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Old 12-21-2011, 09:06 AM   #1
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Zone Valve for Hydronic system


I am adding on to my in floor heating system. I have a large shop which will be on a separate manifold, yes the boiler is sized for this. I am installing Honeywell 24V Zone Valves. My questions is do I use Normally open valves or Normally closed. I am sure either can be made to work but is the a benifit to one over the other? These are installed on the return lines?

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Old 12-21-2011, 08:20 PM   #2
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Zone Valve for Hydronic system


The benefit of normally closed valves includes more freedom of controls.
24 volts to open is something that any thermostat can provide. This is my preference when piping in high rise heating and chill water valves (on the return pipe).

That said, normally open valves will provide heat if your control fails. This might save your pipes (or toes) from freezing one day should control failure occur.

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Old 12-21-2011, 08:58 PM   #3
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Zone Valve for Hydronic system


YOu can use the Taco 24v valves which have a handle to open them manually....like a large version of a water heater relief valve.
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Old 12-21-2011, 09:03 PM   #4
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Zone Valve for Hydronic system


Most honeywell 24V zone valves have levers that can be manually opened and then pulled over to one side to lock into an always open position.
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Old 12-21-2011, 09:07 PM   #5
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Zone Valve for Hydronic system


Quote:
Originally Posted by how View Post
Most honeywell 24V zone valves have levers that can be manually opened and then pulled over to one side to lock into an always open position.
Thanks for the info.
I haven't used those, our supplier has Taco only.
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Old 12-21-2011, 09:18 PM   #6
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Zone Valve for Hydronic system


Erie and Belimo can also have this lever to manually open the valve.

Most control valves can be manually opened.

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