Siemens RDU50U Owner's manual

RDU20U, RDU50U and

RDU50.2U

Technical Instructions

Document No. 155-735

November 1, 2006

Room Temperature Controllers

with LCD for Heating and

Cooling Systems

RDU20U and RDU50U

RDU50.2U

Siemens Industry, Inc.

Description

The RDU Series Room Controller with LCD is designed for heating and cooling

systems.

Features

•Modulating Proportional + Integral (P+I) control

•Control depending on room or remote air temperature

•Output for a 0 to 10 Vdc actuator (RDU50U and RDU50.2U)

•Output for a floating (3-position) or on/off output actuator (RDU20U)

•Adjustable actuator run time (RDU20U)

•Automatic heating/cooling changeover (RDU20U and RDU50U)

•Manual heating/cooling changeover (RDU50.2U)

•Operating modes: Normal, Energy Saving and Off

•Operating mode changeover input for remote control

•Selectable installation and control parameters

•Adjustable minimum limitation for cooling output

•Optional selectable Direct Acting or Reverse Acting output

•Selectable display of room temperature or setpoint

•Fahrenheit or Celsius selectable

•Minimum and maximum setpoint limitation

•Operating voltage, 24 Vac

Application

•Individual room temperature control in heating or cooling HVAC applications.

•Control of that are heated or cooled.

Product Numbers

Table 1.

Product Numbers

Features

RDU20U

Automatic heating/cooling changeover

RDU50U

Automatic heating/cooling changeover

RDU50.2U

Manual heating/cooling changeover switch

Technical Instructions RDU20U, RDU50U and RDU50.2U Room Temperature Controllers

Document Number 155-735 with LCD for Heating and Cooling Systems

November 1, 2006

Page 2 Siemens Industry, Inc.

Accessories

ARG70 Adapter Plate for 4-inch × 4-inch conduit boxes

QAH11.1 Changeover/Remote Temperature Sensor

141-570 Lockable Thermostat Guard

Ordering

The temperature sensor, valves, and damper actuators must be ordered separately.

Table 2. Equipment Combinations.

RDU50U and RDU50.2U

Product Number

Description

Technical

Instructions

SSB61U..

0 to 10 Vdc valve actuators

155-192P25

SSC61U..

155-313P25

SQS65U

SSC61.5U

SQS65.5U

155-190P25

GDE16…

44 lb-in NSR air damper actuators

155-187P25

GLB16…

88 lb-in NSR air damper actuators

155-187P25

RDU20U

SSB81U..

Floating control valve actuators

155-195P25

SSC61U..

155-314P25

SSC81U

SQS65.5U

155-308P25

GDE131…

44 lb-in NSR air damper actuators

155-187P25

GLB131…

88 lb-in NSR air damper actuators

155-187P25

All Models

Powermite MZ Series

Two-way globe zone valves

155-198P25

Powermite MZ Series

Three-way globe zone valves

155-199P25

Powermite MT Series

Two-way globe zone valves

155-196P25

Powermite MT Series

Three-way globe zone valves

155-197P25

Powermite 599 Series

Two-way ball valves

155-704P25

Function

The controller measures the room temperature with its integrated sensor or via a

remote return air temperature sensor (QAH11.1) and maintains the setpoint by

delivering continuous control commands to the actuators (0 to 10 Vdc [RDU50U and

RDU50.2U] or 24 Vac on/off, or three-position [RDU20U]). The controller provides P+I

control. The factory setting for the proportional band in heating mode is 3.6°F (2°C),

and in cooling mode 1.8°F (1°C) (adjustable). The integral action time is five minutes

(adjustable). Motor run time for the RDU20U is adjustable from 50 to 150 seconds in

10-second increments.

RDU20U

Figure 1. Heating/Cooling Modes.

C/O Changeover

P-band Proportional band

T Room temperature

W Room temperature setpoint

Y Y output percentage

NOTE: Diagram only shows

P-characteristic

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 3

Function, Continued

RDU50U and RDU50.2U

Figure 2. Heating Mode, RA.

(DIP Switch 2 in ON Position)

Figure 3. Cooling Mode, RA.

(DIP Switch 2 in ON Position)

Figure 4. Heating Mode, DA.

(DIP Switch 2 in OFF Position)

Figure 5. Cooling Mode, DA.

(DIP Switch 2 in OFF Position)

T Room temperature

XpH Proportional band heating

XpK Proportional band cooling

W Room temperature setpoint

YOut Output percentage

NOTE: The diagrams only show the proportional part of the P+I controller.

Automatic Changeover

RDU50U and RDU20U

The water temperature measured by the changeover sensor (QAH11.1) is used by the

controller to switch from heating to cooling mode, or vice versa. When the water

temperature is above 82°F (28°C), the controller switches to Heating mode; below

61°F (16°C), it switches to Cooling mode.

If immediately after switching on, the temperature is between the two changeover

points, the controller will start in Heating mode. The medium temperature is measured

at half-minute intervals and the operational status updated. The value of the current

temperature reading and the mode can be visualized temporarily by selecting

parameter P14.

In systems without automatic changeover, the temperature sensor can be replaced by

an external switch for manual changeover. In systems with continuous heating mode,

no sensor will be connected to the controller’s input. With continuous cooling mode, the

controller changeover input must be bridged.

CM Cooling mode

HM Heating mode

M Operating mode

TWWater temperature

Figure 6. Automatic Changeover Mode.

Technical Instructions RDU20U, RDU50U and RDU50.2U Room Temperature Controllers

Document Number 155-735 with LCD for Heating and Cooling Systems

November 1, 2006

Page 4 Siemens Industry, Inc.

Inversion of Output

Signal

RU50U and RDU50.2U

The output signal can be inverted with the help of DIP Switch No. 2. If set to ON, 0V

corresponds to 0% travel and 10V to 100% travel (reverse acting heating/reverse acting

cooling). In the OFF position, 0V corresponds to 100% travel and 10V to 0% travel

(direct acting heating/direct acting cooling). See Figure 7 and Figure 8 for control

characteristics.

Heating-Cooling with

Minimum Limitation

Cooling

RU50U and RDU50.2U

Figure 7. Reverse Acting Heating/

Reverse Acting Cooling Function

Diagram.

Figure 8. Direct Acting Heating/Direct

Acting Cooling Function Diagram.

T Room temperature

YOut Output percentage

W Room temperature setpoint

XpH Proportional band heating

XpK Proportional band cooling

VR 0% to 100% minimum limitation of

cooling output

c/o Changeover

Minimum Limitation of

Cooling Signal

Using parameter P11, the cooling signal output can be limited to a minimum value

between 0 and 100% (0 to 10 Vdc). This can be used to ensure a minimum supply air

volume. When used in connection with a VAV controller, this setting must be taken into

account. See VR in Figure 7 and Figure 8.

Return Air Temperature

The RDU Controllers provide control depending on either the measured room

temperature or the return air temperature. The return air temperature measurement

overrides the internal measurement automatically if a QAH11.1 cable temperature

sensor is connected to input 4–3 (RDU50U and RDU50.2U) or 8–9 (RDU20U).

Parameter P12 shows which temperature sensor is currently active.

Display

(See Table 5)

•The settings for Parameters P12, P13, and P14 cannot be changed; they are for

displaying information settings only.

•The RDU50.2U Controller does not have a parameter setting or display for

Parameter P14.

•Parameter P14 (RDU20U and RDU50U) displays the current heat/cool changeover

temperature 32°F to 120°F (0°C to 49°C), and

100 = Input open or no sensor connected–Heating mode

00 = Input bridged–Cooling mode.

•For Parameter P12:

01 = The room temperature sensor is active.

02 = The return air temperature sensor is active.

•Parameter P13 displays the current room temperature 32°F to 120°F (0°C to 49°C).

Operating Modes

Normal Mode

Heating or cooling mode with automatic changeover. The controller maintains the

adjusted setpoint in normal operation.

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 5

Energy Saving Mode

A changeover switch can be connected to the dry contact (D1–GND). When the switch

closes its contact (due to an open window, for instance), the operating mode will

change from normal operation to Energy Saving mode. In this operating mode, the

heating or cooling setpoints are maintained (setting of control parameters P01 and

P02). If the Energy Saving mode setpoints are set to OFF, the controller will turn OFF

when the switch closes its contact.

When activated, the status input (D1–GND) overrides the

RDU20U/RDU50U/RDU50.2U setpoints as follows:

•Heating Mode →Parameter 01 becomes active

•Cooling Mode →Parameter 02 becomes active

•OFF →No effect

Mechanical Design

•The unit consists of two parts:

−Plastic housing−accommodates the electronics, the operating elements, and

the built-in room temperature sensor.

−Base plate−houses the wire terminations.

•The housing engages in the controller base and is secured with two screws.

•The screw terminals are mounted on the base plate.

•The DIP switches are located on the circuit board, which is accessible through the

rear of the housing. To access the DIP switches, remove the housing from the base

plate. See Figure 9.

Figure 9. DIP Switch Setting.

Table 3. RDU20U DIP Switches.

DIP Switch No.

Description

Position ON

Position OFF

LCD display

Room (return air)

temperature

Setpoint*

Control Algorithm

3-P modulating PI

control*

ON/OFF control

Not used

Temperature scale

Fahrenheit*

Celsius

Table 4. RDU50U and RDU50.2U DIP Switches.

DIP Switch No.

Description

Position ON

Position OFF

LCD display

Room temperature*

Setpoint

0 to 10 Vdc output logic

Cooling –RA

Heating –RA

Cooling –DA*

Heating –DA

Not used

N/A

Temperature scale

Celsius

Fahrenheit*

* Factory setting

Technical Instructions RDU20U, RDU50U and RDU50.2U Room Temperature Controllers

Document Number 155-735 with LCD for Heating and Cooling Systems

November 1, 2006

Page 6 Siemens Industry, Inc.

Setting and

Operating Elements

Figure 10.

1 Display of the room or return air

temperature, setpoints, and control

parameters

2 Symbol used when displaying the

current room temperature

3 Normal operation

Energy Saving mode

4 Cooling valve open

Heating valve open

5 Buttons for adjusting the setpoints and

the control parameters

6 Slider switch for manual heat-off-cool

setting (RDU50.2U only)

Setting the Control

Parameters

A number of control parameters can be set to optimize the control performance. These

parameters can also be set during operation without opening the unit. A 24 Vac supply

to the controller is required to enable parameter adjustment.

The parameters can be changed as follows:

1. Press buttons "+" and "–" simultaneously for a minimum of three seconds and a

maximum of five seconds. Release the buttons and then press button "+" again for

approximately three seconds until the display shows “P01“.

2. Select the required parameter by repeatedly pressing buttons "+" or "–".

3. Press buttons "+" and "–" simultaneously. The current value of the selected

parameter appears, which can be changed by repeatedly pressing either button.

4. Press buttons "+" and "–" simultaneously again, or five seconds after the last press

of a button, to store the new value and display the parameter.

5. Repeat steps 2 through 4 to display and change additional parameters.

6. Wait ten seconds after the last display or setting. All changes will be stored and the

controller returns to normal operation.

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)

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])

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])

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])

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%)

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 buttons + 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.

Technical Instructions RDU20U, RDU50U and RDU50.2U Room Temperature Controllers

Document Number 155-735 with LCD for Heating and Cooling Systems

November 1, 2006

Page 8 Siemens Industry, Inc.

Engineering Notes

RDU50U with heating-cooling changeover input 2–3 and

RDU20U with heating-cooling changeover input 7–8:

•In systems without automatic changeover, the temperature sensor can be replaced

by an external switch for manual changeover.

•In systems with Heating only mode, do not connect a sensor to the controller’s input.

•With Cooling only mode, the controller input must be bridged.

Mounting,

Installation and

Commissioning

Notes

•Check the position of the DIP switches and change them, if necessary.

•After applying power, the controller makes a reset, which takes approximately three

seconds; it is then ready to operate.

•Mount the unit on a wall of the room to be heated or cooled. Do not mount in direct

sunlight or near other heat or refrigeration sources. (See Figure 11.)

•Mounting height is approximately 60 inches (150 cm) above the floor.

(See Figure 11.)

•The connecting wires can be run to the controller from a recessed conduit box.

Figure 11. Acceptable Mounting Locations.

•Prior to fitting the changeover sensor on a pipe, thermal conductive paste must be

applied to the location on the pipe where the sensor is to be placed.

•The cables used must satisfy the insulation requirements for 24 Vdc potential.

•To access the wire terminal block, loosen the cover screw and open the plastic

cover. See Figure 12.

Figure 12. Accessing the Wire Terminal Block.

•Sensor inputs 4–3 and 2–3 (RDU50U and RDU50.2U) and 8–9 and 8–7 (RDU20U)

carry 24 Vdc potential. If the sensor's cables must be extended, they must be suited

for 24 Vdc voltage.

•Complete installation instructions are included with the controller.

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 9

Specifications

Power Supply

Operating voltage 24 Vac +20%

Frequency 50/60 Hz

Power consumption Maximum 4 VA

Control output 1–5 (RDU50U and RDU50.2U) 0 to 10 Vdc

Resolution 39 mV

Effective current Maximum +1 mA

Control output 4–6 (RDU20U) 24 Vac

Return air temperature input 4–3 QAH11.1 safety class 2

Changeover temperature input 2–3 NTC resistor 3K ohm at 77°F (25°C)

(RDU50U) and RDU20U

8–7 (RDU20U)

Dry contact D1 and GND

Contact sensing 6 to 15 Vdc/3 to 6 mA

Operating action Normally Open (NO)

Maximum cable length 16 AWG 262 feet (80 m)

for connection to terminals 4, 2 and D1

Operational data

Setpoint setting range 41°F to 95°F (5°C to 35°C)

Control deviation at 77°F (25°C) Maximum +1.6°F (0.9°C)

P-band in heating mode, adjustable

in 0.5K increments (1 Kelvin = 2°F) 0.5K to 4K

Factory setting 2K

P-band in cooling mode, adjustable

in 0.5K increments (1 Kelvin = 2°F) 0.5K to 4K

Factory setting 1K

Integral action time, adjustable 1 to 10 minutes

Factory setting 5 minutes

Setpoint (Energy Saving Mode ), heating 41°F to 65°F (5°C to 18°C)

Setpoint (Energy Saving Mode ), cooling 75°F to 95°F (24°C to 35°C)

Environmental

Conditions

Operation

Temperature 32°F to 122°F (0°C to 50°C)

Humidity <95% rh

Shipping and storage

Temperature (RDU50U and RDU50.2U) -13°F to 158°F (-25°C to 70°C)

(RDU20U) -13°F to 140°F (-25°C to 60°C)

Humidity <95% rh

Agency Approvals

Conforms to CE requirements

NEMA 1

General

Connection terminals Use solid wires or prepared stranded

wires. 2 × 16 AWG or 1 × 14 AWG

Maximum 20 AWG

Weight 0.5 lb (0.23 kg)

Housing color

Cover White

Base Gray

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.

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.ed[email protected]m

Document No. 155-735

Printed in the USA

Page 10

Wiring Diagrams

1 Operating voltage, 24 Vac negative

2 Operating voltage, 24 Vac positive

3 Operating voltage, 24 Vac positive

4 Control signal, opening 24 Vac

6 Control signal, closing, 24 Vac

7 Changeover, heat/cool input

8 Measuring neutral (sensors)

9 Remote temperature sensor

D1, Signal input for potential-free

GND operating mode changeover

Figure 13. RDU20U Wiring Diagram.

Figure 14. RDU50U Wiring Diagram.

Figure 15. RDU50.2U Wiring Diagram.

D1, GND Signal input for potential- free operating mode changeover switch

1 0 to 10 Vdc output

2 Heat/cool changeover sensor input

3 Measuring neutral

4 Remote temperature sensor input

5* Ground for control signal

6* Operating voltage, 24 Vac Neg

7 Operating voltage, 24 Vac Pos

* 5 and 6 are connected internally

Dimensions

Figure 16. Controller and Base Plate Dimensions in Inches (Millimeters).

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