How to zone valve/pump question

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Old 07-16-08, 08:31 AM
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How to zone valve/pump question

I currently have a gas fired hot water high temp system. Four zones, using zone valves (Argo zone controler) and one main pump on the boiler. I wnat to add a few low temp zones for radiant heat. My question is how would I zone out the radiant side. Do I need to install a second pump just for the radiant ? How would I control the pump ? Any help would be great.
 
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Old 07-16-08, 12:14 PM
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I am not fully trained in radiant in floor heating, but I am pretty sure you do need a separate circulator, because with radiant, you need to control the flow and water temperature differently than standard baseboard. That much I do know.

I am sure one of the other heat techs will be dropping in and will hopefully have more info for you. (and me)
 
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Old 07-16-08, 06:27 PM
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Thanks for taking the time and responding to my question. I am pretty sure I need a second circ. pump for the radiant side. I am just not sure how to turn on two pumps and fire the boiler. I also know I need a mixing valve to get water to radiant temp. Right now when thermostat calls for heat the zone valve opens, the flue opens and the boiler fires.

Any help would be great
Thanks
 
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Old 07-18-08, 06:31 AM
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A very simple method would be to use a Taco RMB (radiant mixing block). It's a small all in one unit, that has a circulator for the actual radiant loop(s), an injection circulator to mix the water temperature down to what it needs to be as well as a controller to control the water temps based on a t-stat and an outdoor temperature sensor. They are in the thousand dollar range at your local supply house but form an excellent easy to pipe solution.
 
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Old 07-18-08, 07:39 AM
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A second vote for the Taco RMB. More up front cost, but a breeze to pipe, wire, and control that definitely makes up for the higher initial cost. Much less labor and design involved.
 
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Old 07-18-08, 06:58 PM
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Thanks for responding to my question. I will look into the Taco RMB. Hopefully I can figure out how to wire so the boiler main pump turns on and the boiler fires when the Radiant side calls for heat.

Thanks again
 
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Old 07-18-08, 07:28 PM
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Start here:

http://taco-hvac.com/en/products.htm...t_category=120

Wiring guides, application guides, and even a couple videos!
 
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Old 07-19-08, 07:59 AM
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Thanks for the info I'll check the link out
 
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