Product Overview
Johnson Controls Electronic Temperature Control (A421ABD-02)
The Johnson Controls A421ABD-02 Electronic Temperature Control is a line-voltage temperature controller used to regulate HVAC and refrigeration equipment through an SPDT relay output and an included A99BB-200C temperature sensor. The control supports temperature management and adjustable off-cycle defrost operation in medium-temperature cooling applications, including display cases, reach-in units, and walk-in coolers. This Type 1, IP20 model is rated for 120/240 VAC operation and is designed for DIN rail or surface-mounted installations.
Part Details:
- Johnson Controls A421ABD-02 electronic temperature control with off-cycle defrost functionality
- Single-stage control with SPDT relay output
- Rated for 120/240 VAC, 50/60 Hz supply power
- Type 1 (NEMA) IP20 enclosure suitable for DIN rail or surface mounting
- Includes A99BB-200C temperature sensor with 6.6 ft. (2.0 m) cable
- Adjustable temperature control range from -40°F to 212°F (-40°C to 100°C)
Documentation:
- Johnson Controls electronic temperature control installation manual
- Johnson Controls electronic temperature control tech sheet
- Johnson Controls electronic temperature catalog page
