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742.114 | 14.50
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10.3.13 Freeze recirculation
Attempts to prevent freezing of the collectors by pumping heat from the
first-priority storage tank into the collectors:
• The collector temperature is below 40 °F: solar circuit pump is switched on.
• The collector temperature is above 45 °F: solar circuit pump is switched off.
The freeze recirculation function is only useful when the heat transfer
fluid contains insufficient or no anti-freeze. It is recommended to gener-
ally use heat transfer fluid with anti-freeze!
Notice
Despite the freeze recirculation function being activated, the solar en-
ergy system can freeze under the following conditions:
• The first-priority storage tank is unloaded and a back-up heating
system is not present.
• Heat transfer fluid contains insufficient or no anti-freeze.
• Power outage.
• Unsuitable position of the temperature sensor on the collector.
• Collector sensor or cable is broken or has a short circuit.
• The collectors are installed in a position exposed to the wind.
• Solar circuit pump is faulty.
Note
This function cannot be active at the same time as the drainback func-
tion.
Display Characteristic min. max.
Factory
setting
Activation on, oFF
oFF
10.3.14 Display storage tank top
Shows the temperature in the upper region of 1 or 2 storage tanks. For
this, an appropriate sensor must be connected to each tank. The meas-
ured temperatures are not used for control purposes.
Display Characteristic min. max.
Factory
setting
Activation on, oFF
oFF
Storage tank 1 upper sensor input 1 ... 5 –
Storage tank 2 upper sensor input
1)
1 ... 5 –
1)
Only for systems with 2 storage tanks
10.3.15 Alarm output
Activates the set output in the case of the following faults:
• Sensor fault due to short-circuit or interruption.
• Clock loses the current time due to an extended power outage.
• Volume flow fault: Er: 1
1)
.
• The electronic overload switch or fuse has triggered: Er: 3 ... Er: 6
1)
.
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