penfrydd said:
I guess my question relates to very basic "rules of the road".
Such as...does an expansion tank have to be above any other piping, or are they usually elevated just to get them out of the way?
Depends... If one is doing a high tank "open" system where the system is pressurized by the water column, then the ET absolutely has to be above everything else. On a closed system, it is customary for various reasons to put the ET connection to the rest of the system at the boiler outlet. If the ET is small, putting it at the connection point is simple and logical. However if you have a big ET, then it isn't at all unusual to have a pipe running from the connection point over to the tank itself, which can be put anywhere.
[/quote]My other problem with schematics/diagrams in general is, they don't match up with provided photos. For instance, picture in Solo 40 install manual shows overheat zone coming out of tapping for pressure relief valve, but diagram shows it coming out of general supply pipe. Either one would work. but it does lead to confusion for some of us. Also, diagram shows pipe to overheat zone with a rather random union before the automag. It would have been much clearer to draw the union much closer to the automag, as this is where it would logically be.
I know it's just the nature of schematics. I occasionally need to follow electrical schematics to repair golf course equipment and they can be frustrating. Eventually all makes sense, but schematics certainly aren't the same as "maps".
I'm done venting. Back to my cup of coffee and my soldering torch!
penfrydd[/quote] A lot of the confusion I think may relate to the idea that there are several different "levels" of diagram... At the highest level, you can have "concept" diagrams that just show the major components, without worrying about fittings, pipe sizes, and so forth, and then go down to deeper and deeper levels of detail until you get to the "blueprint" level that should be an exact map of the system as it will be turned into hardware...
The people posting them don't always make it clear what level of drawing they are posting, and may not even be sure themselves... My own preference is to have the level of detail needed, but no more than that...
Gooserider