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  1. #1
    Join Date
    Jun 2008
    Location
    Phoenix, AZ
    Posts
    70

    Cool New Carrier straightcool

    What do you guys think about a spilt carrier straight cool, that has been vac and micron gauged, with a weighed in charge put in, but only has a 10 degree split at the evap coil? Subcool was ~40 degrees with ~8 degrees superheat. I tried to purge the unit to lower the subcooling to 16 then to 10 then 6 degrees but has no effect on the temp. split. No restrictions in filter drier, so does it have to be the TXV or is there another option?

  2. #2
    Join Date
    Jun 2005
    Location
    SW Wisconsin
    Posts
    5,033
    You are not telling us what the actual pressures were.
    I don't know how you could purge from 40-F to 6-F Subcooling. (?)

    How much airflow do you have & how high is the humidity.
    Could it be pulling hot moisture laden air from the attic into the return.

    At 400-cfm per/ton of cooling, an 80-IDB & 74.5-IWB will produce around a 10-F SA/RA delta-T split. What were indoor conditions?


    Maybe the airflow is 475 to well over 500-cfm per/ton of cooling, it can happen with wrong speed selections, & the new powerful & sometimes oversized air handlers.

  3. #3
    Join Date
    Jun 2008
    Location
    Phoenix, AZ
    Posts
    70
    Humidity is low as I am im phoenix, arizona. pressures were on the low side 53 degrees or ~135psig and 135 degrees on the high side or ~500psig. After I put some 410a into my recovery tank to get the subcooling down pressures were at 125/420 indoor was 81, outdoor was 118

  4. #4
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    What model and serial number?

    Might want to do a static pressure versus temperature test to see that the refrigerant is pure.

  5. #5
    Join Date
    Jun 2008
    Location
    Phoenix, AZ
    Posts
    70
    I thought the person who did the start up left nitrogen in the unit or ... so I pulled a good vac and weighed in my charge.. the right way or so I think.. both the condenser/coil are 6 months old... model number coil CNPVP6024ACAAAA, condenser 24ABA360A320, the unit next to it is identical.

  6. #6
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,789
    R410A at 135 PSIG has a sat temp of roughly 48°F.

    Get all the readings, not just is was 135 psi suction line.
    Also need all the temps.
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    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

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