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Johnson A421 Digital Temperature Controller

$104.99
& Free Shipping Details
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Product details

The Digital Temp Controller operates by overriding the internal thermostat in a refrigerator or freezer and gives the brewer greater control over the fermentation. Precise control of fermentation temperature is one of the most beneficial things you can do to improve your home brew beer.

It is also ideal for controlling the serving temperature of your kegerator or keezer.

The digital controller has a digital display with adjustable differential. It can be used to heat or cool a fermentation environment. When hooked up to a refrigerator, it turns the compressor on when the ambient temperature rises above your programmed temperature; when hooked up to a heater, it activates when the temperature drops too low. A sensor probe monitors the temperature inside while the readout displays it in either Fahrenheit or Celsius. This is the ideal choice for lager brewers who include a diacetyl rest in their fermentations or for ales like altbier or Kolsch that require fermentation temperatures in the low end of the ale range.

External overriding thermostat with backlit digital display. High and Low Temperature Stop Values determine whether the unit is heating or cooling. There is no longer a need to open the unit to switch between heating and cooling modes.

Features:

  • Plug play - this controller is pre-wired, so you don need a degree in electrical engineering to get it up and running.
  • New! Backlit display for even easier-to-read display - this one speaks for itself, but when we say easy, we mean easy. 
  • New! Faster Programming with three-button interface
  • New! High and Low Temperature Stop Values determine whether the unit is heating or cooling.
  • New! Internal defrost settings
  • Fully detailed manual, excellent service and support
  • Features a wide setpoint temperature range (-40° F to 212° F). The temperature sensor is a 1.94 inch thermistor on an 8 foot cable.

Additional information

Support Documents Click here for documents
Support Documents - Instructions Click here for instructions
SKU

41944

Customer Reviews

Based on 20 reviews
80%
(16)
15%
(3)
5%
(1)
0%
(0)
0%
(0)
D
D.
Everything worked great and the service was great also

Worked great

R
R.L.S.J.
Finally, my kegorator is no longer freezing beer

Finally, my kegorator is no longer freezing beer! I set this unit for a four degree swing. Works great!!!!!!

D
D.
Works Great!

Works great so far, I have only been using it for a few weeks, but I love it.

B
B.R.
Works great

This Johnson Temperature Controller was purchased to replace a 10 year old analog model that wasn't keeping the temperature in my beer cooler steady. After sifting through the rather detailed engineering instructions for its other uses and connections, I found it fairly easy to set it to keep the beer temperature where I want it at around 38 degrees. It has attachment connections on the back of the unit and I mounted it easily on a stud behind the cooler and it's easy to read with the green backlight behind the digital numbers. Would recommend it.

B
B.T.
solid controller, very accurate - pain to use

the user interface on this unit is not very easy. It's not too painful, but, could be so much easier.

functionally, this is a very solid unit, keeps my temps rock solid

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Johnson A421 Digital Temperature Controller

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