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taco zvc405-3 zone control

replacing wirsbo a3080404 zone control  panel has 4 wire zone valve conn.

has 3 wire thermostat connector  with 4 wire thermostats

tried taco zvc-405-3 but thermostat conn. only have 2 wire conn.

and 4wire zone valve conn is there a taco box or another box that will work


  • Dave H_2
    Dave H_2 Member Posts: 556
    ZVC thermostat terminals

    You probably have the Wirsbo 4-wire thermostats like the 501. Two of the wires are for 24volt power and two are for the endswitch.

    In order to make this work on the ZVC controller, there should be a terminal on the top left of the ZVC board labeled 24 volt and common. Use this terminal to power up all of the thermostats, and the endswitch wires will go to the corresponding stat location.


    Dave H.
    Dave H
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