Convert from zone valve to zone pumps
Right now I have a 1 punp 3 zone hydro. One HW and 2 living. I want to add a radient underfloor loop via mixing valve. While doing this it seems cleaner to just do all the zones with new pumps and a 4 zone switch relay. I have the pumps already so the cost to convert is not an issue. The question I have is:
do the pumps for each zone act as valves. What I mean is... If a zone is not active and another is.... Is anything needed to isolate the zone as a zone valve does? Or will the pumps do this? (i.e. when pump is not moving it is a closed zone) All the schemas I have seen show the boiler --> pump --> zone --> boiler.
This is a nice little spring project I have planned.
Curently I have one zone running way too many radiators. 2 floors on zone, small room on zone 2, HW on zone 3.
I want to clean this up and have living spaces on 1, bedrooms on 2, Basement on 3, HW on 4.