Siemens RDF30U Betriebsanleitung

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

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 (3.6F) in Heating mode (adjustable in Parameter 10)

and 1 K (1.8F) 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

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".

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.

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,

41F to 68F (5C to 20C) (in increments

of 0.5 K)

61F

(16C)

P02

Cooling setpoint in Economy mode

(operating mode changeover contact activated )

OFF,

70F to 95F (21C to 35C) (in

increments of 0.5 K)

82F

(28C)

P03

Heating setpoint in Standby “ ”

OFF,

41F to 68F (5C to 20C) (in increments

of 0.5 K)

46F

(8C)

P04

Cooling setpoint in Standby “ ”

OFF,

70F to 95F (21C to 35C) (in

increments of 0.5 K)

OFF

P05

Minimum setpoint limitation in Normal mode

41F to 68F (5C to 20C) (in increments

of 0.5 K)

41F

(5°C)

P06

Maximum setpoint limitation in Normal mode

70F to 95F (21C to 35C) (in

increments of 0.5 K)

95F

(35°C)

P09

Sensor calibration

-3 K to 3 K (-5.4F to 5.4F) (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 = 1.8F.

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 = 1.8F.

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)

32F to 120F (0C to 49C) = 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

0.5K to 5K (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

P23

Display unit of measure

°F, °C

°F

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.

Display of the room temperature, setpoints or control parameters

Symbol used when displaying the current room temperature

Normal mode

Economy mode

Cooling valve open

Fan on

Heating valve open

Buttons for adjusting the setpoints and the control parameters

Operating mode selector

(Standby “ ”, Heating or Cooling mode with manual selection of fan speed)

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

Fan control

Fan control is temperature-

independent in Normal mode

Fan control is temperature-

dependent in all operating

modes

Display of temperature or setpoint

Room (or return air) temperature

display

Setpoint display

Operating action of switch for external

operating mode changeover

Changeover activated when switch is

closed

Changeover activated when

switch is open

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.

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

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

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.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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