Description
The Johnson Controls A421AED-01 is a versatile, heavy-duty electronic temperature controller engineered for demanding refrigeration and HVAC applications. Built to handle a wide operating range and harsh environments, this surface-mount controller delivers reliable, precise temperature management with a user-friendly front panel interface.
Key Features
- Electronic temperature control with off-cycle defrost timer for automated defrost management
- Wide temperature control range of -40°F to 212°F (-40°C to 100°C) for refrigeration and heating applications
- Dual-voltage compatibility: 120/240 VAC for flexible installation across various electrical systems
- Front panel LCD display for easy setpoint viewing and programming
- NEMA 4X enclosure rating — resistant to corrosion, dust, and water ingress, suitable for wet or washdown environments
- Surface mount design for straightforward panel or wall installation
- Includes temperature sensor with 9-7/8″ lead for immediate out-of-box deployment
Product Specifications
- SKU: A421AED-01
- Brand: Johnson Controls
- 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: 9-7/8″
- Sensor: Included
Applications
- Walk-in coolers and freezers
- Refrigerated display cases
- Cold storage facilities
- Commercial refrigeration systems requiring automated defrost control
- HVAC systems requiring precise electronic temperature management
The A421AED-01’s NEMA 4X-rated enclosure makes it an ideal choice for food service, commercial refrigeration, and industrial environments where moisture and contaminants are a concern. The included temperature sensor and surface-mount design simplify installation, while the intuitive LCD front panel allows technicians to program and monitor setpoints with ease. Trust Johnson Controls’ proven engineering to keep your temperature-critical systems running efficiently and reliably.
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