Steca TR A301 - Description of the controller functions; 7.1 Switch-on; switch-off temperature difference

20
738.955 | 10.40
EN
7 Description of the controller
functions
7.1 Switch-on / switch-off temperature dif-
ference
The controller constantly compares the temperatures
between the collector (T1) and the lower area of the
stor
age tank (T2). As soon as the temperature in the
collector (T1) is 8 K (constant fixed value) higher than
the temperature in the storage tank (T2), the following
display appears:
The sun symbol is displayed
If no safety limits prohibit the pump from operating,
the PWM control signal for the pump appears at out-
put C. The display shows this message.
The pump symbol rotates
If the temperature difference falls below 4 K (constant
fixed value), the PWM control signal for the pump at
output C is switched off. The sun symbol is no longer
shown on the display.
NOTE
The power supply for the ECM pump at output R1
always remains switched on. The ECM pump is control-
led exclusively by the PWM control signal at output C.
7.2 Maximum stor
age tank temperature
The maximum storage tank temperature function is to
prevent the hot water tank from overheating. If the
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T2T2
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