Electronic Temperature Control Single Stage With Bright Backlit LCD Display Easy Setup And Adjustable On Off Temperature Points Simple Three Button Interface For Fast HVAC Thermostat Control And Reliable Temperature Regulation
The A421 Series Electronic Temperature Controls are single-stage controls with a SPDT output relay, a bright backlit LCD, and a three-button touchpad interface that can be set up to restrict user adjustments. An LED indicates the output relay’s On/Off status. The controls offer adjustable On and Off temperature settings for heating or cooling, plus anti-short cycle delay and a temperature offset function. Remote sensing capability and interchangeable sensors add flexibility for HVAC and process environments. Enclosures include Type 1 (NEMA)/IP20, surface or DIN rail mounting and Type 4X (NEMA)/IP66 for washdown environments. Some models also feature Off-Cycle Defrost control with configurable duration and frequency. Release Date: 05-12-2017; Color: gray
✅ SPDT output relay (1-pole, 2-throw) for heating/cooling control✅ Bright backlit LCD display for easy visibility in any lighting
✅ Three-button touchpad interface for quick setup and adjustments
✅ Adjustable On/Off temperature set points for precise control
✅ Adjustable anti-short cycle delay to protect equipment
✅ Temperature offset function for calibration between sensors
✅ Remote sensing capability with interchangeable sensors for flexible installations
✅ Enclosures: Type 1 (surface/DIN rail) and Type 4X (IP66) options
✅ Off-Cycle Defrost option on select models (A421ABD/A421AED)
✅ Wide control range: -40 to 212°F (-40 to 100°C) standard; -40 to 248°F (-40 to 120°C) for qty orders
💡 What is a single-stage electronic temperature controller used for in HVAC systems? It provides simple, reliable on/off control with adjustable setpoints. - SPDT relay output for heating and cooling control in HVAC systems - Backlit LCD display for visibility in all lighting conditions - Remote sensing capability and interchangeable sensors for flexible installations
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