5 x Operation
40
FA ROTEX Solaris RPS3 P2 - 06/2012
Table 5-6 Setting the flow at the FlowGuard (FLG)
5.4.3 Recommended setting for supplementary heating with external heat sources or the electric
immersion heater, burner inhibit contact
For the greatest potential output:
• do not heat the hot water storage tank frequently with the external heat source or the electric immersion heater, and then
only to an adequate temperature.
• use timer programmes to calculate optimised times for "normal usage" by regular consumption habits.
• enable supplementary heating for 1/2 to 2 hours before usual usage time depending on the external source.
• limit supplementary heating to prevent the storage tank from being directly heated after a normal usage cycle.
• If greater volumes of hot water are used and to maintain comfortable temperatures during periods of unusual use, set the
temperature in the hot water zone to a sufficiently high level or enable the heat generator for supplementary heating, e.g. by
switching to a different timer programme.
Heating with an external heat generator
Depending on the heat requirements (depending on the building insulation, outside temperature and target room temperature) and
the installed area of solar panels, it is worth disabling heating by an external heat generator by connection of the burner inhibit
contact. To do this, even if the heating control generates a heat requirement:
• Set the operating parameter "P min", "T
S
min" and "VBSK" (see chapter 5.3.9) so the external heat generator does not heat,
– if the solar panels generate a minimum heat output or
– the storage tank has reached a sufficiently high temperature.
Number of
collectors
Nominal flow
in l/min
Nominal flow
in l/h
Solar panel circuit Storage tank circuit Solar panel circuit Storage tank circuit
2 3.6 to 4.8 3.0 to 4.0 220 to 290 180 to 240
3 5.4 to 7.2 4.5 to 6.0 330 to 435 270 to 360
4 7.2 to 9.6 6.0 to 8.0 435 to 580 360 to 480
5 9 to 12 7.5 to 10.0 540 to 720 450 to 600
Even if the flow volume is set correctly, the cut-in temperature difference "Delta T on" and good weather
conditions will occasionally shut down the solar system. With the sun rising or setting and an increasing
storage tank temperature the solar panel temperature will fall slowly after starting the pumps, the cut-out
condition will be reached. The continuing solar radiation will increase the temperature of the solar panels, the
pumps will operate and the system will cycle because the solar radiation is no longer sufficient for continuous
operation. The FlowSensor reduces this effect by controlling the pump speed.
The optimum heating temperature depends on the personal requirements, commonly 50 °C tank temperature
is sufficient. A shower requires an average of 30 to 50 l of hot water with a tap temperature of 40 °C. The
cold water flowing into the tank during the shower must be heated in the hot water storage tank by the
continuous heating principle.
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