RDU20U, RDU50U and RDU50.2U Room Temperature Controllers
Technical Instructions
with LCD for Heating and Cooling Systems
Document Number 155-735
November 1, 2006
Siemens Industry, Inc.
Page 7
Table 5. Control Parameters.
Parameter
Meaning
Setting Range
Factory
Setting
P01
Setpoint of heating in energy saving mode
(operating mode changeover switch activated)
OFF
41°F to 64°F (5°C to 18
C)
(in increments of 1.0°F [0.5°C])
61°F (16
C)
P02
Setpoint of cooling in energy saving mode
(operating mode changeover switch activated)
OFF
75°F to 95°F (24°C to 35
C)
(in increments of 1.0°F [0.5°C])
82°F (28
C)
P03
Minimum setpoint limitation in normal mode
41°F to 68°F (5°C to 20
C)
(in increments of 1.0°F [0.5°C])
41°F (5
C)
P04
Maximum setpoint limitation in normal mode
70°F to 95°F (21°C to 35
C)
(in increments of 1.0°F [0.5°C])
95°F (35
C)
P05*
Heat-cool changeover switching point cooling
50°F to 77°F (10°C to 25
C)
(in increments of 1.0°F [0.5°C])
61°F (16
C)
P06*
Heat-cool changeover switching point heating
81°F to 104°F (27°C to 40
C)
(in increments of 1.0°F [0.5°C])
82°F (28
C)
P07
Sensor calibration
-3 K to 3 K (1 Kelvin = 2°F)
0K
P08
P-band in heating mode (RDU50U and
RDU50.2U)
0.5 K to 4 K (1 Kelvin = 2°F)
(in increments of 1°F [0.5 K])
2K
P08
P-band in heating mode/switching differential
when ON/OFF output is selected (RDU20U)
0.5 K to 4 K (1 Kelvin = 2°F)
(in increments of 1°F [0.5 K])
2K
P09
P-band in cooling mode (RDU20 when
ON/OFF output selected)
0.5 K to 4 K (1 Kelvin = 2°F)
(in increments of 1°F [0.5 K])
1K
P10
Integration time
1 to 10 min. (in increments of 1 min.)
5 minutes
P11
Minimum output limitation in cooling mode
(normal operation) (RDU50U and RDU50.2U)
0 to 100% (in increments of 10%)
0%
P11
Actuator running time (RDU20U)
50 to 150 s (in increments of 10 s)
N/A
P12
Active temperature sensor (no setting, display
only)
01 = room temperature sensor active
02 = return air temperature sensor active
N/A
P13
Current room temperature reading (no setting,
display only)
32°F to 120°F (0°C to 49
C) = current
temperature value
N/A
P14*
Current heat-cool changeover
temperature reading including indication
of current mode ( , ) (no setting, display
only)
•
100 = input open (no sensor
connected, heating mode (
)
•
41°F to 104°F (5°C to 40
C) = current
temperature value
•
0 = input bridged, cooling mode
(
)
N/A
P15
Test mode for checking the actuator
direction
NOTE:
P15 can be turned off only if the
setting is back at “---” and by
pressing b and
–
simultaneously (RDU20U only).
“---“
=
Output Y1 and Y2 OFF.
“OPE” =
Output Y1 forced open
“CLO” = Output Y2 forced open
“---“
* Not applicable for RDU50.2U; LCD shows N/A.
