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The A421 Series control is a single stage, electronic temperature control thermostat with a single-pole, double-throw (SPDT) output relay and a NEMA 4X housing.
SKU: 59600D
$142.66
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The A421 Series control is a single stage, electronic temperature control thermostat with a single-pole, double-throw (SPDT) output relay and a NEMA 4X IP66 housing.

Features:

  • Single Stage
  • SPDT output relay
  • Easy-to-Read LCD temperature display
  • Lockable front-panel display for set up and adjustment
  • 120/240V
  • Can display both Farenheit and Celsius measurments
  • Includes an A99BB-25C temperature sensor with 9-7/8 inch (0.25 m) cable. Ambient operating temperature range: -40 to 212ºF (-40 to 100ºC)
  • Longer sensor cable options are available in related
    products below

Applications:

The A421 Electronic Temperature Control can be used to control a wide variety of single-stage refrigeration or HVAC equipment. Sample temperature control applications include:

  • temperature monitoring and alarming
  • on/off control of boilers and chillers
  • boiler and chiller pump control
  • heating or cooling control
  • cooling tower fan control based on water temperature
  • supply, makeup, and mixed air temperature control
  • temperature actuated valve control
  • supply and makeup air damper and fan control
  • condenser fan control based on condenser temperature

A421 Series Thermostat Installation & Operation Manual

The A421 Series control is a single stage, electronic temperature control thermostat with a single-pole, double-throw (SPDT) output relay and a NEMA 4X IP66 housing.

Features:

  • Single Stage
  • SPDT output relay
  • Easy-to-Read LCD temperature display
  • Lockable front-panel display for set up and adjustment
  • 120/240V
  • Can display both Farenheit and Celsius measurments
  • Includes an A99BB-25C temperature sensor with 9-7/8 inch (0.25 m) cable. Ambient operating temperature range: -40 to 212ºF (-40 to 100ºC)
  • Longer sensor cable options are available in related
    products below

Applications:

The A421 Electronic Temperature Control can be used to control a wide variety of single-stage refrigeration or HVAC equipment. Sample temperature control applications include:

  • temperature monitoring and alarming
  • on/off control of boilers and chillers
  • boiler and chiller pump control
  • heating or cooling control
  • cooling tower fan control based on water temperature
  • supply, makeup, and mixed air temperature control
  • temperature actuated valve control
  • supply and makeup air damper and fan control
  • condenser fan control based on condenser temperature

A421 Series Thermostat Installation & Operation Manual

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