Pump starts for a short moment, switches-off, switches-on
again, etc.
Temperature difference
at the controller too
small?
no
yes
Wrong position of collec-
tor sensors?
yes
Change
D
Ton and
D
Toff
correspondingly
Mount the collector sen-
sor at solar flow (warmest
collector output); use im-
mersion sleeve of the re-
spective collector.
Pump starts up very late
The temperature diffrence between tank and collector in-
creases enormously during operation; the collector circuit
cannot dissipate the heat.
Collector circuit pump
defective?
no
yes
Heat exchanger calcified?
yes
Check / replace it
Decalcify it
no
Heat exchanger blocked?
yes
no
Clean it
Heat exchanger too
small?
yes
Replace with correctly
sized one
no
Plausibility control of
the option tube collec-
tor special function
Change
D
Ton and
D
Toff
correspondingly
Switch-on temperature
difference
D
Ton to large?
no
yes
Non-ideal position of the coll-
ector sensor (e.g. flatscrew
sensor instead of sensor in
immersion sleeves)?
o.k.
no
Pump is overheated, but no heat transfer from the colle-
ctor to the tank, flow and return have the same tempera-
ture; perhaps also bubble in the lines.
Air in the system; in crease
the system pressure to at
least static primary pres-
sure plus 7. 25 psi (0,5 bar);
if necessary continue to
increase pressure; switch
the pump off and on for a
short time.
Air in the system?
no
yes
Is the collector circuit
blocked at the dirt trap?
yes
Clean the dirt trap
Activate tube collector
function if necessary
yes
o.k.
D e lt a S o l
®
E
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