Cosmo Multi 2 Montage- Und Bedienungsanleitung Seite 117

5. Troubleshooting
Stores cool down at night
Collector circuit pump
runs in the night?
no yes
Collector temperature is
at night higher than the
outdoor temperature
no yes
Sufficient store insula-
tion?
yes no
Insulation close enough
to the store?
yes no
Are the store connec-
tions insulated?
yes no
Warm water outflow
upwards?
no yes
a
Check controller
Check the non-return
valve in the flow and
the return pipe with re-
gard to the functional
efficiency.
Increase insulation.
Replace insulation or
increase it.
Insulate the
connections.
Change connection and
let the water flow side-
wards or through a si-
phon (downwards); less
store losses now ?
no yes
o.k.
a
Does the warm water
circulation run for a
very long time?
no yes
Circulation pump and
blocking valve should be
switched off for 1 night;
less store losses?
yes no
Control the non-return
valve in warm water cir-
culation - o.k.
yes no
The gravitation circula-
tion in the circulation
line is to 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
117
Use the circulation
pump with timer and
switch-off thermostat
(energy efficient circu-
lation).
C h e c k w h e t h e r t h e
pumps of the after-he-
ating circuit run at night;
check whether the non-
return valve is defective;
problem solved?
no
Further pumps which
are connected to the
solar store must also be
checked.
Clean or replace it
is closed;
c o n n e c t p u m p a n d
2-port valve electrically
in parallel; activate the
circulation again