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Siemens
RDG400KN,RGD405KN Basic documentation
CE1P3192en
Building Technologies
2017-02-17
3.10.10 Primary fan overrun after switching off the electric
heater
To avoid overheating of the electric heater after it has been switched off, the air
flow must be maintained for a while.
In connection with a supply air controller (e.g. Synco RMU7..) this will be
automatically ensured by exchanging the necessary information. The controller of
the supply air fan will only switch off the supply air fan when all electric heaters are
cooled off.
The cool off time of the electric heater can be adjusted for each heater via P54
(factory setting is 60 seconds).
General rule: In case of insufficient air flow, the thermostat cannot protect the
electric heater against overtemperature. For this reason, the heater
must
be
equipped with a separate safety device (thermal cutout).
3.10.11 Fault function on KNX
If a fault occurs (e.g. digital fault input, dewpoint, communication configuration,
etc.), a fault is sent on the bus.
An RDG.. thermostat listens on the bus and sends its fault when it has the highest
alarm priority. This ensures that the management station does not miss any alarms.
If alarms occur at the same time, the alarm with the highest priority is first displayed
and sent on the bus.
Fault transmission is different in LTE- and S-Mode:
S-Mode
LTE-Mode
Fault state
Alarm info (error code and internal information)
Fault information
(internal
information)
Alarm text (default text can be edited with ACS tool)
The table below shows the error code and default alarm texts:
Thermostat
Fault information on the bus
Prio
Fault
Display
Error code
Default fault text
Text
adjustable *)
-
No fault
---
0
No fault
1
Bus power supply**)
bus
5000
No bus power
supply
---
2
Device address error
Addr
6001
>1 id device address
---
3
Condensation
4930
Condensation in the
room
4
External fault input X1
AL1
9001
Fault input 1
5
External fault input D1
AL3
9003
Fault input 3
*) Default alarm texts are stored in the thermostat’s non-volatile memory and can be adjusted using
the ACS tool
**) This error will not be sent on the bus (because there is no bus!)
Note
Caution
KNX
R
