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Thread: Daikin VRV

  1. #1
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    Daikin VRV

    Has Anyone Done An Install Of A Daikin VRV System? What Was Your Opinion Of The System Compared To A Standard Split System?

  2. #2
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    Can't even be compared to a split system. There are a lot of rules you have to follow that are NOT standard refrigeration practices. You have takea day long installation/commissioning class to install them. The systems we have at work have been pretty good to us. Everything is very quiet and more efficient. Are you after something specific that we might be able to answer for you?

  3. #3
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    Quote Originally Posted by ChaseW View Post
    Has Anyone Done An Install Of A Daikin VRV System? What Was Your Opinion Of The System Compared To A Standard Split System?

    They seem to work OK No major issues, but each job comes with it own hic-ups.

    The main thing is follow the installation instructions and KNOW warranty...If you have someone else doing this. KNOW the installation instructions and KNOW warranty.

  4. #4
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    Aug 2011
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    Salem Oregon
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    I've installed a half dozen VRV systems from a few manufacturers. I did a Daikin last fall. It was the second system that I know of installed for that city government. The customers decided to go with Daikin again because they had gone through all the work of figuring out the bacnet interface on their first system and didn't want to go through it again with a different manufacturer.


    Three pipes instead of two from the outdoor unit. Y-branchs to the BS (does the job of a reversing valve) controllers for each evaporator. Had to verify the sizing of the Y-branches and pipes at each point in the system. It's a bit confusing until you get your mind wrapped around it.

    Like they said above, read and understand the installation instructions and leave your assumptions behind because you'll be learning a new kind of system.

    I really enjoyed the whole thing.

  5. #5
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    Ryan, No Specific Questions, I Have Just Finished Installing My First One And Thought It Was Very Neat Technology. Couldn't Really Find Anything About It Online, So I Figured I Would Ask. I Think It Would Be Neat For A House, But Expensive, And I Am Not Sure You Can Get Them That Small.

    Dlove, I Thought So As Well, That's Why I Called Daikin For Any Questions, Although The Entire Job Was Drawn Up By An Engineer, So There Wasn't A Whole Lot Of Questions.

    Eric S, I Did Not Get A Chance To Do The Heat Recovery On This Project, But I Think It Is A Very Good Idea. The Most Challenging Part For Me Was The Metric Sizes And The Lack Of Instructions In English. I Also Liked The Refnets, It Seems Like A Better Way To Split of Branches Than Tees.

  6. #6
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    I Have A Second One To Finish In Two Weeks.

  7. #7
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    The Daikin systems use three copper pipes running from the distribution box to the fan coils whereas Mitsubishi requires only two copper pipes ran between the fan coils and the distribution box. So the Mitsubishi would be easier to install. I prefer the Mitsubishi VRF myself. Thank you very much
    "I could have ended the war in a month. I could have made North Vietnam look like a mud puddle."
    "I have little interest in streamlining government or in making it more efficient, for I mean to reduce its size. I do not undertake to promote welfare, for I propose to extend freedom. My aim is not to pass laws, but to repeal them. It is not to inaugurate new programs, but to cancel old ones that do violence to the Constitution."
    Barry Goldwater

  8. #8
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    Glennac, From What I Understand The Purpose Of The Three Pipes Is To Allow The Diffrent Indoor Units To Have One Heat And Another One Cool Simultaneously, While Being On The Same Outdoor Unit. Can Mitsubishi Acomplish That With Just Two Pipes? If So Then I Completly Agree.

  9. #9
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    Quote Originally Posted by glennac View Post
    The Daikin systems use three copper pipes running from the distribution box to the fan coils whereas Mitsubishi requires only two copper pipes ran between the fan coils and the distribution box. So the Mitsubishi would be easier to install. I prefer the Mitsubishi VRF myself. Thank you very much
    Not Really!
    Daikin uses three pipes from the Outdoor Unit to the Branch Box and two pipes from there to each fan coils. We have installed both brands without any problems.
    I'm good at making things cold...You can ask my first two wives!

  10. #10
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    Quote Originally Posted by ChaseW View Post
    Glennac, From What I Understand The Purpose Of The Three Pipes Is To Allow The Diffrent Indoor Units To Have One Heat And Another One Cool Simultaneously, While Being On The Same Outdoor Unit. Can Mitsubishi Acomplish That With Just Two Pipes? If So Then I Completly Agree.
    Both brands do this they just go about it in different manners.
    I'm good at making things cold...You can ask my first two wives!

  11. #11
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    It should also be said that one brand has every available piece of information listed on a website as the other acts as if thier info is top secret.

  12. #12
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    Quote Originally Posted by tech45 View Post
    It should also be said that one brand has every available piece of information listed on a website as the other acts as if thier info is top secret.
    Now ....that ....is a very acurate statement!!!!
    I'm good at making things cold...You can ask my first two wives!

  13. #13
    Join Date
    Aug 2004
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    North Richland Hills, Texas
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    The most aggravating installation error I run into, with pretty much EVERY VRV system I service that was installed by someone else, is the control wiring.
    For some reason the installation contractors keep using shielded wire, even though it is specifically forbidden in the installation instructions, and drilled in over and over again at the installation class.
    On top of that, they don't bother to ground the shield, so it acts as an antenna for every stray RF signal in the building, causing random communication errors.

    Installers also ignore the instructions about where the communications wires are to enter the units, and how they are to rout through the unit.
    If you run the communications line in with the line voltage wires, then zip tie it to the inverter driven compressors leads on its way to the control board, you WILL have random communications errors.

    Quote Originally Posted by ChaseW View Post
    I Think It Would Be Neat For A House, But Expensive, And I Am Not Sure You Can Get Them That Small.
    Daikin and others have models that are targeted more at residential installations.
    The Daikin VRVIII-S comes in 3 and 4 ton sizes, and can have 6 indoor units for the 3 ton, or 8 for the 4 ton.
    They are rather expensive, but are great for some applications that would be extremely difficult with conventional equipment.
    We put one in a lake house that was built in the 1960's post modern style.
    Glass walls, flat roof, limited roof truss space, and couldn't use the crawl space due to potential flooding.
    We were able to squeeze in ceiling concealed air handlers above closets.
    The job cost them 3 arms and 2 legs though...
    If more government is the answer, then it's a really stupid question.

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