4-Zone Taco Switch Relay with (4) Ecobee Lite 3 Thermostat

New to the forum, and I'm not a HVAC expert. I hired the electrician and HAVC professional to install my new boiler. They installed the 4-Zone Taco Switching Relay (SR504-4), (4) Taco circulators (at the return side?), and wired (4) Ecobee Lite 3 thermostats. Everything seems to work fine, the heat can be turned on, all ecobee thermostats are on, except the zoning doesn't really work. No matter which ecobee thermostat calls for heat, all zones are heating up at the same time. Electrician and HVAC professional is pointing finger to each other and not really being helpful.... Can anyone tell me what is wrong with the set up? Any help would be greatly appreciated! Additional Note, I tried to ungroup the blue wire (C wire) goes into the com terminal, even with only (1) blue wire connects to com terminal, still all zones heat up when the single thermostat is powered.

 

Y,
When you say all zones heat, do you mean all pumps are running or heat is circulating through all zones with only the designated pump running.There is a difference. With circulators you must install FLO CONTROL VALVES on each zone to prevent water circulating through all zones when only one zone calls. If you could take a pic of the Supply lines higher up. You should have 4 control valves on your supply lines.
Hope this helps a little.

 

Hi Spott,

Thank you for the help! What you saw on the picture are all the components I can visually see. If the flo control valve is not in the picture, then I guess that means it was not installed. My 2 cents are because the circulators are installed at the return side, therefore there is no control for the hot water to flow up the pipe (on the right). In regards to if all pumps are running, I will find out later today. I believed only single pump for that particular zone will be running as I only heard the motor from that single pump..

 

T,
If only 1 pump is running and there is heat to all zones then the Flo contol valves are missing. As far as the pumps being installed on the return that is perfectly all right. Although today the trend is for the pumps to go on the supply, for the past 40 yrs. they were installed on the return as mine is and they worked fine. On residential systems it makes very little difference. Commercial systems are different and the pumps are on the supply. In your case it makes no difference. A pump is there to only circulate the water to the selected zone and the flo checks are there to prevent water circulation to unwanted areas. In your present situation any pump will send heat to all zones.

219-4 - Taco 219-4 - 3/4" CxC Horizontal (Bronze) Taco Flo-Chek (supplyhouse.com)
Above is 1 example of what you need with pumps. Zone valves do not need this component.

 

Noted! Much appreciated!! For the flow control vault, shall it be installed on the return or supply? and before/after the circulator?

 

T,
On each supply line for each zone. Whoever piped your boiler should know.