STIEBEL ELTRON SOM 9s - Manual (Page 100)

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SOM 9s
Tanks cool down at night.
Collector circuit pump
runs in the night ?
no yes
Check controller
Collector temperature is
at night higher than the
outdoor temperature.
no yes
Check the non-return
valve in the flow and the
return pipe with regard to
the functional efficiency.
Sufficient tank insulation?
yes no
Increase insulation.
Insulation close enough to
the tank?
yes no
Replace insulation or in-
crease it.
Are the tank connections
insulated?
yes no
Insulate the connections.
Warm water outflow up-
wards?
no yes
Change connection and
let the water flow side-
wards or through a siphon
(downwards); less tank
losses now ?
Does the warm water
circulation run for a very
long time?
no yes
Use the circulation pump
with timer and switch-off
thermostat (energy effici-
ent circulation).
The solar circuit pump does not work, although the coll-
ector is considerably warmer than the tank.
Display illuminated? If not,
press button
5 . Display
illuminated now?
yes no
Does the pump start up in
manual operation?
yes
There is no current; check
fuses / replace them and
check power supply.
The adjusted temperature
difference for starting the
pump is too high; choose
a value which makes more
sense.
no
Is the pump current
enabled by the controller?
yes
Is the pump stuck?
Turn the pump shaft using
a screwdriver; now pas-
sable?
Pump is defective - re-
place it.
Controller might be de-
fective - replace it.
no
yes
no
Circulation pump and
blocking valve should be
switched-off for 1 night;
less tank losses?
yes no
Check whether the pumps
of the backup heating cir-
cuit run at night; check
whether the non-return
valve is defective; problem
solved ?
no
no yes
o.k.
Control the non-return
valve in warm water cir-
culation - o.k.
yes no
Further pumps which are
connected to the solar
tank must also be che-
cked.
The gravitation circula-
tion 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 Clean or replace it.
closed; connect pump and
2-port valve electrically in
parallel; activate the circu-
lation again. Speed control
has to be deactivated.
a
a b
b