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InstallationIndications, functions and optionsMessages Commissioning Operation and function
Store cooling
OSTC
Store cooling option
Adjustment range: OFF / ON
Factory setting: OFF
OHOL
Holiday cooling option
Adjustment range: OFF / ON
Factory setting: OFF
THOL
Holiday cooling temperature
Adjustment range: 20 … 80 °C [70 … 175 °F]
Factory setting: 40 °C [110 °F]
When the store cooling function is activated, the controller aims to cool down the
store during the night in order to prepare it for solar loading on the following day.
If the adjusted maximum store temperature (S MX) is exceeded and the collector
temperature falls below the store temperature, the system will be reactivated in
order to cool down the store. Cooling will continue until the store temperature has
fallen below the adjusted maximum store temperature (S MX) again. A hysteresis of
2 K [4 °Ra] is set for the store cooling function.
Reference threshold temperature differences for the store cooling function are
DT O and DT F.
If no DHW consumption is expected for a longer period of time, the additional
holiday cooling option OHOL can be activated in order to extend the store cool-
ing function. The adjustable temperature THOL then replaces the maximum store
temperature (S MX) as the switch-off temperature for the store cooling function.
When the holiday cooling function is activated, ☼ and ⚠ (ashing) are shown on
the display.
If the holiday cooling function is active, ⓵, ☼ and ⚠ are displayed (ashing).
Collector minimum limitation
OCN
Collector minimum limitation option
Adjustment range: OFF / ON
Factory setting: OFF
CMN
Minimum collector temperature
Adjustment range:
10.0 … 90.0 °C [50.0 … 190.0 °F]
Factory setting: 10.0 °C [50.0 °F]
If the collector minimum limitation option is activated, the pump (R1 / R2) will only
be switched on, if the adjustable collector minimum temperature is exceeded. The
minimum temperature prevents the pump from being switched on too often at low
collector temperatures. A hysteresis of 5 K [10 °Ra] is set for this function. If the
collector minimum limitation is active, ❄ is displayed (ashing).
Note
If OSTC or OCF is active, the collector minimum limitation will be over-
ridden. In that case, the collector temperature may fall below CMN.
Antifreeze function
OCF
Antifreeze function option
Adjustment range: OFF / ON
Factory setting: OFF
CFR
Antifreeze temperature
Adjustment range:
-40.0 … +10.0 °C [-40.0 … +50.0 °F]
Factory setting: +4.0 °C [+40.0 °F]
The antifreeze function activates the loading circuit between the collector and the
store when the temperature falls below the adjusted antifreeze temperature. This
will protect the uid against freezing or coagulating. If the adjusted antifreeze tem-
perature is exceeded by 1 K [2 °Ra], the loading circuit will be deactivated.
If the antifreeze function is activated, ❄ is displayed. If the antifreeze function is
active, ⓵ and ❄ are displayed (ashing).
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General