Manufacturers of refrigerants, controls, and other suppliers distribute hundreds of thousands of pressure-temperature charts to the trade every year. It would be rare indeed to find a service technician who could not put their hands on a pressure-temperature card at a minute’s notice.

In spite of the widespread availability and apparent reference to the pressure-temperature relationship, very few service technicians use the P-T chart properly in diagnosing service problems.

The purpose of this video is to not only demonstrate the proper use of the pressure-temperature relationship, but to also illustrate how it can be used to thoroughly analyze a refrigeration or air conditioning system.

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24 thoughts on “How to Use a P-T Chart

  1. John P says:

    At 11.45 the pressure is shown 158 psig at compressor suction inlet. Actual measurement should have been 16 psig. Overall this was a great informative video. Hatsoff to sporlan. My request is to also upload a similar video for R404A as it is now widely used.

  2. Ryan Marshall says:

    Awesome! very good video. Thank you for explaining. I've scoured youtube and the interernet and now with this visual, I finally have some clarity. Good visuals make all the difference. Thanks for that and using layman's terms.

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