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Siemens Building Technologies Basic Documentation RVA63.242, RVA53.242 CE1P2373E
Landis & Staefa Division Description of heating engineer settings 26.03.2001
4.30.1 Heating circuit pump 2
The pump connected serves as a second heating circuit pump, which can be used for a
pump heating circuit.
For the second heating circuit, there is only time switch program 2 available, which has
the same structure as time switch program 1. Also refer to “time switch program 2" in
Index.
Only one room unit can be used for the 2 heating circuits. It is possible to assign the
effect of the room unit to both heating circuits. For details, refer to "room unit operating
mode" and "room unit values" in Index.
If the second heating circuit is used as extra heating for the bathroom, also refer to
setting line “extra heating for the bathroom” in Index.
4.30.2 System pump heating circuits
The pump connected to terminal K6 serves as a system pump, which can be used as a
heat supplier for other heating circuits. Hydraulically, it must be located after the d.h.w.
storage tank.
The system pump is activated as soon as one of the heating circuits calls for heat. If
there is no demand for heat, the pump will be deactivated followed by overrun.
4.30.3 System pump heating circuits and d.h.w.
The pump connected to terminal K6 serves as a system pump, which can be used as a
heat supplier for other heating circuits and for the d.h.w. storage tank. Hydraulically, it
must be located after the d.h.w. storage tank.
The system pump is activated as soon as one of the heating circuit or d.h.w. calls for
heat. If there is no demand for heat, the pump will be deactivated.
4.30.4 System pump with external demand for heat
The system pump considers demand for heat from heat consumers in the system that
are delivered via both inputs H1 and H2 and the LPB.
The system pump is activated as soon as there is demand for heat via inputs H1 and
H2 or the LPB. If there is no demand for heat, the pump will be deactivated.
4.30.5 D.h.w. circulating pump
The pump connected serves as the d.h.w. circulating pump.
The pump’s time schedule for operation can be selected either according to the “D.h.w.
program” or according to “Time switch program 2”.
The setting for this function must be made on line 122. Also refer to "switching program
selection circulating pump" in Index.
Time switch program
Effect of room unit
Extra heating for the
bathroom
Pump operation
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