Monthly Archives: July 2013

Refrigerant Line Charge Adders

I am often asked how much refrigerant should be added to a split system?  We preach that the best way to charge a new install is to always WEIGH the charge into the unit. Well, that varies from manufacturer to manufacturer.  … Continue reading

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MCA and MOP — What are they and How are they Calculated?

On commercial equipment, there is some information on the data plate  of the unit that has to do with safely wiring and protecting the equipment.  These ratings are the MCA and MOP. To start this discussion, we first need to know what … Continue reading

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Compressr Change-outs — Addendum

I almost forgot to mention one more part that is very important and that is — What type of refrigerant is your system?”  When I first started in this industry, there were systems with R-500, R-502, R-12, R-22 and a few … Continue reading

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Compressor Change-outs

Too often, I get the phone call that a replacement compressor is “bad out of the box”! Now, I won’t say that never can happen. However, it is even more suspect when the contractor calls and says the replacement compressor for … Continue reading

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Hot Gas Bypass – Revisited

One of the most read post on the site is the one Posted on April 6, 2012  titled WHY USE HOT GAS BYPASS?   Because this is one of the most read postings (over 1,900 views to this one alone), I thought … Continue reading

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Basic Air Conditioning Piping Recommendations – Liquid Lines

As promised (I’m back from vacation), this post will discuss Liquid Lines.  But before I do, I forgot to mention something during the discussion on suction lines that also applies to liquid lines.  When we talk about pipe sizes like 1-5/8 inch … Continue reading

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