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Taco ZVC404 and R8285A

shamu1023shamu1023 Member Posts: 8
I have a weil mclain cg5 boiler. Older style, with Honeywell R8285A controls.  I have 3 zone valves, but original owner never had a zone controller... just manually left all zones open. One circulator.  Two Tstats.

So to add the Taco, using attached diagram for reference, I believe I just:

1) move tstats to tstat side of taco.
2) connect zone valves to corresponding zone side of taco.
3) connect from R8285 (where tstats used to go to R and G) and connect to Taco Boiler Isolated End Switch.  And just let the R8285 do what it always did, control boiler, circulator, exhaust flap, etc...

Please confirm.


  • ZmanZman Member Posts: 6,002
    Yes, yes and, yes.
    I love those zone controllers, they clean up the wiring and make troubleshooting simple.
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
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