22/81
Siemens
RDG100.., RDG110.., RDG160T.. Basic Documentation
CE1P3181en
Building Technologies
Functions
2015-07-29
The table below shows the relation between parameter, temperature source and
temperature display:
Parameter P51
External temp. sensor
available
Source for display of room
temperature
Output control according to
Floor temp. limit
function
OFF
No
Built-in sensor
Built-in sensor
Not active
OFF
Yes
External temp. sensor
External temp. sensor
Not active
10…50 C (50...122 F)
No
Built-in sensor
Built-in sensor
Not active
10…50 C (50...122 F)
Yes
Built-in sensor
Built-in limit by
external sensor
Active
The floor temperature limitation function influences the outputs listed in the table
below:
*)
If P13 = ON
electric heater in cooling mode
Either floor temperature sensor or external room temperature sensor can be used.
This function increases the comfort in the room by keeping the supply air temperature
of the fan coil unit between the selected minimum and maximum temperature limits.
If the supply air temperature exceeds a limit, the thermostat reduces the
corresponding valve position until the supply air temperature is back in the limits.
In case the air flow is too low (especially with DC 0...10 V fans), this prevents cold air
from dumping into the room/warm air from bubbling straight up instead of circulating.
To enable this function, the multifunctional input, to which the supply air sensor is
connected, needs to be set to "Supply air sensor" (e.g. P38=9). Then the parameters
for the limits are visible (P63: minimum supply air temperature, P64: maximum supply
air temperature).
This function is only active in Comfort mode and can only be used with DC 0...10 V
actuators.
For applications with electric heater and radiator, this function is available only on the
cooling valve (in cooling mode).
Dewpoint monitoring is essential to prevent condensation on the chilled ceiling
(cooling with fan disabled, parameter P52). It helps avoid associated damage to the
building.
A dewpoint sensor with a potential-free contact is connected to multifunctional input
X1, X2 or D1. If there is condensation, the cooling valve is fully closed until no more
condensation is detected, and the cooling output is disabled temporarily.
The condensation symbol is displayed during temporary override.
The input must be commissioned accordingly (P38, P40, P42).
See section 4.10.
Floor temp. limit function has influence on
output
Application
Output Y1
Output Y2
Output Y3
Heat. mode
(P01=0/2/3)
Cool. mode
(P01=1/2/3)
Heat. and cool.
mode (P01=4)
Remark
2-pipe
H/C valve
Y1
N/A
2-pipe and electric heater H/C valve
Electric heater
Y2
Y2
*)
Only electric heater
2-pipe and radiator
H/C valve
Radiator
Y2
Y2
Only radiator
4-pipe
Heating valve Cooling valve
Y1
N/A
Y1
4-pipe and electric heater Heating valve Cooling valve Electric heater
Y3
N/A
Y3
Only electric heater
2-stage
1
st
H/C
2
nd
H/C
Y1, Y2
N/A
Note
Supply air temperature
limitation (RDG160T..)
Note
Dewpoint monitoring