A421ABD-02 MFG #: A421ABD-02
Out of Stock
  • Availability: Available for Delivery
  • Category: Temperature Control
  • Warehouse Availability: WESE
  • Refresh Carrier Images: Done
  • Sx.e Stocking Unit: Each
  • Sx.e Vendor: NEUCO INC
Johnson Controls (Penn Controls) -40 to 212 Deg F, 120/24 VAC, SPDT, Thermoplastic Enclosure, Type 1, Electronic Temperature Control

A421 Series electronic temperature controls are single-stage controls with a single-pole, double-throw (SPDT) output relay. Use with single-stage refrigeration or HVAC equipment. A421 controls feature a backlit LCD with adjustable brightness and a three-button touchpad interface that can be set to restrict adjustments. Standard modules have simple on/off settings for heating or cooling, an adjustable anti-short cycle delay, temperature setback, and sensor offset capability. Models are also available with integral power cord, off-cycle defrost, or integral cycle timer.

Features & Benefits

  • Easy-to-read, bright, adjustable backlit LCD screen displays the temperature, parameters, and status clearly and allows you to adjust LCD brightness for the ambient light conditions
  • Custom icons on the display provide visual cues on system and control status
  • Basic and advanced programming menus allow you to easily set up your control application on the LCD using a simple three-button touchpad interface
  • Adjustable On and Off temperature set points enable easy to set up cooling or heating control applications on the three-button touchpad, eliminating the need to remove the cover and reposition jumpers for reverse or direct control action
  • High and low temperature set point adjustment stops allow you to set up your application for your desired range of adjustment and restrict user adjustment to just the desired temperature adjustment range
  • Displayed temperature offset allows you to adjust the displayed temperature to the actual sensed temperature in applications where the resistance error in long sensor cable leads cause a deviation in the displayed temperature from the actual sensed temperature


  • Type: Type 1
  • Temperature Range: -40 to 212 Deg F
  • Maximum Temperature Rating: 212 Deg F
  • Contact Rating: 120/24 Volt AC
  • Contact Configuration: SPDT
  • Enclosure Material: High Impact Thermoplastic
  • Enclosure: NEMA 1
  • Application: DIN Rail, Surface Mount
  • Approval: CE
  • Includes Integral Timer, A99Bb-200C Temperature Sensor