SR series enhanced switching relays by Taco are the best choice in the industry for zoning with circulators. Relay acts as intermediary between the boiler, 115V circulator pump(s) and 24V thermostat(s), allowing to control several pumps using a single thermostat, or, if the system has several zones, use multiple thermostats to control particular sets of one or more circulators.
With only two wires the power stealing nature of that stat shows up as voltage, sometimes as high as 18V coming back to the relay when the stat is in the off position. The resistors "shed" or pull down that stray voltage. Basically they turn that energy into heat, so don't touch the resistor when it is powered
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The 1 zone switching relay is an excellent choice for all your zoning needs. The unit comes with external diagnostic lights, and is 100% factory tested. In my opinion the taco switching relays are easier to wire then the Honeywell models. Date published: 2019-04-24.
Zone Valve Wiring Hookups for Hydronic (Hot Water) Heating Systems. Individual Hydronic Heating Zone Valve & Control Wiring Notes by Brand. Illustration: the wiring diagram for the Taco ZVC 403 Multiple-Zone-Valve Controller. [Click to enlarge any image] - be sure to check the exact wiring diagram for your particular control and application.
Simplified Wiring Taco Relays are solid state switches, rather than ice cube switches for longer life. Each one is fuse protected.