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  1. #1
    Join Date
    Jan 2010
    Posts
    79

    Radiant job in progress

    Walked in to this one, I will be responsible for finishing the piping and wiring everything. Not a bad start to this oneName:  uploadfromtaptalk1393372639579.jpg
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  2. #2
    Join Date
    Sep 2002
    Posts
    3,708
    You must be using more then a 20 degree temp drop with that small pipe?

  3. #3
    Join Date
    Jan 2010
    Posts
    79
    I'm not a big hydronics guy, I'd have to check the plans, but the system was designed by our distributor and it is built to their specs, they do the loads and design the system for free if we buy everything from them

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  4. #4
    Join Date
    Oct 2009
    Location
    God's country - Shenandoah Valley, VA
    Posts
    342
    I think you may be slightly over-pumped.
    Bob Boan


    ​You can choose to do what you want, but you cannot choose the consequences.

  5. #5
    Join Date
    Jan 2010
    Posts
    79
    That's how they designed it, like I said, I'm just doing some piping and wiring everything

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  6. #6
    Join Date
    Jan 2012
    Location
    British Columbia
    Posts
    76
    Thats ok , all those DPBP valves will help , this looks really expensive!How many loops on each pump circuit?
    If at first you don't succeed , get mad , get busy, get even!

  7. #7
    Join Date
    Jan 2010
    Posts
    79
    Just 1 each

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  8. #8
    Join Date
    Oct 2009
    Location
    God's country - Shenandoah Valley, VA
    Posts
    342
    I think that distributor designed it primarily for how many components he could sell.

    A little hydronic math:
    A 1/2" pipe will carry 1.5 gpm
    A 3/4" pipe wil carry 4 gpm
    A 1" pipe will carry 8 gpm
    A 1 1/4" pipe will carry 14 gpm
    A 1 1/2" pipe will carry 22 gpm
    A 2" pipe will carry 38 gpm

    All of these are at a velocity of 4 feet per second which is the maximum for normal design.

    Do the math: there are 7 circ's with 3/4" lines connected to a 1" header and one that's 1" which I assume may be for an indirect. If all seven circ's tried to move 4 gpm at the same time, that would be 28 gpm through a header that could only carry 8 gpm. The system's over-pumped or the headers way under-sized.

    A second question: are all seven loops designed to run at different temps? If not, then why do you need seven mixing valves?

    This system could save a lot of energy, and maybe cost, if it was designed with manifolds with actuators or even simple zone valves plus one or two ECM circ's.

    The workmanship looks great, but your suppliers design doesn't.
    Bob Boan


    ​You can choose to do what you want, but you cannot choose the consequences.

  9. #9
    Join Date
    Jan 2010
    Posts
    79
    It's a 1 1/4 header, though that still doesn't add up, the loop temps are different, a couple of them are the same, I think there's 5 different temps all told, and yes that eighth pump it's for an indirect water heater. I found it a little strange that it was so many pumps, my old company would have used zone valves, but then again they had an in house guy that designed everything. I'd hate to admit it, but the company I currently work for is full of hacks, does mostly new construction, and uses subs a lot, which I've never approved of. I was hired as the service manager, except they have almost no service other than warranty work. Mostly I'm out doing mechanical work on all of their projects, they only let the subs do the ductwork.

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  10. #10
    Join Date
    Jan 2010
    Posts
    79
    Not to mention I have to change some of the piping that's there. 8" to the right of the water heater loop is the air scoop, need to move it to 18", and this ties in to two wall hung Dunkirk boilers with built in boiler pumps, he didn't install the flow controls, ugh

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  11. #11
    Join Date
    Oct 2009
    Location
    God's country - Shenandoah Valley, VA
    Posts
    342
    I can't see why you would need five different temps unless there are five different types of emitters.

    Do you know the heat loss of the house and the output of the boilers?
    Bob Boan


    ​You can choose to do what you want, but you cannot choose the consequences.

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