Reddit mentions of Commercial Refrigeration: For Air Conditioning Technicians

if you add 50psi of gas to a system at 70f, it can't magically get to 200psi at 70f while nothing is running. while the 50psi may change a bit with temp and pressure, it cant suddenly gain 100psi+.

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your pt chart shows you the saturated conditions when liquid and vapor are in the system and at a balance for the temperature, ( this is why a pt chart doesnt work for superheat or subcooling but allows your to find both.) . if the system is under charged it will be all vapor so a pt chart no longer works.

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instead of wasting time worrying about what your gauges say, pull out your reclaimer, pull the charge into your recovery tank, weigh it. this will let you know very quickly what the charge is. as you knew the old charge you will know instantly if there is a leak. if its fine add the recommended charge to the unit as per the manufactures recommendation.

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buy this book and give it a read, it can help a lot with simple things, its very well written and easy to understand / look up issues in.

https://www.amazon.ca/Commercial-Refrigeration-Air-Conditioning-Technicians/dp/1428335269




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Large text book, covers everything you could ever want to know.

https://www.amazon.com/Refrigeration-Conditioning-Technology-Bill-Whitman/dp/1111644470/ref=sr_1_1?ie=UTF8&qid=1500075961&sr=8-1&keywords=modern+refrigeration+and+air+condition



This book is amazing, it will talk about everything refrigeration based, has a chapter on everything, lots of great pictures, dumbs down every peice of equipment. you will look like a pro if you read this book a few times.

its always in my van, most questions i can answer with it.

https://www.amazon.com/Commercial-Refrigeration-Air-Conditioning-Technicians/dp/1428335269/ref=sr_1_fkmr0_1?ie=UTF8&qid=1500075993&sr=8-1-fkmr0&keywords=refrigeration+for+airconditing+technicians