Resol DeltaSol AL E, Manual For The Specialised Craftsman, Page: 34 / 92

en
34
The solar circuit pump does not work, although
the collector is considerably warmer than the
store.
Operating control
lamp of the controller
illuminated?
yes
no
Does the pump
start up in manual
operation?
yes
The adjusted tempe-
rature difference for
starting the pump is
too high; choose a
value which makes
more sense.
no
Is the pump current
enabled by the cont-
roller?
yes
Is the pump stuck?
Turn the pump shaft
using a screwdriver;
now passable?
No current; check
and replace fuse is
necessary and check
power supply.
Pump is defective -
replace it.
Controller fuse o.k.?
Controller is defec-
tive - replace it.
no
yes
no
no
yes
Replace the fuse.
Stores cool down at night.
Collector circuit
pump runs during the
night?
no yes
Check controller
Collector tempera-
ture at night is higher
than the outdoor
temperature.
no yes
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?
yes no
Replace insulation or
increase it.
Are the store con-
nections insulated?
yes no
Insulate the connec-
tions.
Warm water outflow
upwards?
no yes
Change connection
and let the water flow
sidewards or through
a siphon (down-
wards); less store
losses now?
no yes
o.k.
a
Does the warm water
circulation run for a
very long time?
no yes
Use the circulation
pump with timer and
switch-off thermos-
tat (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 afterhea-
ting circuit run at night;
check whether the
non-return valve is
defective; problem
solved?
no
Check the non-
return valve in warm
water circulation - o.k.
yes no
Further pumps which
are connected 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.