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Siemens Building Technologies Basic Documentation RVA47.320 CE1P2379E
HVAC Products Description of the heating engineer settings 15.07.2002
cascade for use with a buffer storage tank temperature sensor (B4). The sensor values
are automatically transmitted to the cascade master. Within a cascade, each type of
sensor may occur only once (with the exception of the outside sensor).
When using input B70/B4 for a buffer storage tank temperature sensor (B4), the
temperature measured at B4 is used to decide whether the consumers receive their
heat from the cascade or from the buffer storage tank.
If the temperature measured in the buffer storage tank is higher than the flow
temperature called for by the consumers, the cascade will be locked and the
consumers receive their heat from the buffer storage tank.
If the temperature measured in the buffer storage tank is lower than the flow
temperature called for by the consuemrs, the buffer storage tank will be locked and the
consumers receive their heat solely from the cascade.
Example of a hydraulic circuit with a buffer storage tank. The buffer storage tank can be
charged by any type of heat source (wood-fired boiler, solar collectors, heat pump, etc).
2379S37
B10
B70
B9
B4
FK
FK
SK
SK
V
V
21
SK = solar collectors
FK = solid fuel boiler
V = consumer
The changeover valve must be connected in parallel to the pump of the first BMU. This
BMU must be excluded from automatic changeover of the boiler sequence (refer to
operating line 131).
Use as a buffer storage
tank temperature sensor
Example
Connection of diverting
valve
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