Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Taco 406 with Hydrosolar air fan

carlgren
carlgren Member Posts: 9
in THE MAIN WALL

Hi,

I have a Taco ZVC406 for zone control on my radiant. I bought a Hydrosolar air fan for additional heat in a large area and was told it would function like any other zone.

All my thermostats are connected to the Taco with RW. I don't use the C.

I was told to use the NL connections for heat on the Hydrosolar.

So my thermostat connects to the taco on RW and from there I have a line that runs to the NL on the Hydrosolar. The zone valve opens as expected when there is a call for heat and water goes through the Hydrosolar but the fan isn't switching on. There is a temperature probe in the coil and the fan shouldn't come on until the coil temperature reaches 30C.

I'm wondering if the line from the Taco should be connected to RC on the Taco and NL on the hydrosolar unit.

Here's the diagram on the Hydrosolar… I was told to use the NL (heating signal 24v) on the top left with my configuration.

Hydrosolar wiring.png

Any thoughts?

Thanks

Don

Comments

  • Jamie Hall
    Jamie Hall Member Posts: 26,007

    Looks to me like L, N and G on the connections on the bottom of the unit diagram you supplied above are a live power feed— L is 120 hot, N is the neutral return, and Gnd is ground. Unhappily there are seveal other terminals on the device which appear to be marked L and N, and it is by no means certain whether those are 24 Vac or 110 Vac..

    There really isn't enough information to say what should be connected to what — and a very real risk that the wrong connection will damage either the Taco or this controller. Or both…

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • carlgren
    carlgren Member Posts: 9

    Hi Jamie,

    Yes the ones at the bottom are the power in…120V. They are marked as such. On the board they are on a screw terminal block.

    It's the ones across the top that are the low voltage ones. the heating and cooling ones are marked as 24vac. Beside those is the connections if you use their 'custom' thermostat control that also gives fan speed control. The N and L on it are also 24vac.

    I've been trying to find a schematic as that may help the experts on here figure out what I need to do but I haven't been able to find anything but the board layout.

    Don

  • carlgren
    carlgren Member Posts: 9

    In the troubleshooting guide it says if the fan doesn't start then

    Check the position of the Summer/Winter button (if present) and the temperature
    set-point. Confirm 24 VAC power at PCB and at thermostat. If no 24 VAC, check
    transformer and replace if failed.

    there is no summer/winter button. I'm not sure if this means that the 24VAC is from the thermostat? If so I could provide it from the RC on the taco.

    I'll be calling Hydrosolar tomorrow. They have ignored emails since they shipped the unit.


    Don

  • Joe Mattiello
    Joe Mattiello Member Posts: 740

    this looks like a good application for using zone 6 for hydrosolar unit and no/com terminal that work with zone six the your LN terminal which is 120 volt ready.

    Before doing any wiring, please call Taco tech support at 401-942-8000 for further assistance.

    Joe Mattiello
    N. E. Regional Manger, Commercial Products
    Taco Comfort Solutions
  • hot_rod
    hot_rod Member Posts: 25,094

    Looks like you might need to use their thermostat if you want the multi speed functions. Then NL goes to the zone controller, which wires to the ZV and the end switch calls the boiler.

    The unit should have the thermal switch to turn on the fan when it hits 86F. Which seems a bit low? I think kickspace heaters use a 120F thermal switch. Try it and see.

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • carlgren
    carlgren Member Posts: 9

    Hi Joe,

    Thanks. I'll give taco a call tomorrow. I have it on zone 6 now. The water part is working fine, I think the issue is that the fan coil doesn't know I'm pumping water through it because I'm not giving it what it needs on the NL connection.

    These units are designed to run at a lower temp than a kickspace heater. The boiler heats to about 135 on the radiant side depending on the outside air temperature. According to the documents that came with the fan coil the thermal switch turns on the fan at 30C and I know it was hotter than that when I was testing. Multispeed doesn't matter in our application since it will only be used to warm a large space up a little quicker if we find we need more than the radiant in the floor is doing.

    Don

  • carlgren
    carlgren Member Posts: 9

    Called Hydrosolar first and talked to their tech. Issue solved in 2 minutes. Salesman was totally wrong. From the Taco I needed to connect to their thermostat connection on R and V1 then put a jumper from V1 to whichever fan speed I wanted and "volia" works exactly the way I wanted it to. And does it ever pump out the heat. And even better, it's whisper quiet.


    Thanks to those who chipped in with ideas.

Categories