Johnson Controls Digital Thermostat Control Unit
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- Johnson Product A419ABG-3C
- Use to control heating or cooling
- Ready to use
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A419ABG3C, Johnson Controls, Inc., ELECTRONIC TEMP CONTROL; PRE-W 0
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Most helpful customer reviews on Amazon.com
This unit has allowed me to experience Sous Vide cooking at a low cost because I use it in conjunction with an ordinary 7 quart crock pot. I gave it four stars only because the instructions are not user friendly. To help others I have posted photos of the interior mechanism on whysousvide.com. The photos clearly show where the jumpers are and how to move one of them to use it to control a heating unit rather than a refrigerator. It's quite simple once you know how. I also like the long wires as they allow plenty of room to move things around on the counter top.
I highly recommend it.
I read and researched about the Johnson unit and figured if it worked could make this MT a reliable 2nd fridge and working conversation piece. Since I already had a small investment in it another $75 was worth it to try. Ordered the unit, delivered in about a week during the Chritmas holiday and I had the unit plugged in to set up the control parameters on Dec. 31st. on New Years day I installed unit and passed the probe cable through the door molding to test the product. used a piece on thick pliable plastic tubing around cable as to protect the probe cord when the door closed... the MT door is like a vault door and can do a lot of damge to someting caught in between unlike flimsy modern fridge doors. Hung the probe taped about halfway down in the box. MT has very small freezer with no door which is essentally the evaporator, since am not using for a freezer the original temp probe contacting the outsde of the evaporator/ freezer will be overidden by the Johnson unt. Also, the MT's do not have fans and doors to move air to cool the fridge box, all done by the heavier denser cold air falling down from the evaporator/freezer. The unit retained the parameters I had set the day before.... delay 12 minutes, cut in at 39 F and cut out at 35 F. After the initial cycle the unit holds cold 2-3 hours without cycling on again for 20 - 30 minutes to cut out point. Ambient basement temp is around 65 F. Instructions were EASY to follow for with even very little technical training. This past Saturday I felt comfortable enough to drill a temperature probe sized hole through the back of the MT unit to install the probe the correct way. Got the probe through the outside steel wall, the insulation and the inside steel (not plastic) wall after two attempts through the barely large enough drilled holes. Siliconed the openings up outside and inside. So far all is good. Not afraid to keep food, beer, pop etc now in this unit.
I know this post is long winded but anyone with an old refigerator from the 20's or 30's etc that needs temp control knows how tough it is too find helpful info. Hope to make that 80 year old compressor last another 80 years since not straining to maintain 10F in the evaporator/freezer.
I initially had it simply sitting in the freezer, but I soon realized that the beer was warmer that I needed it to be. I figured out that measuring the air temperature was not the way to go.
I wrapped the temperature probe in plastic and submerged it in a bottle of water so that it actually uses the temperature of the liquid instead of the internal air temperature. This allows me to regulate the temperature of the freezer by how cold the liquid is, not how cold the air is.
The way that it controls the temperature is by allowing the unit to switch on when it rises above the desired temperature and completely cutting off the electricity when it reaches or falls below the set temperature. Keep this in mind as any lights associated with fridges or freezers will only work when the unit allows power to go to your device.
A power surge during a storm killed it, lesson learned--plug it into a surge protector. If the customer service had been nicer or more helpful I would have given it more stars but I have never been treated that awful by someone in the goods business. My husband even tried the next day and were equally as awful and unhelpful.
Customer service=1 star