Operation manual of solar controller SR658
Page 100 of 105
Pump starts for a short time and switches off, and then switches on again, etc.
Temperature difference at the controller
too small?
No
Yes
Change
ΔTon
and
ΔToff
correspondingly.
Possibility to activate the tube collector
function with you controller?
Mount the collector sensor at
solar flow (warmest collector
output); use immersion sleeve
of the respective collector.
Wrong position of collector sensors?
No
Yes
No
OK
Pump starts up very late.
Switch-on temperature difference
ΔTon too large?
No
Yes
Change
ΔTon and ΔToff
correspondingly.
Activate tube collector function
if necessary.
Non-ideal position of the collector sensor
(e. g. flat screw sensor instead of sensor
in immersion sleeves).
Yes
O.K
The temperature difference between tank and collector increases enormously
during operation, the collector circuit cannot dissipate the heat.
Collector circuit pump defective?
No
Yes
Check / replace it
Decalcify it
Heat exchanger calcified?
No
Yes
Heat exchanger blocked?
Heat exchanger too small?
Clean it
No
Yes
Replace it with correct sized.
Yes
