In this video Zack Psioda troubleshoots an non operational scroll compressor in a Trane HVAC unit. Zack goes step by step through the HVAC service troubleshooting process.
Gotta love the sledge. I have tried that soo many times. I know it will never work and you still would need to replace the compressor, but I still do it anyway. BTW, you need to hit it hard enough to make a good dent. It won't help but it is fun. As for reason for failure, low charge and consequent oil pumping or copper plating from poor installation are most common. Fun video. GFM
I've unstuck a fair few compys with a hammer, Large capacitor, or reverse rotation (in the case of 3 phase) but, as you said; still time to replace it. You consider yourself lucky that you got it cooling again for your customer and you order a new one as quick as you can!!
Thnx Zack for an informative video. Perhaps you need a harder wack at it w/ a rubber malet :o) My scenario is the opposite. AC compressor will not start & I get a really low amp draw < 2 amps during test. Is that possibly sign of bad compressor? The compressor is not shorted. Trying to determine if the compressor can be revived.
Overheated motor windings. Reason? Maybe the start capacitor doesn’t work or maybe a hidden run capacitor. Also I saw a tear down of the scroll compressors and that is where the motor core is attached.
Where is Annie! Cheepers, No Annie :) . Here I have an old Gould "Annie" A20 Hermitic analyzer that in can sometimes break a compressore free. It is an 1980's rig the one I have. It has several different caps inside and you try forward and reverse to break it free. There was a smaller A12 Annie for say refrigerator compressors and say window unit and small ac's too
I am suspecting that when you charge a copeland scroll with liquid through high side while under vacuum causes internal damage with the result being equalized pressure while running....If so why?
after replacement you have to check the charge and superheat at the compressor. When you recover the refrigerant, see how much you get out of it, if not much you might be low. Scrolls are great compressors but My experience Scroll compressors can't handle loss /low charge to well, especially loss of charge. Put hi/low press switches in if none are in it from the factory.
throttle bottle I can tell you're a rookie you wouldn't know how much oil is in it and you never add oil to a system. There's no sight glass on that compressor. Don't mean to insult you but after such a demeaning remark I can tell you don't have much experience in the field I've been doing it for 33 years now
then you should know what being low on charge does and scrolls are famous for washout and pumping the oil out into the system in such conditions ;) hence my "bah who needs oil in the compressor anyway" comment
throttle bottle I worked on semi hermetic up to 100 tons being low on charge you don't pump your oil out. Scroll compressors are excellent at raising the temperature of the refrigerant which is why when you're low on charge you going to run hot. It looks like the thing ran hot to me from the discoloration. Could be a restriction and I didn't see any low-pressure cutouts. Whenever I put in the compressor I was put in low pressure switches and I have with my own experience I've seen systems run with no refrigerant in them but the Scrolls can't handle it. All compressors pump out oil. Just Scrolls and well pump out oil under normal conditions. Replacement compressor comes with a full charge of oil. I've seen systems that have been overcharged with oil and it screws up the temperature drops like you can't believe. My favorite was when I had to pull out 5 gallons of oil out of a system that wasn't all that big maybe 7 or 10 tons semi hermetic how to keep draining the sight glass two 1/4 and just keep draining it out after letting it run. With all the excess of oil in the system the temperature drop was greatly decreased
Ben Kuxhouse what else can u tell us to prove ur technical experience. For someone doing this for 33 yrs, you sound extremely immature. The other guy made a simple sarcastic comment. I apologize that offended you so much. Maybe you should consider retirement!
"Knock, knock, knockin' on heaven's door" LMAO I believe this one has bought the farm, kicked the bucket and headed for the big Ingersoll-Rand subsidiary factory in the sky :) I'm no expert on scroll compressor internals but that seems to have gotten too hot to just be electrical resistance. That seems like insane over compression. Internal gas recycling? Restriction? All of the above?
Had one get so hot once it melted the label and electrics box off the compressor ZR90 7.5hp, would have been funny if we hadn't fitted it the day before.....
Previous company had replaced contactor, then we diagnosed faulty compressor and replaced, I was working on another system and apprentice fitted new compressor and contactor, when he'd finished and got it running asked him if he'd checked it which he said he had.... Turns out previous company had miss wired contactor so it would never turn off so when the compressor pumped down nothing would turn it off, gets into vacuum scrolls separate and bleed gas back which gets pumped again, eventually gets hot enough to melt! Apprentice never checked pressure switches would stop compressor and I never check he'd done it right, lessons learned all round that day!
Wass up. IMHO 😁as far as i kno n see on the field. Scroll Comps do not require Start Caps since they do not start under pressure,,,,,,Am i wrong about it??????? Anyone confirmed or is this a new Trane. Am Stan,,,,,thing. Tnks
