How To Ohm Out A Compressor – A scroll compressor is like any other compressor in that it has a motor and compression chamber “hermetically” sealed inside the shell. There are many differences between scrolling and reciprocating compressors, but let’s focus on a few that are relevant to this discussion (or at least the ones I can think of).
The position of the motor at the bottom is the biggest thing. Copeland states in Bulletin AE4-1294 that a megohm reading as low as 0.5 megohm is acceptable for ground. In addition to the fact that this scroll makes it difficult to mag successfully (basically impossible with a device like the Sopco M500 because it only reads to 20 Mohms), it is a clear indication that scroll compressors pose a high risk of internal arcing due to tight resistance tolerances and many factors. Another thing to note is that the scroll will read ground ohms when cold when running at low temperatures due to the high coolant/oil density, and of course, you generally test the mag when the scroll is off, making it difficult.
How To Ohm Out A Compressor
All this shows that tolerance is hard on the book, to begin with. Add in a little extra discomfort, and you’re in danger.
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First, most scroll compressors won’t even let you pump them into a vacuum. Or they have a low pressure cut or some sort of low pressure / low compression bypass as shown in this USPTO photo.
For example, Copeland AE4-1303 states: “Copeland scroll compressors incorporate internal low vacuum protection and prevent pumping (unloading) when the pressure ratio exceeds about 10:1. There is an audible increase in sound when the scrolls begin to lift. This is to prevent the compressor from running into vacuum.”
In addition, there are many threats and warnings about running the scroll while it is in a vacuum, as if you had just emptied the system and then accidentally turned on the system. This is a bad idea on any compressor, but it’s even worse on a scroll.
The most obvious reason is that the compressor itself is not designed to operate in a vacuum. It will overheat and fail to fry properly, but that is not the only reason or even the main reason. All the literature mentions arcing, and I spoke to more than one tech rep who mentioned the “faucet” plug arcing or being damaged.
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First, Fusite is a brand name and one of the companies in the Emerson family. Therefore, when we say “faucet,” we are using the all-inclusive term for glass sealed through a metal compressor terminal feed. There are many different types and designs of Fusite terminals, just as there are many different types and designs of compressors. There are scroll compressors that use them; There are reciprocating compressors that they use, the ice cream truck that plays the worst music in your neighborhood probably has one – in the refrigerator compressor. Do some fuse terminals short more easily than others? I’m sure some are more sensitive than others. Is that what is happening here? Maybe, but if so, that’s only part of the story.
What we know about coils is that electrical tolerances are tight, and when electrical tolerances are tight, arcing is more likely.
It’s about to get really rude here, so if you don’t mind, stop reading and go back to the beginning, remember the four points and get on with your life.
Why is space a problem? Isn’t a vacuum devoid of matter, and it doesn’t matter that electrons arc from one surface (cathode) to another surface (anode)?
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The answer is not really that simple, but the reality is that vacuum increases the likelihood of arcing under certain conditions, and scroll compressor terminals inside the compressor are one of those conditions.
The first thing to remember is that while electrons travel through matter, electromagnetic fields do not require the presence of matter. In any case, we cannot achieve a complete vacuum. So, no matter how deep we draw the vacuum, some molecules are still there.
I’ve heard some techs attribute this to a corona discharge effect, which can be caused by particle ionization around high voltage conductors. I don’t really see any of these as the answer because the applied voltages aren’t that high, and the corona discharge isn’t sputtering or shorting in the traditional sense, just “damage” to the environment around the conductor and a nice looking light (as well as a nice Mexican beer).
My opinion (and this is opinion, not proven fact) is that the arcing is due to something called field electron emission, which can lead to an insulator breaking under vacuum conditions (NASA has to deal with it all the time in a vacuum because a vacuum is a vacuum).
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The truth is, while this phenomenon can happen on any compressor, it is more likely to happen on a scroll because of the tight tolerances and the “motor down” setting. This means that doing a high voltage mag test – or any trick / mag test – under vacuum is a bad idea.
If you want to read more about Fusite, Copeland scroll compressors, and a great general guide that includes extraction procedures, click on the links.
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Nitrogen cycling and nitrogen pressing are good practices. Nitrogen refrigeration? Not much. Nitrogen is a “non-condensable” gas because it cannot be compressed (under normal conditions). However, nitrogen is only one of the volatile materials. First, let’s talk about what a non-condensable gas is. Any gas that […] Follow along with the video below to see how to install our website as a web app on your home screen.
I have a GE GFSS6PKBASS refrigerator that has stopped freezing. I can hear the compressor start and run for a few seconds and then stop. He sits for a few minutes and repeats. I found a thread with the same problem where the PTC relay solution ended. I checked the ohms between the two pins of the relay and the resistance is 1300-1400 ohms. I also opened the relay, checked the disc and tested the resistance inside. From what I’ve read it doesn’t seem right but I can’t find an explanation for this relay. If it helps, the manufacturer part number is WR07X10112 and the marking on the rail itself is PTHTM 100MD 3m22. I’ve included some pictures so you can see what I’m working with. Any help is greatly appreciated!
You set your ohm meter setting too high at 2000, set it at 200 and post the results.
Appliance Repair School 1987-1988 Star Appliance Tech. 2 years 1988-1990 Tech Equipment Wards. 11 years 1990-2001 Sears Appliance Tech. 4 years 2001-October 2005 Equipment Repair Jack November 2005 – Present
Refrigerator Ptc Starter Relay 15 Ohm 2 Pin + Compressor Thermal Overload Protector 1/6hp 125w
With the exception of the 12 ohm reading, which reads 11.5 at the 200 setting, the other readings are too high and above the limit for that setting. There is no decimal point in the 2000 setting, they read 1376 ohms and 1294 ohms. I can’t promise my multimeter is 100% accurate because it’s cheap and doesn’t like anything, but it reads close to zero ohms when connecting the leads to the meter.
I put a new battery in the meter and rechecked all the other circuits and got relatively the same results. Overload is indicated at 0.3 ohm.
This model is almost 10 years old not 5 years old. What is the serial number? Then I can give you the exact year of this fridge.
It sounds like your gauge is reading high, so I’m betting the starter relay is good, and your compressor is bad. This is usually a sign of a bad compressor when it runs for a few seconds and shuts off.
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I meant to click ages 6-10 instead of 1-5, but honestly I guessed anyway. I got this from a colleague who moved almost 2 years ago and didn’t know the original age. The serial number is FZ900075.
I really hope I can get by with something as simple as a relay and it’s not as complicated as a compressor. For what it’s worth, and I couldn’t find a wiring diagram so I’m not sure what
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