COSMOGAS AGUADENS Series, Installation, Operating And Maintenance Manual

Page: 22 / 72

22 AGUADENS
COSMOGAS
5.12 -
External secondary
return configuration
if the appliance is envisioned with secondary recirculation
(see figure 4-5), operate as follow:
1.- install the appliance as shown in figure 4-5;
2.- open one tap of the sanitary utilities to eliminate
presence of air;
3.- turn off the secondary return pump;
4.- open one hot water sanitary tap and wait until the hot
water temperature is stable;
5.- close the hot water sanitary tap;
6.- check that after 50 seconds after closing the tap, tap
icon on the display has stopped flashing;
7.- if the tap icon keeps flashing, it means that the internal
pump can run the water in the secondary return circuit to
a value above 2 l/min (verifiable on the parameter 1062).
8.- operate on the valve “A” of Figure 4-4 in order to bring
the recirculation flow rate to a value lower than 2 l/min;
9.- now the appliance can work correctly.