Siemens RDU340 Series Operator's manual

s
Flush-mounted room temperature controllers for
VAV / CAV applications, with LCD
RDU340
Basic Documentation
Edition: 3.0
CE1P3078en
2014-11-03 Building Technologies

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Building Technologies Table of contents 2014-11-03
Table of contents
1About this document...........................................................................4
1.1 Revision history.....................................................................................4
1.2 Reference documents............................................................................4
1.3 Before you start .....................................................................................4
1.3.1 Copyright...............................................................................................4
1.3.2 Quality assurance..................................................................................4
2Summary..............................................................................................5
2.1 Brief description.....................................................................................5
2.2 Features................................................................................................5
2.3 Type summary.......................................................................................5
2.4 Equipment combinations........................................................................6
2.5 Accessories...........................................................................................7
2.6 Ordering................................................................................................7
3Use .......................................................................................................7
4Functions.............................................................................................8
4.1 Temperature control...............................................................................8
4.2 Operating modes...................................................................................9
4.3 Setpoints .............................................................................................10
4.4 Applications.........................................................................................11
4.5 Additional features...............................................................................12
4.6 Control sequences...............................................................................14
4.6.1 Single duct...........................................................................................14
4.6.2 Single duct with electrical heater..........................................................16
4.7 Control output......................................................................................17
4.8 Multifunctional input.............................................................................18
4.9 Error handling......................................................................................19
4.10 DIP switches........................................................................................19
4.11 Control parameters..............................................................................20
5Handling.............................................................................................23
5.1 Mounting and installation .....................................................................23
5.2 Operating Instructions..........................................................................24
5.3 Disposal ..............................................................................................24
6Engineering........................................................................................25
6.1 Connection terminals...........................................................................25
6.2 Connection diagrams...........................................................................25
7 Mechanical design.............................................................................26
7.1 Dimensions..........................................................................................27
8Technical data....................................................................................28

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Building Technologies About this document 2014-11-03
1 About this document
1.1 Revision history
Edition Date Changes Section Pages
3.0 2014-10-21 Update for RoHS 2.0 and
overcurrent protection and other
minor changes
5.1
5.3
6.2
8
23
24
25
28
2.0 2014-09-04 Update P51
Mounting and wiring information
Date format changed in line with
ISO 8601 specifications (yyyy-mm-
dd format).
1.0 2008-07-11 First edition
1.2 Reference documents
Ref. Document title Type of document Document No.
N3078 Flush-mounted room temperature
controllers with LCD Datasheet CE1N3078en
B3076 Operating Instructions CE1B3076en
M3078 Mounting Instructions CE1M3078xx
1.3 Before you start
1.3.1 Copyright
This document may be duplicated and distributed only with the express permission
of Siemens, and may be passed only to authorized persons or companies with the
required technical knowledge.
1.3.2 Quality assurance
These documents have been prepared with great care.
·The contents of all documents are checked at regular intervals.
·Any corrections necessary are included in subsequent versions.
·Documents are automatically amended as a consequence of modifications and
corrections to the products described.
Please ensure that you are aware of the latest revision date of the documentation.
If you find any lack of clarity while using this document, or if you have any criticisms
or suggestions, please contact the product manager in your nearest branch office,
or write directly to the support team at Headquarters in Zug (see below).
Support address:
Siemens Switzerland Ltd.
Building Technologies Group
International Headquarters
Field Support 5500
Gubelstrasse 22
6301 Zug, Switzerland
Tel. [phone]
Fax. [phone]
E-mail: [e-mail]

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Building Technologies Summary 2014-11-03
2 Summary
2.1 Brief description
The devices support VAV heating and cooling systems:
·Modulating PI / P control
·Control depending on the room or the return air temperature
·Output for a DC 0…10 V actuator and AC 230V electrical heater (ON-OFF)
·Automatic or manual heating/cooling changeover
·Operating modes: Comfort, Energy Saving and Protection
·Two multifunctional inputs for keycard contact, external sensor, etc.
·Adjustable commissioning and control parameters
·Minimum and maximum setpoint limitation
·Adjustable minimum and maximum limitation of output signal DC 0..10V
·Output signal inversion as an option
·Mounting on recessed rectangular conduit box, 60.3 mm fixing centers
·AC 24 V operating voltage
2.2 Features
·Maintain room temperature via built-in temperature sensor external room
temperature / return air temperature sensor
·Automatic or manual changeover between heating and cooling mode
·Select applications via DIP switches
·Select operating mode via the operating mode button on the controller
·Display current room temperature or setpoint in °C and/or °F
·Minimum and maximum setpoint limitation
·Key lock (automatic and manual)
·Two multifunctional inputs, freely selectable for:
– Operating mode switchover contact (key card)
– Automatic heating/cooling changeover sensor
– External room temperature or return air temperature
– Dewpoint sensor
– Electric heater enable
– Alarm input
·Minimum and maximum limitation of air flow signal DC 0..10V
·Floor heating temperature limit
·Reload factory settings for commissioning and control parameters
2.3 Type summary
Product
number Operating Voltage
Control output
LCD Backlight Infrared receiver Housing Colour r
3 pt on/off DC 0..10 V
RDU340 AC 24 V -- ü ü white

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2.4 Equipment combinations
Type of unit Product number Data sheet
Cable temperature sensor or
changeover sensor,
cable length 2.5 m
NTC (3 kWat 25 °C)
QAH11.1 1840
Room temperature sensor
NTC (3 kWat 25 °C) QAA32 1747
Electrical actuator, DC 0..10V
(for radiator valve) SSA61... 4893
Electrical actuator, DC 0...10 V
(for 2- and 3-port valves / V…P45) SSC61… 4895
Electrical actuator, DC 0..10V
(for small valve 2,5 mm) SSP61… 4864
Electrical actuator, DC 0..10V
(for small valves 5.5 mm) SSB61... 4891
Electrical actuator, DC 0...10 V
(for CombiValves VPI45) SSD61... 4861
Electromotoric actuator, DC 0..10V
(for valves 5.5 mm) SQS65… 4573
Electrothermal actuator,
AC 24 V, NC, DC 0…10 V, 2 m
(for radiator valves and small valve
2.5 mm)
STA63 4884
Electrothermal actuator,
AC 24 V, NO, DC 0…10 V, 2 m
(for radiator valves and small valve
2.5 mm)
STP63 4884
DC 0…10 V damper actuator
GQD161… 4605
GDB161… 4634
GLB161…
GMA161… 4614
GEB161… 4621
GCA161… 4613
GBB161… 4626
GIB161…
VAV compact controller GDB181.1E/3 3544
GLB181.1E/3
*) The documents can be downloaded from http://siemens.com/bt/download.
DC 0..10 V actuators

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2.5 Accessories
Designation Product no. Data Sheet
*)
Changeover mounting kit (50 pcs/package) ARG86.3 N3009
Plastic mounting spacer for flush mounted
thermostats for increasing the headroom in the
conduit box by 10 mm ARG70.3 N3009
Conduit box for flush mounted thermostat ARG71 /
S55770-T137 N3009
*) The documents can be downloaded from http://siemens.com/bt/download.
2.6 Ordering
When ordering, indicate both product number and name:
E.g. RDU340 room temperature controller
Order valve actuators separately.
3 Use
Control of the room temperature in individual rooms of ventilation or air
conditioning plants that are:
·Heated or cooled by single duct.
·Heated and cooled by single duct with auxiliary electrical heater.
The RDU340 is suitable for use with VAV systems in connection with the VAV
compact controllers types G…B181.1E/3.
The RDU340 controls
·One DC 0…10 V actuator
·One DC 0…10 V actuator and AC 230V 1-stage electrical heater
Use in systems with:
·Heating or cooling mode
·Automatic heating/cooling changeover
·Manual heating/cooling changeover
·Heating and cooling (single duct with electrical heater)

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4 Functions
4.1 Temperature control
The setting of the control parameters (P01 etc., mentioned throughout the
document) is described in section 4.11.
The controller acquires the room temperature via built-in sensor, external room
temperature sensor (QAA32), or external return air temperature sensor (QAH11.1),
and maintains the setpoint by issuing actuator control commands to heating and/or
cooling equipment. The following control outputs are available:
·Modulating PI / P control with DC 0..10 V control output for actuators and ON-
OFF for electrical heater.
The switching differential or proportional band is 2 K for heating mode and 1 K for
cooling mode (adjustable via parameters P30 and P31).
The integral action time for continuous PI control is 5 minutes (adjustable via
parameter P35).
The display shows the acquired room temperature or the setpoint for the current
operating mode, selectable via parameter P06. The factory setting displays the
current room temperature.
Use parameter P04 to display the room temperature or setpoint in °F rather than
°C as needed.
If the controller is used in a system with manual heating/cooling changeover
(P01=2), the heating and cooling symbols on the display show the terminal
unit status. Thus, the symbols are displayed even when the controller operates in
the neutral zone. For all other cases, the heating and cooling symbols are
displayed when the heating or cooling output is energized.
Concurrent display of the current temperature or setpoint in °C and in °F
(parameter P07) is possible on the controller without weekly time program.
General note
Display
/
Concurrent display of
°C and °F

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4.2 Operating modes
Select the controller's operating mode via operating mode button on the
controller or operating mode input (e.g. keycard occupancy sensor, when X1 or X2
set to 3 (P38, P40)). A corresponding setpoint is used to maintain the room
temperature at the desired level depending on the active operating mode. The
following operating modes are available:
In Comfort mode, the controller maintains the setpoint which can be adjusted via
the +/- buttons.
Energy Saving mode helps save energy. Select it by pressing the operating mode
button if parameter P02 is set accordingly, or if the external operating mode
switchover contact is active (e.g. window contact).
If the external operating mode switchover contact is active, user operations are
ineffective and “OFF” is displayed. Control will then be according to energy saving
setpoints (P11 and P12).
In Standby mode, the system is
– protected against frost (factory setting 8 °C, can be disabled or changed via P65).
– protected against overheating (factory setting OFF, can be enabled or changed
via P66)
Comfort mode
Energy Saving
Note
Standby
/Protection mode

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4.3 Setpoints
The setpoint in Comfort mode can be adjusted via the +/- buttons.
For energy saving purposes, the setpoint adjusting range can be limited to
minimum (P09) and maximum (P10).
·If the minimum limit P09 is set lower than the maximum limit P10, both heating
and cooling are adjustable between these two limits.
·For heating or cooling applications (e.g. single duct)
– The setting range in cooling mode is from P09…40° instead of 5…40°
– The setting range in heating mode is from 5…P10° instead of 5…40°
·For cooling and heating with el. heater applications (e.g. single duct)
– The setting range is from P09…40° instead of 5…40°
– The setpoint for the el. heater is maximal limited by P10
Examples Single duct heating or cooling Single duct cooling with el heater
P09 < P10
Cooling setpoint adjustable 18…25°C
Heating setpoint adjustable 18…25°C Setpoint adjustable 18…25°C Heating setpoint := Cooling setpoint –
dead zone
P09 ≥P10
Cooling settable 25…40°C
Heating settable 5…21°C Setpoint adjustable 25…40°C Heating setpoint := Cooling setpoint –
dead zone, but max (limited by) P10
If the “Temporary setpoint function” is enabled via parameter P69, the setpoint
adjusted via the +/- buttons is set back to the Comfort basic setpoint when the
operating mode changes.
The factory setting for the Comfort basic setpoint is 21 °C and can be changed via
parameter P08.
Use control parameters P11 and P12 to adjust the Economy mode setpoints.
The heating setpoint is factory-set to 15 °C and to 30 °C for cooling.
Use control parameters P65 and P66 to adjust the Standby mode setpoints.
The heating setpoint is factory-set to 8 °C (frost protection) and to OFF for cooling.
If a setpoint is set to OFF (P65, P66), the controller does not maintain the setpoint
in the corresponding mode (heating or cooling).
This means no protective heating or cooling function and thus risk of frost in the
heating mode or risk of overheat in cooling mode!
Comfort mode
Setpoint limitation
P09 < P10
P09 ≥P10
Temporary setpoint
Energy Saving
mode
Standby mode
Caution

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4.4 Applications
The controller supports following applications, which can be configured by DIP
switches on the inner side of the controller front panel.
Application and output signal, DIP switches, diagram
Single duct,
heating or cooling
Modulating, DC 0…10 V output signal normal
1
ON
2
Single duct,
heating or cooling
Modulating, DC 0…10 V output signal
inverted
1
ON
2
Y10
M
V
B1
B2
Single duct with electrical heater,
cooling and heating, with auxiliary heater
Modulating, DC 0…10 V output signal
normal
Note: on-off electrical heater
1
ON
2
Single duct with electrical heater,
cooling and heating, with auxiliary heater
DC 0…10 V output signal inverted
Note: on-off electrical heater
1
ON
2
Y10
MV Y21
B1
V1 Heating or heating / cooling valve actuator B1 Return air temperature sensor or external room
temperature sensor (optional)
E1 Electric heater B2 Changeover sensor (optional)

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4.5 Additional features
The air or water temperature acquired by the changeover sensor (QAH11.1) is
used to change over from heating to cooling mode and vice-versa. When the water
temperature is above 28 °C (parameter P37), the controller changes over to
heating mode, and to cooling mode when below 16 °C (parameter P36). If the
water temperature is between the 2 changeover points immediately after power up,
the controller starts in heating mode. The water temperature is acquired at 30-
second intervals and the operating state is updated accordingly.
M Operating mode Cooling mode
TwAir or water temperature Heating mode
The QAH11.1 cable temperature sensor for automatic heating/cooling changeover
can be replaced by an external switch for manual, remote changeover:
Contact open àheating mode
Contact closed àcooling mode
The sensor or switch can be connected to the input terminal of X2 (factory setting)
or X1 depending on the commissioning of inputs X1 and X2. See also section
“Multifunctional input”.
The controller acquires the room temperature via built-in sensor, external room
temperature sensor (QAA32), or external return air temperature sensor (QAH11.1)
connected to multifunctional input X1 or X2.
Inputs X1 or X2 need to be commissioned accordingly. See section 4.8 “Multi-
functional input”.
Dewpoint monitoring is essential to prevent condensation on the chilled ceiling and
help avoid associated damage to the building. This is an optional function and is
provided in case the controller is used for a chilled ceiling application.
A dewpoint sensor with a voltage-free contact is connected to multifunctional input
X1 or X2. If there is condensation, the cooling valve is fully closed until no more
condensation is detected and the cooling output is disabled temporarily. The
condensation symbol is displayed during temporary override.
Input X1 or X2 must be commissioned accordingly.
See section “4.8 Multifunctional input”.
If the key lock function is enabled by parameter P14, then pressing 7 seconds on
the operating mode button , the keypad will be locked or unlocked respectively.
If “Auto lock” is configured, then the controller will automatically lock the keypad
after 30 seconds of the last adjustment.
Automatic H/C
changeover
Remote heating/
cooling changeover
External/return
temperature sensor
Dewpoint monitoring
Key lock
Min / Max air flow

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The output signal of the air flow (DC 0..10V) can be limited to a minimum value by
using parameter P63 and to a maximum value using parameter P64. These air flow
limitation values can be set between 0% and 100%.
This is used to ensure a minimum or maximum supply air volume.
TRoom temperature
Y10 Control output
WRoom temperature setpoint
XpH Proportional band Heating
XpC Proportional band Cooling
Vmin Minimum limitation air flow
Vmax Maximum limitation air flow
The output signals DC 0…10V can be inverted by means of DIP switch #2.
– If DIP switch #2 is set to “OFF”, 0V corresponds to 0% travel and 10V to 100%
(factory settting).
– In position ON, 0V corresponds to 100% travel and 10V to 0% travel.
This function is useful in conjunction with normally open valves.
The floor temperature should be limited for 2 reasons: Comfort and protection of
the floor.
The floor temperature sensor, connected to multifunctional input X1, acquires the
floor temperature. If the floor temperature exceeds the parameterized limit
(parameter P51), the heating valve is fully closed until the floor temperature drops
to a level 2 K below the parameterized limit.
This function is factory-set to OFF (disabled).
Input X1 or X2 must be commissioned accordingly (P38 = 1).
See section 4.8“Multifunctional input”.
Living rooms:
Up to 26 °C for long-time presence, up to 28 °C for short-time presence.
Bath rooms:
Up to 28 °C for long-time presence, up to 30 °C for short-time presence.
The table below shows the relation between parameter, temperature source and
temperature display:
Parameter P51 External temp.
sensor available Source for display of room temperature Output control according to Floor temp. limit. function
OFF No Built-in sensor Built-in sensor Not active
OFF Yes External temp. sensor External temp. sensor Not active
10...50 ˚CNo Built-in sensor Built-in sensor Not active
10…50 ˚C Yes Built-in sensor Built-in sensor + limit
by external sensor Active
Output signal inversion
Floor temperature
limitation function
Recommended values
for P51:

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4.6 Control sequences
4.6.1 Single duct
If the selected application is "single duct", then the controller can be used in
systems featuring:
– Heating or cooling mode (P01=0 or P01=1).
– Manual heating/cooling changeover (P01=2).
– Automatic heating/cooling changeover (P01=3).
The relevant modes can be adjusted via commissioning parameter “Control
sequence” P01, depending on the selected application.
Sequence
Parameter P01 = 0 P01 = 1 P01 = 2 P01 = 3
Mode
Available for:
Heating mode Cooling mode Manually select
heating or cooling
mode
Automatic
heating/cooling
changeover via
external water
temperature
sensor or remote
switch
Single duct ü ü ü ü
In application "Single duct with el. heater", the controller operates in heating AND
cooling mode.
In single duct applications, the controller controls an actuator (valve, damper, VAV
system, etc)
– in heating/cooling mode with changeover (automatic or manual),
– heating only mode,
– or cooling only mode.
Cooling only is factory set (P01=1).
The output can be limited to a minimum and maximum value if required.
See section 4.5 "additional features".
The diagram below shows the control sequence for continuous PI control.
Heating only mode Cooling only mode
Changeover
Single duct,
heating or cooling
Control sequence
modulating output

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T[°C] Room temperature
wRoom temperature setpoint
Y10 Control command “Valve”
XpH Proportional band “Heating”
XpC Proportional band “Cooling”
Vmin Min. limitation for output
Vmax Max. limitation for output
The diagrams show the PI controller’s proportional part only
Note

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4.6.2 Single duct with electrical heater
If the selected application is "single duct & el. heater", then the controller works in
heating and cooling mode.
The output can be limited to a minimum and maximum value if required.
See section 4.5 "additional features".
In single duct applications with electrical heater, the controller controls an actuator
(valve, damper, VAV system, etc.) plus an auxiliary electrical heater.
Note: The setpoint for the electrical heater is limited by parameter “Maximum
heating setpoint” (P10).
Remote enabling/disabling of the electrical heater is possible via digital input X1/X2
for tariff regulations, energy saving etc.
Input X1 or X2 must be commissioned accordingly. See section “4.9 Multifunctional
input”.
The diagram below shows the control sequence for continuous PI control.
Cooling and heating with electric heater
TR[°C] Room temperature Vmin Min. limitation for output
WRoom temperature setpoint Vmax Max. limitation for output
Y10 Control command “actuator” XpC Proportional band “Cooling”
Y21 Control command “electrical heater” Xdz Dead zone
SDH Switching differential
Note: The diagrams show the PI controller's proportional part only.
Single duct
with el. heater
Digital input “Enable
electrical heater”
Control sequence

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4.7 Control output
Different control output signals are available depending on the controller type.
Control output
Type reference
on/off 3-position DC 0…10 V
RDU340 Y21 (1) -- Y10 (1)
( ) Number of outputs
The demand calculated by the PI control from the current room temperature and
setpoint is provided to the valve actuator as a continuous DC 0...10 V signal via
output Y10.
The electrical heater receives an ON command via the auxiliary heating control
output Y21:
1. When the acquired room temperature is below “setpoint for electric heater”.
2. When the electrical heater has been switched off for more than 1 minute.
The OFF command for the electrical heater is output:
1. When the acquired room temperature is above the setpoint (electric heater).
2. When the electrical heater has been switched on for more than 1 minute.
A safety thermostat (to prevent overheating) must be provided externally.
Overview of control
output
DC 0...10 V control
signal
Electrical heater
control signal
(2-position)
Caution

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4.8 Multifunctional input
The controller offers two multifunctional inputs X1 and X2. A sensor of type NTC
like QAH11.1 (AI) or a switch (DI) can be connected to the input terminals. The
functionality of both inputs can be configured via parameters P38 for input X1 and
P40 for input X2.
#Function of input X1/X2 Description Type
0 Not used No function. -
1 External/Return air temp. Sensor input external room
temperature sensor or return air
temperature sensor to measure the
current room temperature.
AI
2 Heat/cool changeover Sensor input for automatic
heating/cooling changeover
function. A switch can also be
connected rather than a sensor.
AI/(DI)
3 Operating mode switchover Digital input to switch over the
operating mode to Energy Saving.
If the operating mode switchover
contact is active, user operations
are ineffective and “OFF” is
displayed.
DI
4 Dewpoint monitor Digital input for a dewpoint sensor
to detect condensation. Cooling is
stopped if condensation occurs.
DI
5 Enable electrical heater Digital input to enable/disable the
electrical heater via remote control. DI
6 Alarm Digital input to signal an alarm.
If the input is active, “ALx” (x:=1 or 2)
is displayed.
Note: Alarm displays do not influ-
ence controller operations. They
merely represent a visual signal.
Example: No air flow or el. heater
overheated.
DI
Operational action can be changed between normally open (N.O.) and normally
closed (N.C.) via parameter P39 or P41 if it is a digital input (DI).
Each function can only be assigned to input X1 or X2; only “Alarm” can be
assigned to both inputs.
X1 is factory-set to “Operating mode switchover” (3) and X2 to “Heating/cooling
changeover” (2).
For more information see section 4.4 “Applications”.

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4.9 Error handling
When the room temperature is outside the measuring range, i.e. above 49 °C or
below 0 °C, the limiting temperatures flash, e.g. “0 °C” or “49 °C”.
If the temperature is below 0 °C and the controller is in heating mode and the
current setpoint is not set to “OFF”, then the control output Y10 or Y21 respectively
will issue actuator control commands to heating equipment.
For all other cases, the control output is de-energized. The controller resumes
Comfort mode after the temperature returns to within the measuring range.
4.10 DIP switches
Use the DIP switches on the inner side of the front panel to commission the basic
controller applications prior to snapping it to the base.
DIP switch number 1 2
Application
Single duct (factory setting) OFF n.a.
Single duct & electrical heater ON n.a.
DC 0…10 V output signal normal (factory setting) n.a. OFF
DC 0…10 V output signal inverted (see section 4.5) n.a. ON
Note: During startup, the controller reloads the control parameter factory settings
after each DIP switch settings change.
Temperature out of
range
ON
1 2

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4.11 Control parameters
A number of control parameters can be readjusted to optimize control performance.
These parameters can also be set during operation without opening the unit. In the
event of a power failure, all control parameter settings are retained.
The control parameters are divided in two levels:
·“Service” level, and
·“Expert” level.
The “Service” level contains a small set of parameters to set up the controller for
the HVAC system and to adjust the user interface. These parameters can usually
be adjusted any time.
Change parameters in the “Expert” level only carefully, as they impact control
performance and functionality of the controller.
Change the parameters as follows:
1. Set the controller to Standby *)
2. Press buttons + and - simultaneously for 3 seconds. Release and press
button + again for 3 seconds within 2 seconds. The display shows “P01”.
Continue at Step 3.
1. Set the controller to Standby *)
2. Press buttons + and - simultaneously for 3 seconds. Release and press
button - again for 6 seconds within 2 seconds. The display shows “P01”
and service.
3. Select the required parameter by repeatedly pressing buttons + and -.
4. When you press buttons + and - simultaneously, the current value of the
selected parameter starts to flash, which can be changed by repeatedly
pressing buttons + or -.
5. When you again press buttons + and – simultaneously, the next parameter
is displayed.
6. Repeat Steps 3 to 5 to display and change additional parameters.
7. All changes are saved and the controller returns to Standby 10 seconds
after the last display or setting.
The factory setting for the control parameters can be reloaded via parameter P71,
by changing the value to “ON”, and confirming by pressing buttons +and –
simultaneously. The display shows “8888” during reload.
*) If one of the digital inputs is commissioned as window contact, and the contact is
closed, the controller will switch to ECO mode and parameter setting will not be
possible. Solution: open the window contact.
Parameter setting
Enter only “Service”
level
Enter “Service” and
“Expert” level.
Adjust parameters
Reset parameters
Note