Cosmo Multi 3 Montage- Und Bedienungsanleitung Seite 177

16. TROUBLESHOOTING
Pump is overheated, but no heat transfer from the collector to the store, flow
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
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?
no yes
Plausibility control of the option
tube collector special function
Pump starts up very late.
Switch-on temperature differ-
ence DTOn too large?
no yes
Non-ideal position of the collec-
tor sensor (e.g. flatscrew sensor
instead of sensor in immersion
sleeves).
yes
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 calcified?
no yes
Heat exchanger blocked?
no yes
Heat exchanger too small?
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.
Clean dirt trap
Change DTOn and DTOff corre-
spondingly.
no o.k
Mount the collector sensor at
solar flow (warmest collector
output); use immersion sleeve of
the respective collector.
Change DTOn and DTOff corre-
spondingly.
Activate tube collector function
if necessary.
o.k.
Check / replace it
Decalcify it
Clean it
Replace with cor-
rectly sized one.
177