Zoning a hot water boiler baseboard system

Hi,

My home previously had three zones until the previous owners removed the zone valves and thermostats. They wired the three circulators on the return side of the boiler together directly to the furnace aquastat. I purchased new Honeywell thermostats, one being wireless for upstairs and a Taco switching relay SR5404-4.
Just for fun, I physically disconnected two of the circulators and the water still circulates through all three zones when the one circulator calls for heat. I believe I need to install check valves on the supply side of each zone but want to confirm this is the right path to take. Thank you.

 

Flow check valves should be on all three zones unless the circulator(s) have internal check valves.

 

If you want to use circulators instead of zone valves you will need flochecks on each zone on the supply side to stop the heated water from going into unwanted zones.

On a call for heat the flow from the circulator will force open the flocheck and allow the water to go only to that zone.

Below is a sample of what you need.

You can also get circulators with built in check valves as shown below also.

https://www.supplyhouse.com/sh/contr...hText=flocheck

https://www.supplyhouse.com/sh/contr...chText=flochek

Hope this helps a little.

 

Great! Thank you for the help!