Siemens RDX42.22U Owner's manual

RDX42.22U

Technical Instructions

Document No. 155-747

March 13, 2008

Room Temperature Controller

with LCD

Siemens Industry, Inc.

Description Controller for heat pump systems with reversing valve, optional electric heater, one- or

two-stage heating and one-stage cooling.

Features •Outputs for one-stage compressor and reversing valve or on/off valve actuators

•Output for auxiliary electric heating

•Output for a one-speed fan

•Room or return air temperature control

•Manual heating/cooling changeover

•Operating modes: Normal (heating, cooling), Energy Saving, Off

•Operating mode changeover input for remote control

•Selectable installation and control parameters

•Operating voltage 24 Vac

Application •For control of heat pump systems with reversing valve, optional electric heater, one-

or two-stage heating and one-stage cooling

•For control of room temperature in individual rooms that are heated or cooled with

four-pipe fan coil units and optional electric heating

•For opening and closing a valve

•For switching a one-speed fan

Product Number RDX42.22U

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

QAH11.1 Changeover/Remote Temperature Sensor

141-570 Lockable Thermostat Guard

Ordering The QAH11.1 temperature sensor (can also be used as a return air temperature

sensor) and the zone valves must be ordered separately.

Technical Instructions RDX42.22U Room Temperature Controller with LCD

Document Number 155-747

March 13, 2008

Page 2 Siemens Industry, Inc.

Table 1Equipment Combinations.

Product Number Description Technical

Instructions

SFA/SFP Series

Zone valve actuators

155-321P25

599 Series Zone Valves

Zone valve bodies

155-320P25

GDE16… 44 lb-in NSR air damper

actuators

155-187P25

GLB16… 88 lb-in NSR air damper

actuators

155-187P25

Temperature Sensor QAH11.1 155-329P25

Functions The controller acquires the room temperature with its integrated sensor or via a return

air temperature sensor (QAH11.1) and maintains the setpoint by delivering two-position

control commands. The switching differential is 4°F (2°K) in heating mode (adjustable)

and 2°F (1°K) in cooling mode (adjustable).

Fan Operation Fan operation is selected on the controller’s front panel, either in "Auto” or “Fan On”

mode.

When function "(Auto) – temperature-dependent" is selected, the fan is switched on/off

(one-speed) depending on the temperature and the control output. When function “Fan

On” is selected, the fan will run continuously (one-speed).

The fan is switched off by:

•leaving the heating or cooling sequence, if the “Temperature-dependent fan control“

function is activated.

•manually setting the “Heat-Off-Cool” selector to “Off”.

•turning the controller’s power supply off.

Fan overrun When DIP switch 2 is set to OFF, the auxiliary heater is connected, the controller is in

heating mode, and the fan overrun function is activated. When the electric heater

output (terminal 7) is switched off by the controller in the heating sequence, the fan

overrun will start based on the time delay set with parameter P08. Fan overrun has the

highest priority and overrides the controller’s Off position.

RDX42.22U Room Temperature Controller with LCD Technical Instructions

Document Number 155-747

March 13, 2008

Siemens Industry, Inc. Page 3

Heating Mode The system will switch to Heating mode when the operating mode selector, on the front

of the unit, is set to Heat.

The heating equipment receives the On command via control output terminal 10 when

the following conditions are met:

1. The measured room temperature is half the switching differential below the

setpoint, and

2. The heating output has been off for more than three minutes (adjustable).

The auxiliary heating equipment receives the On command via control output terminal 7

when these conditions exist:

1. Heating output terminal 10 is activated, and

2. The measured room temperature is below the setpoint differential between heating

and auxiliary heating(adjustable with parameter P12).

Off

The heating equipment receives the Off command via control output terminal 10 when

the following conditions are met:

1. The measured room temperature is half the switching differential above the setpoint,

and

2. The heating output has been on for more than one minute (adjustable, see

Parameters).

The auxiliary heating equipment receives the off command via control output terminal 7

when:

1. The measured room temperature is above the setpoint differential between

heating and auxiliary heating (WD) (adjustable with parameters P12), and

2. The auxiliary heating output has been on for more than one minute (adjustable, see

Parameters).

Cooling Mode

When the operating mode selector is set to Cool, the system will switch to cooling

mode.

The cooling equipment receives the On command via control output terminal 5 when

the following conditions occur:

1. The measured room temperature is half the switching differential above the

setpoint, and

2. The cooling output has been off for more than three minutes (adjustable, see

Parameters.)

Off The cooling equipment receives the Off command via control output terminal 5 when

these conditions are met:

1. The measured room temperature is half the switching differential below the setpoint,

and

2. The cooling output has been on for more than one minute (adjustable, see

Parameters).

Return air temperature

The RDX42.22U provides control based on room temperature or return air temperature.

It detects if a QAH11.1 cable temperature sensor is connected to input terminals 9 and

8, and then operates automatically according to the return air temperature.

Technical Instructions RDX42.22U Room Temperature Controller with LCD

Document Number 155-747

March 13, 2008

Page 4 Siemens Industry, Inc.

Operating Modes

Normal

The following operating modes are available:

Heating or cooling mode with selected fan operation (Auto or continuous on). In Normal

operation, the controller maintains the adjusted setpoint. (See Operation Diagram).

Energy Saving A changeover switch can be connected to status input D1-GND, located on the lower

left side of the base plate, below the main terminal block. When the switch closes (due

to an open window, for example), the operating mode will change from Normal

operation to Energy Saving mode. In that case, the relevant setpoints of heating or

cooling are maintained (setting of control parameters P01 and P02). The operating

action of the switch (NC or NO) can be selected.

Off When the operating mode selector is set to Off, the system will switch to Off mode. In

this mode, the system does not activate any output. The display only shows the room

temperature, or normal mode setpoint, according to the DIP switch setting table.

After a single press of the +or –button, the display shows the Normal mode setpoint.

When the operating mode selector is set to Off, the system will stay in Off mode.

Operation Diagrams

(Normal Mode)

NOTE: Changed

"Actuator" to "Valve" in

illustration.

Figure 1. Operation Diagrams.

Mechanical Design The unit consists of two parts:

•The plastic housing which accommodates the electronics, the operating elements

and the built-in room temperature sensor, and

•The baseplate, which houses the wire terminations.

The housing engages in the baseplate and is secured with two screws.

The baseplate carries the screw terminals. The DIP switches are located at the rear of

the housing.

RDX42.22U Room Temperature Controller with LCD Technical Instructions

Document Number 155-747

March 13, 2008

Siemens Industry, Inc. Page 5

Setting and

Operating Elements

Figure 2.

1. Display of the room temperature (in degrees Fahrenheit or Celsius), setpoints or

control parameters

2. Symbol used when displaying the current room temperature

3. Normal operation

4. Energy Saving mode

5. Cooling on

6. Fan on

7. Heating on

Heating and auxiliary heating on

AUX

8. Buttons for adjusting the setpoints and setting the control parameters

9. Operating mode selector (Heat, Off, Cool)

10. Fan control

(Auto: Controller switches fan on when heating or cooling output is active)

(Fan On: Fan is constantly running)

Table 2. DIP Switch Table.

DIP

Switch Function Position OFF Position ON

1 Operating action of remote

ON/OFF switch Changeover activated when

switch is open (NC) Changeover activated when

switch is closed (NO) *

2 Auxiliary heating function Auxiliary heater connected No auxiliary heater connected *

3 Temperature/setpoint display Temperature setpoint Room temperature *

4 Temperature display Degrees Fahrenheit * Degrees Celsius

* Factory setting

Technical Instructions RDX42.22U Room Temperature Controller with LCD

Document Number 155-747

March 13, 2008

Page 6 Siemens Industry, Inc.

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. In the event of

power failure, all control parameter settings set will be maintained.

Settings The parameters can be changed as follows;

1. Press the +and –buttons simultaneously for three seconds. Release them and,

within two seconds, press the +button again for three seconds. Then, the display

will show “P01“.

2. Select the required parameter by repeatedly pressing the + and - buttons:

006_RDX42_01

P01 P02 P13 P14

+- +-+

- -

3. By pressing the + and – buttons simultaneously, the current value of the selected

parameter appears, which can be changed by repeatedly pressing the + and –

buttons. To exit from the individual parameter setting mode, press the + and –

buttons simultaneously again and the parameter mode setting number will be

displayed “Pxx”. You can now choose another parameter mode number setting.

4. By pressing the + and – buttons simultaneously again, or five seconds after the last

press of a button, the last parameter will be displayed again.

5. If you wish to display and change additional parameters, repeat steps 2 through 4.

6. Wait 10 seconds after the last display or setting, all changes are stored and the

controller returns to Normal mode.

P13 and P14

(Display only, no

setting)

P13 shows the room temperature and the sensor being used by the device to calculate the

output.

P14 displays the current value of the temperature sensor connected.

1: Internal sensor

2: External sensor. No settings

If the position of the operating mode selector or remote ON/OFF switch is changed in this

parameter setting mode, the device will abort the setting mode and respond to the new

input after 10 seconds. The data changes are saved.

RDX42.22U Room Temperature Controller with LCD Technical Instructions

Document Number 155-747

March 13, 2008

Siemens Industry, Inc. Page 7

Table 3. 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 —

Technical Instructions RDX42.22U Room Temperature Controller with LCD

Document Number 155-747

March 13, 2008

Page 8 Siemens Industry, Inc.

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 3.)

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

(See Figure 3.)

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

Figure 3. Acceptable Mounting Locations.

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

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

See Figure 4.

Figure 4. Accessing the Wire Terminal Block.

•Sensor inputs 9-8 carry 24 Vac potential. If the sensor's cables must be extended, they

must be suited for 24 Vac voltage.

•Complete installation instructions are included with the controller.

Calibrating the

Sensor If the room temperature displayed by the controller is inconsistent with the room

temperature effectively measured, the temperature sensor can be recalibrated. In that

case, parameter P09 must be changed.

RDX42.22U Room Temperature Controller with LCD Technical Instructions

Document Number 155-747

March 13, 2008

Siemens Industry, Inc. Page 9

Specifications

Power Supply

Operating voltage 24 Vac + 20%

Frequency 50/60 Hz

Power consumption Maximum 6 VA

Control output FAN 24 Vac

Rating Maximum 5(3)A

Control outputs COOLING and HEATING 24 Vac

Rating Maximum 5(3)A

Control output AUX. HEATING 24 Vac

Rating Maximum 5(3)A

Remote temperature sensor status input 8-7 QAH11.1 safety class II

NTC resistor 3 k ohm at 77°F (25°C)

Status input D1 and GND

Operating action selectable Normal open (NO)

Contact sensing Normal closed (NC)

Insulation against line voltage SELV 6 to 15 Vdc/3 to 6 mA, 4kV

reinforced insulation

Permissible cable length with copper cable 262 ft (80 m)

2 × 16 AWG or 1 × 14 AWG for connection to

terminals 8 and D1

Operational data

Setpoint setting range 46°F to 95°F (8°C to 35°C)

Control deviation at 77°F (25°C) Maximum + 1°F (0.5 K)

Setting Range Factory Setting

Switching differential in heating mode (adj) 1°F to 7°F 3.5°F (2 K)

Switching differential in cooling mode (adj) 1°F to 7°F 2°F (1 K)

Setpoint differential WD(adjustable) 1°F to 9°F 3.5°F (2 K)

Setpoint (Energy Saving Mode ), heating 46°F to 64°F 61°(16°C)

Setpoint (Energy Saving Mode ), cooling 75°F to 95°F 82.5°F (28°C)

Environmental

Conditions

Operation

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

Humidity <95% rh

Shipping and storage

Temperature –13°F to 158°F (–25°C to 70°C)

Humidity <95% rh

Agency Approvals

Conforms to CE requirements

NEMA 1

General Connection terminals Use solid wires or prepared stranded

wires. 22 AWG to 14 AWG

Weight 0.5 lb (0.225 kg)

Housing cover color White

Technical Instructions RDX42.22U Room Temperature Controller with LCD

Document Number 155-747

March 13, 2008

Page 10 Siemens Industry, Inc.

Wiring Terminals

Figure 5. Wiring.

1,2,3 Operating voltage, 24 Vac Neg

4 Operating voltage, 24 Vac Pos

5 Cooling output, NO contact

6 Cooling output, NC contact

7 Auxiliary heating output

8Measuring 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

D1, GND Signal input for potential- free

operating mode changeover

Wiring Diagrams

Figure 6. Four-pipe System Wiring.

Figure 7. Heat Pump Wiring.

6 Cooling output NC contact

5 Cooling output NO contact

11 Heating output NC contact

10 Heating output NO contact

6 Cooling output NC contact for

reversing valve

5 Cooling output NO contact for

compressor

11 Heating output NC contact for

reversing valve

10 Heating output NO contact for

compressor

NOTE: Outputs 5 and 10 must be wired

together for compressor control

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