A421 Series Electronic Temperature Controls


A421ABC-02 A421 Standard $71.44
A421ABC-03 A421 Standard $72.18
A421ABC-04 A421 Standard $81.03
A421ABC-06 A421 Standard $81.03
A421AEC-01 A421 Standard $110.66
A421AEC-02 A421 Standard $112.88
A421GBF-02 A421 Standard $74.22
A421GEF-01 A421 Standard $106.98
A421GEF-02 A421 Standard $111.90

Product Description

These controls are single-stage, electronic temperature controls with a Single Pole, Double Throw (SPDT)output relay. The A421 models feature bright backlit LCD with adjustable brightness and a three button touchpad interface that can be set up to restrict user adjustments.  An LCD indicates the output relay’s On/Off status.  Standard A421 Series Control models have simple On and Off settings for heating or cooling, an adjustable anti-short cycle delay, temperature setback, and sensor offset capability.  The temperature control range is -40 to 212F Used to control a wide variety of single-stage refrigeration or HVAC equipment.

Click below to view the product specification sheet and additional product information.

A421 Series Standard  Specification sheet

A421 instructions

A421 catalog page

Additional Information


Johnson Controls


There are no reviews yet.

Be the first to review “A421 Series Electronic Temperature Controls”