Siemens RDG400 Operator's manual

s
Room thermostat with display, for VAV
RDG400
Basic Documentation
Edition: 1.1
CE1P3182en
19 Jun 2009
Building Technologies

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Building Technologies Contents 19 Jun 2009
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
1.3.3 Document use / request to the reader ......................................................5
2Summary ..................................................................................................6
2.1 Brief description ........................................................................................6
2.2 Types and features....................................................................................7
2.3 Equipment combinations...........................................................................7
2.4 Accessories ...............................................................................................8
2.5 Ordering ....................................................................................................8
3Use............................................................................................................8
4Functions .................................................................................................9
4.1 Temperature control ..................................................................................9
4.2 Operating modes.....................................................................................10
4.3 Room temperature Setpoints ..................................................................11
4.4 Setpoints and sequences........................................................................12
4.5 Applications overview..............................................................................14
4.6 Additional features ..................................................................................15
4.7 Control sequences ..................................................................................18
4.7.1 Applications and sequences ...................................................................18
4.7.2 Sequences overview (setting via parameter P01) ..................................18
4.7.3 Control outputs configuration
(setting via DIP 4 / 5 and parameters P46 / P47) ...................................19
4.7.4 Single-duct ..............................................................................................20
4.7.5 Single-duct with electrical heater ............................................................21
4.7.6 Single-duct with radiator or floor heating ................................................22
4.7.7 Single-duct with heating / cooling coil .....................................................23
4.8 Control outputs........................................................................................24
4.8.1 Control output for air flow ........................................................................24
4.8.2 Control output for electrical heater, radiator and heating / cooling coil...25
4.9 Multifunctional input, digital input ............................................................27
4.10 Handling of faults ....................................................................................28
4.11 DIP switches............................................................................................28
4.12 Control parameters .................................................................................29
4.12.1 Parameters of the “Service level”............................................................30
4.12.2 Parameters of the "Expert level" with "Diagnostics and test" ................31
5Handling.................................................................................................33
5.1 Mounting and installation ........................................................................33
5.2 Operation.................................................................................................34
5.3 Disposal...................................................................................................35

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6Engineering ...........................................................................................36
6.1 Connection terminals ..............................................................................36
6.2 Connection diagrams ..............................................................................37
7Mechanical design ................................................................................38
7.1 General ...................................................................................................38
7.2 Dimensions .............................................................................................38
8Technical data .......................................................................................39
Index ................................................................................................................41

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Building Technologies About this document 19 Jun 2009
1 About this document
1.1 Revision history
Edition Date Changes Section Pages
1.1 June 2009 Layout and language corrections all
1.0 May 2009 First edition
1.2 Reference documents
Ref. Document title Type of document Document no.
[1] Wall-mounted room thermostat with LCD Data Sheet CE1N3182en
[2] RDG400 Operating Instructions CE1B3182en
[3] RDG400 Mounting Instructions CE1M3182en
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
This document was prepared with great care.
•The contents of this document is 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 make sure that you are aware of the latest document revision date.
If you find 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.
The addresses of the Siemens Regional Companies are available at
www.buildingtechnologies.siemens.com.

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1.3.3 Document use / request to the reader
Before using our products, it is important that you read the documents supplied
with or ordered at the same time as the products (equipment, applications, tools
etc.) carefully and in full.
We assume that persons using our products and documents are authorized and
trained appropriately and have the technical knowledge required to use our
products as intended.
More information on the products and applications is available:
•On the intranet (Siemens employees only) at
https://workspace.sbt.siemens.com/content/00001123/default.aspx
•From the Siemens branch office near you
www.buildingtechnologies.siemens.com or from your system supplier
•From the support team at headquarters fieldsupport-[email protected] if
there is no local point of contact
Siemens assumes no liability to the extent allowed under the law for any losses
resulting from a failure to comply with the aforementioned points or for the improper
compliance of the same.

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2 Summary
2.1 Brief description
•Single-duct system
•Single-duct system with electrical heater
•Single-duct system and radiator / floor heating
•Single-duct system with heating / cooling coil
•2 multifunctional inputs and 1 digital input for keycard contact, external sensor,
etc.
•Operating modes: Comfort, Energy Saving and Protection
•Automatic or manual heating / cooling changeover
•Adjustable commissioning and control parameters
•Minimum and maximum setpoint limitation
•Backlit LCD
•AC 24 V operating voltage
•Modulating PI/P control
•Output DC 0…10 V
•Output signal inversion (DC 10…0 V) as an option
•Output on/off, PWM or 3-position control
•Adjustable minimum and maximum limitation of air flow output signal
•Maintenance of room temperature via built-in temperature sensor or external
room temperature / return air temperature sensor
•Automatic or manual changeover between heating and cooling mode
•Selection of applications via DIP switches
•Selection of operating mode via the operating mode button on the thermostat
•Display of current room temperature or setpoint in °C and/or °F
•Minimum and maximum setpoint limitation
•Button lock (automatic or manual)
•1 digital input, freely selectable for:
– Operating mode switchover contact (keycard)
– Automatic heating / cooling changeover contact
– Dewpoint sensor
– Electrical heater enable
– Fault input
•2 multifunctional inputs, freely selectable for:
– Operating mode switchover contact (keycard)
– Automatic heating / cooling changeover sensor
– External room temperature or return air temperature
– Dewpoint sensor
– Electrical heater enable
– Fault input
•Floor heating temperature limit
•Reloading factory settings for commissioning and control parameters
Applications
Features
Functions

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2.2 Types and features
Product no. Operating voltage Number of control outputs Backlit LCD
ON/OFF PWM 3-pos DC 0…10 V
RDG400 AC 24 V 1 1) 1
1) 1 1) 1 
1) Either ON/OFF, 3-position or PWM (triac outputs)
2.3 Equipment combinations
Description Product no. Data
Sheet
Cable temperature sensor QAH11.1 1840
Room temperature sensor QAA32 1747
Condensation detector / extension
module
QXA2000 /
AQX2000 1542
Electrical actuator, DC 0..10 V
(for radiator valves) SSA61... 4893
Electrical actuator, DC 0..10 V
(for 2- and 3-port valves / V…P45) SSC61… 4895
Electrical actuator, DC 0..10 V
(for small valves 2.5 mm) SSP61… 4864
Electrical actuator, DC 0..10 V
(for small valves 5.5 mm) SSB61... 4891
Electrical actuator, DC 0..10 V
(for CombiValves VPI45) SSD61... 4861
Thermal actuator, DC 0..10 V
(for small valves and radiator
valves) STS61 4880
GQD161… 4605
GDB161…
GLB161…
4634
GMA161… 4614
GEB161… 4621
GCA161… 4613
GBB161…
DC 0…10 V damper actuator
GIB161…
4626
GDB181.1E/3
VAV compact controller
GLB181.1E/3
3544
DC 0..10 V actuators

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Electromotoric ON/OFF valve and
actuator
(only available in AP, UAE, SA and IN)
MVI…/MXI… 4867
Electromotoric ON/OFF actuator SFA71... 4863
Thermal actuator (for radiator valves) STA71... 4877
Thermal actuator
(
for small valves 2.5 mm
)
STP71... 4878
Electrical actuator, 3-position
(
for radiator valve
)
SSA81... 4893
Electrical actuator, 3-position
(
for small valve 2
,
5 mm
)
SSP81… 4864
Electrical actuator, 3-position
(
for small valve 5
,
5 mm
)
SSB81... 4891
Electrical actuator, 3-position
(for Combi-valve VPI45) SSD81... 4861
Electromotoric actuator, 3-position
(for valves 5.5 mm) SQS85… 4573
2.4 Accessories
Description Product no. Data Sheet
Changeover mounting kit (50 pcs / package) ARG86.3 1840
Adapter plate 120 x 120 mm for 4“ x 4“ conduit
boxes ARG70
Adapter plate 112 x 130 mm for surface wiring ARG70.2
2.5 Ordering
When ordering, please indicate product no. and description:
RDG400 room thermostat
Order valve actuators separately.
3 Use
The room thermostat is designed for the following types of system:
VAV systems via ON/OFF or modulating control outputs:
•Single-duct system
•Single-duct system with electrical heater
•Single-duct system and radiator / floor heating
•Single-duct system with heating / cooling coil
ON/OFF actuators
AC 24 V
3-position actuators
AC 24 V

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4 Functions
4.1 Temperature control
Setting of the control parameters (P01, etc., mentioned throughout the document)
is described in section 4.12.
The thermostat 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 delivering 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
•Modulating PI/P control with 3-position control output
•Modulating PI/P control with PWM output
•On/off control (2-position)
The switching differential or proportional band is 2 K for heating and 1 K for cooling
(adjustable via parameters P30 and P31).
The integral action time for modulating PI control is 5 minutes (adjustable via
parameter P35).
The display shows the acquired room temperature or the Comfort setpoint, selecta-
ble 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 thermostat is used in a system with manual heating / cooling changeover
(P01 = 2), the heating and cooling symbols on the display show the terminal
unit’s status. Thus, the symbols are displayed even when the thermostat operates
in the neutral zone. For all other cases, the heating and cooling symbols are
displayed when the heating or cooling output is activated.
Concurrent display of the current temperature or setpoint in °C and °F (parameter
P07) is possible.
General note:
Display
/
Concurrent display of
°C and °F

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4.2 Operating modes
Select the thermostat's operating mode via the operating mode button on the unit
or operating mode input (e.g. keycard occupancy sensor, when X1, X2, or D1 is set
to 3 (P38, P40, P42). 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 thermostat maintains the room temperature setpoint which
can be adjusted via the rotary knob. The fan can be set to automatic or manual
fan speed: Low, medium or high.
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 Protection 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)
The behavior of the operating mode button can be selected via parameter P02:
# Sequence Remark
1 Factory setting
2 
Comfort mode
Energy Saving
mode
Note:
Protection mode
Operating mode button

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4.3 Room temperature Setpoints
The setpoint in Comfort mode can be adjusted via the rotary knob.
For Energy Saving purposes, the setpoint setting 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 2 limits.
•For heating or cooling applications (e.g. single-duct; single-duct & H/C coil):
– The setting range in cooling mode is from P09…40 °C in place of 5…40 °C
– The setting range in heating mode is from 5…P10 °C in place of 5…40 °C
•For cooling and heating with electrical heater or radiator applications:
– P09 is the setpoint for cooling and P10 the setpoint for heating
– The setpoint can no longer be adjusted via the rotary knob
Examples Single-duct heating or cooling Single-duct cooling
with el. heater / radiator
P09 < P10
5°C 40°C25°C18°C
P10P09
Cooling setpoint adjustable 18…25 °C
Heating setpoint adjustable 18…25 °C
5°C 40°C25°C18°C
P10P09
Cooling setpoint adjustable 18…25 °C
Heating setpoint adjustable 18…25 °C
P09 ≥P10
5°C 40°C25°C21°C
P09P10
Cooling setpoint adjustable 25…40 °C
Heating setpoint adjustable 5…21 °C
Cooling fixed = 25 °C (P09)
Heating fixed = 21 °C (P10)
If the “Temporary setpoint function” is enabled via parameter P69, the setpoint
adjusted via the rotary knob 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 Energy Saving mode setpoints.
The heating setpoint is factory-set to 15 °C and the cooling setpoint to 30 °C for
cooling.
Use control parameters P65 and P66 to adjust the Protection 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 thermostat 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 overtemperature in cooling mode!
Comfort mode
Setpoint limitation
P09 < P10
P09 ≥P10
Temporary setpoint
Energy Saving mode
Protection mode
Caution

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4.4 Setpoints and sequences
On single-duct changeover applications, the Comfort setpoints for heating and
cooling sequence are the same (w).
On applications with electrical heater, radiator or heating / cooling coil, the Comfort
setpoint is at the heating sequence.
The start of the cooling sequence is linked to “Dead zone” above the Comfort
setpoint. The dead zone can be set via parameter P33.
The setpoints for Energy Saving and Protection mode are below the Comfort
setpoints (heating) and above the Comfort setpoints (cooling).
They can be set via parameters P11, P12 (Energy Saving mode) and P65, P66
(Protection mode).
The control signal for air flow can be limited via parameters P63 and P64.
See section 4.8.1.
To simplify the diagram below, only minimum limitation is shown.
w
3181D127
T[°C]
wHeatProt wCoolProt
wHeatEco wCoolEco
Comfort mode Energy Saving / Protection mode
Application Heating mode Cooling mode Heating mode Cooling mode
Single-duct
Single-duct
with min/max
limitation
Comfort mode Energy Saving Protection mode
Application
Single-duct
with electri-
cal heater
Single-duct
with radiator
Y
T
WCoolProt WCoolEco
Y
T
WCoolProt WCoolEco
Y
T
WHeatProt W
HeatEco
Y
T
WHeatProt WHeatEco
Y
T
W
Y
T
W
Y
T
W
Y
T
W
Y
T
WHeatProt W
CoolProt
YR
Y
T
WHeatProt W
CoolProt
YE
Y
T
W
YR
Y
T
W
YE
Y
T
WHeatEco W
CoolEco
YR
Y
T
WHeatEco W
CoolEco
YE

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Comfort mode Energy Saving mode
Anwendung Heating mode Cooling mode Heating mode Cooling mode
Single-duct
with heating /
cooling coil
Protection mode
Heating mode Cooling mode
W = setpoint in Comfort mode
WHeatEco/Prot = setpoint heating in Energy Saving or Protection mode
WCoolEco/Prot = setpoint cooling in Energy Saving or Protection mode
YR = radiator sequence
YE = el. heater sequence
YHC = heating / cooling coil sequence
Y
T
WHeatProt W
CoolProt
YHC
Y
T
WHeatProt W
CoolProt
YHC
Y
T
WHeatEco W
CoolEco
YHC
Y
T
WHeatEco W
CoolEco
YHC
Y
T
W
YHC Y
T
W
YHC

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4.5 Applications overview
The thermostat supports the following applications, which can be configured via
DIP switches at the rear of the unit. The control output for the damper actuator is
either DC 0…10 V (factory setting) or 3-position (see parameter P47), and for the
heating / cooling output ON/OFF, PWM, 3-position or DC 0…10 V.
Application
(set via DIP switches 1…3)
DIP
switch
Control output
(set via DIP
switches 4 and 5)
DC 0…10 V
Single-duct
•DC 0…10 V damper actuator
•3-position damper actuator
YV
T
B1
M
V
1 2 3 4 5
ON
OFF
3-position
DC 0…10 V
Single-duct with electrical heater
•DC 0…10 V damper actuator and
ON/OFF, PWM or 3-position electrical
heater
•3-position damper actuator and
DC 0…10 V electrical heater
YV
YE
M
V
T
B1
1 2 3 4 5
ON
OFF
ON/OFF, PWM or
3-position
DC 0…10 V
Single-duct and radiator / floor heating
•DC 0…10 V damper actuator and
ON/OFF, PWM or 3-position radiator
•3-position damper actuator and
DC 0…10 V radiator
YR
YV
T
B1
1 2 3 4 5
ON
OFF
ON/OFF, PWM or
3-position
DC 0…10 V
Single-duct heating / cooling coil
•DC 0…10 V damper actuator and
ON/OFF, PWM or 3-position heating /
cooling
•3-position damper actuator and
DC 0…10 V heating /cooling
YV
M
V
Y1
T
B2
T
B1
1 2 3 4 5
ON
OFF
ON/OFF, PWM or
3-position
Key Y1 Heating or heating / cooling valve
actuator
B1 Return air temperature sensor or external
room temperature sensor (optional)
YV damper actuator B2 Changeover sensor (optional)
YE Electrical heater

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4.6 Additional features
The output signal DC 0…10V (Y10) can be inverted by means of DIP switch 4
(see section 4.7.3).
To ensure a minimum or maximum supply air volume, the output signal for the air
flow (DC 0...10 V or 3-position) can be limited to a minimum value via parameter
P63 and to a maximum value via parameter P64.
Both values can be set between 0% and 100%.
T Room temperature
Y10 Control output
w Room temperature setpoint
XpH Proportional band “Heating”
XpC Proportional band “Cooling”
Vmin Minimum limitation air flow
max
min
Changeover
XpH
Y10
0%
100%
TR [°C]
XpC
W
C
H
Vmin
Vmax
Vmax Maximum limitation air flow
If Vmin (P63) is set to >0, then a minimum air flow of Vmin is assured in Comfort
and Energy Saving modes.
In Protection mode, the air flow in dead zone is 0.
Example: air flow rate signal in single duct application with electrical heater:
Comfort or Energy Saving mode
with Vmin >0 (P63)
Protection mode
with Vmin >0 (P63)
Protection mode (Vmin = 0)
Caution! No air flow when el.
heater is active
max
min
Y
0%
100%
TR [°C]
YV
C
H
Vmin
Vmax
wHComf/Eco wCComf/Eco
3182Z103
max
min
Y
0%
100%
TR [°C]
YV
C
H
Vmin
Vmax
wHProt wCProt
3182Z101
max
min
Y
0%
100%
TR [°C]
YV
C
H
Vmin
Vmax
wHProt wCProt
3182Z102
The water temperature acquired by the changeover sensor (QAH11.1 + ARG86.3)
is used to change over from heating to cooling mode, or vice versa. When the
water temperature is above 28 °C (parameter P37), the thermostat 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 thermostat starts in heating mode.
The water temperature is acquired at 30-second intervals and the operating state is
updated accordingly.
16
M
Tw[°C]
28
M Operating mode Cooling mode
TwWater temperature Heating mode
Output signal inversion
Min / Max air flow
Automatic heating /
cooling changeover

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The QAH11.1 cable temperature sensor for automatic heating / cooling changeover
can be replaced by an external switch for manual, remote changeover:
3076Z03
X2
MTX2
M
QAH11.1
T °C
Contact open heating mode
Contact closed cooling mode
The sensor or switch can be connected to input terminal X2 (factory setting) or X1
or D1 (switch only), depending on the commissioning of the inputs (P38, P40, P42).
See also section 4.9 “Multifunctional input”.
The thermostat 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 must be commissioned accordingly. See section 4.9 “Multi-
functional input”.
Application "Single-duct and radiator" can also be used for floor heating.
The temperature should be limited for 2 reasons: comfort and protection of the
floor. It is only available with application "Single-duct and radiator".
The floor temperature sensor, connected to multifunctional input X1 or X2, acquires
the floor temperature. If the 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 or P40 = 1).
See section 4.9 “Multifunctional input”.
Living rooms:
Up to 26 °C for long-term presence, up to 28 °C for short-time presence
Bath rooms:
Up to 28 °C for long-term 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˚C No Built-in sensor Built-in sensor Not active
10…50˚C Yes Built-in sensor Built-in sensor + limit by
external sensor Active
If the thermostat is used for chilled ceiling, dewpoint monitoring is essential to
prevent condensation. It helps avoid associated damage to the building.
A dewpoint sensor with a potential-free contact is connected to multifunctional input
X1, X2 or D1. 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.
The input must be commissioned accordingly (P38, P40, P42).
See section 4.9 “Multifunctional input”.
Remote heating/
cooling changeover
External / return air
temperature sensor
Floor heating
Floor temperature
limitation function
Recommended values
for P51:
Dewpoint monitoring

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If the button lock function is enabled by parameter P14, the buttons will be locked
or unlocked by pressing the right button for 3 seconds.
If “Auto lock” is configured, the thermostat will automatically lock the buttons
10 seconds after the last adjustment.
The thermostat can be forced into Energy Saving mode (e.g. when a window is
opened). The window contact can be connected to digital input D1 (or multi-
functional input X1, X2). Set parameter P42 (P38, P40) to 3.
The left button switches the operating mode from Energy Saving to Comfort for the
period preset in P68, if the following conditions are fulfilled:
•The operating mode switchover contact is closed (connected to input X1, X2,
D1; parameter P38, P40, P42 set to 3)
•Parameter P68 (extend Comfort period) is greater than 0
During the temporary Comfort mode extension, sandglass symbol appears.
If parameter P68 (extend Comfort period) = 0, extended Comfort cannot be
activated; pressing the left button will show “OFF” (blinking 3 times).
The current operating mode can be forced temporarily into Comfort or Energy
Saving / Protection mode. The time period is adjusted via the rotary knob:
•Extend presence: Set the device to Comfort mode for the selected time period
•Extend absence: Set the device to Energy Saving / Protection mode for the
selected time period
To activate the function, keep the left button pressed and, within 3 seconds, turn
the rotary knob…
•clockwise for extended presence
•counterclockwise for extended absence
The rotary knob adjusts the time period:
•Extend presence: 0.00…+9:30 in steps of 30 minutes; symbol appears
•Extend absence: 0.00…–9:30 in steps of 30 minutes; symbol appears
During the extended presence / absence period, sandglass symbol appears.
Function
User operating mode
selection
Operating
mode when
activating
function
Function Operating mode
during function
Operating mode at
end of function
Comfort Extension Comfort Protection
Comfort Absence Protection Comfort


Protection Not available - -
Comfort Extension Comfort E-Saving
Comfort Absence E-Saving Comfort
E-Saving Extension Comfort E-Saving
E-Saving Absence E-Saving Comfort
 
Protection Not available - -
Button lock
Operating mode
switchover contact
(window contact)
Extended Comfort
mode (operating mode
switchover contact
closed)
Temporary timer for
extension of presence /
absence

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Building Technologies Functions 19 Jun 2009
4.7 Control sequences
4.7.1 Applications and sequences
Application VAV Sequences
Single-duct h ( \ ), c ( / )
Single-duct & electrical heater el.h + c ( \ / )
Single-duct & radiator rad + c ( r\ / ),
Single-duct with heat/cool coil h + c ( \ / )
4.7.2 Sequences overview (setting via parameter P01)
The sequence can be set via parameter P01, if available.
The thermostats can be used in systems featuring:
•Heating only (P01 = 0)
•Cooling only (P01 = 1)
•Manual heating/cooling changeover (P01 = 2)
•Automatic heating/cooling changeover (P01 = 3)
•Heating and cooling mode (e.g. 4-pipe system) (P01 = 4)
The available modes depend on the application
(selected via DIP switches, see section 4.5).
Parameter P01 = 0 P01 = 1 P01 = 2 P01 = 3
Sequence
T °C T °C T °C T °C
T
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 1) 1)
Single-duct &
electrical heater
3) 3) 3) 3)
Single-duct &
radiator
3) 3) 3) 3)
Single-duct with
heat/cool coil
2) 2)
1) Changeover air
2) Changeover water; heating / cooling coil
3) The thermostat operates in heating AND cooling mode. P01 is not available
Notes:

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Siemens RDG400 Basic Documentation CE1P3182en
Building Technologies Functions 19 Jun 2009
4.7.3 Control outputs configuration
(setting via DIP 4 / 5 and parameters P46 / P47)
Control outputs
Application

ON/OFF
(2-position)
Modulating
PWM
(2-position)
Modulating
3-position
Modulating DC 0…10 V
Single-duct  
Single-duct and electrical heater    
Single-duct and radiator / floor heating    
Single-duct heating / cooling coil    
The function of the control outputs is set via DIP switches 4 and 5:
ON
OFF
123 45
ON
OFF
12345
ON
OFF
12345
ON
OFF
123 45
3181D101
DIP 4: Y10 = DC 0…10 V DC 0…10 V DC 10…0 V
(inverted)
DC 10…0 V
(inverted)
DIP 5: Y1 / Y2 = 2-position 3-position 2-position 3-position
Y1, Y2:
If 2-position is selected, the factory setting is on/off.
If you want PWM (pulse width modulation), set parameter P46 to 2 = PWM.
P47:
•0 = VAV box DC 0…10 V control signal
•1 = VAV box: 3-position control signal
For details concerning connection of peripheral devices and setting of the DIP
switches, refer to Mounting Instructions M3182 [3].
Note:

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Siemens RDG400 Basic Documentation CE1P3182en
Building Technologies Functions 19 Jun 2009
4.7.4 Single-duct
On single-duct applications, the thermostat controls an actuator (air damper, VAV
system, valve 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 signal for the air flow can be limited to a minimum and maximum value
if required (see section 4.6 "Additional features").
Modulating control: 3-position or DC 0…10 V
The diagrams below show the control sequence for modulating PI control.
Heating only (P01 = 0) Cooling only (P01 = 1)
max
min
XpH
Y10
0%
100%
TR [°C]
W
H
Vmin
Vmax
max
min
Y10
0%
100%
TR [°C]
XpC
W
C
Vmin
Vmax
Changeover (P01 = 2, 3)
max
min
Changeover
XpH
Y10
0%
100%
TR [°C]
XpC
W
C
H
Vmin
Vmax
T[°C] Room temperature XpH Proportional band “Heating”
w Room temperature setpoint XpC Proportional band “Cooling”
Y Control command “Actuator” Vmin Min. limitation for output
Vmax Max. limitation for output
The diagrams show the PI controller’s proportional part only.
Setting the sequence and the control outputs
Refer to sections 4.5 “Applications”, 4.7.1 “Sequences” and 4.7.3 “Outputs”.
Single-duct,
heating or cooling
Note: