STIEBEL ELTRON SOM 9s - Manual (Page 99)

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SOM 9s
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 ∆Ton and ∆Toff
correspondingly.
Mount the collector sen-
sor at solar flow (war-
mest collector output);
use immersion sleeve of
the respective 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 /
changeover valve defec-
tive?
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 evacuated
tube collector function,
antifreeze function
Change ∆Ton and ∆Toff
correspondingly.
Switch-on temperature
difference ∆Ton to large?
Minimum limitation active
no yes
Wrong position of collector
sensors (e. g. flatscrew sen-
sor instead of sensor with
immersion sleeve)?
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 the system; increase
the system pressure to
at least static primary
pressure plus 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
Are valves or non-return
valves defective?
yes
Replace them
9.1 Miscellaneous
Activate evacuated tube
collector function if ne-
cessary. yes
o.k.
no