Resol DeltaSol AL E Manual For The Specialised Craftsman page 34

The solar circuit pump does not work, although
the collector is considerably warmer than the
store.
Operating control
lamp of the controller
illuminated?
No current; check
yes no
and replace fuse is
necessary and check
power supply.
Does the pump
start up in manual
operation?
yes
no
The adjusted tempe-
rature difference for
starting the pump is
too high; choose a
Is the pump current
value which makes
enabled by the cont-
more sense.
roller?
no
yes
Is the pump stuck?
Turn the pump shaft
using a screwdriver;
now passable?
Controller fuse o.k.?
Pump is defective -
yes replace it.
no
Controller is defec-
tive - replace it.
Replace the fuse.
34
Stores cool down at night.
Collector circuit
pump runs during the
night?
no yes
Collector tempera-
ture at night is higher
than the outdoor
temperature.
no yes
Sufficient store
insulation?
yes no
Insulation close
enough to the store?
yes no
yes
Are the store con-
nections insulated?
yes no
Warm water outflow
upwards?
no
no yes
a
a
Does the warm water
circulation run for a
very long time?
no
Check controller
Circulation pump
and blocking valve
should be switched
off for 1 night; less
store losses?
Check the non-
return valves in the
flow and the return
yes
pipe for functional
efficiency.
Check the non-
return valve in warm
water circulation - o.k.
Increase insulation.
yes
Replace insulation or The gravitation
increase it.
circulation in the
circulation line is
too strong; insert a
stronger valve in the
Insulate the connec-
non-return valve or an
tions.
electrical 2-port valve
behind the circulation
Change connection pump; the 2-port valve
is open when the
and let the water flow
sidewards or through pump is activated,
a siphon (down- otherwise it is closed;
connect pump
wards); less store
losses now? and 2-port valve
electrically in parallel;
no yes
activate the circulation
again. Deactivate pump
o.k.
speed control!
Use the circulation
pump with timer and
switch-off thermos-
yes
tat (energy efficient
circulation).
Check whether the
pumps of the afterhea-
ting circuit run at night;
check whether the
non-return valve is
defective; problem
no
solved?
no
Further pumps which
are connected to the
solar store must also
no
be checked.
Clean or replace it.