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BOILER SYSTEMS AND OPERATION
SL 10-85 G3, SL 14-115 G3, SL 20-160 G3, SL 30-199 G3 MODULATING GAS BOILERS
Parallel load piping - Benets and installation rules
Compared with the Primary/Secondary approach, the design below saves one pump. Lost
is the simplicity of constant head and ow at the boiler.
Figure 38: One pump parallel piping concept
Figure 39: Two pump, two load parallel piping concept
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