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New Laars FT Series Combi Boiler only has zc location terminal shared with system pump L.

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TCTOPPS
TCTOPPS Member Posts: 53
in Thermostats and Controls
New Laars FT Series Combi Tankless Boiler and it only has zc location terminal shared with the system pump Line terminal location. I am trying to activate a Taco SR503-4. I have removed the jumper from the board at zc and zr and ran a line from zc on the relay to zc on the boiler. I have removed the system pump hotline. Just thought I need to reconnect but am not sure. There is no zr location as a terminal location. What to do? Thanks

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  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 4,623
    Are you trying to get the boiler to turn on when there's a call for heat? If so, the end switch on the Taco should be wired to terminals 3 and 11 on terminal block CN11.


    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
    Mad Dog_2

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