Resol DeltaSol CS Plus bidirectional Manual For The Specialised Craftsman page 68

Stores cool down at night.
Collector circuit pump runs during
the night?
no yes
Collector temperature at night is
higher than the outdoor temperature.
no yes
Sufficient store insulation?
yes no
Insulation close enough to the
store?
yes no
Are the store connections insulated?
yes no
Warm water outflow upwards?
no yes
Does the DHW circulation run for
a very long time?
no yes
Circulation pump and blocking valve
should be switched off for 1 night; less
store losses?
yes no
a
68
Check controller
Check the non-return valves in
the flow and the return pipe for
functional efficiency.
Increase insulation.
Replace insulation or increase it.
Insulate the connections.
Change connection and let the
water flow sidewards or through
a siphon (downwards); less store
losses now?
no yes
o.k.
Use the circulation pump with
timer and switch-off thermostat
(energy-efficient circulation).
Check whether the pumps of the
after-heating circuit run at night;
check whether the non-return valve
is defective; problem solved?
no
b
a
Check the non-return valve in
warm water circulation - o.k.
yes no
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
The solar circuit pump does not work, although the collector is considerably
warmer than the store.
Is the display working?
yes no
Does the pump start up in manual
operation?
no yes
Is the pump current enabled by the
controller?
no yes
Controller fuse ok?
no yes
Replace fuse
b
Further pumps which are connect-
ed to the solar store must also be
checked.
Clean or replace it.
is activated, otherwise it is closed;
connect pump and 2-port valve
electrically in parallel; activate the
circulation again. Deactivate pump
speed control!
There is no current; check fuses /
replace them and check power
supply.
The adjusted temperature differ-
ence for starting the pump is to
high; choose a value which makes
more sense.
Is the pump stuck?
yes
Turn the pump shaft using a screw-
driver; now passable?
no
Pump is defective - replace it.
Controller might be defective -
replace it.