed temperature
- Enclosure Rating: NEMA 1 (indoor use)
- Mounting: DIN rail or surface mount
- Includes: Temperature sensor with 9.75-foot cable and 2-inch probe
- Brand: Johnson Controls
Ideal Applications
- Refrigeration equipment control
- HVAC unit protection and staging
- Cooling tower and chiller management
- Industrial process temperature control
- Freezer and cooler temperature regulation
Why Choose the Johnson Controls A421ABC-03?
Johnson Controls is a globally recognized leader in building controls and HVAC solutions. The A421ABC-03 combines wide-range temperature sensing, dual-voltage compatibility, and a user-friendly LCD interface in a rugged NEMA 1 enclosure — all in a single, ready-to-install package. Whether you’re managing a commercial refrigeration system or protecting HVAC equipment from extreme temperatures, this controller delivers the reliability and precision professionals demand.
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