The resistance drops from 12 to 10 ohms as it first heats up and then the resistance rises quickly (this appears to be correct based on PTC temp/resistance charts). Lockers and cabinets obstructed the airflow which lessen it's efficiency. When people hear the refrigerator working, what they are hearing is the motor powering the compressor. The compressor is normally near the rear floor of the refrigerator. The outside coil is dirty or folded over so that the system has trouble rejecting heat, this causes the compressor to have to work harder and hence get warmer. I've measured voltage from common to both run and start windings during "startup". The site may not work properly if you don't, If you do not update your browser, we suggest you visit, Press J to jump to the feed. As it does its job, it generates a great deal of heat. Build a homemade air compressor out of a fridge compressor. I monitored running current but it's fine. The start coil gets 230V (Europe) briefly, then drops out, and the run coil gets 230V constantly once the first start attempt is made. The coils are not open or shorted to each other or shorted to ground. The compressor is moving. New comments cannot be posted and votes cannot be cast, More posts from the refrigeration community, Questions, discussions, and stories related to the Commerical and Industrial Refrigeration industry, Looks like you're using new Reddit on an old browser. Also the overload relay itself could fail. Hi there! The outside coil is dirty or folded over so that the system has trouble rejecting heat, this causes the compressor to have to work harder and hence get warmer. The compressor is normally near the rear floor of the refrigerator. Jack Burton started writing professionally in 1980 with articles in "Word from Jerusalem," "ICEJ Daily News" and Tagalong Garden News. This 15 amps is of course not normal here, and tripping the overload. September 2013 Hunker may earn compensation through affiliate links in this story. The lid is usually held on with a clip that is popped off with a screwdriver. If your compressor feels like it is constantly trying to start and can not start it is time to call a technician to diagnose what is causing this. When a compressor is tripping and very hot the term used is: thermal overload. As it does its job, it generates a great deal of heat. The refrigerator overload protector testing is very easy using a multi meter, to test your refrigerator thermal overload protector follows the below steps. Thanks and jerp safe everyone. First of all off the refrigerator and plug out the refrigerator supply plug from the outlet, or switch off the double pole circuit breaker from which the refrigerator supply plug controlled. Of course I'm hoping it isn't the compressor, but at some point everything else will be ruled out. It's about the only explanation I can think of for having an almost equal start and run, but a lower resistance for start + run. You appear to have ruled that out though. May 2012. I replace the original oil with ATF, i read it in an article alternatves fr air cmpssr oil. Is it because of the oil not comptible? First uts all good but becouse of the Atf's detergent the oil becmes foamy. Push the spring clip that holds the piece in to the side with a screwdriver and insert the new overload protector. My AC starts and works for half an hour then the compressor stop while the fan keeps working. or the old atf oil residue etc is mix wth the new oil inside the hernetic comp? It's not just a hum, its definitely moving, so it isn't mechanically locked. Thanks for this very helpful post about compressor!). When a  compressor is tripping and very hot the term used is: thermal overload. There are many parts inside the box that must work together smoothly in order to keep the inside air at the desired temperature. When it works the air is cold no strange noises and everything works perfect. I've pulled the PTC and measured the resistance over a range of temperatures. This within about 5 seconds of starting up. If I leave it off for some time it works again for half hour. It comes on runs, shuts off and then tries to restart in under 5 minutes. Buy a Supco "3n1 Starter" and install that on the compressor. There are two usual suspects. May 2014 February 2013 Since then, I've unplugged it, and it's at room temp. August 2012 The sensing device, of a bimetal strip made of two metals bonded together, expands in overload conditions to eventually trip a mechanical device. Oh it will run but will end up just like what happened, runs a little higher amps and over time it sits and gradually cooks that varnish away then hmmmm click! The coils are not open or shorted to each other or shorted to ground. Education makes people to determine the possible earnings so that they can continue. A couple nights ago, I noticed that my fridge was clicking loudly whenever the compressor would kick on (and then back off). So i change it with a non detergent air compressor oil. Not within 5%, but not far outside either and could be at least partly based on the measurement. This is easy to access but should only be done with the unit unplugged from the wall. In my frustration, I decided to bypass the overload for a few seconds to see what would happen (I know I know, but I have not much left to lose). Could it be a bad thermal resistance or is my compressor leaving me? Burton holds a B.S. So, now it’s time to replenish that body and treat it nicely. Without those resistances, my other first guess would have been a faulty start cap or start relay and it's getting stuck on run. I just want to say that when a compressor fails, the system also starts to collapse. A refrigerator is one of the hardest working appliances in the home. Don't run the new one on an extension cord either! Bleed a tiny bit of gas out and have a sniff, does it have a kindof burn smell to it? To learn about our use of cookies and how you can manage your cookie settings, please see our Cookie Policy. 2. He is a 26-year veteran of the U.S. Navy/Navy Reserves and the Navy Seabees. Jones Air Conditioning: (239) 596-5855 Naples, Bonita Springs, Marco Island 24 Hour Air Conditioning Service, Repair & Replacements. June 2013 Your start and run windings should not be equal, and the total of start -> common + run -> common should be equal to start -> run as the windings would be getting measured in series. You are now sweaty, beat, but probably feel pretty darn good for how hard you just worked. The compressor seems to run, but shakes a bit, then a bit more, and may have locked up/kicked off just before I unplugged it. Any advice about this will surely help me to fix this problem. The weird thing is, the compressor seems to run for the 1-2 seconds before the overload trips, so not sure why the run winding would be drawing 15A. Capacitor across the PTC marked 5uF ±5% measures 4.62uF. This article is very usefull specially for a diter like me. Wow this is an useful tip. This causes the compressor to have to start while the refrigerant tubes have not had their pressure equalized. The overload protector has a wire running from it directly to the compressor, which makes it easy to identify. I know that it's the compressors thermal that is tripping but why ? Pull the wires that clip onto the piece away from the protector. He has managed radio stations, TV studios and newspapers, and was the chief fundraiser for Taltree Arboretum. October 2012 By creating an account you agree to the Hunker, Reliable Appliance Repair Crew: Identification of Failed Refrigerator Components, Acme How To: How To Replace the Overload Protector. Reason perhaps it's used almost 10 years and previous camp management has no preventive a/c maintenance until it's total breakdown. For more please visit www.gaslicht.com. Replace the wires into their clips and the new unit is ready to go. Otherwise known as a vapor pump, the compressor then sends the coolant out the discharge line and to the condenser. 1. June 2012 I'd say you've lost your start windings (burnt out somewhere along the windings, causing the windings to short together). Hi Guys, looking for some help with a fridge compressor.