Document No. 129-491
Installation Instructions
October 6, 2009
Siemens Industry, Inc. Page 5 of 7
DIP Switch Settings
Table 1. RDU20U.
Table 2. RDU50U/RDU50.2U.
Number Description On Off
information
Temperature
Cooling - DA
Heating - RA
*Cooling - RA
Heating - DA
Table 3. RDX42.22U
Number Description On Off
1 Operating
action of
remote
ON/OFF switch
* Changeover
activated
when switch
is closed
Changeover
activated
when switch
is open (NC)
2
heating
heater
heater
3
Temperature/
setpoint display
4 Temperature
Celsius * Fahrenheit
* Factory settings
NOTE: DA = T increases, Y increases
RA = T increases, Y decreases
Changing the Control Parameters
To optimize the control performance, a number of control
parameters can be adjusted. This can also be made
during operation without opening the controller.
To change the control parameters of the heating and/or
cooling setpoints in the Normal or Energy Saving mode,
or increase/decrease the proportional band in Heating
and Cooling mode, proceed as follows.
(For factory settings, see Commissioning)
Press the + and – buttons simultaneously for
a minimum of 3 seconds and a maximum of
5 seconds. Release them and within 2
seconds, press the + button again for 3
seconds. The display will show “P01”.
1. Select the required parameter by
repeatedly pressing the + or – button.
P01 P02 P14 P15
+- +-+
- -
+
3055z01
2. Press the + and – buttons
simultaneously. The current value of the
selected parameter appears, and can be
changed by repeatedly pressing the + or
– button.
3. Press buttons + and - simultaneously
again, or wait 5 seconds after the last
press of a button, to display the last
parameter.
4. Repeat steps 3 through 5 to display and
change additional parameters.
5. Wait 10 seconds after the last display or
setting; all changes will be stored.
Sensor Recalibration
If the room temperature displayed by the controller does
not agree with the actual room temperature, the
temperature sensor can be recalibrated by changing
parameter P07 (P09 in RDX42.22U).
See Changing the Control Parameters and
follow steps 1 through 3 to select parameter
P07 (P09 in RDX42.22U).
With Step 4, the room temperature displayed
can now be matched to actual room
temperature. Each press of the + or – button
changes the temperature by +/– 1°F (0.5 K)
up to a maximum range of -5.4°F to 5.4°F (-3
K to 3 K) (0.5 Kelvin = 1°F) Continue with
Steps 4 through 7.
With Step 7, the recalibration is automatically
stored 10 seconds after the last readjustment.
