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Posted by HeatPro on July 26, 2006 at 17:57:51:
In Reply to: Zone Valves posted by SwampCat on July 26, 2006 at 17:24:09:
Sorry, but you do not have it figured out. Let me reinterpret the question from the data you gave.
You don't know which indirect DHW tank you have or you would have given that information, as to how it is connected and the control system planned depends on knowing which make and model you have with which boiler you are using AND your preferences which may equally be as good one way or another.
You will see that each make and model has its own restriction to the flow of water - some a high resistance through a small coil, some a low resistance through the tank or a large diameter coil.
Some tanks even act as a large water storage mass with what is a tankless coil inside.
How you pipe them to make the best advantage of each type depends on those and other factors. After you have planned the way it is to be used and piped, you seek a suitable control design. As none of that is forthcoming you are then restricted to the knowledge that each advisor claims.
It might be that a novice will advise, thus working from the grand error: "There is only one design of indirect DHW tank that all manufacturers copy and therefore there is a universal piping and control wiring that all must use."
Another grand error grows from the probability that many if not most plumbers decide upon one way of using the brand they are most familiar with. Thus if they advise you without knowing WHICH tank and boiler you have, they may misapply information meant only for their favorite pick.
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