The fan just ran. The other side of the contactor goes to R on the compressor and one side of the capacitor. I have a compressor and when i try to connect it,I got confused. thermostat is ok and even i changed with new one. Enter your email address to subscribe to this blog and receive notifications of new posts by email. An automotive air conditioner's pressure switch cycles the vehicle's compressor on and off when the refrigerant pressure falls below an acceptable level. Thousands business rely on If the start relay fails, the compressor will sit there trying but failing to start and drawing locked rotor (LR) current. I think its a bit late to ask a question, however i have a compressor and the reading is C-S = 18ohm, and C-R 17 ohm, my question is, is it ok for the compressor to have almost same resistance between starting and running winding ? If the compressor passes the above tests, take a multimeter set to R x 10,000 (10K) and check each winding to ground. Internal windings? I have never had to worry about an electricians side at the breaker panel but is there something I need to look for there with the line voltage? Could also have stuck TXV (either open or closed) causing liquid flood back or creating a “pump down” situatiuon. Change ), You are commenting using your Facebook account. Could the compressor be bad even though all of the readings look good? The other two pins are connected to what looks like a plastic connector with a small coil of thick wire. Take one probe from the meter and find a good ground. The compressor should be replaced. The compressor may make a humming sound, that may increase in sound level over time. The current drawn is about 17.6 amps, tag says max current is 6.5 amps. external relay is good resistant is cr=9.9 cs= 27.1 rs= 37.0 is ok. in my view compressor got over heating because when it cooled down to appropriate temp it started but it took long time to cool then it went off after 20 minutes. Actually. Lastly, verify that you have the proper voltage to operate the compressor.0 It has to do with a whole lot of things if it was working and then the compressor isn't working. Should I get a two or three wire hard start kit for my compressor? In order to determine the exact cause of a compressor malfunction, manufacturers say thorough and accurate diagnostics are a must. ZERO ohms indicates a dead short. I dont understand which one is start run and common.Please advise a way find out. A PTCR can take anywhere from 5 to 10 minutes to reset. I guess it is obviously not normal, but I wonder whether there can be any other explanation. When I turn on the unit, the compressor kicks in and then blows the breaker about 10 seconds later. If you are not a contractor, I would suggest you contact your local HVAC contractor to perform a thorough diagnostic. My best guess is there is a txv issue. Some where you have a “high side restriction” so definately look at the txv. What does it look like happened? S-C – 0.46 High Source. I changed start relay and overload relay and still get clicking sound and compressor does not start. You could have a “stiff” compressor. It has a run capacitor that is good. Rheem with TXV Keep the default options (they do a great job!) It is possible that non condensables be freezing and thawing at the TXV thus causing the hunting. Unequal pressures can prevent a compressor from starting. Since C-R is .13 and C-S is .46 S-R should equal .59. C+R= .05 S-R = 3.8 and C-S = 2.1 then C-R should = 1.7 or less. All my reading looks good and it is not grounded. I have a Danby small refrigerator and the compressor ohms out to 0.00 on all terminal so is it bad I don’t get any other readings. The Compressor is single phase, low starting torque one. If the compressor ohms out correctly to ground and between windings, then you could be looking at “locked rotor” in the compressor. Optimize and compress your jpeg and png images online. Check with the compressor manufacturer to see what is an acceptable meg-ohm reading. in continuity test cr show positive and cs show no continuty and same way rs show no continuity. Luke. This might just mean a whole new unit for me unfortunately. If still ZERO — you compressor is shorted between the windings. HPDAVV High Pressure Air Compressor - 3HP - 110v / 60Hz / 1ph - 2.5cfm @ 4500 Psi - Scuba Tank/PCP Rife/Paintball Air Gun Filling Station Adjustable Digital Gauge Control 3.7 out of 5 stars 22 $989.00 $ 989. The resistance (ohms) between Start and Run will be the highest reading. This means that doing a high voltage meg test, or any running Tried a different breaker, replaced wire from panel box, tried separating compressor and condenser fan, checked capacitors, fan was replaced and has separate run capacitor. When you say it does not work, what is it doing or not doing? How would I wire the hard start kit? ( Log Out /  Or recover the refrigerant and pull a very deep vacuum (min 500 microns) and then check the windings. Fauly solenoid allowing flood back is possible. Make sure the run capacitor is still good also. you are probably on the right track. If it is a recip compressor, and it starts, you can leave it like that. Smoke appeared at the breaker or at the compressor? My start capacitor readings are good too.. Then find out why the compressor “locked up”! The high efficiency motor allows for easier cold weather start as low as -20 F (-29 C) and extension cord application up to 400 ft. of extension cord. You should have an infinite OL resistance to ground. Got a call saying there is no power to the room and that the breaker has tripped.. Compressor surge is a form of aerodynamic instability in axial compressors or centrifugal compressors. You could try checking with the compressor manufacturer. Try it on you LOWEST OHM setting on your meter and see what it reads. The clue is in the name – it compresses the volume of audio (in layman’s terms). Compressor does not ohm to ground, c-s = .06, c-r= .05, r-s= .09, I had to install a lug kit on this compressor about 3 years ago, it burnt the terminals off the wires. Why do you think you have lost a leg? Again, if there is a variance in the readings, there could be an internal short in the windings.Â. pressures were very normal when intitially tested and fitted compressor.. Is it possible that too much liquid has flooded back to the compressor through a faulty solenoid? Item Price: $359.95 N850 RCF N 850 2" Throat High Freq. One of the techs that i work with thought that the wires going from the contactor had gotten mixed up during installation and tried swapping them around to what he thought was correct. Thanks.. remove the start relay and start capacitor. Windings to ground? Since C to R should read at least 1/2 of C to S, would it be reasonable to say that the Run winding is open? we have 250 kilowatt compressor motor .what resistance should i be getting ..I have done an insulation resistance test between windings all where clear…and Im getting 1 ohm on each winding…is it okay? that is much help that is needed. if the compressor is a single phase compressor, C-R should be lower that C-S. Hi there i have a problem with my compressor i got a resistance reading from (s-r) only and rest of the terminal like (c-r) and (s-c) is totaly zero is my compressor is totally bad? my refrigerator compressor start after few sec compressor stop.i check the continuity b/w compressor pin and ground no continuity and check resistance b/w pin top right to bottom 15ohms and top left to bottom 14 and top left to top right 29ohms.capicator also show voltage 5volt.relay also seen to be good.what the reason to run the compressor? We offer a wide range of products, including information displays, digital signage for advertising, commercial system air conditioners, VRF systems & tailored Hi, I’ve got a Trane XE 1200 with a Copeland CR47KQ-PFV-980WB compressor inside of it. Would that be recommended? What voltage do you have at C and R at the compressor? The wiring diagram shows the typical two windings in series (with a center tap) so I wonder chat kind of short would result in these readings. Thanks for the help! Video explaining how to test the compressor if you have a refrigerator that is not getting cold. I hear you can hook up hard start kit to give the compressor a boost before start up. Hi I’ve recently installed a new 3 phase compressor, contactor and thermal overload for a freezer room. If your ohm readings are above 30, it means that your compressor motor is likely faulty and you’ll need to get it replaced. On an Rx1 scale, if all the readings are the same with all the wires removed from the terminals, then you probably have a failing compressor. Three cables comming from pannel brown black and blue. Engine power derate. you need to use a meter that you can set the scale to R X 1 and then do your readings between the windings. You will be using the ohms function on you digital multimeter to troubleshoot the compressor, and having power applied to the circuit under test gives false readings and damages the meter. Thanks again.. the easiest is a super boost type the is just 2 wires and piggy backs onto the run capacitor (Supco SPP5). I assume that means bad compressor. MI mechanical license since 1998, 99% residential experience. I work for a hotel and recently became universally certified. It was a costly unit and was only used for two seasons. To support this, we have developed products for Compressor & motor. The “fractional” readings you are getting do not match any data. The Husky 20 Gal. After we flipped the disconnect that time the compressor wouldn’t kick on. I have an older unit. So, when you need to compress a large pdf while maintaining high quality images, do not hesitate to use Zonepdf Efficient Ways To Compress PDF Online Large presentations or reports that cannot be sent by the majority of data storage services can cause great troubles in terms of time efficiency and smooth process running. does this mean i is a bad compressor?when I do the ground though it shows it ok. Did you check the capacitor and verify that it with in the printed range on the capacitor? The problem is with compressor trying to start, and cannot, and as I mentioned I already changed the PTC, which works in place of the start capacitor and the relay in other systems. is this acceptable? High This Mode is lossy compression and can compress your image up to 70%.Use this option if your image is in high quality with a size between 1-2 Mb(recommended). Are your capacitors good? if the compressor ohms out good, then it is probably one of thos external components. Online UniConverter (originally Media.io) is the best online audio compressor to compress audio online and free. I also checked the line voltage, gas charge,capacitor and condenser coil, everything is ok. Could you suggest any tips to identify the problem for the high current issue. I can hear it click and current draw then 2 seconds later it clicks off. My freezer will not turn on at all. I reset the breaker and it trips straight away.. Identical but high ohms on compressor. A heating and air specialist may be able to repair the broken compressor motor instead of having to buy an entirely new compressor… The compressor runs off standard, single-phase, 60 Hz 120vac. Did you test the compressor to ground. Thought it would most likely be the defrost element but thought I’d check the compressor anyway and I’m getting 11.5 Ohms between all terminals. We put in a brand new copeland 3 phase semi-hematic compressor today and when charged it and started it we were getting high head pressure no matter what how we tried to remedy it. The compressor was installed 1 week ago. I pulled a cross reference guide for the model number to find out the tons. The contactor is working properly (as far as I can tell) and I have voltage on each leg coming and going off of the contactor. ( Log Out /  I guess since it's a brother of a friend the reality of it is he's trying to save money by not calling a company out that would want to get paid full price so he bothers you in your free time. Léon Creux first patented a scroll compressor in 1905 in France and the US (Patent number 801182). I’m assuming my problem lies within these parts, but I don’t seem to find any recplacements online. Compressor control circuit High-pressure switch Low-pressure switch I get 0 ohms between compressor windings. Try switching 2 of the wires in the compressor to reverse rotation. If you get 0 ohms between all the windings and you are reading them at the compressor terminals WITH THE WIRES REMOVED, your compressor windings are internally shorted — bad compressor. I cant find nothing grounded either but It’s blowing the fuse instantly. Thank you for your quick response! How to check ptc relay and capacitor? R/S/C-Gnd – Inf. Your readings are close enough that I do not feel there is an issue with the motor in the compressor. If it is a scroll compressor, if you get it to start, you WILL need to change the wires back since scrolls only work in one direction. A/C Compressor Clutch Coil Test An A/C compressor clutch coil is a simple device made of fine windings of wire wrapped into a coil. What I’m seeing is the following: R-S – 0.46 Then you need to check your sh and sc to make sure your refrigeration side didn't have anything to do with your comp failing. How did you get your readings if cs and rs show no continuity?. Or non condensable? Accessories � Pumps, Cooling Towers, Evap Condensers, etc, Components � Valves, Motors, Condensers, Evaporators, etc, Duct Systems Design, Installation & Practice, Piping Systems Design, Installation & Practice, Control System Design, Installation & Practice, Welcome from the Editor & Electrical Forum Rules, Pro's Forum: National Electrical Code (NEC), Pro's Forum: Calculations & Electrical Theory, Pro's Forum: Electrical Business & Marketing. Yes, an undersized power cord was probably the problem creating a power drop. Readings between windings should be done on your R X 1 scale. The conclusion is that while this phenomenon can happen in ANY compressor, it is made more likely in a scroll due to tighter tolerence and “motor down” configuration. It's either grounded or not. The overload is wired in the common leg and will prevent the compressor from running if tripped. 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