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  1. #1
    Join Date
    Sep 2007
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    Glide = big A whereas No glide = Little A?

    Hi Guys.
    I was logging a recently installed Carrier Chiller today.
    Which Has the refrigerant details listed (On Data Plate) as R410a.

    However on my most recent comparator the R410 is listed with a Capital A!

    All the other refrigerants with a Capital A have the Bubble and Dew options

    The R410 option does not.

    Is this because the difference between the bubble and dew point is so small?

    Or is there another reason why it has a capital A.

    I know this was answered a long time ago, but I have forgotten the answer.
    Thanks Grizzly

    Despite the High Cost of Living it still remains Popular!

  2. #2
    Brian_UK's Avatar
    Brian_UK is online now Moderator I am starting to push the Mods: of RE Site Moderator : and general nice guy
    Join Date
    Mar 2001
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    Re: Glide = big A whereas No glide = Little A?

    Zeotropic mixtures shall be assigned an identifying number in the 400 series. This number designates which
    components are in the mixture but not the amount of each. To differentiate among zeotropes having the same
    components with different amounts (percent by mass), an uppercase letter shall be added as a suffix.
    The numbers are in chronological order of the refrigerant’s approval by ASHRAE.
    Example: R407A (R32/R125/R134a (20/40/40)), R407B (R32/R125/R134a (10/70/20)), R407C
    (R32/R125/R134a (23/25/52)), R407D (R32/R125/R134a (15/15/70)), R407E (R32/R125/R134a (25/15/60))

    Taken from the International Institute of Refrigeration.
    Brian - Newton Abbot, Devon, UK
    Retired March 2015
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