taco zone valves

Joe Mattiello

The Thermostat which acts as the switch is what calls for heat when room temperature drops below set point temperature. The thermostat is in line with one leg of the transformer, and the zonevalve, so if the thermostat is stuck closed you would have a constant 24 volt supply to the valve, or demand for heat. You mentioned taken the actuator off the valve body, if the valve had 24 volts going to it, and the valve actuator was working properly, you wouldn’t be able to take the actuator off with a lot of difficulty. If you did take it off, you may have damaged the valve. The piston may have over extended without a positive stop, and not go back to the original position causing the end switch to remain closed. For your reference I attached a troubleshooting guide.

chuck_9

taco zone vales

I have A taco zone valve that keeps calling,replaced all new them. wires,took head off to see if valve body was keeping it up,put new power head on still keeps calling,going to try t-stat next,any help.

Al Letellier_9

taco zone valve

Are you sure it's calling?? Does it make the circulator run and the boiler start or is the zone overheating by gravity flow because the plunger in the valve is stuck in the open position? Change the stat and if its still hot, check the valve body itself. Just thinking out loud....

To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

David Sutton_6

Hello

Try removing the #1 wire should be red from t-stst see if it stops..3 wire will call on circ.

To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

David Sutton_6

Nice Joe!

Thank you! i printed a copy, i use to have a sheet like that yrs ago but lost it. nice to have it back , you the man!...David

To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"