Click on the link above for the diagram.
This is an example of how to use a Gas Boiler to produce different water temperatures for 5 zones (High / Low Temperatures) plus a zone for the Indirect Hot Water Tank.
You will notice that in this example there are 3 possible temperatures for the heating zones. There are 3 zones for high temperature that can feed radiators or baseboard convectors at whatever the boiler water temperatures is set to. There are 2 zones for a set temperature that could be used for pex radiant heat zones at different water temperatures.
This is only an example. Actual layouts vary from job to job.
Primary/Secondary Piping – The “backbone” of modern hydronic multizone / multi temperature heating systems in which the pressure differential of the primary circulator is uncoupled from the pressure differentials of the secondary circulators. This protects the independent flow rates of both Loops. The primary pump will always be on when any of the secondary pumps are on. Separation is accomplished through the use of closely spaced tees
ReplyDeleteSizing: Tees are separated by 4-pipe dia. (Max) Upstream by 8-pipe dia. (Min) Downstream by 4-dia. (Minimum) (Up and Downstream is straight pipe)