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Thread: RTU replacement

  1. #1
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    RTU replacement

    3 story townhomes with basement. (not sure on square footage yet)

    Currently, the townhomes have a packaged Trane RTU (model # YCC036A1L0B) with gas heating and electric cooling. The heating capacity says 62,000/76,000 and cooling is 36,6000.

    They have some issue with heating 1) The heat doesn't get down to the 1st floor very well. 2) The 3rd floor bedrooms get loud from unit operation.

    These units need to be replaced and the owner is thinking to either put new RTU's or change to a split system. Any thoughts, suggestions, recommendations?

    I appreciate it

  2. #2
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    First it sounds like a ductwork issue. Ductwork should be checked, all rooms balanced to provide proper air flow to each room. You will be looking at a significant installation cost to switch to a split system for ductwork renovations. Gas, electrical will have to be moved, refrigerant lines will have to be run. If the furnace is installed in the basement then you will most likely have the opposite issue if the ductwork is not addressed, top floor will be hot in the summer.

    My recommendation is to find a trustworthy contractor and have them inspect ductwork and check airflow. After you do this you can see if the unit needs to be replaced.

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  4. #3
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    Poor distribution is not the fault of the equipment. As already mentioned, look into duct renovations.
    AOP Rules: Rules For Equipment Owners.

    Free online load calculator: http://www.loadcalc.net/


    There = not here. Their = possessive pronoun. They're = they are
    It's = contraction of it is. Its = the possessive form of it
    Too = also. To = expressing motion. Two = 2
    Then = after that, next. Than = indicates a comparison.
    Questions should end with a question mark "?" Statements end with a period "."

  5. #4
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    Walk away, the homeowner is going to put the cheapest thing on they can find and will ignore the ducting which I'm guessing will be inaccessible. As stated, your ducting is what keeps you comfy, so replacing the system, or even worse, increasing the capacity of the system, wont keep you comfy, you'll just inherit someone else's problem. I'd recommend minisplits for each floor, that's about the only way you'll have even temps from floor to floor. What floors are the tstat and return on?

  6. #5
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    Quote Originally Posted by Makeitcold View Post
    Walk away, the homeowner is going to put the cheapest thing on they can find and will ignore the ducting which I'm guessing will be inaccessible. As stated, your ducting is what keeps you comfy, so replacing the system, or even worse, increasing the capacity of the system, wont keep you comfy, you'll just inherit someone else's problem. I'd recommend minisplits for each floor, that's about the only way you'll have even temps from floor to floor. What floors are the tstat and return on?
    The OP is a HVAC Engineer!

  7. #6
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    Quote Originally Posted by pecmsg View Post
    The OP is a HVAC Engineer!
    Cant be! Engineers start all sentences with "I'm an engineer....."

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  9. #7
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    Quote Originally Posted by Makeitcold View Post
    Cant be! Engineers start all sentences with "I'm an engineer....."

  10. #8
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    Quote Originally Posted by Makeitcold View Post
    Cant be! Engineers start all sentences with "I'm an engineer....."
    OP is a HOA president. Or works for a home warranty company.

  11. #9
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    Quote Originally Posted by Pnasty View Post
    OP is a HOA president. Or works for a home warranty company.
    Didn’t think you could get lower then Engineer.

    I was Wrong!

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  13. #10
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    Quote Originally Posted by pecmsg View Post
    Didn’t think you could get lower then Engineer.

    I was Wrong!
    You need to at least have some sort of certificate to say you are an engineer. The other to require only a pulse.

  14. #11
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    Quote Originally Posted by pecmsg View Post
    The OP is a HVAC Engineer!
    _ Fraudulent at best based on current discussions.

    ___ KNOWS Nothing or next to nothing about Design Process
    __ nor ACCA or ASHRAE type analysis to address a specific situation.

    One must at least be able to frame a discussion and
    Directly state the problem.

    https://www.bing.com/search?q=fraud+...ba25fedabdefad
    Last edited by dan sw fl; 09-29-2020 at 09:09 AM.
    Designer Dan __ It's Not Rocket Science, But It is SCIENCE with Some Art. _ _ KEEP IT SIMPLE & SINCERE ___ __ www.mysimplifiedhvac.com ___ __ Define the Building Envelope & Perform a Detailed Load Calc: It's ALL About Windows & Make-up Air Requirements. Know Your Equipment Capabilities

  15. #12
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    Thread Starter
    I am an electrical engineer that wasted my time with electrical and now trying to learn what really matters, HVAC!

    I appreciate all the help from this forum significantly.

  16. #13
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    So is this a house you are managing or looking to buy?

  17. #14
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    Thread Starter
    Neither. I went from senior electrical engineer to entry level HVAC designer. This is a project that I've been given to work on so learning.

  18. #15
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    Quote Originally Posted by S_Kelly View Post
    Neither. I went from senior electrical engineer to entry level HVAC designer.
    This is a project that I've been given to work on so learning.
    School-of -Hard-Knocks:
    ________________ How NOT to do it may be your initial work effort.

    First assignment:
    _______ Read the entire HVAC SYSTEMS DESIGN HANDBOOK by HAINES and report back.

    https://www.amazon.com/HVAC-Systems-.../dp/0071622977
    Handbook - Chapter 4
    State Building Code -Section EC, Chapter 4

    ________________
    Start Point:
    ____ 1. AHU or RTU location
    ____ 2. Manual J Room-by-Room Calc
    ____ 3. Establish Vertical shafts for Supply & Return Air
    Designer Dan __ It's Not Rocket Science, But It is SCIENCE with Some Art. _ _ KEEP IT SIMPLE & SINCERE ___ __ www.mysimplifiedhvac.com ___ __ Define the Building Envelope & Perform a Detailed Load Calc: It's ALL About Windows & Make-up Air Requirements. Know Your Equipment Capabilities

  19. #16
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    Electric lives matter too


    Sent from my iPhone using Tapatalk

  20. #17
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    Well then. 1 system per floor is the best method to have consistent comfort, floor to floor. Zoning can work but it has limits, and any multi-story building will have issues with pushing hot air down or cold air up, then factor in tstat and return locations. Can it be done well? Sure. Is the builder going to give you the proper space to run ducting PROPERLY? Doubt it.

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