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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
storage tank (T
). As soon as the temperature in the
collector (T1) is 8 K (constant fixed value) higher than
the temperature in the storage tank (T
), 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
storage
tank
temperature
The maximum storage tank temperature function is to
prevent the hot water tank from overheating. If the
•
•
T2
T2
Содержание TR A301
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