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  1. #27
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    27,224
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    How long have you been doing HVAC work?

  2. #28
    Join Date
    Aug 2019
    Location
    Maryland
    Posts
    22
    Post Likes
    Thread Starter
    Quote Originally Posted by pecmsg View Post
    How long have you been doing HVAC work?
    2 years.


    Sent from my iPhone using Tapatalk

  3. #29
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    27,224
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    I appreciate the honesty.

    I replaced a similer system in a summer house. Went from 2) 7 & 1) 12 to a 12K Ducted. Problem solved.

    This system is seriously oversized and doomed for premature failure

    Is there a senior tech that can help with sizing and layout?

  4. #30
    Join Date
    Aug 2019
    Location
    Maryland
    Posts
    22
    Post Likes
    Thread Starter
    Quote Originally Posted by pecmsg View Post
    I appreciate the honesty.

    I replaced a similer system in a summer house. Went from 2) 7 & 1) 12 to a 12K Ducted. Problem solved.

    This system is seriously oversized and doomed for premature failure

    Is there a senior tech that can help with sizing and layout?
    Yes. Ill be consulting with guys that have mentored me and wont move without their approval. I just wanted to do some of the footwork, as it helps me to learn. Thanks as well for the honesty. Thats why I come here


    Sent from my iPhone using Tapatalk

  5. #31
    Join Date
    Jan 2010
    Posts
    19,279
    Post Likes
    We have members here who can work the numbers.
    You'll just have to give them more information.

  6. Likes Sabr7 liked this post.
  7. #32
    Join Date
    May 2011
    Location
    romulus, mi
    Posts
    379
    Post Likes
    Quote Originally Posted by Sabr7 View Post
    Im not the best at math but I know 9 + 9 + 24 = 42.

    Im tagging along for an install of a multi zone mini split. Two bedrooms having 9k BTU head each and an open space having 24k (and Im fairly new to the trade) but I just want to understand this... why is the condenser at a rating of 36k BTU...?

    Also, after doing the BTU calculations it says we will need 21,600 BTU for the open space. Thats how we got at the 24k number.. is it generally better to scale up or down in choosing the tonnage?


    Sent from my iPhone using Tapatalk
    most multi-head mini splits are installed on the assumption that all heads will not be running at capacity at all times you have to look at the literature for the brand they're selling to see if that condenser matched those 3 heads
    RTB Mechanical
    734-315-0064
    http://rtbmechanical.com

  8. #33
    Join Date
    Sep 2005
    Location
    Atlanta GA area
    Posts
    44,189
    Post Likes
    Quote Originally Posted by dkalasz View Post
    most multi-head mini splits are installed on the assumption that all heads will not be running at capacity at all times you have to look at the literature for the brand they're selling to see if that condenser matched those 3 heads
    YUP...

    And if someone has done lots of conventional split system zoning...
    They know that it is very rare, for the system to be running at full capacity.

    There is more to this... than the math...
    GA-HVAC-Tech

    Your comfort, Your way, Everyday!

    GA's basic rules of home heating and AC upgrades:
    *Installation is more important than the brand of equipment
    *The duct system keeps the house comfortable; the equipment only heats and cools (and dehumidifies)
    *Cheap is not good, good is not cheap; however expensive is not a guarantee of quality!
    Choose your contractor wisely!

  9. Likes icy78 liked this post.
  10. #34
    Join Date
    Dec 2006
    Location
    Vancouver, B.C.
    Posts
    881
    Post Likes
    Some manufacturers allow you to over size the total indoor unit rated capacity above the outdoor units rated capacity by a certain percentage. You need to read the product literature to know how much allowance you have if any is allowed at all.


    Sent from my iPhone using Tapatalk
    Quickly, I must hurry, for there go my people and I am their leader!

  11. #35
    Join Date
    Oct 2011
    Location
    Culver, Oregon (Central OR)
    Posts
    2,671
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    Quote Originally Posted by thatguy View Post
    Some manufacturers allow you to over size the total indoor unit rated capacity above the outdoor units rated capacity by a certain percentage. You need to read the product literature to know how much allowance you have if any is allowed at all.


    Sent from my iPhone using Tapatalk
    Most combinations you can "apply" 150% of the OD unit capacity.

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