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ASC02-01WM
max
NOTE
EN2B-0365GE51 R0710
7.3
Maximum collector temperature
During periods of high solar irradiance, the temperature (T1) of
the heat transfer fluid can exceed 130 °C. The heat transfer fluid
evaporates. In this case, the pump is blocked for protection
purposes until the temperature drops below 127 °C.
The following display appears:
C
•
The display flashes "max"
•
The display only shows "max" when temperature sensor T1 is
also selected.
7.4
Tube collector function (F1)
Due to its construction, the collector temperature (T1) can only be
inaccurately recorded with vacuum tube collectors (in some cases
there are no immersion sensors; the sensor is outside the
collector pipe). In these cases, the solar circuit must be briefly
activated at regular intervals to transmit the actual heat from the
collector pipe to the sensor (T1). If the tube collector function is
activated, the controller automatically switches the pump on every
30 minutes for 30 seconds.
7.5
Anti-freeze function (F2)
If the anti-freeze function is activated, the controller switches the
pump on as soon as the collector temperature T1 falls below
+5 °C. The heat transfer fluid is thus pumped through the collector
and tries to prevent refreezing. If the collector reaches a
temperature of +7 °C, the pump is switched off again.
CAUTION
System can freeze despite the activated anti-freeze function!
During a power outage (the anti-freeze function does not
operate).
During long-term periods of frost (due to restricted water
tank heat storage).
If collectors are mounted in locations exposed to wind.
► It is recommended to generally use the heat carrier fluid with
antifreeze for Solar Plants.
Description of the controller functions
23
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