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  1. #1
    Join Date
    Jan 2005
    Posts
    159

    Charging via superheat...

    This spring, given the cost of electricity, I'm going to ensure I get top performance, by insisting that a technician charge my system via superheat calculation. I know that this is the most accurate method, but also takes a bit of special equipment, and some time.

    I fear that if I ask this, I'll get rolling of the eyes from those that don't love their jobs, shall we say. I know that talking about pricing is forbidden, but I've seen other solicit feedback & find companies to do work in these forums. If I'm out of line, let me know; otherwise, if you're in the Baltimore / Howard County, Maryland area, and would like to charge my system via the superheat method (straight A/C, no heat, no heatpump), then send me an instant message on the site here. I have a 2006 2.5 Ton American Standard 13SEER system.

  2. #2
    Join Date
    Feb 2008
    Location
    ooh my god im lost, Pennsylvania
    Posts
    25
    superheating is the proper way to charge the system with a folwrater or cap tubes, but with your equipment chances are very high that you have a txv valve, if that is the case whoever services your equipment should be doing a subcool.

  3. #3
    Join Date
    Mar 2005
    Location
    Suppy NC
    Posts
    4,513
    The odds of your system being low refrigerant are slim at best

    you should be also looking for someone that will do a good and complete service to your system and not just change the filter and check the refrigerant

    you also should want superheat and subcool reading
    just one reading tells only half the story

  4. #4
    Join Date
    Feb 2008
    Location
    Western NC
    Posts
    2,504
    Tink is right.

    You need to have the superheat and subcooling checked on your system to really know what is going on.

    Get a full service done by a reputable contractor. But don't tell they you want it charged. Its only 3 years old and chances are the charge is good. Tell them you want a routine service completed. When the tech shows up, ask them if they could check superheat and subcooling.

  5. #5
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,074
    I hope you mean check your systems charge.
    Since it was only put in like 2 years ago.
    Contractor locator map

    How-to-apply-for-Professional

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

  6. #6
    Join Date
    Jan 2008
    Location
    BAYOU LAND
    Posts
    697
    Quote Originally Posted by tinknocker service tech View Post
    The odds of your system being low refrigerant are slim at best

    you should be also looking for someone that will do a good and complete service to your system and not just change the filter and check the refrigerant

    you also should want superheat and subcool reading
    just one reading tells only half the story
    yeah,like tin says analyze the system properly using s.h. and s.c.
    also check the amp draw of the compressor
    refrigerant isn't getting any cheaper
    The government works for me. I do not answer to them, they answer to me.

    we need a few more sheep dogs to keep barking at the wolves,and the stupid sheep

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  7. #7
    Join Date
    Jan 2005
    Posts
    159
    OP here: Thanks for the replies. I was always a bit suspect of the charge of that new system. I walked up on the guy who was charging the system, and he had his refirgerant tank upside down & tilted to one side. When I spoke to him, he seemed startled.

    Did I mention that they installed *no* line dryer next to the outdoor unit, and they didn't hook up the condensate pump's cutoff wiring to anything; they are just naked wires sticking out of the unit.

    For these reasons, I believe they cut all corners...


    When I paid for the unit, the guy wanted me to make the check out to him personnally (he owned the company) -He said he was low on money. I looked at him funny, and he said, "Oh, it's my company - I'm not bull-crapping you..."

  8. #8
    Join Date
    Jul 2002
    Location
    Zelienople, Pa
    Posts
    2,965
    Sounds like a low bid job...
    How tall are you Private???!!!!

  9. #9
    Join Date
    Jan 2005
    Posts
    159
    OP: Well, There were only two contractors in this area who would do American Standard. I had someone come out for a Trane system, but he wanted to install what <b>he</b> wanted, and sounded insulted when i tried to suggest anything different.

    anyway; the system is in, so that's water under the bridge. What I understand is that given my system definitly has a TXV valve, a technician should check both superheat and subcooling? I thought subcoolling was only for heatpumps(?) and superheat was for A/C-only units with a TXV valve...

  10. #10
    Join Date
    Feb 2008
    Location
    ooh my god im lost, Pennsylvania
    Posts
    25
    txv valve is a metering device for the refrigerant, it maintains your superheat, so you could have an overcharge on your system and still have a good superheat,thats why it's important to subcool a system with a txv valve, to much refrigerant will give you excessive subcooling.

  11. #11
    Join Date
    Dec 2007
    Location
    Ohio
    Posts
    2,876
    I'm not sure what alot of these other guys do when they check a system like you are wanting to have done but the first thing I do is take a hose to it and make sure the outdoor coil is clean from things like leaves or dirt or grass clippings. Let the unit run for a while and then check my superheat / subcooling. Once that is verified I move on to inspecting the contactor, testing the capacitor(s), check amp draw on the compressor and the fan motor, inspect the fan blade for cracks or any damage, check and clean out the disconnect, check line voltage....I am sure there are a few more things I am not thinking of right now.....but if your tech isn't doing these things then he isn't doing you much of a service....just my 2 cents worth.....
    I need a new signature.....

  12. #12
    Join Date
    Dec 2005
    Location
    At work
    Posts
    2,441
    Dude, you need a new system.
    Luke 6:31

  13. #13
    Join Date
    Jul 2006
    Location
    Virginia
    Posts
    4,665
    while they are there have them blow the drain line

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