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  1. #1
    Join Date
    Apr 2011
    Location
    michigan
    Posts
    170

    Coleman Mobile Home Furnace

    I have a customer with a Coleman mobile home furnace about 2,100sq ft. 3 ton a/c system complains about not enough cooling says thermostat is never satisfied at 75. The condenser is clean filters clean, charge looks fine, customer wants a larger a/c unit. I told them 3 tons should be enough but their blower is only 1 speed. I am quoting them an upgrade to a 3 speed fan rated up to 4 tons instead of a whole new a/c system, has anyone upgraded the blower on a mobile home like this and had good results?

  2. #2
    Join Date
    Apr 2012
    Posts
    44
    Mobile homes suck, I've seen 3 tons in 1000 sq ft doublewides run nonstop to keep up. That one had a west facing slider door that I think was made from a magnifying glass lol. Anyway, I have no doubt that a 3 ton can't keep up, especially if home has a lot of sun exposure.

  3. #3
    Join Date
    Jul 2006
    Location
    Virginia
    Posts
    4,608
    Is the coil clean as they might look clean but can be impacted

  4. #4
    Join Date
    Mar 2007
    Location
    NW AR
    Posts
    2,478
    3 tons is way too small for a 2100 sq ft mobile home.

  5. #5
    Join Date
    Mar 2001
    Posts
    1,482
    Here 3 ton will do 1800 sq. ft. Our average summer temps are in the lower 60s, and upper 70s with 100% humidity. We seldom use A/C, mostly HPs. Have done add on coils and installed systems on existing MH furnaces. Usually change blower motors to 3 spd. 1/3 or 1/2 horsepower motors. Because of duct restrictions, it's a bear to get proper performance from the furnaces in "Wobbly Boxes." Used to do the wet finger test for years, but have had to get a little more sophisticated, since the guvment got involved in federal HP programs.
    One way to outthink people is to make them think you think. They'll think you're not really thinking what you're trying to get them to think you think...........

  6. #6
    Join Date
    Apr 2011
    Location
    michigan
    Posts
    170
    Yes the coils are clean, I just washed the condenser, and the evap is spotless. I could go to a 4 ton system but will still have to upgrade the blower, and that is the largest blower available for that furnace. I am sure the single speed one they have is not moving enough air, so I thought I would start there and if they still are not happy I can go to a 4 ton system. When I was at the home it did not feel to bad to me and seemed to be satisfying the stat.

  7. #7
    Join Date
    Jan 2012
    Location
    WEST COLUMBIA S.C.
    Posts
    278
    the system is to small.

  8. #8
    Join Date
    Oct 2009
    Location
    Raleigh, NC
    Posts
    790
    What are the operating parameters of the system? Superheat/Subcool? Is the evap being fed with enough refrigerant?

  9. #9
    Join Date
    Dec 2003
    Posts
    259
    The home must be an older model due to only having a 1 speed fan and the Insulation factor is small. 3 tons (a/c only) seems about right for the area you live in (Michigan) should only struggle on hot days. The area I live, for a 2100sqf would be a 4 ton unit if the home is out in the open.

    You need to change to a 3 speed motor. I dont think theres enough cfm going across that coil.

    mh

  10. #10
    Join Date
    Dec 2011
    Location
    somewhere between here and there
    Posts
    478
    holy crap!!!!!! 4 tons in a mobile??????
    r u for real?????

    guess its dif up here in canada.....

    dont they still use that crappy pancake duct in mobiles??? how would you get 1600 cfm thru a 16x6 duct????

    just wondering....


    Please, Please Please......keep the Factory Smoke in the Wires!!!!!


    Is it Rum'Oclock yet???

  11. #11
    Join Date
    Dec 2003
    Posts
    259
    Thats will they're high static systems. Can we say Tornado type air flow, LOL Our average temp here in summer is about 98* and 1 to 3 weeks of 110+

  12. #12
    Join Date
    Dec 2005
    Posts
    17
    Make sure all your duct work is connected below. (Crawl) ive came into numerous cases where it has been botched or animals used the flex to make a home. Since the homes are modular and ductwork is premade, thr final step is connecting both sides with large insulated flex together and the majority of times it falls off because of crap installers.

  13. #13
    Join Date
    Apr 2011
    Location
    michigan
    Posts
    170
    I dont remember the exact operating paramaters of the system but the superheat was 8-10, and subcooling was 12 or so. The home is about 12 years old I believe, I will be putting in the 3 speed blower soon and will double check the duct under the home lucky me its only 2 blocks off the ground, only other concern is by putting in the larger blower I hope I don't blow the flex off.

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