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Thread: mobile home

  1. 10-07-2005, 03:57 PM #1
    airworx
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    have a 28' x 70' mobile home. ac and heat are missing.
    i figuered a 5 ton system with 20 kw heater.
    the supply duct is 12". i know that mobile homes will require more static but 12" duct seems small unless my 5 ton calc is overly wrong.

    fort worth, texas any help would be appriciated.
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  2. 10-07-2005, 04:06 PM #2
    MadeinUSA
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    Nevada should be by shortly to help you.

    He specializes in mobile/ modular/ trailer/ tandem axle/ triple axle issues.
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  3. 10-07-2005, 04:07 PM #3
    dan sw fl
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    Thumbs up New Design

    Originally posted by airworx
    28' x 70' mobile home. AC and heat are missing.
    ...5 ton system with 20 kw heater.

    Supply duct is 12".
    ... mobile homes will require more static but
    12" duct seems small unless my 5 ton calc is overly wrong.

    Fort Worth, Texas any help would be appriciated.
    2,000 CFM normally needs about
    2 square feet (ie. 18" x16" or one 22" diamter or two 16" diameter ) [and larger Return] Supply duct flow area before the first branch.

    I suspect that a 4-ton ( 1,600 CFM and, 16" x14" Supply duct) may be sufficient if you do Not have a lot of glass area.

    Detailed floor plan and duct work schematic (layout)
    would be need to
    address complete proper design
    which requires
    both ACCA Manual J and D calculations.
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities
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  4. 10-07-2005, 11:30 PM #4
    airworx
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    Thread Starter
    dan swfl: i am not a mobile home expert by any means but
    i ran a ht load and i came up with 4 to 5 tons. this is a used home which someone took the existing system out.
    i looked at the supply duct coming out of the bottom of the supply plenum and it is 12". now to me that will only carry about 700 cfm, so i was thinking that mobile homes have to have more static pressure and that is why the duct is so small.
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  5. 10-07-2005, 11:48 PM #5
    Black Adder
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    Sure sounds monster big for less than 2000 sq. ft. I would be inclined to check my calculations again.
    "Go big or Go Home"
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  6. 10-08-2005, 12:00 AM #6
    MadeinUSA
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    Originally posted by airworx
    so i was thinking that mobile homes have to have more static pressure and that is why the duct is so small.
    You are correct. The furnaces designed for the shacks have high staic blowers to push the required air through the sorry ducting they install in them.
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  7. 10-08-2005, 12:19 AM #7
    karsthuntr's Avatar
    karsthuntr
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    I have never seen a 5 ton unit for a trailer. I am wondering if they are even available.

    I have installed plenty of 4 ton's.
    Karst means cave. So, I search for caves.
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  8. 10-08-2005, 04:53 AM #8
    dan sw fl
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    Originally posted by madeinusa
    You are correct. The furnaces designed for mobile homes have high static blowers to push the required air through the sorry ducting they install in them.
    Who makes the high static blowers?

    Duct leakage defined:

    http://homeenergy.org/archive/hem.di...96/960110.html
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities
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  9. 10-09-2005, 12:36 AM #9
    lakeman1234
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    I agree with karsthuntr. I have put in several AC's on double wides and modular homes. They tend to use 3 to 4 ton AC's on them. Most that I have done are 4 tons with a couple of 3 tons. Single wides tend to go with 3 tons but have seen 2.5 ton's on smaller trailers.
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  10. 10-09-2005, 12:29 PM #10
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    karsthuntr
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    Originally posted by dan sw fl

    Who makes the high static blowers?

    Coleman, Miller, Nordyne, etc...
    Karst means cave. So, I search for caves.
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