CALEFFI QuickSetter+ 132654AFC Manuale - Pagina 10

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Application: Balanced recirculating systems

An example recirculation system is shown below:

Multiple hot and cold water risers are supplied from common hot and cold water mains. The

number and type of fixtures served by each set of risers will often be different. A recirculation

riser accompanies each set of hot and cold risers. A single circulator provides recirculation flow

through the entire system.

This type of piping network is similar to a 2-pipe direct return distribution system for hydronic

heating. Because of differences in the lengths or sizes of both the main piping and riser piping,

the recirculation flow through each set of risers is likely to be different. This can lead to different

temperature drops between the beginning of a given hot water riser and the end of its associated

return riser. This may cause the hot water temperature arriving at a distant fixture to be insufficient

for the intended usage.

This situation can be corrected by "balancing" the recirculation flow between the various sets

of risers. The goal of such balancing is to establish recirculation flow rates that create equal

temperature drop between the start of each hot water riser and the end of its associated return

(recirculation) riser.

Balancing is enabled with the QuickSetter+ 132X38AFC, balancing valve with flow meter, tempera-

ture gauge and check valve, near the end of each return riser. These valves are 0.25% max. lead

brass, certified to 2014 lead plumbing law by IAPMO, rated for contact with potable water.

The QuickSetter+ 132X38AFC includes a check valve so when installed as shown near the end of

each recirculation riser to prevent reverse flow. Also, when the risers are vertical, as shown, the

recirculation pipe should tee into the hot water riser below the final fixture take off. This allows any

air bubbles that may be present in the hot water riser to leave each time hot water is drawn at the

highest fixture.