Siemens RVA63.242 User Manual page 94

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Siemens Building Technologies
Landis & Staefa Division
4.31.4 Solar pump
When using a solar collector, a circulating pump for the collector circuit is required.
Depending on the hydraulic circuit and the selection of solar heat usage, it can be used
for d.h.w. heating or the buffer storage tank.
4.31.5 Pump H2
Pump H2 can be used for an additional consumer. Together with an external demand
for heat at input H1, it is possible to serve an air heater or similar.
4.31.6 Boiler bypass pump
The pump connected serves as a boiler bypass pump for maintaining the boiler return
temperature.
Control of the bypass pump can be selected, either parallel with the burner or according
to the measured return temperature. Also refer to "control of the bypass pump" in
Index.
4.31.7 Alarm signal
If an error occurs, either locally or in the system, leading to a display on error line 50,
the alarm relay will signal it.
Switching on takes place with a delay of two minutes.
When the fault is corrected, that is, when the fault status is no longer present, the relay
will be deenergized with no delay.
Basic Documentation RVA63.242, RVA53.242
Description of heating engineer settings
CE1P2373E
26.03.2001