Johnson Controls A421ABC-02 Temperature Control

A421ABC-02 is the direct cross version of A320ABC-1, A419ABC-1, A421ABC-02C, A319ABC-12-02, A319ABC-24-02

Johnson Controls A421ABC-02 Electronic Temperature Control | 120/240V, -40°F to 212°F Range, LCD Display, NEMA 1 Enclosure

The Johnson Controls A421ABC-02 is a high-performance electronic temperature control solution designed for accurate and reliable heating and cooling applications. Engineered for flexibility and ease of use, this single-stage SPDT control operates on 120/240 VAC and includes a temperature sensor with a 6.5 ft (2.0 m) cable and a 2" probe for precise monitoring.

Housed in a durable NEMA 1/IP20 enclosure, the A421ABC-02 is suitable for DIN rail or surface mounting, making it ideal for a wide range of commercial and industrial temperature control applications. Its bright, adjustable backlit LCD display and intuitive three-button interface simplify programming and status monitoring.

Key Features:

• Wide temperature control range: -40°F to 212°F (-40°C to 100°C)

• Includes A99BB-200C sensor with 6.5 ft cable for accurate temperature sensing

• Adjustable On/Off setpoints for heating or cooling applications

• Anti-short cycle delay to protect equipment and reduce wear

• Customizable temperature offset and setback for energy savings

• SPDT output relay provides reliable single-stage control

• User lockout feature prevents unauthorized parameter changes

• Mounting options: Surface or DIN rail

• Rated for 120/240 VAC operation

• NEMA 1 / IP20 enclosure ideal for indoor use

Common Applications:

• HVAC system temperature control

• Chiller and boiler management

• Cooling tower fan control

• Air handler damper and valve actuation

• Alarm systems and temperature monitoring

• Supply and return air temperature regulation

Whether you're replacing an old thermostat or installing a new system, the Johnson Controls A421ABC-02 offers the precision, durability, and ease of installation needed for dependable temperature control.

Manufacturer: Johnson Controls
Model: A421ABC-02
UPC: [Include if known]
Mounting Type: DIN Rail or Surface
Voltage: 120/240 VAC
Temperature Range: -40°F to 212°F
Enclosure Rating: NEMA 1 / IP20