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fwmech
fwmech Member Posts: 8
in Gas Heating

Hello all,

I am new to the mod con, combi world. I moved from an area that had fuel oil only so this is my first go at installing these new units.

I have a before and after picture here of a Navien that I replaced with a Lochinvar.

I'm looking for feedback on if I accomplished the goal of primary secondary. The Lochinvar has an internal system pump so the boiler loop is the primary.

I got the idea for the "moose antler" installation from either a Taco after dark or coffee with Caleffi webinar where it was suggested.

I made the primary and manifold piping 1-1/4" because the boiler is 199,000 BTU.

I have more of these installs lined up so please let me know what I can do better. Thanks!

1000006607.jpg 1000006577.jpg

Comments

  • mattmia2
    mattmia2 Member Posts: 14,239

    Why would the water flow out through the system instead of through that bypass?

  • neilc
    neilc Member Posts: 3,055

    I think your neutralizer is upside down, the outlet wants to be high to hold back a reservoir there, for more neutralization time,

    known to beat dead horses
  • Kaos
    Kaos Member Posts: 734

    Very clean install, easy to service. I find manifolds add a lot of value and save significant install time. If you need more flow than the typical ones, Watts has high flow series that will do 4GPM per port.

    Besides the correct hydraulic circuit, the other important bit is the setup and configuration. Is the outdoor sensor installed? A reasonable reset curve to match emitters? Space heat limit set to a reasonable value above expected space heat load? These bits are just as important as it will effect the actual efficiency of the unit and how much it will cycle. Short cycling is the silent killer of modcons. Also a bit of education of the home owner to understand that with outdoor reset recovery will be slower so they have to change the programming on their thermostat.

    One small improvement with any combi or tankless unit. A small 5 gallon plug in tank with 3/4" ports on the outlet of the unit will eliminate any wait time without having to keep the boiler running by enabling combi pre-heat.

  • hot_rod
    hot_rod Member Posts: 25,703

    I have that boiler, I think the boost function over rides the ODR, so recovery should be adequate

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • fwmech
    fwmech Member Posts: 8
    https://forum.heatinghelp.com/discussion/comment/1866812#Comment_1866812

    Thank you! I'll fix that tomorrow

  • fwmech
    fwmech Member Posts: 8
    https://forum.heatinghelp.com/discussion/comment/1866839#Comment_1866839

    I am working on learning the right way to set the inputs. So far using Lochinvar U videos. There are three zones of baseboards and I have a 140° target system temp running right now. I am not happy with the ∆T, it's only 5-10° lower on the return temp. The Taco 0015e3 is set on medium speed, I'm thinking about going to the low speed. I don't suppose anyone uses a circuit setter residentially, right? I'm a former commercial and industrial and I'm learning what's common and available residentially as I go. Thanks for the help!

    The outdoor reset is installed, on the North wall of the home.

  • Intplm.
    Intplm. Member Posts: 2,730

    When installing these, one thing to do is allow as much room as possible for serviceability. All too often these things get crammed into tight spaces.

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