Page 1
RDF30U
Technical Instructions
Document No. 155-335
September 27, 2007
Room Temperature Controller
with LCD for Four-Pipe Fan
Coil Units
Siemens Industry, Inc.
Description
Room temperature controller with LCD for four-pipe fan coil units.
Features
• Outputs for separate, heating and cooling on/off valve actuators.
• Outputs for a three-speed fan.
• Control depending on the room or the return air temperature.
• Operating modes: Normal, Economy and Standby.
• Operating mode changeover input for remote control (Day/Night).
• Air movement control function for avoiding damage resulting from moisture.
• Selectable installation and control parameters.
• Display of room temperature or setpoint (selectable).
• Electronic minimum and maximum setpoint limits.
• Operating voltage 24 Vac.
Application
Typical use:
• For controlling room temperature in individual rooms that are heated or cooled with
four-pipe fan coil units.
• For opening or closing two valves and for switching a three-speed fan.
Suitable for four-pipe fan coil unit systems with:
• automatic heating/cooling changeover.
• continuous heating or cooling mode.
Product Number
RDF30U
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Technical Instructions RDF30U Room Temperature Controller with LCD
Document Number 155-335 for Four-Pipe Fan Coil Units
September 27, 2007
Page 2 Siemens Industry, Inc.
Accessories
ARG70 Adapter plate for 4-inch × 4-inch or 2-inch × 4-inch conduit boxes
141-570 Lockable thermostat guard
QAH11.1 Changeover/remote temperature sensor
Warning/Caution
Notations
WARNING:
Personal injury or loss of life may occur if you do not perform
a procedure as specified.
CAUTION:
Equipment damage may occur if you do not follow a
procedure as specified.
Operation
The controller acquires the room temperature via its integrated sensor or optional
external return air temperature sensor (QAH11.1) and maintains the setpoint by
delivering two-position valve control output commands.
The switching differential is 2 K (3.6F) in Heating mode (adjustable in Parameter 10)
and 1 K (1.8F) in Cooling mode (adjustable in Parameter 11).
Fan Operation
The fan is switched to the selected speed via control output 12, 11 or 10.
When the “Temperature-dependent fan control“ function is activated (can be selected
with DIP Switch No. 1), the fan is switched on/off depending on the temperature,
together with the valve. It is switched off when any of the following occurs:
• leaving the heating or cooling sequence, provided the “Temperature-dependent fan
control“ function is activated.
• manually changing to Standby provided no setpoints (example, for freeze
protection) are set and active.
• activating an external operating mode changeover switch, provided application
conditions do not call for Economy mode.
• turning off the controller’s power supply.
Display
If DIP Switch No. 2 is set to ON (factory setting), the controller displays the measured
room or return air temperature (unless parameters or setpoints are temporarily
changed). If the DIP switch is set to OFF, the controller displays the Normal operating
mode setpoint. In this case, the value of the current temperature reading can only be
visualized temporarily by selecting Parameter P14.
Water-based Fan Coil
Application (Heating
mode)
When used in connection with four-pipe fan coils set DIP Switch No. 4 to ON.
Use in conjunction with two valves, for heating and cooling operation.
Heating Mode
Terminals 4 and 2 (neutral) or 5 and 2 command the control valve.
Output terminals 4 and 2 are closed (24 Vac) when:
1. the measured room temperature is half the switching differential below the setpoint
(W, Heating mode), and
2. the valve has been closed for more than one minute (Parameter P20).
Output terminals 4 and 2 are open (0 Vac) when:
1. the measured room temperature is half the switching differential above the setpoint
(W, Heating mode), and
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RDF30U Room Temperature Controller with LCD Technical Instructions
For Four-Pipe Fan Coil Units Document Number 155-335
September 27, 2007
Siemens Industry, Inc. Page 3
2. the valve has been open for more than one minute (Parameter 19)
NOTE: Output terminals 5 and 2 are the inverse of terminals 4 and 2.
Cooling Mode
Output terminals 6 and 2 (neutral) are open (0 Vac) when:
1. the measured room temperature is at half the switching differential below the
Cooling mode setpoint (W + Xdz – 1/2 SDC), and
2. the valve has been open for more than one minute (Parameter P19).
Output terminals 6 and 2 (neutral) are closed (24 Vac) when:
1. the measured room temperature is at half the switching differential above the
Cooling mode setpoint (W + Xdz + 1/2 SDC), and
2. the valve has been closed for more than one minute (Parameter P20).
T Room temperature
SDH Switching differential, Heating
SDC Switching differential, Cooling
Xdz Dead zone
w Room temperature setpoint
YH Heating valve, 24 Vac control output
YC Cooling valve, 24 Vac control output
Figure 1. Water-based Fan Coil
Heating and Cooling Mode.
Return Air Temperature
(Optional)
The RDF30U provides control based on the measured room temperature or the fan coil
unit’s return air temperature. It detects if a QAH11.1 cable temperature sensor is
connected to input 9-8 and then operates automatically according to that temperature.
Operating Modes
Normal Mode
Heating or Cooling mode with automatic changeover and manually selected fan speed
(III, II or I). In Normal mode, the controller maintains the adjusted setpoint in Heating
mode and; in Cooling mode, a temperature level represented by the setpoint plus the
dead zone.
Economy Mode
A potential-free operating mode changeover switch can be connected to status input
D1-GND. When the switch closes its contact (due to an open window, for instance), the
operating mode will change from Normal to Economy. In this operating mode, the
relevant setpoints of heating or cooling are maintained (adjustable in Parameters P01
[setback temperature for heating] and P02 [setback temperature for cooling]). The
operating action of the switch (NC or NO) can be selected.
Standby
The relevant setpoints of heating and cooling are maintained when in Standby “ ”
mode, provided those setpoints have been adjusted. The standby temperature setting
for Heating mode in Parameter P03 is adjustable from 41°F to 68°F (5°C to 20°C) or
“OFF” and the setting for Cooling mode in Parameter P04 is adjustable from 70°F to
95°F (21°C to 35°C) or "OFF".
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Technical Instructions RDF30U Room Temperature Controller with LCD
Document Number 155-335 for Four-Pipe Fan Coil Units
September 27, 2007
Page 4 Siemens Industry, Inc.
Avoiding damage due to
moisture (continuous
fan)
To avoid damage due to moisture in very warm and humid climates resulting from lack
of air circulation in Economy mode (for example, in hotel rooms during unoccupied
periods), the fan can be kept running in Economy mode when activating Parameter
P17. In this case, the fan keeps running at the selected speed or at speed I if the
operating mode selector is in Standby .
Setting the Control
Parameters
A number of control parameters can be set to optimize control performance. These
parameters can also be set during operation without opening the unit. In the event of a
power failure, all set control parameters will be maintained.
Settings
The parameters can be changed as follows:
1. Set the operating mode selector to Standby .
2. Press buttons "+" and "–" simultaneously for a minimum of three seconds. Release
them and, within two seconds, press the “+” button again for three seconds. The
display will show "P01".
3. Select the required parameter by repeatedly pressing the "+" and "–" buttons:
4. Press buttons "+" and "–" simultaneously, the current value of the selected
parameter appears, and can be changed by repeatedly pressing the "+" and "–"
buttons.
5. Press buttons "+" and "–" simultaneously again or five seconds after the last press
of a button. The last parameter will be displayed again.
6. To display and change additional parameters, repeat steps 3 through 5.
7. All changes will be stored and the controller returns to Normal operation 10
seconds after the last display or setting.
Page 5
RDF30U Room Temperature Controller with LCD Technical Instructions
For Four-Pipe Fan Coil Units Document Number 155-335
September 27, 2007
Siemens Industry, Inc. Page 5
Table 1. Control Parameters.
Para-
meter
Description
Setting Range
Factory
Setting
P01
Heating setpoint in Economy mode
(operating mode changeover contact activated )
OFF,
41F to 68F (5C to 20C) (in increments
of 0.5 K)
61F
(16C)
P02
Cooling setpoint in Economy mode
(operating mode changeover contact activated )
OFF,
70F to 95F (21C to 35C) (in
increments of 0.5 K)
82F
(28C)
P03
Heating setpoint in Standby “ ”
OFF,
41F to 68F (5C to 20C) (in increments
of 0.5 K)
46F
(8C)
P04
Cooling setpoint in Standby “ ”
OFF,
70F to 95F (21C to 35C) (in
increments of 0.5 K)
OFF
P05
Minimum setpoint limitation in Normal mode
41F to 68F (5C to 20C) (in increments
of 0.5 K)
41F
(5°C)
P06
Maximum setpoint limitation in Normal mode
70F to 95F (21C to 35C) (in
increments of 0.5 K)
95F
(35°C)
P09
Sensor calibration
-3 K to 3 K (-5.4F to 5.4F) (in increments
of 0.5 K)
0 K
P10
P-band in Heating mode or switching differential heating.
NOTE: This parameter is in degrees Kelvin, 1 K = 1.8F.
0.5 K to 4 K (1°F to 7°F) (in increments of
0.5 K)
2 K
(3.6°F)
P11
P-band in Cooling mode or switching differential cooling.
NOTE: This parameter is in degrees Kelvin, 1 K = 1.8F.
0.5 K to 4 K (1°F to 7°F) (in increments of
0.5 K)
1 K
(1.8°F)
P12
Dead zone in Normal mode
0.5 K to 10 K (1°F to 18°F) (in increments
of 0.5 K)
2 K
(3.6°F)
P13
Active temperature sensor (no setting, display only)
1: Room temperature sensor active
2: Return air temperature sensor active
--
P14
Value of current room temperature reading
(no setting, display only)
32F to 120F (0C to 49C) = current
temperature value
--
P17
Fan control in Economy mode
OFF: Fan is off in the dead zone
ON: Fan is on in the dead zone,
ON: Running at the selected speed or at
speed 1 if in Standby
OFF
P18
Setpoint differential
0.5K to 5K (1°F to 9°F)
(in increments of 0.5 K)
2 K
(3.6°F)
P19
Minimum output on time (4, 6)
1 to 20 minutes (in increments of 1 min.)
1 min.
P20
Minimum output off time (4, 5)
1 to 20 minutes (in increments of 1 min.)
1 min.
P21
Fan overrun
0 to 300 seconds (in increments of 10 s)
0 s
P22
Point of reference for setpoint in Normal mode
HA: Heating sequence;
CL: Cooling sequence
HA
P23
Display unit of measure
°F, °C
°F
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Technical Instructions RDF30U Room Temperature Controller with LCD
Document Number 155-335 for Four-Pipe Fan Coil Units
September 27, 2007
Page 6 Siemens Industry, Inc.
Ordering
The QAH11.1 temperature sensor can be used as a return air temperature sensor. The
changeover sensor and the valves must be ordered separately.
Equipment
Combinations
Table 2.
Product Number
Description
Technical Instructions
QAH11.1
Temperature Sensor
155-329P25
599 Series
Two-way and Three-way
Zone Valves
155-320P25
SF Series
Zone Valve Actuator
155-321P25
Mechanical Design
The controller consists of two parts:
▪ Plastic housing which accommodates the electronics, the operating elements and
the built-in room temperature sensor
▪ Base
The housing engages in the base and is secured with two screws. The base carries the
screw terminals. The DIP switches are located at the rear of the housing.
Setting and Operating
Elements
Figure 2. RDF30U Components.
1
Display of the room temperature, setpoints or control parameters
2
Symbol used when displaying the current room temperature
3
Normal mode
Economy mode
4
Cooling valve open
Fan on
Heating valve open
5
Buttons for adjusting the setpoints and the control parameters
6
Operating mode selector
(Standby “ ”, Heating or Cooling mode with manual selection of fan speed)
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RDF30U Room Temperature Controller with LCD Technical Instructions
For Four-Pipe Fan Coil Units Document Number 155-335
September 27, 2007
Siemens Industry, Inc. Page 7
Table 3. DIP Switches.
DIP Switch
No.
Description
Position ON (Factory Setting)
Position OFF
1
Fan control
Fan control is temperatureindependent in Normal mode
Fan control is temperaturedependent in all operating
modes
2
Display of temperature or setpoint
Room (or return air) temperature
display
Setpoint display
3
Operating action of switch for external
operating mode changeover
Changeover activated when switch is
closed
Changeover activated when
switch is open
4
Output sequence
Heating and cooling (four-pipe)
Two-stage cooling
Mounting,
Installation and
Commissioning
Notes
▪ Mounting location: On a wall or inside the fan coil unit.
▪ Do not mount in niches or bookshelves, behind curtains, above or near heat
sources.
▪ Do not mount in direct sunlight.
▪ Mounting height is approximately 60 inches (1.5 m) above the floor.
▪ The connecting wires can be run to the controller from a recessed conduit box.
Figure 3. Acceptable Mounting Height in Inches.
▪ Check the positions of the DIP switches and change them, if required.
▪ After applying power, the controller makes a reset during which all LCD segments
flash, indicating that the reset has been correctly made. This takes about three
seconds. Then, the controller is ready to operate.
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Technical Instructions RDF30U Room Temperature Controller with LCD
Document Number 155-335 for Four-Pipe Fan Coil Units
September 27, 2007
Page 8 Siemens Industry, Inc.
Mounting,
Installation and
Commissioning
Notes, Continued
▪ Prior to installing the changeover sensor, thermal conductive paste must be applied
to the location on the pipe where the sensor is placed.
▪ Installation Instructions are included with the controller.
WARNING:
• Sensor inputs 7, 8, and 9 carry live voltage potential. If the sensor’s
cables must be extended, the cables used must be suited for live
voltage.
• The cables used must meet the insulation requirements for live
voltage.
Calibrating the Sensor
If the room temperature displayed by the controller is inconsistent with the room
temperature being measured, the temperature sensor of the RDF30U can be
recalibrated. To recalibrate, change Parameter P09.
Specifications
Power Supply
Operating voltage 24 Vac, +20/-25%
Frequency 50/60 Hz
Power consumption 6 VA maximum
Fan control outputs 12, 11, 10 24 Vac
Rating 5 (3) A maximum
Valve control output 4, 6 (NO) 24 Vac
55 (3) A maximum
Return air temperature sensor QAH11.1 safety class II
status input 9-8 NTC resistor 3 k at 77°F (25°C)
Status input D1 and GND
Contact sensing SELV 6 to 15 Vdc/3 to 6 mA
Insulation against live voltage 4 kV, reinforced insulation
Operating action Selectable
Permissible cable length with copper 262 ft (80 m)
cable 14 AWG for connection to terminals
7, 8, 9 and D1, GND
Operational Data
Setpoint setting range 41°F to 95°F (5°C to 35°C)
Control deviation at 77°F (25°C) + 0.5 K (1°F) maximum
Switching differential in Heating mode, 2 K (3.6°F)
adjustable
Switching differential in Cooling mode, 1 K (1.8°F)
adjustable
Dead zone Xdz in Normal mode (adjustable) 2 K (3.6°F)
Setpoint, Economy mode , heating, 61°F (16°C)
adjustable
Setpoint, Economy mode , cooling, 82°F (28°C)
adjustable
Setpoint, Standby , heating, adjustable 46°F (8°C)
Setpoint, Standby , cooling, adjustable OFF
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RDF30U Room Temperature Controller with LCD Technical Instructions
For Four-Pipe Fan Coil Units Document Number 155-335
September 27, 2007
Siemens Industry, Inc. Page 9
Specifications,
Continued
Environmental Conditions
Operation
Temperature 32°F to 122°F (0°C to 50°C)
Humidity <95% rh
Transport and storage
Temperature -13°F to 158°F (-25°C to 70°C)
Humidity <95% rh
Agency Approvals
UL Listing UL 873
General
Connection terminals Solid wires or prepared stranded
wires 2 × 16 AWG or 1 × 14 AWG
Weight 0.5 lb (0.23 kg)
Housing front color White, NCS S 0502-G (RAL 9003)
Wiring Terminals
Figure 4. Wiring Terminals.
1, 2 24 Vac negative
3 24 Vac positive
4 Control valve output, 24 Vac
5 Control valve output, 24 Vac
(inverse of output 4)
6 Control output, second stage
heating or cooling (NO contact)
8 Measuring neutral, remote sensor
9 Return air temperature sensor
10 Control output, Fan speed III, 24 Vac
11 Control output, Fan speed II, 24 Vac
12 Control output, Fan speed I, 24 Vac
D1, Status input for potential-free
GND operating mode changeover switch
Wiring Diagrams
Figure 5. Four-Pipe Fan Coil Units.
B1 Return air temperature sensor
(QAH11.1)
M1 Three-speed fan
N1 Room temperature controller
RDF30U
S1 External operating mode
changeover switch
SN 24 Vac, negative
SP 24 Vac, positive
Y1 Zone valve for Heating mode
Y2 Zone valve for Cooling mode
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Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as
design improvements are introduced. Product or company names mentioned herein may be the trademarks of their respective owners.
© 2007 Siemens Industry, Inc.
Siemens Industry, Inc.
Building Technologies Division
1000 Deerfield Parkway
Buffalo Grove, IL 60089
+ 1 847-215-1000
Your feedback is important to us. If you have comments
about this document, please send them to
SBT_technical.editor.us.sbt@siemens.com
Document No. 155-335
Printed in the USA
Page 10
Dimensions in
Inches (Millimeters)
Figure 6. RDF30U Controller.
Figure 7. Base Plate.
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