Results 1 to 10 of 10

Thread: mobile home

  1. 10-07-2005, 03:57 PM #1
    airworx
    airworx is offline Member
    Join Date
    Mar 2003
    Posts
    1,877
    Post Likes
    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.
    Reply With Quote Reply With Quote
  2. 10-07-2005, 04:06 PM #2
    MadeinUSA
    MadeinUSA is offline Banned
    Join Date
    Mar 2004
    Location
    Gone
    Posts
    5,340
    Post Likes
    Nevada should be by shortly to help you.

    He specializes in mobile/ modular/ trailer/ tandem axle/ triple axle issues.
    Reply With Quote Reply With Quote
  3. 10-07-2005, 04:07 PM #3
    dan sw fl
    dan sw fl is offline Professional Member*
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    8,206
    Post Likes

    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
    Reply With Quote Reply With Quote
  4. 10-07-2005, 11:30 PM #4
    airworx
    airworx is offline Member
    Join Date
    Mar 2003
    Posts
    1,877
    Post Likes
    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.
    Reply With Quote Reply With Quote
  5. 10-07-2005, 11:48 PM #5
    Black Adder
    Black Adder is offline Professional Member*
    Join Date
    Sep 2001
    Location
    Vancouver Canada
    Posts
    996
    Post Likes
    Sure sounds monster big for less than 2000 sq. ft. I would be inclined to check my calculations again.
    "Go big or Go Home"
    Reply With Quote Reply With Quote
  6. 10-08-2005, 12:00 AM #6
    MadeinUSA
    MadeinUSA is offline Banned
    Join Date
    Mar 2004
    Location
    Gone
    Posts
    5,340
    Post Likes
    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.
    Reply With Quote Reply With Quote
  7. 10-08-2005, 12:19 AM #7
    karsthuntr's Avatar
    karsthuntr
    karsthuntr is offline Professional Member*
    Join Date
    Mar 2004
    Location
    Grottoes VA
    Posts
    5,854
    Post Likes
    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.
    Reply With Quote Reply With Quote
  8. 10-08-2005, 04:53 AM #8
    dan sw fl
    dan sw fl is offline Professional Member*
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    8,206
    Post Likes
    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
    Reply With Quote Reply With Quote
  9. 10-09-2005, 12:36 AM #9
    lakeman1234
    lakeman1234 is offline Professional Member
    Join Date
    Mar 2005
    Posts
    661
    Post Likes
    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.
    Reply With Quote Reply With Quote
  10. 10-09-2005, 12:29 PM #10
    karsthuntr's Avatar
    karsthuntr
    karsthuntr is offline Professional Member*
    Join Date
    Mar 2004
    Location
    Grottoes VA
    Posts
    5,854
    Post Likes
    Originally posted by dan sw fl

    Who makes the high static blowers?

    Coleman, Miller, Nordyne, etc...
    Karst means cave. So, I search for caves.
    Reply With Quote Reply With Quote
« Previous Thread | Next Thread »

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Forum Rules
Contracting Business

Related Forums

Plumbing Talks | Contractor MagazineThe place where Electrical professionals meet.
HPAC Engineering