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Siemens Building Technologies
Basic Documentation RVD230
CE1P2383en
HVAC Products
26 Function block Test and display
27.05.2004
If a radio clock receiver is connected to the data bus, the RVD230 can receive the radio
signals via data bus. On operating line 165, 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 shows
r c l
(Radio Clock) and
hh:mm
. If there is no valid value available,
the display cannot be selected. The reason can be one of the following:
•
No radio clock receiver connected
•
Controller has no data bus address
•
Connection interrupted
26.7 Limitations
Active limitations are displayed on operating line 169. Interrogation is made with the
setting buttons
and
.. Each limitation is assigned a code and the respective limi-
tation symbol.
Code
Symbol Type of limitation Limited variable
1
Maximum
Volumetric flow or output primary controller
2
Maximum Precontrolled
primary
return
3
Maximum
Temperature differential (DRT) precontrolled
flow
4
Maximum
Precontrolled secondary flow
5
Maximum
Volumetric flow or output heating circuit
6
Maximum
Primary return heating circuit
7
Maximum
Secondary return heating circuit
8
Maximum
Temperature differential (DRT) heating circuit
9
Maximum
Secondary flow heating circuit
10
Maximum
Room temperature heating circuit
11
Maximum
Rate of flow temperature increase heating
circuit
18
Maximum
Primary return d.h.w.
19
Maximum
Secondary return d.h.w.
20
Minimum
Suppression of hydraulic creep precontrolled
primary return
21
Minimum
Precontrolled secondary flow
22
Minimum
Suppression of hydraulic creep primary re-
turn heating circuit
23
Minimum
Secondary flow heating circuit
24
Minimum
Reduced room temperature setpoint
In general: The maximum limitation functions will be activated when the respective
demand for temperature (not the actual value!) exceeds the limit value.
26.8 Software
version
The software version is displayed on operating line 170. It is important for service staff
when making fault diagnoses.
Radio clock receiver
