I’m currenty reviewing all course materials, a second time, in preparation for the final exam.
In reviewing the Plumbing Course, section 5.8 specifically, I noticed that the ‘tankless coils from boilers’ illustration appears to be missing a couple of components, and potentially a misplaced component.
I’ve included the illustration, which I modified to show the locations of concern
Hoping a second set of eyes could confirm, and or clarify the following:
1). Incoming domestic water - Shouldn’t there be a check valve\backflow preventer with an atmospheric vent installed?
2) Incoming domestic water - Shouldn’t there be a pressure reducing valve installed after the check valve\backflow preventer?
3) Cold water return - there appears to be a pressure reducing valve here - do these systems require a reducing valve at the return?