Pump is overheated, but no heat transfer from the collector to the store, ow
and return have the same temperature; perhaps also bubbling in the lines.
Air or gas bubbles in the system?
no yes
Is the collector circuit blocked at
the dirt trap?
yes
Clean dirt trap
Pump starts for a short moment, switches off, switches on again, etc.
Temperature difference at the
controller too small?
no yes
Wrong position of collector
sensors?
yes
Change ∆Ton and ∆Toff corre-
spondingly.
Mount the collector sensor at solar
ow (warmest collector output);
use immersion sleeve of the respec-
tive collector.
no
no
o.k.
Pump starts up very late.
The temperature difference between store and collector increases enor-
mously during operation; the collector circuit cannot dissipate the heat.
Collector circuit pump defective?
no
yes
Heat exchanger calcied?
yes
Check / replace it
Decalcify it
no
Heat exchanger blocked?
yes
no
Clean it
Heat exchanger too small?
yes
Change ∆Ton and ∆Toff corre-
spondingly.
Switch-on temperature difference
∆Ton too large?
no yes
Vent the system; increase the
system pressure to a static primary
pressure of at least plus 0.5 bar;
if necessary continue to increase
pressure; switch the pump on and
off for a short time.
Plausibility control of the option
tube collector special function
Replace with correctly
sized one.
Non-ideal position of the collector
sensor (e. g. atscrew sensor instead
of sensor in immersion sleeves).
yes
Activate tube collector function if
necessary.
o.k.
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