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Dave_22 Member Posts: 232
Hello- I had the constant recirc post yesterday that made me think of another question. If I am piping a homerun system with panel rads and need 3 rads to cover the heatloss of the living area- do I really need 3 TRV's or should I pipe these 3 rads in series with 1 TRV?


  • Weezbo
    Weezbo Member Posts: 6,232
    BTU requirements....?

  • Dave_22
    Dave_22 Member Posts: 232

    I believe it was around 12,000.
  • Weezbo
    Weezbo Member Posts: 6,232
    well, i dont have the lit in front of me , howeva there is some

    thing to the effect that there is diminishing supply and return temps on sucessive pannels down stream with individual trv's i havent used pannels on only one trv however i have built a backyard variety of a "pannel" out of embassy and slant finconvectors with three pieces stacked one above the other with only one trv...so, my answer goes like this get the lit, see if there isa pannel of 12000 btus made by that manufacturer then check the temp diff for it against the individual rads you have...first. even heating has couple things to look for....to be very honest with you i think it best to use individual trv's And mix it down with a reactive reset ahead of the entire zone or zones..and ajudicate each individual temp differential on the rads ...
  • Ted_9
    Ted_9 Member Posts: 1,718

    Dave TRVs are inexpensive. Why cut the cost. You'll have less control.


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  • Dave_22
    Dave_22 Member Posts: 232

    This is true Ted. What about if you wanted to do a nighttime setback??? Would it be good to have 1 master thermostat that is set higher than the TRV setting during the day and lower at night? That way you wouldn't have to go around and adjust them manually every night?
  • Mark Eatherton1
    Mark Eatherton1 Member Posts: 2,542
    Danfoss majkes a TRV timer

    that can be applied to any of thier TRV bodies. I'd go with the three individual trv's as well due to differing solar gain/exposures.

  • Mike T., Swampeast MO
    Mike T., Swampeast MO Member Posts: 6,928

    The "master" stat scheme works. If your boiler or reset controller allow you can also reduce the supply temperature (starve the TRVs) when you want whole-house setback.

    Multiple rads served by a single TRV can be very tough to design because it's nearly impossible to estimate delta-t across each radiator. If you must, would suggest putting the room temp sensor for the TRV in the part of the room where you expect the greatest heat loss. Multiple TRVd rads in the same space work fine. In moderate weather, you'll likely find that only one or two are providing heat for the entire room.
  • Dave_22
    Dave_22 Member Posts: 232

    Thank you-great stuff as usual.
  • Jimmy Gillies
    Jimmy Gillies Member Posts: 250

    Here in the UK we would always put 3 TRV's in, 1 on each rad.
    I have never had a problem with that.
    Hope that helps.
    Jimmy Gillies (Scotland)
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