Compressor Overload Protector Testing! How it Works!

In this HVACR Training Video, I Test the two types of commonly used External Compressor Overload Protectors. I show how hot they get before they trip, how they are wired and how to troubleshoot them using a multi-meter. Supervision is needed by a licensed HVACR Tech while performing tasks as Experience and Apprenticeship garners Wisdom and Safety.

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Learn how to properly service, maintain, and install a wide variety of Danfoss products for air conditioning and commercial refrigeration. This training program walks you through how to select and install the right components, ensure reliable performance, and reduce service time.

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[jeffarp]

Very in depth, this is good for someone like myself who is very amateur and who is trying to learn a little about this trade on my own.

[AGL.]

2:04 At this place in the video is where I believe the issue is on my Magic Chef mini frig as that little electric coil is crispy fried inside the Compressor Overload Protector ( which looks basically the same as that one with the little coil in the video ). I didn't get a reading on my multimeter Ohms setting so decided to just open up the "fuse" / overload Protector and found the coil fried and just like a fuse, part of it was burnt clean through thus no circuit continuity. Being totally unfamiliar with any of this hardware as it's not my career I had no idea just looking at that COP that it would have had anything at all in it. Your video was very useful and really good. Thanks ! Too bad I can't add a photo of the fried coil but it burnt clean through near one of its solder post points.

[vanontom]

Thank you! Videos like yours are invaluable but fairly rare. The signal-to-noise ratio on the net these days is not ideal.

It's amazing what we learn when things fail: For me lately, it's all about fridge (relay, overload, capacitor, compressor), combining info from videos like yours, while taking things apart to look inside and figure out how they work. I've bought a couple cheap aftermarket "start devices" (combo relay, overload); one failed immediately, the other failed after about a week. It seems the overloads do not have continuity when cool, going to take one apart now to have a look. (Update: Overload had continuity only up until final link to terminal, underneath disc there was tiny wire that was disconnected or blown on one side; not coiled at all like in video, possibly due to being cheap junk.) I cleaned up the original old start device (corrosion, connections, relay disc) and the fridge is no longer complaining (luckily the overload and capacitor seem fine). Will get me by until I can find some affordable OE genuine parts.

[cuocsongomy]

This video makes my life is better . Thank you 🙏

[michaelgasperik]

Thank you for helping me with my refrigerator.

[stuzman]

Good information Craig of how thermal overloads work along with the demonstration. Keep up the good work! 😀👍

[gregeezy]

Thanks for the great video. Time to take my dehumidifier apart and see if I can fix it. I'm fairly certain this is the issue...

[wannis]

Great educational videos, you are awesome. thank you for your contribution to better everyone in HVAC business.

[batvanio]

And how do you know what thermal protection for refrigerator compressor you need? The degree of protection is not written on mine. As far as I saw there are degrees from 1/2HP to 1/16HP. All I know is that he spends 107Kwatt a year. Or so it is noted. This is written on it: DRB12T61A1 AM 18I-2 *129. It's the fridge NEO BC-125 WA+ MID

[Andyn]

Great video, thank you for taking the time to make it

[lJUSTwanaCOMMENT]

That just answered a couple questions I could not find answers to anywhere else.

[jimbola]

thank you, partner, for sharing what an excellent video thank you for sharing.

[wasimedoo]

Very good information bro keep it up God bless

[robert]

I had an issue with the heat pump last fall. The first thing I noticed was the unit wasn't cooling well, but when I checked the pressures everything was ok and the fan seemed to be running fine. I thought it must be because it was too hot out. Then I got the electric bill which was really high. I checked both the caps and they were low, replaced both and the load current dropped. The condenser fan (outside) was pretty old and I decided to replace it (had a spare already) and didn't want to loose the compressor. All is ok now, but wouldn't it be nice to have something that could warn you with something like a wide flat lever that would smack you up the side of your head. Well, maybe some simple circuits with temp switches, I guess one on each fan motor and then something on the compressor. You could latch and lockout a 24V relay, turn on a light and a buzzer as an early warning or just break the 24V to the unit and also leave some clues to what the failure was. Those thermal overloads that just reset and start the cycle again will eventually kill the compressor (a couple of days past the warranty).

[jameswasher]

Another fine video. Good job explaining these devices. What I'm left wondering is why they auto-reset. Is this just there for some sort of short-cycle situation (resulting in high head pressure), like a short power outage? Or perhaps for brown-outs, where the voltage goes down but the current goes up. Otherwise, if they compressor can't start now, why would we expect it to start in 4 minutes when this protective device cools down.

[josefprem]

Best video I could find. I have tested the compressor and the thermal protector and cap, all look good. When I test the two wires that go to the protector/cap and plug in the power cord I only get 0.3 Volts. Should it be 120V? what would cause this?

[SamhoustonStricklin]

I have the second device in the video. If it reads OL is it also damaged like the first device shown ?

[gemini]

my 0.6 hp window type ac suddenly stops cooling anymore. I heard a soft humming sound and a few seconds later the sound is gone and no sounds of the compressor. Does it mean the protector is busted? Pls reply sir. Thanks.

[mohmad]

I could not find a website or video explaining the specifications of the Refrigerator Overload Protector, because some of them contain incomprehensible numbers.