DeltaSol
®
AL
|
16
© RESOL 10341 deltasol_al.mon
us.ind
d
Tanks cool down at night.
Does the collector
circuit pump run during
the night?
no
yes
Check controller.
At night, the collector
temperature is higher
than the outdoor tem-
perature.
no
yes
Check the non-return
valve in flow and return
pipe with regard to the
functional efficiency.
Sufficient tank insulation?
yes
no
Increase insulation.
Insulation close enough
to the tank?
yes
no
Replace insulation or in-
crease it.
Are the tank connections
insulated?
yes
no
Insulate the connections.
Warm water flows
upwards?
no
yes
Change connection and
let the water flow side-
wards or through a siphon
(bow downwards); less
tank losses now?
Does warm water circu-
lation run for a very long
time?
no
yes
Use the circulation pump
with timer and switch-off
thermostat (energy effi-
cient circulation)
The solar circuit pump does not run although the collector
is significantly warmer than the tank.
Does the operating con-
trol lamp flash?
yes
no
Does the pump start up
in manual operation?
yes
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.
no
Is the pump current re-
leased by the controller?
yes
Is the pump stuck?
Turn the pump shaft using
a screwdriver; now pas-
sable?
Pump is defective - re-
place it
Are the controller fuses
o.k.?
Controller might be de-
fective - replace it.
no
yes
no
no
yes
Replace the fuses.
Circulation pump and
blocking valve should be
switched off for one night;
less tank losses?
yes
no
Check whether the pumps
of the after-heating cir-
cuit runs at night, check
non-return valve; problem
solved?
no
no
yes
o.k.
Check the non-return
valve in warm water cir-
culation – o.k.?
yes
no
Further pumps which are
connected to the solar
tank must also be che-
cked.
The gravity circu lation in
the circulation line is too
strong; insert a stronger
valve in the non-return
valve or an electric 2-port
valve behind the circula-
tion pump; in pump ope-
ration, the 2-port valve
is open, other wise it is
closed, conect pump and
2-port valve in parallel;
activate circulation again!
Clean or replace
a
a
b
b