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  1. #1
    Join Date
    Sep 2007
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    Just North of Dallas, Texas
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    R744 Pro's and Con's for HVAC

    I was reading about the use of CO2 for refrigeration and wondered if there was any inroads being made to use this as the next refrigerant of choice for HVAC?

    Would this be a boon to heat pumps?

    Could this refrigerant be used in the current generation of scroll compressors?

    Inquiring minds want to know ....

  2. #2
    Join Date
    Jan 2004
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    PA
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    68,793
    No, current compressors could not be switched to R744.

    Currently, as bad as it may sound. I wouldn't trust the average service tech to work on a R744 system.
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  3. #3
    Join Date
    Sep 2007
    Location
    Just North of Dallas, Texas
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    Quote Originally Posted by beenthere View Post
    No, current compressors could not be switched to R744.

    Currently, as bad as it may sound. I wouldn't trust the average service tech to work on a R744 system.
    Been

    I understand there is a pressure problem with 744 but as I understand it it's more efficient and less damaging for the air quality folks.

    I was told by the guy that installed my new HVAC that the industry was looking at a new refrigerant replacement for R410.

    I like to research and understand newer technologies ....

  4. #4
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    Jan 2004
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    PA
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    The guy that installed your R410A system. Did he give you a choice between 22 and 410a.
    Many people are not happy that 410a is being used. And they want to believe in things that aren't true.

    R717A is more efficient then 22 or 410A, and you won't be seeing much about it being brought back.
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  5. #5
    Join Date
    Sep 2007
    Location
    Just North of Dallas, Texas
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    Been

    The guy was very upfront about the R22 and R410. The R22 systems were slightly less expensive.

    I went with the 410 unit. It has performed admirably with this years Hot Texas weather. My bills have been significantly lower and the home is comfortable.

    So whats R717A? I seem to remember him saying something about it. He did say that R410 requires higher pressure than R22.

    Thanks for the info ...

  6. #6
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    Jan 2004
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    PA
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    Amonia.

    What do you call upfront about the gasses.
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  7. #7
    Join Date
    Sep 2007
    Location
    Just North of Dallas, Texas
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    97
    Quote Originally Posted by beenthere View Post
    Amonia.

    What do you call upfront about the gasses.
    The installer explained the differences between R22 and R410 cooling capacities as well as the fact that R22 was being phased out.

    I'm a tech nut and like to read about various newer technologies. I understand that CO2 refrigerant was out a long time ago. Also, we had some old ammonia unit in my restaurant. It was a shame to decommission them for the newer types.

    Thanks for the clarification ....

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