Piping Question : Bypass for Temp Red Valve

Cheeze-Tech

Today I had one of those "long story" jobs and I believe I found a problem with the piping for the mixing valve bypass feeding the basement in floor. The house is just a three bedroom ranch with two monoflo tee loops for the upstairs and a third loop for the copper tubing in the basement floor. The supply piping comes out of the boiler to three zone valves. The basement supply then goes to the mixing valve. On the return side: the bypass for the mixing valve comes off between the pump (pumping into the boiler) and the boiler. We had removed the zone valves, at the homeowners request, and I was reinstalling them, again at the home owners request (long story), when I found out from her that one of her complaints was that with the 3 zone valves the basement was always too hot (originally the whole house was one zone untill an addition was put on). If I am looking at things right that would be because of where the bypass is. Any time any of the zones would call you would get flow to the basement thru the bypass wouldn't you? I added a second zone valve, tied to the basement zone valve, to the bypass line. This would close it off and prevent flow from the other zones. Another fix might have been to move the basement zone valve to the return side. The bypass was 3/4" copper and the return 1" iron so that's why I added the valve. Does this make any sense?

Cheeze-Tech

Piping Question Re: Mixing Valve Bypass

Today I had one of those "long story" jobs and I believe I found a problem with the piping for the mixing valve bypass feeding the basement in floor. The house is just a three bedroom ranch with two monoflo tee loops for the upstairs and a third loop for the copper tubing in the basement floor. The supply piping comes out of the boiler to three zone valves. The basement supply then goes to the mixing valve. On the return side: the bypass for the mixing valve comes off between the pump (pumping into the boiler) and the boiler. We had removed the zone valves, at the homeowners request, and I was reinstalling them, again at the home owners request (long story), when I found out from her that one of her complaints was that with the 3 zone valves the basement was always too hot (originally the whole house was one zone untill an addition was put on). If I am looking at things right that would be because of where the bypass is. Any time any of the zones would call you would get flow to the basement thru the bypass wouldn't you? I added a second zone valve, tied to the basement zone valve, to the bypass line. This would close it off and prevent flow from the other zones. Another fix might have been to move the basement zone valve to the return side. The bypass was 3/4" copper and the return 1" iron so that's why I added the valve. Does this make any sense?