SHR
521 20
© Dra
yton
06
334
SHR 521
20
.monen.
ind
d
19
|
Stores are cooled during the night.
Does collector circuit
pump run during the
night?
no
yes
Check the controller
functions correctly
Collector temperature is
at night higher than ambi-
ent temperature.
no
yes
Check the return flow
preventer in feed flow and
return flow for functional
efficiency.
Is store insulation suffi-
cient?
yes
no
Increase the insulation.
Is store insulation close
enough to the store?
yes
no
Replace or intensify the
insulation.
Are the store connec-
tions 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
store 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 store.
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 selected temperature
difference for starting the
pump is too high; choose
suitable setting
no
Is the flow of the pump
seen by the controller?
yes
Is the pump stuck?
Put the pump into operati-
on by means of a screwdri-
ver; is there flow 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 store
losses?
yes
no
Check the pumps of the
backup 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 store.
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,
connect pump and 2-way
Cleaning or replacement.
valve in parallel; activate
the circulation again!
a
a
b
b
