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Potterton Solar - Solar Thermal Domestic Hot Water System 19
3.2.2 Flow monitoring
If the energy productivity measurement option is
deactivated, the temperature difference between
collector and storage tank is checked.
If it exceeds the amount of (60K + dTmax), it is then
interpreted as an error because in the case of normal
system dimensioning and a pump switched on such large
differences cannot take place.
I
f the energy productivity measurement option is
activated, the flow amount when the pump is switched
on is checked. If for 15 minutes no flow is recognised
it is evaluated as an error.
E
rror message is automatically reset after eliminating
the failure.
3.2.3 Collector protection / Re-cooling
This function can be switched on/off in the “Basic settings”
menu.
High temperatures can destroy antifreeze liquids.Therefore,
the maximum collector temperature should be restricted.
When all storages have been loaded to the limit, the solar
pump is switched off. If the collector temperature rises
above “T collector max”, the solar pump is switched on,
until the collector temperature drops by 10K. Part of the
energy is lost in the pipes, the rest is loaded in the storage,
which results in increasing the storage temperature above
the adjusted maximum storage temperature. For security
reasons the function will be interrupted if the storage
reaches 95ºC.
If the storage temperature is bigger TStmax+2K and the
collector temperature is 10K below TSt, then the re-cooling
function is activated.The redundant storage energy will be
released through the collector in order to assure reserves
for the next loading cycle.
The re-cooling ends when TSt drops below the value “re-
cooling till…” in the “Basic settings” menu, point 3, or
when the collector temperature >= the storage
temperature – 2K.
The re-cooling function can be active only when the
collector protection function is on.
3.2.4 System protection function
The system protection function switches the system off if
the “maximum collector temperature” is exceeded by 10K.
As soon as the temperature drops below the “maximum
collector temperature”, the system is started up again.This
function has higher priority and is always active, regardless
of whether the collector protection is on or off.
“Basic SETTINGS” “Programming”
0 -- 1 ---
1 -- 120ºC
2 -- 1
3 -- 40ºC
Corresponding values in menu
Indication Meaning
+
Missing circulation in solar circuit
!