Pump starts for a short moment, switches-on/off
again,etc.
Is the temperature diffe-
rence at the controller
too small?
no yes
Wrong position of the
collector sensor?
yes
Change∆Ton and ∆Toff
correspondingly.
Mount the collector sen-
sor at solar flow (warmest
collector output); 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 calcified?
yes
Check / replace it
Decalify it
no
Heat exchanger blocked?
yesno
Clean it
Heat exchanger too
small?
yes
Repalce with correctly
sized one
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 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 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 pres-
sure plus 0,5 bar; if neces-
sary 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
5.1Various:
Activate tube collector
function if necessary.
yes
o.k.
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