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Delta T Circulator- Boiler Loop

ChipDryden
ChipDryden Member Posts: 19
in THE MAIN WALL

I've been reading some literature regarding the taco VT2218 and am curious as to your opinions of replacing my 3 speed "boiler side" circulator w/CST's, on a Primary/ Secondary (with baseboards) system, Lochinvoir NKB 150 Noble. The Knight has a 0-10v reference to control the circulator however the Noble does not. Could the Delta T circulator provide better efficiency? Or, fight with the boilers internal adjustments??????

Comments

  • hot_rod
    hot_rod Member Posts: 25,764

    the Lochinvar Knights all come with an ECM circ that is controlled by the Smart System control. So it modulates with the firing rate of the boiler. Piped as P/S.
    I wish they would show a hydro sep stead of just mentioning it 😙

    The selling feature is reduced energy consumption from both the ECM technology and the reduced speed. Changing to a fixed speed ECM boiler pump( the green block on the graph) gets you a 50% or more efficiency gain. That is power consumption on the pump, not boiler efficiency increase. If you tracked pump run time and applied your kWh costs, you could determine the $$ saved. If you get an ECM rebate from your power company, it may pencil out to change that circ?

    We are close to the day when boilers will ship with ECM. Unless the DOE changes its mind. Again,

    IMG_1240.png IMG_1241.png
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • ChipDryden
    ChipDryden Member Posts: 19

    Thanks Hot-Rod, Exactly what I found. What I was pondering is putting a ECM Delta T circ. instead of the UPS 26-99 .Lochinvoir doesn't mention a Delta T circulator as an option in the install manual and I am still in warranty. Looks like an easy swap, but as a homeowner I don't want to screw the boiler.

  • hot_rod
    hot_rod Member Posts: 25,764
    https://forum.heatinghelp.com/discussion/comment/1867584#Comment_1867584

    You can swap it out for an ECM style to save some power, but I don't think the Nobel has the output to operate it in a specific mode.

    The pump you are considering. does it match the 26-99 for performance?

    Is that the goal to reduce electrical consumption? Is the system comfortable?

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream

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