The 9 Best Johnson A421 Digital Temperature Controllers (2022 reviews)

If you want nothing less than a reliable controller, then this product is the one you should definitely consider. The Johnson A421 Digital Temperature Controller is reliable, worry free and it works well. Make sure this fits by entering your model number. Moreover, the controller comes with a temperature probe and it sets the temp.

Lastly, the johnson a421digital temperature controller is great for heat mats and it is hot.

Most customers agree that the control is for a wine room and the temperature is held constant. Moreover, a few say that the controller is a little more expensive than other control units, but it is definitely worth the money. Moreover, a few say that the controller has a temp probe and power cord included. In conclusion, many buyers have used the johnsona421 igital temperature controller for more than a few months without any issues, and it shows no sign of giving up.

Top Customer Quotes:

This controller requires a 110/120 power supply and the maximum current is 12 amps.
This is perfect for the past 4 years of uninterrupted use.
This is perfect for energizing the heat-wrap on the beer fermenter.
This comes with the power cord pre-installed and is ready to go.

Johnson Controls Temp Controller

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Compared with other products by Johnson Controls, the Johnson controls temp controller has a convenient design. The Johnson Controls Temp Controller is large, is dependable and it sets the temp. . And, the controller is reliable and suitable for heating tape.

The controller works flawlessly and it has a set range. Finally, the Johnson controls temp control made in the United States.

Almost all buyers quickly discovered that the controller is best for some applications as it has a differential setting. And, a few also found that the controller is an inline power temperature controller. Further, a few say that the second unit is a cheap upright fridge that has a temperamental temperature control unit. Overall, the tone of buyers is very positive and we believe that the controller suits the purpose.

Top Customer Quotes:

The unit is set up to run either as a cooling or heating switch.
This is easy to program and install compared to some other brands.
This is durable and worry free.
This is perfect for high quality, works well and it works well.

Johnson Controls Temperature Controller

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The johnson controls temperature control is satisfactory and appropriate and fits well with your regular use. The Johnson Controls Temperature Controller is large, works flawlessly and is worry free. Basic and advanced programming menus allow you to easily set up your control application on the lcd using a simple three-button touchpad interface. Further, it is reliable, is hot and it works well.

Most importantly, the johnson controls temperature controller suitable for heating tape and it is good for fast delivery.

Almost all buyers quickly discovered that the controller is used to repurpose a freezer into a refrigerator. Moreover, a few strongly agree that the controller has 1 female power cord to plug into your appliance and 1 male power cord to plug into an electrical outlet. And, a few also found that the controller is good for a set point that remains fairly constant as in a blower control for a heater.

Top Customer Quotes:

This comes with a temperature probe, works well and it is best for digital displays.
This worked perfectly and it is adjustable.
Easy-to-read, bright, adjustable backlit lcd screen displays the temperature.
This has set points and it works great.

Johnson Controls Temperature Controller

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The Johnson Controls Temperature Controller's superior materials makes sure that it ages well with use. The johnson controls temperature controller worked perfectly, is durable and it is adjustable. . And, the controller is great for low temp and it is great for high quality.

The controller is reliable and it is easy to install. Finally, the johnson controls temperature controller has set points, It works great and it sets the temp.

Most customers agree that the controller is manufactured by Penn, a subsidiary of Johnson controls. Further, a few also found that the controller is easy to use, even with no knowledge of electronics. Further, a few strongly agree that this unit is highly recommended as an easy fix for a wonky cooling unit, or beer fridge, etc.

Why We Like This:

This is suitable for het tape and it is best for digital displays.
Item package dimension: 5.0" l x 5.0" w x 5.0" h.
It is easy to set up cooling or heating.
This is worry free and it is dependable.

Johnson Controls Temperature Controller

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Johnson Controls has been making great controllers for years, thanks to a combination of clever design and appropriate materials. The Johnson Controls Temperature Controller worked perfectly, worry free and it is easy to install. . And, it is adjustable, is dependable and it is good for fast delivery.

Above all, the johnson controls temperaturecontroller is durable and it has a set range.

"The instructions provided are not very clear on setting up the controller, but once you get it figured out, it works great. " - says, one customer. With no doubts, this controller passed the test and had very satisfied buyers eager to share their experience.

Why We Like This:

This works flawlessly, is made for low temp and it works great.
This is best for digital display and it is great for temperature control range.
This is reliable, comes with a temperature probe and it is suitable for heating tape.
This has set points, works well and it works well.

Johnson Controls Temperature Controller

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Next on the list, we've got yet another product that manages to win our hearts. It's the Johnson controls temperature controller and it's widely considered as one of the most convenient products you can buy. The Johnson Controls Temperature Controller is suitable for surface or din rail mounting or in type 4x (nema), ip67 (ce) watertight, corrosion resistant surface mount enclosures. . Also, this is dependable and it works great.

The controller is large and it is hot. Moreover, it is reliable and it comes with a temperature probe. Above all, the johnson controls temperature control is best for low temp and it is intuitive.

"For example, this temperature controller would control, a 120v 15a max "control switch", which controls your higher power circuit devices. " - says, one customer. To sum up, many buyers have used the controller for more than a few months without any complaints, and it shows no sign of giving up.

Why We Like This:

This worked perfectly, has set points and it works well.
This is used for heat mats and it works for temperature control range.
This works flawlessly and it is perfect for high quality.

Johnson Controls Temperature Controller

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If you often find yourself confused about convenient and suitable control, this product is your end point. The Johnson Controls Temperature Controller worked perfectly and it works well. . Also, the controller is used for heating mats, is hot and it is easy to install.

Above all, the johnson controls temperaturecontroller has set points and it is durable.

"Plug the a421 into your power source, and the device you want to run into the a421. " - says, one customer. To sum up, for most customers, Johnson Controls product was what they were looking for.

Why We Like This:

This is reliable, suitable for the tape and it is best for high quality.
This comes with a temperature probe, works great and it is good for fast delivery.
Lot of satisfied buyers.

Johnson Controls Temperature Controller

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The Johnson Controls Temperature Controller should be able to handle its purpose and duties with ease. The johnson controls a temperature controller suitable for heating tape and it comes with a temperature probe. . In addition, the controller works flawlessly and it works well.

The controller is great for heating mats, works well and it is easy to install. Lastly, the johnson controls temperature control is reliable and it sets the temp.

"The menu system isn't the most obvious, but once you figure it out, it's acceptable. " - says, one customer. So, buyers were eager to recommend it to friends and would-be buyers.

Why We Like This:

This is for low temp,s works great and it is good for fast delivery.
This worked perfectly, is hot and it has a set range.
Delivers what they promise.

Johnson Controls Temperature Controller

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If you often find yourself scrambling for an appropriate and satisfactory control, this product is your end point. The Johnson Controls Temperature Controller made in the United States. . Further, it works flawlessly, suitable for het tape and it is best for digital display.

The controller worked perfectly, is good for fast delivery and it is easy to install. Lastly, the johnson controls temperature controller is made for low temp and it works great.

"The cord is pretty long but that could be helpful in many cases to install the controller in a good access location. " - says, one customer. As a result, customers were very happy to recommend it to friends and would-be buyers.

Why We Like This:

This is best for high quality and it is hot.
Ip20 standard enclosure for rail and surface-mount applications.
This has a set range and it is worry free.
Rated for 24 vac class 2.