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    fioddy's Avatar
    fioddy Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Oct 27, 2013, 06:29 PM
    3 zone heating using honeywell L8124A
    I recently added a third heating zone to heat a finished basement. With the current configuration, there is 1 circulating pump for all zones and each zone uses a separate Taco 571-2 zone valve. I tested the basement zone and that appeared to be working fine at first. Later I discovered that the 1st floor zone valve was turning on when I set the basement thermostat for heat even though the 1st floor thermostat was set to off. I tried turning off the basement thermostat and turning on the 1st floor thermostat to call for heat and found that both zone valves were on. I believe that I mis-wired the basement zone but don't know what is mis-wired.
    Grady White's Avatar
    Grady White Posts: 1,417, Reputation: 59
    Ultra Member
    		  
    #2

    Oct 28, 2013, 06:35 PM
    Did you use a separate transformer for the zone valves? This may help: vernonwinnelson.com - Taco Zone Valve Chart
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