Zone Valves, Circulators, Relays & Controls 

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We appreciate your feedback! Thank you, HalfPoundBobby!

Glad you found the issue! Good work!

🙂

Good Day Bob, Thanks for watching the Taco Tuesday webinar series. We make all styles of zone valves in many different configurations. There are some that are normally closed (NC) and then some that are normally open (NO). In most instances, we use NC valves which means while the valve is sitting there, without power, is closed until there is a call for heat, the motor gets power and open the valve. The Zone Sentry zone valve uses that power a little differently. When the call for heat occurs, power is applied to the motor, the capacitor gets charged and when it fully charges, the power is discharged and the valve opens. While the valve is open, the capacitor now recharges and when the call for heat goes away, power is removed from the motor, the capacitor discharges again therefore closing the valve. I hope this answer your question and if not, please do not hesitate to contact us or your local Taco representative.

Yes we need an explanation of that how the tankless get priority.

Hello David, The ZC ZR terminals on a Switching relay are used in a boiler that has a tankless coil. In other words, the boiler is maintaining a temperature and not a cold start for domestic hot water for the home to be available. When there are multiple heating zones in the house and those zone circulators are controlled with a SR panel, you then remove the factory installed jumper between ZR and ZR and connect it to aquastat that is controlling the water temperature. The result is when the aquastat calls for heat, it would temporarily shut off the power to the zone circulators to ensure all of the heat the boiler is making is used for the domestic hot water.

Ted, If you had a DHW circulator and a heating circulator that supplied zone valves for heating the house, you would need a ZVC controller that would control the zone valves only and then you need to us a Switching Relay (SR) for the 2 circulators.

One thermostat and 3 circulators?

Hi Carl, The SR-503 is designed as an interface between your low voltage thermostats and your high voltage circulators. There are many applications for the switching relays and you can view the different wiring diagrams here and find the one that matches your application. www.tacocomfort.com/documents/FileLibrary/100-92.pdf

dspreeuw, thanks so much for watching the Taco Tuesday webinar series. Before I answer that question, can you tell me what model boiler you are using so that I may review the product and recommend the correct controller? Thanks

@@TacoHVACtv I missed the live webinar, but viewing now via RU-vid. I am presently considering installaton of a Lochinvar NKC Combi, which uses 0- to 10- volt signal. Residence is presently one zone; slight possibility of one additional zone added later. Which Taco controller can be used? And, how would it integrate with the internal Lochinvar NKC pump? I have benefitted from viewing webinars a great deal. Thank you John, Dave, and Rick.

Fernando, the Zone Valve Controller (ZVC)has two indicator lights on it per zone. The one on the left is amber in color and when lit, indicates that the thermostat has a call for heat. The light on the right is red and indicates that the zone valve has opened and the endswitch on the zone valve has closed. If you have just the amber light and not the red, this will indicate that the motor of the zone valve may not be operating properly. If you have just the red light and not the amber light, the endswitch in the zone valve may have a problem. I hope this helps you find your issue.

It sounds like you may have an endswitch inside the zone valve is stuck or broken. Yes you can turn off the flow of heat to that area but there may still be a call to the boiler until it is corrected. What zone valve are you using?