Prevent Compressor Murder Part 2 w/ Emerson

HVAC School - For Techs, By Techs

Bryan Orr

Training, Careers, Airconditioning, Self-improvement, Hvac, Business, Education, Refrigeration, Heating, Ac, Apprenticeship

4.8 • 985 Ratings

🗓️ 24 April 2018

⏱️ 39 minutes

🔗️ Recording | iTunes | RSS

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Summary

Here is part 2 of the discussion with Trevor Matthews about the causes and prevention of air conditioning and refrigeration compressor failure.

Slugging occurs when the compressor attempts to compress oil or liquid refrigerant. A telltale sign of slugging is valve plate damage. On a semi-hermetic compressor, you can remove the screws on the head to access the valve plate. Wrist pin wear occurs during slugging the wrist pin is between the rod and the piston; you should test the wrist pin to see if it makes a knocking sound before you dismiss all other possibilities and replace the valve plate.

Overheating occurs when there is a system-related issue. Compression ratio is an indicator of overheating, but few technicians check it often enough. A requirement for external cooling and dirty condenser coils can cause overheating. Overheating also causes oil issues; when a compressor gets too hot, oil breaks down and loses its ability to lubricate the bearings.

Oil loss is a tricky cause for failure; it is hard to notice without a sight glass. Short-cycling can lead to oil loss over time, and bearings will begin to wear when there isn't enough oil to lubricate them.

Contamination usually occurs when moisture corrodes the copper plating and introduces acid to the system. Acid and sludge are the most common contaminants. Proper reaming practices also keep copper out of the system and reduce the risk of acid contamination.

Trevor also discusses:

Slugging in scroll compressors
Sight glasses and oil measurement
System load and suction pressure
Maintaining design compression ratio
"Blow by"
Oil separators
Replacing line dryers
Components to troubleshoot and inspect

Verifying System Operation Sheet from Emerson http://hvacrschool.com/Emerson

Verify Diagnosing Compressor Failures from Emerson http://hvacrschool.com/CompFailures

Transcript

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0:00.0	This episode of the HVAC School Podcast is made possible by our great sponsors and
0:20.1	partners which are Mitsubishi
0:25.1	and carrier are the two who have really stepped up to make the
0:28.8	HVAC school podcast and website possible. A lot of people ask me, hey Brian, how do you write all this stuff?
0:35.2	How do you have the time to make all these podcasts? Well the answer is, is that it's because
0:38.8	I'm Mitsubian carrier dog on it. I also want to mention a new company that I've been working with. You may have
0:45.1	listened to the podcast previously from Air Oasis and Air Oasis is a great company.
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1:05.2	They've got great research that's been done by Texas and I'm university on the products that they sell and they're just honorable human beings you just You just know when you talk to somebody
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1:43.7	But I'm going to encourage you to just take a peek at their website.
1:47.0	So if you go to air oasis.com,
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2:04.2	You can find that all at air oasis.com and what you're going to be struck by right away when you talk to
2:08.8	air oasis and when you go on the website is that it's not it just doesn't have a level of hype that you may have seen
	...

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