5
x
Control unit operation
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FA ROTEX Solaris RPS3 25M - 03/2010
5.2.3 Switch-on inhibit functions
The switch-on inhibit functions prevent:
– switching on again if the Solaris installation has been switched off automatically (T
S
light flashes) because the maximum
temperature set for the storage tank, "T
S
max", has been reached.
– operation of the pumps if the collector temperature exceeds the value set by the heating engineer with the "T
K
perm" param-
eter (T
K
light flashes).
If the solar radiation continues after the pump(s) have been switched off due to the maximum storage tank temperature being
reached, solar panel temperatures of over 100 °C are possible. If, in such a situation, the storage tank temperature drops below
the enable temperature ("T
S
max" – 2 K), (e. g. because domestic hot water is consumed), the circulation pump and, if installed,
the booster pump, are switched on again provided that the solar panel temperature has dropped 2 K below the restart protection
temperature set with parameter "T
K
perm"
The function inhibit time prevents the pump(s) from being enabled again after a switch-off condition before the inhibit time
(0 – 600 s) set under parameter "Time SP" has elapsed.
This means:
– cycling of the system can be minimised.
– the collector can reach a higher temperature.
– the feed temperature does not fall below the switch-off condition when the system is filled.
5.2.4 Pump kick function
The pump kick is a pump protection function for longer periods of bad weather. It is active once after each 24-hour period of
standstill.
The circulation pump and, where installed, the booster pump, are switched on briefly, for a few milliseconds, thus pre-
venting pump seizure.
5.2.5 Manual operation
The installation can be switched on manually for the time stored under the "H/A" parameter for commissioning and test purposes.
This switches off all control functions, and the pump(s) run(s) continuously, independent of the system temperatures, at the set
ouput stage.
•
Manual operation is toggled on/off by pressing both arrow keys simultaneously (>1 s).
If the circulation pump and, where installed, the booster pump, are switched on at solar panel temperatures of
over 100 °C (T
K
perm > 100 °C), the return water evaporates immediately after reaching the solar panel.
The reduction of the excess heating capacity in the collectors and the associated boiling noise caused by evap-
oration can last several minutes.
In a correctly installed Solaris system, the steam escapes into the storage tank, where most of it condenses
again. Similarly, a slightly increased consumption of cylinder water due to escaping steam is a normal operating
condition.
Only with optional booster pump installed:
If circulation pump P1 operates alone without a FlowSensor and without any switch-off condition or booster
function occurring, the booster pump P2 is switched on every two hours for the time specified in the "Time P2"
parameter.
This prevents damage to circulation pump P1 should an undetected break in the flow occur.
CAUTION!
Uncontrolled manual operation can result in heat loss, excessively high storage tanks temperatures, and even
frost damage in extremely cold situations.
