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Timco Member Posts: 3,040
Cust says one boiler was replaced in January by an experienced guy. I can just see him thinking " If they sent me with a new pump...it MUST go somewhere...THINK, damn it, THINK...Where to put this..."

Could these 2 boilers feed the same P/S loop to make the best of this? Each feeds 2 units of a 4-plex. Am thinking both feeding the same P/S loop with correct circs on the zones, and adding a diaphram ex tank. Each unit could have a thermic valve & bypass for protection?

140K but total from boilers, and building has about 125K btu heatloss by rough figures.

Just a guy running some pipes.


  • Mark Hunt
    Mark Hunt Member Posts: 4,909

    is a CO death waiting to happen.

    Best deal in town no doubt.

    Mark H

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  • Hvacman
    Hvacman Member Posts: 159

    Wow, geeze... where to start on this one... is that auto feeder hanging by PEX?
  • don_192
    don_192 Member Posts: 45
    Thats was

    Thats was no boiler guy on that job.You know how I know??

    It the silver tape, only duct guys use silver tape.
  • Lots of those Laars,

    hooked-up like that around here Tim, especially on large water content systems,,the gas company did them so the people think it`s OK,,,usually the ex. tank is as big as your fist! At least you get to listen to the radio while your re-piping it!
    I do carry a roll of silver tape in my truck, but I don`t do ductwork,,,just wish I could figure-out an easy way to peel the backer-off!


  • I had one come at me a while back, the GC had let his carpenter put in the boiler at the new house. I had refused to cause the guy took too long to pay on the last one, so the future homeowner calls me up and asks if I will sign off on it so they could get their CO. I'm a softie, so I went out there to look. Looked just as though a carpenter had put it in. What a soup sandwich. I refused, she cried, I told her it would be just like her signing her name to someone elses failing test and turning it in as her own and asked her if she would like doing that. Sad but true story. I offered to redo it and THEN I would sign but she wasn't going for that, at that point it became not my problem.
  • joel_19
    joel_19 Member Posts: 931

    i am a duct guy and have silver tape I resemble that remark. Want to see all my pictures of air conditioners and boilers put in by PLUMBERS.... nah that many photos won't fit on your computer.

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  • Ed_26
    Ed_26 Member Posts: 284

    Awww.. Tim - how come you get all the good ones? Where was the inspector on this one????
  • Timco
    Timco Member Posts: 3,040

    Anyone see a problem with a copper fin boiler and a CI boiler on the same loop or should I stick with 1 boiler for 2 units?

    Just a guy running some pipes.
  • Dave Stroman
    Dave Stroman Member Posts: 765

    You can make these 2 boilers work together is they were piped and controled properly. I have seen copper boilers distroyed with piping like this. Hope there is a working flame roll-out switch in it. They might need it.

    Dave in Denver
    Dave Stroman
  • Weezbo
    Weezbo Member Posts: 6,232
    i'm thinkin the dude best pick up a less lethal hobby.

    ..for reals. *~/:)
  • hot_rod
    hot_rod Member Posts: 22,103
    P/S them together, but

    use a boiler control like the two stage tekmar to operate them. This will provide a simple method to stage, exercise, and control dual boilers. Most importantly it can be configured with return protection to assure the boilers see proper return temperatures.

    Copper tube boilers really need P/S piping, IMO, to assure adequate flow thru their HX. It may require a higher head circ then the cast boiler so proper P/S piping is critical.

    Are they both on one gas meter?

    hot rod
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Timco
    Timco Member Posts: 3,040

    Yes, one meter. I am considering a thermic valve for the laars, and not for the peerless, and parallel piping the boilers to a header with each boiler having it's own circ to the header, and primary / secondary circs for the P/S loops. Would the boiler only need a circ to the header if I am using a thermic valve & bypass? I would think the laars wants / needs the protection of the TV and it's own loop.

    Just a guy running some pipes.
  • Timco
    Timco Member Posts: 3,040

    How about this one??
    Just a guy running some pipes.
  • Chris_82
    Chris_82 Member Posts: 321
    The bypass loop is missing,...

    Thats what is going to kill this, ever read the mini therm manual...it says the bypass piping about 50 times, tape ok can anyone see the sheet metal screwws under the tape?
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