System Burnout Cleanup Procedures Class
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- Опубликовано: 21 июн 2021
- Bryan Orr, Eric Mele, and Joe Shearer teach the Kalos apprentices (and the RUclips audience) about System Burnout Cleanup Procedures Class. We cover the basics of burnout and dive into cleanout procedures. We also look at the Emerson-Copeland Bulletin AE24-1105 for some information inside manufacturer literature. You can read that bulletin at the following link: climate.emerson.com/CPID/GRAP....
Burnout is a type of compressor failure where there is electrical arcing. A short-circuit to ground or from winding to winding burns the oil and refrigerant in the compressor. Burning that oil and refrigerant results in acids, wax, and other nasty residues inside and around the failed compressor. (Keep in mind that compressors use POE oil nowadays. So, if you swap a compressor on a system with mineral oil, the replacement will likely come with POE oil.)
Burnout is especially common in cases where moisture remains in the system due to improper evacuation. So, pulling good vacuums is a preventative measure for burnout. Solid contaminants and mechanical failures may also lead to burnout. However, not all contaminants are related to burnout. Non-condensables also do NOT contribute to burnout.
Emerson recommends the filter-dryer cleaning procedure. Every time you open a system for service, replace the liquid line filter-dryer. (Make sure to use a bi-flow dryer for heat pumps. If you use Emerson dryers, Joe Shearer recommends using bi-flow dryers on heat pumps AND straight-cool systems.) Replace the suction dryers, too. Eric Mele recommends slightly oversizing the dryers.
Some sources may recommend using charcoal in HH dryers to eliminate wax. However, we generally prefer using EK dryers with the most desiccant and activated alumina.
You will also want to clean filters and screens. In many cases, you may straight-pipe the dryers from their previous locations and install them in new locations. Emerson also recommends using a moisture indicator or sight glass for the cleaning procedure. While that is a good practice, it is not always necessary, especially in residential applications.
With the dryers installed, you can evacuate the system. After that, start the compressor and put the system in operation.
The bulletin recommends operating and watching the unit for 48 hours. Like some other practices, this practice is feasible for commercial HVAC but impractical for residential HVAC. In those cases, you don't need to follow the bulletin procedures to a T for residential HVAC (but they are still good to do if you have the time, money, and resources). Using your best judgment and communicating with the customer to develop a plan of action is the best you can do.
At a minimum, however, technicians must go back and check the pressure drop across the suction dryer, especially if they choose to leave it in permanently. If the pressure drop exceeds 3 PSI after stabilizing, you must remove the suction dryer.
Acid inhibition (Acid Scavenger/Acid-Away) products for treating burnout are controversial. These products react with the burnout acid and should neutralize, but you can decrease the compressor's lubrication abilities if you add too much. In short, they work under some circumstances but can also make things worse under other circumstances.
We also discuss pipe wipers, accumulators, and aftermarket flush as they relate to burnouts, even though Emerson doesn't recommend those in its literature. Joe Shearer doesn't necessarily like to have a suction dryer in the system at all times, but he replaces the suction accumulator when he cleans up burnouts. If the system is a heat pump, the reversing valve can also be affected by burnout or get in the way. So, it's best to pay attention to accessories on the suction line near the compressor inlet.
On the electrical side, make sure to replace the contactor and capacitor after a burnout on a single-phase unit. Check what the new compressor's capacitors are to make sure you get the correct one. Demonstrate extra caution when replacing the contactor if you have a crankcase heater. You can also make burnout worse if you keep resetting the circuit breaker without isolating the true cause of the burnout and attempting to fix it. Each time you reset the breaker, the short and arc will happen again and cause more burnout.
In the end, there is not a single one-size-fits-all solution for cleaning burnout, but it is important to discover why the compressor failed in the first place and prevent it from happening again.
Read all the tech tips, take the quizzes, and find our handy calculators at www.hvacrschool.com/. 
Развлечения
Great video. On sealed systems appliances I prefer the sporlan catch all driers over the pencil driers.
Great video. You are master in hvac I hope you will keep making videos
I love the Bryan vs Joe debate. 😅 I lean more to Joe's side!
HVACR, Bryan, have you not found a system with acid in and then done an experiment with acid away then test the oil ,?
In my experience as a non HVAC tech, if you experience a burnout ,bight the bullet and replace the condensing unit,line set and evaporator or the whole unit if it is a package unit. The HVAC service companies that do what is called for from Copeland are unicorns. Most come in and blow and go.They don't clean or replace the line set. They typically put filter/dryers in and never come back to check or change them. About two years down the road you will have another burnout. At today's labor rates, in my opinion, it is just not worth the expense and hassle. I have three of these experiences in my life. All have been with heat pumps, never a burnout with a straight air conditioner system. I wish that it was possible for me to never own another heat pump. Heat pumps are the greatest thing to come along for the HVAC service and sales companies. Lots or year around work.
can you make a similar video about how to clear liquid line restriction that is not due to filter dryer
Always vacuum tru a high acid filter (CYA)
42:29 - If a vacuum pump is connected to a system that contains acid or other solvents (as in a Chemistry Laboratory), those will definitely be drawn directly into the oil if not mitigated with a cold trap of some kind.
It happened to me
Use your tools. What is the vapor pressure of the acid that happens in a burnout? If you run a vacuum lower than that vapor pressure or the system is warm because you have a heating blanket on it, it will happen faster. Too lazy, tired or overworked to check the answer for yourself, OK, change your vacuum pump oil and the other thing, change your vacuum pump oil. The cost of too many oil changes is far cheaper than the cost of a good pump.
If you’re changing a compressor then put in a new txv. It really doesn’t cost much. That’s the best practice
I really have to ask. I did a flush on a 404A , captube , 3 door display freezer and I am wondering if leftover flush would cause a high suction pressure and superheat? After flushing, this 404A system is running between 30PSIG and down to 25 at system is satisfied. It is running good superheat when its satisfied.
Hilmor or Supco lineset cleaning kit?
The sporlan dryer pdf page 4, says that acid is usually present as a gas in the system
80% of electrical failures is due to mechanical failures.....courtesy of Trevor Mathews master class on compressors
Dude had fake Fluke leads or some odd ball specialty leads. I've never had a set of Fluke leads that had any issues that weren't caused by poor treatment.
First it's CYA ( cover yo ass) have to price in all the clean up , drier swap outs, returns for system inspection, anything else U can think will be nessasary TO CYA.