Description
The Johnson Controls A421AED-02 is a versatile, single-stage electronic temperature controller engineered for demanding refrigeration and HVAC applications. Featuring a wide operating range and a rugged NEMA 4X-rated enclosure, this controller delivers reliable performance in commercial and industrial environments where moisture, dust, and corrosive conditions are a concern.
Key Features
- Electronic single-stage temperature control with off-cycle defrost timer functionality
- Wide temperature control range of -40°F to 212°F (-40°C to 100°C) for maximum application flexibility
- Dual-voltage compatibility: 120/240 VAC operation
- Front-panel LCD display for easy setpoint viewing and adjustment
- NEMA 4X-rated enclosure provides protection against dust, water, and corrosion — ideal for walk-in coolers, freezers, and wet environments
- Surface mount design for straightforward installation
- Includes temperature sensor with 6.6-foot lead for convenient probe placement
Off-Cycle Defrost Timer
The integrated off-cycle defrost timer allows the controller to manage defrost cycles without the need for additional controls, simplifying system design and reducing component count. This makes the A421AED-02 an ideal solution for refrigeration cases, walk-in coolers, freezers, and other applications requiring periodic defrost management.
Durable NEMA 4X Enclosure
The NEMA 4X-rated enclosure ensures the controller is protected against splashing water, dust, and corrosion, making it suitable for food service, cold storage, and other harsh commercial environments. The surface mount configuration allows for quick and secure installation on walls or panels.
Specifications
- Brand: Johnson Controls
- Model: A421AED-02
- Control Type: Electronic, Single-Stage
- Voltage: 120/240 VAC
- Temperature Control Range: -40°F to 212°F (-40°C to 100°C)
- Defrost Type: Off-Cycle
- Display: Front Panel LCD
- Enclosure Rating: NEMA 4X
- Mounting: Surface Mount
- Sensor Lead Length: 6.6 feet
Ideal Applications
- Walk-in coolers and freezers
- Refrigeration display cases
- Cold storage facilities
- Food service equipment
- Commercial HVAC temperature control
- Industrial process temperature management
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