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Resistor with T8775 thermostat
the old "Green" heads or new "Gold" versus the ESP Valves.
The procedure for Gold and Green is: (Three wire valves)
1. With the thermostat calling you should Have 24 volt power at terminals 1 and 2. If you do not check your transformer or thermostat.
2. With power applied to terminals 1 & 2 the head should start to get warm and "smell" like it is burning (good sign). After about 1 minute to 2 minutes terminals 2 & 3 should make internally (this is the end switch) and the relay should pull in. If that does not occur then place a jumper across 2 & 3 this should pull in the relay so you would have determined that the relay is okay and the end switch did not make. End switch contacts can be adjusted but I would have to show you how to do it. It cannot be explained.
3. One other thing about Taco Zone valves you can run three of them on one 40 VA NEMA rated class II transformer that conforms to standard DC20-92.
4. Set you anticipators on thermostats to 1.2 as this will give you a better cycle with TACO ZV's.