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Converting old Electrozones to Honeywells..hot water system

DWB
DWB Member Posts: 2
in THE MAIN WALL
I'm a plumber w/ limited heat and wiring experience. I'm replacing 2 old electrozone zone valves and the manifold below them to new Honeywell zone valves. Small boiler, 3/4 inch valves, and I think the gas valve is millivolt. Do I need a special relay for the conversion? Not sure if this is enough info, but any feedback would be appreciated.

Comments

  • Big Ed
    Big Ed Member Posts: 1,117
    Zone valves

    There are four wires or terminals (dependind of choice of model) on the Honeywell .The two yellow wires are to activate motor. The two red are a end switch. When valve fully open it trips the end switch. The end switch goes to TT on a relay which engages cirulator and if set up this way ,will also turn on burner.The relay of chioce would be A double pole .One set for 110v circ & a second for milli volt burner or even 24v model.

    The wiring for zv motor...Transformer -thermostat(RH-W)-thermostat-one yellow lead ZV-other yellow lead -to other side of transformer.

    To size transformer find amp draw on zv .I think are .3 A .mutiply by voltage which is 24V equals VA transformer needed... Say 6 valves 6x.3A x24V is 43.2 VA. use 50VA transformer for the bunch

    Hope this helps but does not confuse....
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