USDT 3002
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Tanks are cooled during the night.
Does collector circuit
pump run during the
night?
no
yes
Check the controller
functions
Collector temperature is
at night higher than ambi-
ent temperature.
no
yes
Check the return flow
preventer in feed flow and
return flow with regard to
the functional efficiency.
Is tank insulation suffi-
cient?
yes
no
Intensify the insulation.
Is tank insulation close
enough to the tank?
yes
no
Replace or intensify the
insulation.
Are the tank connections
insulated?
yes
no
Insulate connections.
Warm water outflow
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 work although the coll-
ector is obviously warmer than the tank.
Does the control LED
flash?
yes
no
Does the pump start up
in manual operation?
yes
There is no current; check
fuses / replace them and
check power supply.
The adjusted temperature
difference for starting the
pump is too high; choose
an matching setting
no
Is the current of the
pump released by the
controller?
yes
Is the pump stuck?
Put the pump into operati-
on by means of a screwdri-
ver; is it passable now ?
Is the pump defective -
replace it.
Are the fuses of the
controller o.k.?
Controller seems to be
defective - replace it.
no
yes
no
no
yes
Replace the fuses.
Switch-off the circulation
pump and the blocking
valve for 1 night; less tank
losses?
yes
no
Check the pumps of the
after-heating circuit ac-
cording to nightly run and
defect return flow preven-
ter; problem solved?
no
no
yes
o.k.
Control the return flow
preventer in warm water
circulation- o.k.
yes
no
Please also check further
pumps which are connec-
ted to the solar tank.
The gravitation circulation
in the circulation line is
too strong; insert a stron-
ger return flow preventer
or an electrical 2-way val-
ve behind the circulation
pump; the 2-way valve is
open in pump operati-
on, otherwise it is closed,
conect pump and 2-way
Cleaning or replacement.
valve in parallel; activate
the circulation again!
a
a
b
b
