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Collector excess temperature CET
Steam occurs in the system during standstill. When the system automatically switches on
again, the pump does not have enough pressure to raise the fluid level above the highest
point in the system (collector supply line). This represents a considerable load on the pump
when there is no circulation. This function allows the pump to be blocked whenever the col-
lector reaches a certain temperature (max ) until a second settable threshold (max ) has
been crossed.
ON / OFF Collector excess temperature limit ON/OFF (ex works = ON)
max Temperature above which the outputs set are to be blocked
(ex works = 130°C)
Setting range: +1°C to +200°C in increments of 1°C
max Temperature above which the outputs set are to be released.
(ex works = 110°C)
Setting range: 0°C to +199°C in increments of 1°C
Collector anti-freeze FROST
In the south, a minimum temperature in the collector can bridge the few hours near freezing
using energy from the tank. The settings in the chart cause the solar pump to be released
when the threshold min of 2°C is exceeded at the collector sensor and blocked again
when the threshold min of 4°C is surpassed. If the control output is allocated to the out-
put, then analog step 100 is additionally output at this control output.
ON / OFF Frost-protection function ON/OFF (ex works = OFF)
min Temperature above which the outputs set are to be switched on (ex works = 2°C)
Setting range: -30°C to +149°C in increments of 1°C
min Temperature above which the outputs set are to be switched off (ex works = 4°C)
Setting range: -29°C to +150°C in increments of 1°C
NOTICE: If the frost protection function is activated and an error occurs at the set collector
sensor (short circuit, interruption), the set output is switched on at the top of every
hour for 2 minutes.
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