36
en
The solar circuit pump does not work, although the collector is considerably
warmer than the store
Is the operating control LED on?
Does the pump start up in manual
operation?
The adjusted temperature differ-
ence for starting the pump is too
high; choose a value which makes
more sense.
Is the pump current enabled by
the controller?
Is the pump stuck?
Turn the pump shaft using a screw-
driver; now passable?
There is no current; check fuses /
replace them and check power
supply.
Pump is defective - replace it.
Is the fuse of the controller OK?
Controller might be defective -
replace it.
Replace the fuse.
Store cools down at night.
Collector circuit pump runs
during the night?
Check controller
Collector temperature at night is
higher than the outdoor temper-
ature.
Check the non-return valves in
the flow and the return pipe for
functional efficiency.
Sufficient store insulation?
Increase insulation.
Insulation close enough to the
store?
Replace insulation or increase it.
Are the store connections
insulated?
Insulate the connections.
Warm water outflow upwards?
Change connection and let the
water flow sidewards or through
a siphon (downwards); less store
losses now?
o.k.
a
Does the DHW circulation run for
a very long time?
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?
Check whether the pumps of the
backup heating circuit run at night;
check whether the non-return
valve is defective; problem solved?
Check the non-return valve in
warm water circulation - o.k.
Further pumps which are connect-
ed to the solar store must also be
checked.
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.
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