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Siemens Building Technologies Basic Documentation RVL471 CE1P2524E
HVAC Products 25 Function block "Service functions and general settings" 23.10.2002
25.2.5 Identification number of room unit
Based on the number shown in the display, the type of room unit used can be identi-
fied.
The types of room units that can currently be used with the RVL472 carry the following
numbers:
82 = QAW50
83 = QAW70
The RVL471 ignores room units that cannot be used (e.g. QAW20) and generates an
error message (error code 62).
25.2.6 Radio clock, elapsed time since last reception
If a radio clock receiver is connected to the data bus, the RVL471 can receive the radio
signals via data bus. On operating line 197, it is possible to see how much time has
elapsed (hh:mm) since the radio clock receiver received the last correct time telegram.
The display of --:-- has the following meaning:
• No radio clock receiver connected
• Controller has no data bus address
• Connection interrupted
25.3 Commissioning aids
25.3.1 Simulation of the outside temperature
To facilitate commissioning and fault tracing, outside temperatures in the range −50 to
+50 °C can be simulated. This simulation has an impact on the actual, the composite
and the attenuated outside temperature.
Simulated T
A
= actual T
A
= composite T
A
= attenuated T
A
During the temperature simulation, the actual outside temperature (as acquired by the
sensor or via LPB) will be overridden.
When the simulation is terminated, the actual outside temperature will gradually read-
just the composite and the attenuated temperatures to their correct values. The simu-
lation of the outside temperature causes therefore a reset of the attenuated and the
composite outside temperatures.
There are 3 choices to terminate the simulation:
• Entry of --.-
• Leaving the setting level by pressing the Info button or any of the operating mode but-
tons
• Automatically after 30 minutes
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