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Siemens Basic Documentation RVP340, RVP350, RVP351 CE1P2545en
Building Technologies 4 Acquisition of measured values 15.03.2011
4.2 Flow temperature (B1)
4.2.1 Types of sensors
Suitable are Siemens sensors operating with a sensing element LG-Ni1000.
Averaging with 2 sensors is not possible.
4.2.2 Error handling
A flow sensor with a short-circuit or an interruption always leads to a corresponding
error message, irrespective of the type of plant. If that case, the heating circuit
pump is activated and the mixing valve on the primary side is driven to the fully
closed position when using a mixing circuit, and the heating circuit pump is deacti-
vated when using a pump circuit.
If there is a short-circuit or an interruption and the flow temperature is queried, the
display of the QAW70 room unit shows ---.
4.3 Boiler temperature (B2)
4.3.1 Types of sensors
The boiler temperature is required in connection with plant type 3 - x.
Suitable are Siemens sensors operating with a sensing element LG-Ni1000.
4.3.2 Error handling
In the event of a short-circuit or an interruption of the measuring circuit, an error is
displayed. The plant responds as follows:
The burner shuts down
Pump M1 runs continuously
4.4 Outside temperature (B9)
4.4.1 Types of sensors
The following types of sensors can be used:
Outside sensor QAC22 (sensing element LG-Ni1000)
Outside sensor QAC32 (sensing element NTC 575)
The controller identifies automatically the type of sensor used. The measuring
range is –50…50 °C.
The outside temperature can also be acquired via LPB; refer to chapter 17.5.2
"Outside temperature source".
4.4.2 Error handling
In the event of a short-circuit or an interruption of the measuring circuit, the control-
ler responds as follows, depending on the outside temperature source:
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