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Johnson A421 Digital Temperature Controller
FE609
In Stock
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Description

The Johnson digital temperature controller is used to control the temperature of a refrigerator, or similar cooling or heating device. Enter your desired temperature, called set point, and how tightly you want your temperature maintained, called differential, and let the controller do the rest.

This is a high quality, ready to go temperature controller that is accurate and easy to use.

Item # FE609
Shipping Eligible for Free Shipping Program
Availability California - In Stock
Pennsylvania - In Stock
Weight 2LBS
Community Q&A

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Browse 2 questions Browse 2 questions and 6 answers
Why did you choose this?
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need to control my fermenting temp, and was recommended by a friend.
Mark H on Feb 14, 2018
need to control my fermenting temp, and was recommended by a friend.
Mark H on Feb 14, 2018
To make a chest freezer into a fridge for a mobile cafe. This conversion is more space saving than a regular fridge.
Brenda de S on Jan 12, 2018
To make a chest freezer into a fridge for a mobile cafe. This conversion is more space saving than a regular fridge.
Brenda de S on Jan 12, 2018
I read you no longer have to remove a jumper to change from heating to cooling. It can be done from digital interface. Is this true?
Kenneth Kahle on Jan 20, 2018
BEST ANSWER: Yes it’s true. But remember you can only monitor one or the other. In my case I have two units. One that’s controls heat and a separate unit that controls cold temperatures. I also thought that the instructions were a bit more technical and hard to follow unless you set up refrigeration systems for a living. It took me a couple of days to figure them out. My best tip and the one I missed at first (being a guy) is there is a picture of a flame or ice to help you know whether you are controlling hot or cold temperatures.
Reviews

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Works great.
Works great for fermentation temp control, keeps the temp within a degree or less of the setpoint using a thermowell on the fermenter and an older Kenmore fridge. Super easy to use and install.
January 20, 2018
Purchased
1 month ago