5 x Control unit operation
39
FA ROTEX Solaris - 08/2007
The pumps are switched off if:
– The temperature difference of the adjusted parameter value "Delta T Off" is exceeded (e.g. return flow temperature is
45°C and "Delta T Off" is 2 K; Solaris feed temperature <47°C).
– The maximum storage tank temperature set via the "TS max" parameter is reached (T
S
light flashes). In this case, the
pumps can only be switched on again, if the storage tank temperature drops by more than 2 K.
5.2.2 Booster function for high solar panel temperatures
In addition to the standard circulation pump P1, the booster pump P2 is switched on automatically at a solar panel temperature
of "TK max" = 70°C (booster temperature).
– This increases the system pressure as well as the flow quantity, which enables more heat to be stored within a shorter time.
A heating expert can change the booster temperature by means of the parameter "TK max". As soon as the solar panel
temperature drops more than 5 K below "TK max", pump P2 is switched off automatically.
5.2.3 Switch-on inhibit function
This function (which can be disabled) prevents:
– restart, if Solaris the system it has been switched off automatically because the adjusted max. storage tank temperature
"TS max" has been reached.
– pump operation, if the solar panel temperature exceeds the max. permissible value (the parameter "TK perm" is adjustable
by a heating expert).
In case of continuous solar radiation, solar panel temperatures above 100°C are possible after the pumps have been switched
off. If, in such a situation, the storage tank temperature drops below the release temperature ("TS max" – 2 K), for example
because domestic hot water is consumed, the pumps are switched on again, provided that the solar panel temperature has also
dropped 2 K below the max. permissible temperature "TK perm". When this happens, the T
K
light flashes.
With solar panel temperatures above 100°C, the return flow water evaporates immediately as soon as it enters the solar panel.
In a correctly installed Solaris system, the steam escapes into the storage tank, where most of it condenses again. It is possible
that a reduction of the excess heating capacity in the solar panels and the associated boiling noise will take several minutes.
Similarly, a slightly increased consumption of tank water due to escaping steam is a normal operating state.
5.2.4 Pump kick function
This is a protective function for the pumps in case of longer bad weather periods or after a standstill of more than 24 hours.
– Both pumps P1 and P2 are switched on for a short period to prevent them stopping.
5.2.5 Manual operation
Only for commissioning or for testing, the system can be switched to manual operation for a max. period of 30 minutes. Hereby,
all control functions are disabled and both pumps run continuously with the adjusted output, regardless of the system
temperatures.
• Manual operation is toggled on/off by pressing both arrow keys simultaneously (>1 s).
Without an installed FlowSensor, or if it is defective, circulation pump P1 is operated constantly with the
adjusted output (no speed control). The pumps are controlled exclusively via the difference between solar panel
and Solaris return flow temperatures.
If pump P1 is operated without a FlowSensor, pump P2 is switched on every two hours for a period that is
adjusted with parameter "Time P2".
CAUTION!
Uncontrolled manual operation can result in heat loss, excessively high storage tank temperatures and even
frost damage in extremely cold situations.
To Next Page
Loading...
Need help?
General
