73
en
Is the pump current enabled by the
controller?
Display illuminated?
If not, press button
➄
. Display
illuminated again?
Does the pump start up in manual
operation?
The solar circuit pump does not work, although the collector is considerably
warmer than the store.
yes
no
yes
There is no current; check fuses
/ replace them and check power
supply.
The adjusted temperature differ-
ence for starting the pump is too
high; choose a value which makes
more sense.
no
yes
no
Stores cool down at night.
Collector circuit pump runs during
the night?
no
yes
Check controller
Check the non-return valves in
the flow and the return pipe for
functional efficiency.
Sufficient store insulation?
yes
no
Increase insulation.
Insulation close enough to the
store?
Replace insulation or increase it.
Are the store connections insu-
lated?
yes
no
Insulate the connections.
Warm water outflow upwards?
yes
Change connection and let the
water flow sidewards or through a
siphon (downwards); less store
losses now?
o.k.
yes
yes
no
a
no
Collector temperature at night is
higher than the outdoor temperature.
no
no
yes
Controller might be defective -
replace it.
Is the pump stuck?
Turn the pump shaft using a screw-
driver; now passable?
Pump is defective - replace it.
yes
no
Does the DHW circulation 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
afterheating circuit run at night;
check whether the non-return valve
is defective; problem solved?
yes
no
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 connect-
ed to the solar store must also be
checked.
Check the non-return valve in warm
water circulation - o.k.
Summary of Contents for SC5.14
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