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wiring hydrolevel 3250+ and taco zvc404

jeff121jeff121 Member Posts: 13
hey guys. reading the instructions for the hydrostat 3250+ and the zvc404, there seems to be some differences in the way they suggest wiring the 2 together. If you wouldnt mind looking at the attached photo and tell me if im correct or not? im running a single circ pump with 4 zone valves with NO hot water heating system.
thank you! DIAGRAM 1_zpsyjxnezu0.jpg


  • STEVEusaPASTEVEusaPA Member Posts: 4,350
    Cant see the photo, can you just upload it here?
    Circulator is wired off of the 3250 C1, C2
    Zone panel is wired from the main end switch T-T to the 3250, T-T
  • jeff121jeff121 Member Posts: 13
    sorry, didnt see that option in the orig post:

  • lchmblchmb Member Posts: 2,992
    that could also run the circulator off the 3250 which will give you low temp control
  • jeff121jeff121 Member Posts: 13
    excuse my noob'ness but wont the 3250 shut everything down in a high temp or low water situation? or youre saying that in a low water condition the circ pump will continue to run as long as the thermostats call for heat. if connected to the 3250 it will shut th pump off as well. right?
  • STEVEusaPASTEVEusaPA Member Posts: 4,350
    Yes the circulator will run as long as there is a call for heat the way you wired it.
    You should wire the circulator off of C1 C2 on the aquastat like I stated in my first post. Otherwise you lose thermal pre-purge and circulator hold off options too.
  • jeff121jeff121 Member Posts: 13
    ok great. thanks!!!
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