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Wiring help on nti boiler with taco controller

nathanblome
nathanblome Member Posts: 6
edited January 2023 in Thermostats and Controls
Installed a Nti ftvn199c boiler and a 4 zone plumbing setup with a taco sr506-exp switching relay and am just having trouble with the setup. 

Wired up everything per the directions and once I fired the boiler up im getting a 101 code (overheat) 

guessing ive just not got the wiring or programming sorted correctly. 


Comments

  • Ironman
    Ironman Member Posts: 7,511
    Okay, how about some pics?
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
    nathanblome
  • Ironman
    Ironman Member Posts: 7,511
    How about a close up of the Taco panel?
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • nathanblome
    nathanblome Member Posts: 6

  • Ironman
    Ironman Member Posts: 7,511
    You need the jumper between “ZR” and “ZC”.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • nathanblome
    nathanblome Member Posts: 6
    Oh man. If this works your my hero!
  • Ironman
    Ironman Member Posts: 7,511
    Why do you have a thermostatic mixing valve installed?
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • nathanblome
    nathanblome Member Posts: 6
    Nti states i have to have it. 
  • Ironman
    Ironman Member Posts: 7,511
    I have that same boiler (HTP version) in my house and we sell and install them regularly. I can find no where in the instructions that it’s required.
    Are you running two supply water temp zones?
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • nathanblome
    nathanblome Member Posts: 6
    I may have screwed up then. I was going by the sticker on the outside of the box. 


  • Tom_133
    Tom_133 Member Posts: 904
    A thermostatic valve is required on the domestic side. Not on the heating side. You just need to put your closely spaced tees. the manual will help you to pipe it correctly. If you are working with low temp in the house, that makes a bit more sense.
    Tom
    Montpelier Vt
    Ironman
  • Ironman
    Ironman Member Posts: 7,511
    Yes, that sticker is referring to domestic water heating.

    Is this a combi boiler?

    Some pics of the boiler and its piping would help.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
    nathanblome
  • hot_rod
    hot_rod Member Posts: 23,086
    I think that boiler needs to be piped primary secondary, or with a hydraulic seperator. No mix valve needed in the boiler piping.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
    Ironman
  • nathanblome
    nathanblome Member Posts: 6
    Here’s a look at the piping. I pulled the tempering setup and rethought the primary secondary setup. 

    Anyone think I could cross where I had the tempering system and make it work?


  • Ironman
    Ironman Member Posts: 7,511
    edited January 2023
    We need a pic showing all of the bottom of the boiler and the piping under it.



    The expansion tank can be in the boiler or system loop.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.

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