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SCU 123
Tanks cool down at night
Collector circuit pump
runs during the night?
no
yes
Collector temperature is
at night higher than the
outdoor temperature
no
yes
Sufficient tank insulation?
yes
no
Insulation close enough
to the tank?
yes
no
Are the tank connections
insulated?
yes
no
Warm water outflow
upwards?
no
yes
Does the warm water
circulation run for a very
long time?
no
yes
Circulation pump and
blocking valve should be
switched off for one night;
less tank losses?
yes
no
a
| 20
Check controller:
Manual operation active?
Tube collector function
active? Tank cooling
or antifreeze function
active?
Check the check valve in
the flow and the return
pipe with regard to the
functional efficiency.
Increase insulation.
Replace insulation or in-
crease it.
Insulate the connections.
Change connection and
let the water flow hori-
zontally or through a si-
phon (downwards); less
tank losses now ?
no
yes
o.k.
Use the circulation pump
with timer and switch-off
thermostat (energy effici-
ent circulation).
C h e c k w h e t h e r t h e
pumps of the backup he-
ating circuit run at night;
check whether the non-
return valve is defective;
problem solved ?
yes
no
o.k.
b
a
Control the non-return
valve in warm water cir-
culation - o.k.
yes
no
The thermosiphoning 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 - p o r t v a l ve i s o p e n
when the pump is activa-
ted, otherwise it is closed;
connect pump and 2-port
valve electrically in paral-
lel; activate the circulation
again
The solar circuit pump does not work, although the coll-
ector is considerably warmer than the tank.
Is the control lamp (LED)
illuminated?
yes
no
Does the pump start up
in manual operation?
no
yes
Is the pump current
enabled by the control-
ler?
no
yes
Are the controller fuses
o.k. ?
no
yes
Replace fuses.
b
Further pumps which are
connected to the solar
tank must also be che-
cked.
Clean or replace it
There is no current; check
fuses / replace them and
check power supply.
The adjusted temperature
difference 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 screwdriver; now pas-
sable?
no
Pump is defective - re-
place it
Controller might be de-
fective - replace it or
contact the distributor.
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