STIEBEL ELTRON SOM 10 - Manual (Page 79)

79
en
Does the warm water circula-
tion run for a very long time?
no yes Use the circulation pump with
timer and switch-off thermostat
(energy efficient circulation).
Circulation pump and blocking
valve should be switched-off for
1 night; less store losses?
yes no
Check whether the pumps of the
backup heating circuit run at night;
check whether the non-return valve
is defective; problem solved?
no
yes no
a
The gravitation circulation
in the circulation line is too
strong; insert a stronger valve
in the non-return valve or an
electrical 2-port valve behind
the circulation pump; the 2-port
valve is open when the pump is
activated, otherwise it is closed;
connect pump and 2-port valve
electrically in parallel; activate
the circulation again. Deactivate
pump speed control!
Clean or replace it.
Further pumps which are connec-
ted to the solar store must also be
checked.
Check the non-return valve in
warm water circulation - o.k.