Johnson Controls A421ABG-02 Digital Temperature Controller SPDT 120V -40/212F

The Johnson Controls A421ABG-02 is a versatile digital temperature controller designed for precise monitoring and control in HVAC, refrigeration, and heating applications. This microprocessor-based controller features a single pole double throw (SPDT) relay output for flexible switching between heating and cooling modes.

Key Features:

• Wide temperature range: -40°F to 212°F (-40°C to 100°C) for diverse applications
• 120VAC powered unit with included power cord for convenient installation
• 6-foot remote temperature sensor for flexible placement and accurate monitoring
• SPDT relay output (10A @ 250VAC) for direct control of heating or cooling equipment
• Easy-to-read LED display with simple pushbutton programming
• Adjustable differential to prevent short cycling
• User-selectable heating or cooling mode operation

This controller is ideal for commercial refrigeration, walk-in coolers and freezers, heating applications, and process control where reliable temperature management is critical. The remote sensor allows for accurate temperature measurement at the optimal location while the control unit can be mounted separately for convenient access.