5 x Control unit operation
41
FA ROTEX Solaris - 08/2007
Fig. 5-3 Example of modulated control with disabling of lower pump output stages after detection of a flow interruption
5.2.9 Overall reset function
The controller responds to an overall reset with a new start (self-test), whereby all parameters are set to their default (factory)
values and all disabled pump output stages are enabled. A reset is carried out by:
• Simultaneously pressing the OK and arrow keys.
5.2.10 Frost protection function
In case of low outdoor temperatures, the Solaris system is started only if the operating conditions for a factory-defined frost
protection temperature of 25°C ("TR frost") for the return flow are fulfilled. If the measured return flow temperature is below
the frost protection value ("TR frost"), the pumps are operated at least for the period defined in parameter "Time P2", even if
the switch-off temperature condition has already occurred. This prevents the build-up of ice in the connection pipe.
5.2.11 System leakage protection function
If no minimum flow V1 is detected by the Flow Sensor (according to Fig. 5-3) after switch-on or after the max. starting period
("Time P2") for pumps P1 and P2 has elapsed, the reason can be:
– a defect of the FlowSensor, or
– a leak in the Solaris system.
To prevent all the stored water from being pumped out of the system in case of a leak, both pumps are switched off permanently
and the error message "F" appears in the left-hand column of the display.
• Replace the defective FlowSensor or repair the leak.
• Restart the system in the manual operating mode.
t Time
V Solar circuit flow
A Start phase
B Operating phase (modulation)
C Interrupted flow
D Low pump output stages are automatically
disabled when flow is interrupted
V1 Minimum flow in start phase ("VS min")
V2 Minimum flow in operating phase ("S flow")
t
1 Maximum starting time of booster pump P2
("Time P2")
t
2 Stabilisation period ("S time")
t
3 Interruption detection period (10 s)
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