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26
Tips for fault localization
Does collector
circuit pump run
during the night?
no
yes
Check the controller
functions
Collector tempe-
rature is at night
higher than ambient
temperature.
no
yes
Check the return fl ow
preventer in feed
fl ow and return fl ow
with regard to the
functional effi ciency.
Warm water outfl ow
upwards?
no
yes
Change connection
and let the water
flow sidewards or
through a siphon
(bow downwards);
less store losses
now?
Does warm water
circulation run for a
very long time?
no
yes
Use the circulation
pump with timer
and switch-off ther-
mostat (energy effi -
cient circulation)
Does the pump start
up in manual opera-
tion?
yes
The adjusted tempe-
rature difference for
starting the pump is
too high; choose a
value which makes
more sense.
no
Is the current of the
pump released by
the controller?
yes
Is the pump stuck?
Start the pump shaft
up by a screwdriver;
is it ready for opera-
tion now?
Is the pump defec-
tive - replace it.
Are the fuses of the
controller o.k.?
Controller seems to
be defective - re-
place it.
no
yes
no
no
yes
Replace the fuses.
Switch-off the circu-
lation pump and the
blocking valves for
1 night; less store
losses?
yes
no
Make sure that the
pumps of the after-
heating circuit are not
in nightly use and that
the return fl ow inhibi-
tor is faultless; pro-
blem solved?
no
no
yes
o.k.
Control the return
flow preventer in
warm water circu-
lation - o.k.
yes
no
Please also check
further pumps which
are connected to the
solar store.
Clean or replace.
Stores are cooled during the night.
The solar circuit pump does not work although
the collector is obviously warmer than the
store.
The gravitation circu lation in the circulation line
is too strong; insert a stronger return fl ow pre-
venter or an electrical 2-way valve behind the
circulation pump; the 2-way valve is open in
pump operation, other wise it is closed, conect
pump and 2-way valve in parallel; activate the
circulation again!
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