Cjlambert
Red-Seal Licensed Plumber
We have installed the plumbing for a massive addition onto an existing house. Pictured below is the schematic for the entire house’s water distribution system.
All of the new shower valves we installed have their partition stops closed, the check valve and pump are definitely in the correct orientation, and at no point does a hot feed tie into a cold feed (obviously...), except downstream of the check valve (where the recirc ties back into the cold feeding the water heater).
With the recirc pump turned on, and all valves in the schematic open, there is no problem.
However, with the pump turned off, and the ball valve next to the pump closed, and every valve on the addition’s hot manifold closed, 5-10 minutes later, the old/existing hot feed begins to drastically drop in temperature, to the point of hardly any warmth at all. Also noticed that the recirc main on both sides of the check valve become Very cold, (even 15 feet upstream of the check valve).
Why is this happening?
All of the new shower valves we installed have their partition stops closed, the check valve and pump are definitely in the correct orientation, and at no point does a hot feed tie into a cold feed (obviously...), except downstream of the check valve (where the recirc ties back into the cold feeding the water heater).
With the recirc pump turned on, and all valves in the schematic open, there is no problem.
However, with the pump turned off, and the ball valve next to the pump closed, and every valve on the addition’s hot manifold closed, 5-10 minutes later, the old/existing hot feed begins to drastically drop in temperature, to the point of hardly any warmth at all. Also noticed that the recirc main on both sides of the check valve become Very cold, (even 15 feet upstream of the check valve).
Why is this happening?