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Wiring/controls help

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dogpound247
dogpound247 Member Posts: 3
in THE MAIN WALL
Need help with this injection system tekmar356 injection control taco zvc 404 zone valve control box 3 pump system boiler pump injection pump and system pump, a quick wiring diagram would save me, thanks!

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  • 109A_5
    109A_5 Member Posts: 1,385
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    tekmar356
    https://www.watts.com/products/hvac-hot-water-solutions/controls/boiler-mixing-controls/356/356
    scroll down to Installation and Operation - 356 (Sep 2008 - Present)
    https://www.watts.com/dfsmedia/0533dbba17714b1ab581ab07a4cbb521/42849-source/356-d-06

    taco zvc 404 zone valve control box
    https://www.tacocomfort.com/documents/FileLibrary/102-399.pdf

    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
  • hot_rod
    hot_rod Member Posts: 22,142
    edited November 2022
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    This throws some installers off. You need a transformer to power the control,then two wires to the zone control to signal it on with any heat call
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 7,835
    edited November 2022
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    Here is the total package

    1. Taco ZVC gets a call from a zone.
    2. Zone valve opens. Zone valve end switch signals ZVC to call for heat mode
    3. ZVC end switch at bottom X X (or C and NO) activates P3 system pump
    4. ZVC end switch at top X X sends signal for a call for heat to the 356 at D1 in the 356 diagram.
    5. 356 operates the injection pump P2
    6. 356 signals boiler to operate
    7. Boiler controls operate P1

    Edward F Young. Retired HVAC ContractorSpecialized in Residential Oil Burner and Hydronics
  • dogpound247
    dogpound247 Member Posts: 3
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    You guys are awesome thanks for the help!!
  • hot_rod
    hot_rod Member Posts: 22,142
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    EdTheHeaterMan said:

    Here is the total package

    1. Taco ZVC gets a call from a zone.
    2. Zone valve opens. Zone valve end switch signals ZVC to call for heat mode
    3. ZVC end switch at bottom X X (or C and NO) activates P3 system pump
    4. ZVC end switch at top X X sends signal for a call for heat to the 356 at D1 in the 356 diagram.
    5. 356 operates the injection pump P2
    6. 356 signals boiler to operate
    7. Boiler controls operate P1

    Could the 24v come from the relay box instead of another separate transformer? Shouldn’t take much to power the tekmar?

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 7,835
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    hot_rod said:


    Could the 24v come from the relay box instead of another separate transformer? Shouldn’t take much to power the tekmar?

    You may be correct. LCD for the front, Relay for the boiler and a potentiometer for the injection pump. I guess it depends on the quantity and type of zone valve and the size of the transformer in the Taco
    Edward F Young. Retired HVAC ContractorSpecialized in Residential Oil Burner and Hydronics

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