Siemens RVA53.242 - 5.18 Minimum limitation of the boiler return temperature; 5.19 Switching differential of bypass pump

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Siemens Building Technologies Basic Documentation RVA63.242, RVA53.242 CE1P2373E
Landis & Staefa Division Description of OEM settings 26.03.2001
5.18 Minimum limitation of the boiler return
temperature
Control of the boiler return temperature.
Minimum limitation of the boiler return temperature is a protective function for the boiler.
It avoids flue gas condensation by preventing the boiler return temperature from falling
below a certain level. The function acts in conjunction with maintained boiler return
temperature.
Setting range Unit Factory setting
8...95 °C 8
Minimum limitation ensures that the boiler return temperature will not fall below a
certain level.
Increase: Higher return temperatures
Decrease: Lower return temperatures
5.19 Switching differential of bypass pump
Optimum control of the boiler bypass pump.
Control of the bypass pump is in the form of 2-position control for which a switching
differential must be set.
The function is active only when controlling the bypass pump according to the boiler
return temperature! Also refer to "control of the bypass pump" in Index.
Setting range Unit Factory setting
0...20 °C (K) 6
2-position control provides mixing by the bypass pump in the form of pulses. The extent
of mixing is dependent on the mass and the amount of water in the boiler circuit.
Benefit
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Benefit
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