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  1. #1
    Join Date
    Aug 2004
    Posts
    19

    Mixing 4 ton condenser unit with a 3 ton W-coil

    I have a 3 ton system cooling my shop that the compressor died on the outside unit 3-4 weeks ago. I have a pal that can get me a free 5 yr old Tempstar 4 ton condenser outside unit. Can I use that and leave the 3 ton W coil in the air handler and have it not freeze the W coil, etc?

  2. #2
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,167
    No.
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    How many times must one fix something before it is fixed?

  3. #3
    Join Date
    Nov 2008
    Location
    port-land OR
    Posts
    111
    no not at all.

    but if you took that 4 ton unit and put a new 3 ton compressor in it it would work. so long as its not a heat pump. the increased condenser size will increase efficiency when used with a condenser temp based condenser fan variable speed control. i think theyre about $ retail or so.

    although its not free, and if your guy isnt a pro may end up being nothing but problems forever.

    id personally suggest buying a new unit with a warranty. and if your indoor unit is more than 15 yrs old replace that too. and get proper filtration and ventilation for a shop environment. most shops dont get the attention they deserve, and it ends up costing the owners 10 fold. very sad.
    Last edited by beenthere; 09-27-2009 at 03:27 PM. Reason: Removed price

  4. #4
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    68,167
    After all that to make it work. A new unit would be cheaper and more reliable.
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  5. #5
    Join Date
    Aug 2004
    Posts
    19
    When I say shop I do not mean a business shop. I mean a 30 x40 building behind my house on an acreage. I can turn the lights off and not go out there for weeks if I choose. How can new unit be cheaper than free?

  6. #6
    Join Date
    Mar 2005
    Location
    Houston, Texas
    Posts
    11,873
    Quote Originally Posted by philw View Post
    When I say shop I do not mean a business shop. I mean a 30 x40 building behind my house on an acreage. I can turn the lights off and not go out there for weeks if I choose. How can new unit be cheaper than free?
    By all means, have it installed. But, when it doesn't work, don't get upset.
    That "free" unit's gonna cost somebody.

  7. #7
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,167
    I was refering to all the things gmc said to do to make it work.

    If you want to install that 4 ton. Get a 4 ton indoor unit.
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  8. #8
    Join Date
    Jun 2007
    Location
    Round Rock
    Posts
    3,569
    It may or may not work. As long as you realize this going in, then you'll be ok. At the very least you need a txv installed on the evaporator coil. I've done strange stuff like this on occasion to help somebody out. I've had mixed results.
    I like DIY'ers. They pay better to fix.

  9. #9
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,747
    is it something that will run for days at a time or only while you are working out there?


    if it is only going to be used occasionally i would get as much airflow as possible and put in a txv.

    if you have problems with coil icing throw on a freeze stat and time delay.

  10. #10
    Join Date
    Sep 2002
    Location
    Northeast Ohio
    Posts
    4,842
    Man, tuff call. Free is free I guess. It may or may not work, for sure it won't be optimum. TXV for sure, maximized air flow on existing blower section. Still some cost involved what with refrigeration cost, TXV, freeze stat and such so how free will it be?. I wouldn't want to be the one trying to balance the charge. Guess it's your call.
    A good HVAC tech knows how, an educated HVAC tech knows why!

    DEM


  11. #11
    Join Date
    Aug 2004
    Posts
    19
    guess I need to add more details to free. My pal works as an HVAC tech at a huge appartment complex with over 6,000 units. free= free...

  12. #12
    Join Date
    Mar 2005
    Location
    Houston, Texas
    Posts
    11,873
    Quote Originally Posted by philw View Post
    guess I need to add more details to free. My pal works as an HVAC tech at a huge appartment complex with over 6,000 units. free= free...
    I'll bet ya, you won't be pals after the install.

  13. #13
    Join Date
    Aug 2004
    Posts
    19
    ah, he has all day every day to do whatever he wants with no boss. Gets a new Superduty F350 diesel every 2 years, loaded with new plow and Weatherguard tool boxes. He is remodeling an old Victorian 3 story 5,000 square foot home right now. You dont do that alone with a normal job. Working for a very Rich Uncle with that much comercial property has advantages.

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