5 x Control unit operation
47
FA ROTEX Solaris - 08/2007
5.4 Recommended settings
5.4.1 Standard parameter values, recommended adjustment ranges
Table 5-3 summarises the default (factory) settings as well as possible and recommended adjustment ranges of the Solaris
system parameters.
The following notes will help to determine the optimum settings and guarantee an optimum heat yield with low power
consumption:
• Adjust the switch-on temperature difference "Delta T On" so that the system remains in operation under constant solar
radiation conditions and does not switch off immediately when the solar panel temperature drops due to heat removal. The
lower this value can be adjusted, the longer will be the operating periods with a correspondingly higher heat yield. If the
adjusted switch-on temperature difference is too low, the solar panel will already cool down so far during filling, that the
switch-off temperature difference is reached.
Î The pumps are switched off immediately, with resulting lower heat yield and higher power consumption.
• Adjust the switch-off temperature difference "Delta T Off" so that the heat yield obtainable at the switch-off point is higher
than the electrical power required to drive the pump.
Î As the pump power consumption is practically independent of the size of the connected solar panel array, but the
achievable heat yield is directly proportional to the number of solar panels, this parameter value must be set higher with
fewer solar panels and lower with more solar panels.
• Adjust the operating period "Time P2" of the booster pump P2 so that the entire cross-section of the feed pipe is filled with
water under all operating conditions. Determine the time required between sound of escaping air when the pumps are
switched on, and water entering the storage tank and add a safety margin of 20 seconds. The filling period depends on the
adjusted flow rate, the number of solar panels, system height and the length of the connection pipe.
• The max. storage tank temperature "TS max" is adjusted according to individual requirements. The higher the parameter
value, the higher the heat storage capacity available and therefore, the potential performance of the Solaris system.
System switch-on involving steam generation can often be disconcerting for the operator. Therefore, the switch-on inhibit
temperature "TK perm" has been factory-set to 95°C, which prevents boiling noises and escaping steam. The Solaris control
unit switches on the pumps again only when the solar panel temperature has fallen 2 Kelvin below the adjusted parameter value.
Consequently, the system starts gently, without evaporation in the solar panel. However, on a cloudless day, this can lead to a
situation where the system only switches on again in the late afternoon, although the storage tank temperature permits additional
heating.
• For maximum heat yield, the switch-on inhibit temperature should be adjusted to a value above 100°C, which disables the
inhibit function.
In this case, the operator must be informed that there will be considerably more boiling noise and steam during filling.
5.4.2 Other adjustments of your Solaris system
The following adjustment notes only apply for operation without a FlowSensor:
In this case, a FlowGuard (optional, 16 41 02) should be fitted to the feed coupling of the Sanicube Solaris storage
container. Hereby, the water flow should be adjusted so that the throughput of every solar panel is 90 to 120 l/h. Adjust the flow
rate either by selecting a speed range for pump P1 and/or by adjusting the FlowGuard regulating valve with flow indicator.
Reference values for the correct valve/pump settings are given in Table 5-5.
During commissioning, the system parameters must be adjusted individually to suit the installed system and
might need fine tuning during subsequent operation. Usually, the system will operate with the default settings.
CAUTION!
With storage tank temperatures above 60 °C, a thermal mixer valve must be fitted to the storage tank hot water
coupling to prevent scalding.
When operating the Solaris system with a FlowSensor, the flow in the solar circuit is adapted continuously to
the requirements by means of the temperature-difference dependent control of pump P1.
To Next Page
Loading...
Need help?
General
