Solar Panels (Roof Mount)

[tphaggerty]

No, the vacuum breaker valve is referred to as the "vacuum relief valve #13" in your diagram. The 3 way valve is what diverts the normal pump flow to and from the panels. The vacuum breaker/relief valve really isn't a valve, it is more like a one way shut shut off.

When the system is running, the breaker is shut, no air in or out. When the system is off, the water wieght causes the breaker to open inward and admit air (it works because the vacuum pressure caused by the weight of the water in the pipes and panels trying to go home to your pool pulls it open).

But the diagram you are working from looks really good! Just remember, make sure that the system is higher at #13, my installer used a 1 foot drop over the 24 linear feet or so of our panel run.