Description
Johnson Controls A421 Electronic Temperature Controller | Type 4X
The A421 Series Electronic Temperature Controls are single-stage, electronic temperature controls with a single-pole, double-throw (SPDT) output relay.
A421 Controls feature a backlit LCD with adjustable brightness and three-button touchpad interface that you can set up to restrict user adjustments. An LED indicates the output relay's on and off status.
A421 Controls have simple on and off temperature settings for heating or cooling, an adjustable anti-short cycle delay, temperature setback, and sensor offset capability.
The temperature control range is -40°F to 212°F or -40°C to 100°C.
