I'm working on an existing commercial hot water heating system that uses two boilers and a storage tank. I've drawn a picture of what I don't understand, note that there are shut off valves and an expansion tank on this system that I did not draw. There is NOT any check valve however with the exception of one possibly built into the pumps.
My first question is, should there be a check valve on the cold water feed right before it gets to the boilers? Other than physics, what's stopping it from circulating back to the mixing valve?
My second question is, shouldn't there be some sort of communication between the two boilers? There isn't any lead / lag or any indication of when to fire other than the aquastat.
Thank you!
My first question is, should there be a check valve on the cold water feed right before it gets to the boilers? Other than physics, what's stopping it from circulating back to the mixing valve?
My second question is, shouldn't there be some sort of communication between the two boilers? There isn't any lead / lag or any indication of when to fire other than the aquastat.
Thank you!
