Taco Zone Valve hack?

Unfortunately there isn't a quick fix to change from n/o to n/c. If you ever have a question on a Taco product please call 401-942-8000 just ask for Tech Support and any one of us can help you. We are here Mon-Fri 8am-5pm EST.

If I got this right the valve is open when there is no power to it and it closes when you power it. If thats how it works you can use a 90-340 relay and the power the valve through the NC contacts and tie the tstat to the relay coil and that will open the contacts and drop power to the valve.

Do yourself a favor... get the correct valve. if the manufacturer of that valve has a NC valve you may get off easy by just changing the guts without soldering the new valve body.

Put the wrong guts on the unused valve body and sell them on eBay or Craig's list.

Can you reverse the wiring on the internal 24v motor?

that would require people to read the instructions.

With DC wiring, it may be just that easy. With the 24 VAC control current normally used in HVAC controls, that may not be the case.   That's because the current travels in both directions at 60 cycles per second, so reversing the wires will cause the current flow in both directions at 60 cycles per second.  No difference.

Another problem may be in the design of the actual valve.  If the valve has a spring to open and needs power to close, then reversing the wires on a motor will not change the fact that the spring will always open the valve when there is no power. The OP would need to change the design so the spring would close the valve and then power the valve to open it by reversing the motor direction.  Not so easy if you don't own a machine shop with all kinds of drills and lathes and a stock of different springs so you might find just the right one for that valve.

But that was a fair question for @jacoblahr. Welcome to the forum. Be sure to read the rules by clicking at the top of the page or

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what about power open power close. White Rogers made this crazy thing.

I believe it is a taco zone sentry so it is power open power close but it stores the energy for the deenergized direction in a capacitor. I bet it is changing the indexing of the drive gear by 90 degrees so it is turning the ball starting from the closed position instead of the open position.

If you're asking if it matters which motor lead connects to 24 volts or Common, then no. The motor doesn't care.

I guess Taco does sell a motorized spring return valve. Looks a lot like some other brands😗

I don’t see a n.o. Version offered?

Generally big fan of random hacks, so took a quick look at a Taco valve.

@jacoblahr is correct. The internal motor is DC and you can reverse the wires on it. There is no physical end of travel switch, look like the motor runs until a current limit is reached which is considered end of travel.

The one issue with this type of hack is eventually somebody else will have to fix this. They will not know about what is inside the valve and replace it like for like creating a lot of headache. At minimum I would do a future a solid an include a tag on there about the mods.

I've been slowly de-hacking my house heat specifically to avoid the above issue. These are hard enough to troubleshoot, adding extra complication is cost more than getting the right part.