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CMN: Minimum collector temperature
Setting range: 10 ... 90 °C
Default setting: 10 °C
If the OCF parameter is set ON, the minimum collector tempera-
ture limit is activated for the associated collector.
Minimum collector temperature is the minimum temperature
threshold that must be exceeded before the solar circuit pump
(relay R1) can be activated. The minimum temperature setting
prevents the solar pump being switched on too frequently at
low collector temperatures.
By default, minimum temperature is set at 10 °C, and the func-
tion is deactivated. A hysteresis of 5K is set for this function. If
temperature falls below the minimum setting, the symbol
flashes on the display.
19.10 Option: frost protection function
OKF: Frost protection function
Setting range: ON, OFF
Default setting: OFF
CFR: Frost protection temperature
Setting range: -40,0 ... +10,0 °C
Default setting: 4,0 °C
If the OKF parameter is set ON, the frost protection function is
activated for the collector associated with that parameter. The
frost protection function activates the heating circuit between
the collector and the storage heater to prevent ice forming in the
pipes or in the collector.
Activation starts when a temperature below the set frost protec-
tion temperature is reached. If the temperature set in the frost
protection parameter is exceeded by 1 °C, the solar circuit is de-
activated.
Note! This frost protection function only uses the thermal energy
stored in the storage heater or buffer tank. For this reason it
should only be relied on in regions where outdoor temperatures
fall below 0 °C for only a few days a year.
19.11 Storage cylinder cooling function
OSTC: Storage cylinder cooling function
Setting range: ON, OFF
Default setting: OFF
OHOL: Holiday cooling
Setting range: ON, OFF
Default setting: OFF
THOL: Holiday cooling temperature
Setting range: 20 ... 80 °C
Default setting: 40 °C
If the storage cylinder cooling function is activated, the control-
ler attempts to cool the storage cylinder during the night ready
for charging the next day.
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