shut of and drain valve placementin Home Run Heating
I have a Home Run 2 zone heating system installed. I am adding the 3-rd zone.
On each return line in each loop Contractors put shut off valves. There is only one Drain valve for the whole system.
If I am correct, currently there is no way to drain each loop,only all together. Also I do not think I can isolate a particular loop in case of a problem with the loop since I only have shut off valves on return lines.
Since I am going to install the 3-rd zone, I would like to make it correct.
What should I do in order to have:
Ability to drain each loop separately
Ability to isolate each loop
Should I install shut off /ball valve on return and supply line on each loop and Drain valve on return line of each loop?