Minimum Limitation Of The Boiler Return Temperature; Switching Differential Of Bypass Pump - Siemens RVA63.242 User Manual

Benefit
Description
Setting
Effect
Benefit
Description
Note
Setting
Effect
164/218
Siemens Building Technologies
Landis & Staefa Division
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
8...95
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
0...20
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.
Basic Documentation RVA63.242, RVA53.242
Description of OEM settings
Unit
°C
Unit
°C (K)
Factory setting
8
Factory setting
6
CE1P2373E
26.03.2001