44
Pump starts for a short moment, switches-on/off
again,etc.
Is the temperature dif-
ference at the control-
ler too small?
no yes
Wrong position of the
collector sensor?
yes
Change∆Ton and ∆Toff
correspondingly.
Mount the collector
sensor at solar flow
(warmest collector out-
put); use the immersion
sleeve of the respective
collector.
Pump starts up very late.
The temperature difference between the store and
the collector increases enormously during operation;
the collector circuit cannot divert the heat.
Collector circuit pump
defective ?
no yes
Heat exchanger calci-
fied?
yes
Check / replace it
Decalify it
no
Heat exchanger blo-
cked?
yesno
no
Plausibility control of the
tube collector function
Change∆Ton and ∆Toff
correspondingly
Switch-on-temperature
difference ∆Ton too
large?
no yes
Non-ideal position of colle-
ctor 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 store, flow and return have the same
tempe- rature; perhaps also bubble in the lines
Vent the system; in-
crease system pressure
to at least static primary
pressure plus 0,5 bar; if
necessary increase the
pressure, switch the
pump on and off for a
short time
Air in the system?
no yes
Is the collector circuit
blocked at the dirt trap?
yes
Clean the dirt trap
4.1 Various:
Activate tube collector
function if necessary.
yes
o.k.
4. Troubleshooting
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