Siemens RDU20U User manual

Installation Instructions

Document No. 129-491

October 6, 2009

RDU… and RDX42.22U Room

Temperature Controllers

Item Number 129-491, Rev. BA Page 1 of 7

Product Description

The RDU Series and RDX42.22U Room

Temperature Controller with LCD are designed for

heating and cooling systems.

Product Numbers

RDU20U Floating output, auto changeover

RDU50U Modulating output, auto changeover

RDU50.2U Modulating output, manual changeover

RDX42.22U On/off output, manual changeover

Required Tools

•Small, flat-blade screwdriver

•Wire strippers

•Electric drill

Expected Installation Time

30 minutes

Accessories:

•141-570 Lockable Thermostat Guard

•ARG70 Wall Plate Adapter

•QAH11.1 Remote/Changeover Sensor

Installation

Step 1. Loosen Retaining Screws.

Step 2. Remove Controller Housing.

Step 3. Remove Screw and Open Terminal

Cover. Remove Installation Hardware.

Document No. 129-491

Installation Instructions

October 6, 2009

Page 2 of 7Siemens Industry, Inc.

Installation, Continued

Step 4. Mount Base Plate to Wall.

Step 5. Terminate Wires (See Wiring Diagrams),

Close Cover Terminal Cover and Replace Screw.

Step 6. Set DIP Switches.

Step 7. Replace Controller Housing.

Step 8. Tighten Retaining Screws.

The installation is now complete.

Wiring Diagrams

Figure 1. RDU20U.

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 operating mode

GND changeover

S1 Time clock or switch

Y1 Damper or valve actuator

Document No. 129-491

Installation Instructions

October 6, 2009

Siemens Industry, Inc. Page 3 of 7

Wiring Diagrams, Continued

Figure 2. RDU50U

Figure 3. RDU50.2U

D1, Signal input for potential-

GND 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

6* Operating voltage, 24 Vac

Negative

5* Ground for control signal

7 Operating voltage, 24 Vac Positive

* 5 and 6 are connected internally

Figure 4. RDX42.22U

Four-pipe System Wiring.

Figure 5. RDX42.22U

Heat Pump Wiring.

D1, Signal input for potential- free

GND operating mode changeover

1,2,3 Operating voltage, 24 Vac Negative

4 Operating voltage, 24 Vac Positive

5 Cooling output, NO contact

6 Cooling output, NC contact

7 Auxiliary heating output

8 Measuring neutral remote sensor

9 Remote temperature sensor

(QAH11.1)

10 Heating output, NO contact

11 Heating output, NC contact

12 Fan output at single speed

Figure 6. Heating/Cooling for

RDU50U Only.

Figure 7. Heating/Cooling for

RDU20U Only.

Figure 8.

Document No. 129-491

Installation Instructions

October 6, 2009

Page 4 of 7 Siemens Industry, Inc.

Dimensions

Inches (mm)

Figure 9. Dimensions in Inches (Millimeters).

Operating Instructions

Figure 10. Components.

Normal Operation

The +/- buttons allow you to increase or

decrease the current room temperature

setpoint in steps of 1°F (0.5°C).

To do this, proceed as follows:

•Press or once

The setpoint display starts flashing.

•Press the buttons again to change the

room temperature setpoint.

•The new temperature setpoint will

automatically be stored 10 seconds after

the last adjustment is made. The display

will then stop flashing.

Changing from Heating to Cooling Mode

The Operating Mode Selector on the

RDU50.2U changes the mode from Heating to

Cooling.

Display shows that the heating output is active.

Display shows that the cooling output is active.

Changing from Normal Operation to Energy Saving

Mode

Changeover from normal operation to Energy

Saving mode occurs automatically via an

external contact such as a card access switch,

window contact switch, remote operation

switch, etc.

NOTE: When the RDU50.2U is in Off mode,

this changeover will not occur.

Display shows normal operation.

Display shows Energy Saving mode.

Energy Saving Mode

To change the factory-set temperature setpoints

of 61°F (16°C) for heating and 82°F (28°C) for

cooling, see Changing the Control Parameters.

CAUTION:

The Energy Saving mode setpoint can be set to

Off (the parameter display shows Off), which

could result in freeze conditions.

Document No. 129-491

Installation Instructions

October 6, 2009

Siemens Industry, Inc. Page 5 of 7

DIP Switch Settings

Table 1. RDU20U.

Number

Description

Off

Temp Display

* Room

temperature

Setpoint

Control output

* Floating

ON/OFF

Not used

—

Temperature

scale

Celsius

* Fahrenheit

Table 2. RDU50U/RDU50.2U.

Number Description On Off

LCD

information

*Room

Temperature

Setpoint

DC 0 - 10 V

Output logic

Cooling - DA

Heating - RA

*Cooling - RA

Heating - DA

Not used

—

Temperature

display

Celsius

*Fahrenheit

Table 3. RDX42.22U

Number Description On Off

1 Operating

action of

remote

ON/OFF switch

* Changeover

activated

when switch

is closed

(NO)

Changeover

activated

when switch

is open (NC)

Auxiliary

heating

function

* No auxiliary

heater

connected

Auxiliary

heater

connected

Temperature/

setpoint display

* Room

temperature

Temperature

setpoint

4 Temperature

display

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)

Normal operation mode

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.

Document No. 129-491

Installation Instructions

October 6, 2009

Page 6 of 7 Siemens Industry, Inc.

Table 4. RDX42.22U Control Parameters.

Parameter Meaning Setting Range Factory

Setting

P01 Heating setpoint in Energy Saving

mode (operating mode changeover

switch activated)

OFF, 46°F to 64.5°F (8°C to 18°C) (in

increments of 1°F) 61°F (16°C)

P02 Cooling setpoint in Energy Saving

mode (operating mode changeover

switch activated)

OFF, 75°F to 95°F (24°C to 35°C) (in

increments of 1°F) 82.5°F

(28°C)

P03 Minimum setpoint in Normal mode 46°F to 68°F (8°C to 20°C) (in

increments of 2°F) 46°F (8°C)

P04 Maximum setpoint in Normal mode 70°F to 95°F (21°C to 35°C) (in

increments of 2°F) 95°F (35°C)

P05 Minimum compressor off-time 1 to 10 minutes (in increments of

1 min) 3 min

P06 Minimum compressor on-time 1 to 10 minutes (in increments of

1 min) 1 min

P07 Auxiliary heater minimum hold time 1 to 10 minutes (in increments of

1 min) 1 min

P08 Fan overrun after auxiliary heater off 30 to 300 seconds (in increments of

10 seconds) 30 s.

P09 Sensor calibration –3 to 3 K (in increments of 0.5 K)

(0.5 K = °F) 0 K

P10 Switching differential in heating mode 0.5 to 4 K (in increments of 0.5 K)

(0.5 K = °F) 2 K

P11 Switching differential in cooling mode 0.5 to 4 K (in increments of 0.5 K)

(0.5 K = °F) 1 K

P12 Setpoint differential between heating

and auxiliary heating WD0.5 to 5 K (in increments of 0.5 K)

(0.5 K = °F) 2 K

P13 Value of current room temperature No setting, display only —

P14 Active temperature sensor (display

only, no setting choices) 1: Room temperature sensor active

2: Return temperature sensor active —

Document No. 129-491

Installation Instructions

October 6, 2009

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. Teflon is a registered

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. 129-491

Printed in the USA

Page 7 of 7

Table 5. Commissioning (by Qualified HVAC Installer).

Para-

meter Controller’s parameter factory settings:

Setting range

(all settings can be made in increments of 1°F (or 0.5 K) RDU20U RDU50U RDU50.2U

P01

Setpoint of heating in Energy Saving mode

(operating mode changeover switch activated)

61°F (16°C) OFF, 41°F to 64°F (OFF, 5°C to 18°C)

P02

Setpoint of cooling in Energy Saving mode

(operating mode changeover switch activated)

82°F (28°C) OFF, 75°F to 95°F (OFF, 24°C to 35°C)

P03 Minimum setpoint limitation in Normal mode 41°F (5°C) 41°F to 68°F (5°C to 20°C)

P04 Maximum setpoint limitation in Normal mode 95°F (35°C) 70°F to 95°F (21°C to 35°C)

P05 Heat-cool changeover switching point cooling 61°F (16°C) 50°F to 77°F (10°C to 25°C)

P06

Heat-cool changeover switching point heating

82°F (28

81°F to 104°F (27

C to 40

P07 Sensor calibration 0K -3K to 3 K (1 Kelvin = 2°F)

P08

P-band in Heating mode 2K 0.5K to 4 K (1 Kelvin = 2°F)

P09 P-band in Cooling mode 1K 0.5K to 4 K (1 Kelvin = 2°F)

P10 Integral action time 5 min 1 to 10 min (increments of 1 min)

P11 Minimum output limitation in Cooling mode (normal operation) 0% 0 to100% (increments of 10%)

Actuator run time 150 s 50 to 150 s ( in increments of 10 s)

X X

P12 Active temperature sensor (no setting, display only) - 1: room temperature sensor active

2: return air temperature sensor active

P13 Value of current room temperature reading (no setting, display only) - 32°F to 120°F (0°C to 49°C) = current temperature value

P14 Value of current heat-cool changeover temperature reading including indication of

current mode ( ,) (no setting, display only) -

100 = input open (no sensor connected, Heating mode

[})

32°F to 120°F (0°C to 49°C) = current temperature value

00 = input bridged, Cooling mode ( )

P15 Test mode for checking actuator direction

“---“ = Output Y1 and Y2 Off

“OPE” = Output Y1 forced open

“CLO” = Output Y2 forced open

X X

Legend to Commissioning Table

Adjustable; record all changes you make

Not adjustable/display only

X Not adjustable/no display

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