HVACR (Heating, Ventilation, Air Conditioning/Refrigeration) How To Check A Commercial Refrigeration Thermostat With A Multimeter (How To Check Voltage/Resistance For Refrigeration Applications) Refrigerator Troubleshooting Guide/Penn by Johnson Temperature Controllers Refrigerator/Freezer Thermostat/Penn A19 Series Temperature Control A19ABA-40C/PENN A421 Refrigerator Thermostat/How To Check Penn Refrigeration Thermostat/How To Check Johnson Controls Temperature Control/PENN A19//Remote Bulb Temperature Control/Refrigeration Line Voltage Mechanical Thermostat Test/How To Check A Refrigerator Mechanical Thermostat With A Multimeter

Thermostats are typically found inside the refrigerator and have a knob that allows users to adjust the temperature setting. Once a user sets the desired temperature, the thermostat maintains that temperature by controlling the flow of electricity to the compressor. If the thermostat is the brain, the compressor is the heart of the operation, responsible for pumping the refrigerant through the coils.

When the air inside the refrigerator is at the desired temperature, the thermostat stops the flow of electricity to the compressor. When the thermostat senses too much heat, it allows electricity to flow, activating the compressor.

In most commercial refrigerators, the thermostat has a capillary tube filled with gas. As the temperature in the fridge increases, the gas expands and pushes on a diaphragm, which operates a set of contacts which in turn operates the compressor.

Johnson Controls A19 Series temperature controls are designed to cover a broad range of uses for heating and general purpose requirements. Controls have SPST contacts which open on temperature increase or they may be supplied in single-pole, double-throw contact action. Various control ranges are available to cover working temperatures from -30 to 550° F (-34 to 288° C). Closed tank fittings and bulb wells are available for immersion applications. These controls are designed for open low and open high applications. Where critical or high value products are to be maintained within a specific temperature differential, a single control should not be applied to function as both an open low and open high control. In these applications, a separate backup control with alarm contacts should be wired to indicate when the back-up control operates.

Subscribe to Channel:

This video by Jumper man Tech was liked: 136 times

If you like this video by Jumper man Tech, please support their CHANNEL by clicking on the SOURCE link below and Subscribe.



Featuring Your Videos:

By featuring your videos on our blog, your videos will receive hundreds of views daily from our website visitors, you get a backlink to your channel for followers to subscribe to your channel. This is a win/win for SEO for both of us. If you would like your videos or channel highlighted and premiered on our blog for FREE, please contact us.

However, if you no longer want us to premier your channel, and want us to remove your video and not feature your channel anymore, please contact us.

Video Post Disclaimer:

The information contained in the multimedia content (“Video Content”) or post content in general, represents the views and opinions of the original creators of such Video Content or post, and does not necessarily represent the views or opinions of KASRefrigeration.com. The mere appearance of Video Content or the post on the Site does not constitute an endorsement by KASRefrigeration.com or its affiliates of such Video or Post Content. 

The Video Content or Post has been made available for informational and educational purposes only. KASRefrigeration.com does not make any representation or warranties with respect to the accuracy, applicability, fitness, or completeness of the Video or Post Content. KASRefrigeration.com does not warrant the performance, effectiveness or applicability of any sites listed or linked to in any Video Content or Post.

Affiliate Disclosure:

This post and description may also contain some affiliate links, which means that the post creator may receive a small commission at no extra cost to you if you click on some of the product links and decide to make a purchase. This channel is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com

Copyright Issue:

If you find any of your copyrighted material in this post or video, please contact us, so we can resolve the issue.

All rights reserved by respective owners.

12 thoughts on “HVACR: How To Check A Commercial Refrigeration Thermostat With A Multimeter(Voltage/Resistance Test)

  1. shine says:

    ? About the 3n1. The urco 210 has a capacitor inside with a 243-292mfd rating. Can u use it on a unit that had a capacitor with a lower mfd example 161-190mfd ?

  2. Jean-Paul Arguello says:

    Thanks for the video. Very helpful. Just curious though, why when the circuit is closed does the voltage register as zero? It just seems counterintuitive. I would think that when it’s closed you’d read voltage and when it’s open you’d register as zero volts, like a single pole switch.

    It’s like its opposite with thermostats.

Leave a Reply

Your email address will not be published. Required fields are marked *