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Thread: Carrier Infinity system - shows incorrect temp and not cooling properly

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  1. #1
    DIY Member Pickngrin's Avatar
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    Default Carrier Infinity system - shows incorrect temp and not cooling properly

    We just purchased a home that has a Carrier Infinity system. We were in the house yesterday and the thermostat read 80 degrees, although it did not feel quite that warm in the house. I manually set the temp to 74 degrees and even though I could hear the fan running and air blowing, the house did not cool off significantly several hours later. I stuck a dial thermometer in the air vent and it read 72 degrees. Should the temp of the conditioned air been lower? I realize that there are many variables and that no one can give me a definitive answer, but I just wanted to ask what things I can check out before calling an HVAC tech. I do know that I have to change the filter (during the inspection, the inspector told me that, but he was unable to test the ac system because the outdoor temp was low at the time). All other systems in the house have clearly been well maintained and the sellers said that the ac system was working properly last summer.
    Any suggestions?

    Thanks.

  2. #2
    Plumber jimbo's Avatar
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    The air coming out of the vent should at least 10 and probably closer to 20 cooler than the air at the return vent. Dirty filters, dirty coils, indoors and out, and duct leaks in the attic, if you have such, are all candidates.

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    DIY Senior Member Runs with bison's Avatar
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    If it still has trouble after the filter is changed, then there is a fair chance that it is low on refrigerant. I lived in a house for 12 years that required a refrigerant top off once/year.

    When you said that fan was running and air blowing, did you also verify that the compressor and condenser fan outside were running as well? Sometimes these do not come on when they should. (It sounds like yours did because of the temp difference.) I've had trouble with relays/contactors before in 2-different homes and they were replaced...and in a third home I had to bang on the AC's electrical box a bit to get things running--had some mud dauber issues apparently.

    One other thing worth checking: new batteries in the thermostat can sometimes work wonders. I've had older thermostats act really funny when the batteries were low and they had no low battery indicator. Either the system (heat or cool) would run all the time, or not at all.

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    Plumber jimbo's Avatar
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    [QUOTE=Runs with bison;308779........ required a refrigerant top off once/year.

    .

    .[/QUOTE]


    refrigerant "top off" is neither legal, reasonable, or smart. If a system is losing that much refrigerant, there is a leak somewhere which can be found and fixed. Certainly after visual inspecitons of filters, coils, etc, a tecnician should get a set of gauges on there to see what's up.

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    DIY Senior Member Runs with bison's Avatar
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    Quote Originally Posted by jimbo View Post
    refrigerant "top off" is neither legal, reasonable, or smart. If a system is losing that much refrigerant, there is a leak somewhere which can be found and fixed. Certainly after visual inspecitons of filters, coils, etc, a tecnician should get a set of gauges on there to see what's up.
    If was legal at the time, and may still be today depending on loss rate. Wasn't my choice as to whether to find the leak and fix it, the owner didn't mind spending the money for the top off each year rather than replace the system. The HVAC guy and I both recommended replacing it, but freon wasn't that pricey yet.

    Rules have gotten stricter on this (and I'm all for that) but as I recall even 8 years ago it could still be charged as long as it wasn't exceeding some annual threshhold.

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    DIY Member Pickngrin's Avatar
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    Thanks for the responses. I changed the filter and the ac performance appears unchanged. The compressor fan outside was indeed turning on. Neither of the two metal lines coming out of the compressor felt cold to the touch. Would that point to a low refrigerant level? I will be calling an HVAC tech to take a look and of course I do not want to get hosed.

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