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Siemens Building Technologies
Basic Documentation RVA47.320
CE1P2379E
HVAC Products
Description of the heating engineer settings
15.07.2002
4
1
2
3
B10
B70
23
79
S2
7
B10
Cascade flow temperature sensor
– – –
Sensor with open-circuit, no sensor connected, or sensor incorrectly
defined
0 0 0
Sensor with short-circuit
4.7
Actual value of the cascade return
temperature
When using several cascaded heat sources, we recommend to use a cascade return
temperature sensor (B70).
It is also termed "Common return temperature sensor”.
1. Press the operating line selection buttons to select operating line 57.
2. No setting can be made with the + / - buttons.
Display
Unit
0...140 °C
The temperature measured with the cascade return temperature sensor (B70) will
automatically be displayed on this line.
In a cascaded system, a common cascade return temperature sensor (B70) should be
used for all heat sources. The value of this sensor is used for optimizing the controller’s
functionality. In particular, it permits the detection of wrong mass flows (primary /
secondary mass flow).
The cascade return temperature sensor is connected directly to the RVA47.320.
Special displays
Description
Setting
Effect
Cascade return
temperature sensor
