Siemens RDF300 Series Operator's manual

RDF300, RDF300.02
RDF340, RDF600 RDF300.02/VB RDF400.01, RDF600T
Flush-mounted room thermostats for
Fan coils, with LCD
RDF300… / RDF340... / RDF400… / RDF600…
Basic Documentation
Edition 4.0
CE1P3076en
2020-02-21 Smart Infrastructure

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Table of contents
1 About this document...........................................................................3
1.1 Revision history.....................................................................................3
1.2 Reference documents............................................................................3
1.3 Before you start.....................................................................................3
1.3.1 Copyright...............................................................................................3
1.3.2 Quality assurance..................................................................................3
1.3.3 Document use / request to the reader....................................................4
2 Summary..............................................................................................5
2.1 Brief description.....................................................................................5
2.2 Features................................................................................................5
2.3 Type summary.......................................................................................6
2.4 Equipment combinations........................................................................7
2.5 Accessories...........................................................................................8
3 Use .......................................................................................................8
4 Functions .............................................................................................9
4.1 Temperature control...............................................................................9
4.2 Operating modes.................................................................................10
4.3 Room temperature setpoints................................................................11
4.4 Applications.........................................................................................12
4.5 Additional features...............................................................................15
4.6 Control sequences...............................................................................17
4.6.1 2-pipe fan coil unit................................................................................18
4.6.2 2-pipe fan coil unit with electrical heater...............................................19
4.6.3 4-pipe fan coil unit................................................................................21
4.7 Control outputs....................................................................................23
4.8 Fan control..........................................................................................24
4.9 Multifunctional input.............................................................................27
4.10 Auto Timer (RDF400… / RDF600T only)..............................................28
4.11 Error handling......................................................................................30
4.12 Infrared remote control.........................................................................30
4.13 DIP switches........................................................................................31
4.14 Control parameters..............................................................................31
5 Handling.............................................................................................34
5.1 Mounting and installation .....................................................................34
5.2 Operating Instructions..........................................................................35
5.3 Disposal ..............................................................................................35
6 Engineering........................................................................................36
6.1 Connection terminals...........................................................................36
6.2 Connection diagrams...........................................................................37
6.2.1 Water-based fan coil applications with RDF300... / RDF400... /
RDF600… ...........................................................................................37
6.2.2 Compressor-based applications with RDF300... / RDF400... / RDF600…38
6.2.3 Water-based fan coil applications with RDF340....................................39
7 Mechanical design.............................................................................40
7.1 Dimensions..........................................................................................41
8 Technical data....................................................................................42
Index ............................................................................................................44

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1 About this document
1.1 Revision history
Edition Date Changes Section Pages
4.0 2020-02-21 ·Added RDF300.02/VB 1, 6
3.0 2014-10-15 ·Update overcurrent protection
from a fuse to a circuit breaker;
·Update the notation for valves;
·Update the warning for wiring
and mounting;
·Update the standards and
directives for RoHS 2.0.
4.4
4.6
5.1
6.2
8
12
17
34
37
42
2.0 Oct 2012 Added RDF600… All All
1.1 28 Aug 2008 Left column in table 4.4 Applications 12
1.0 10 July 2008 First edition
1.2 Reference documents
Ref. Document title Type of document Document No.
N3076 Flush-mounted room temperature
controllers with LCD Datasheet CE1N3076
B3076 Operating instructions CE1B3076...
M3076 Mounting instructions RDF3... RDF400 CE1M3076
M3163 Mounting instructions RDF600… CE1M3163
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 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 [e-mail]
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
The devices support:
– 2-pipe, 2-pipe with electrical heater and 4-pipe fan coil units
– Compressors in DX-type equipment
·RDF300… / RDF400… / RDF600… :
AC 230 V operating voltage, on/off or 3-position control outputs
·RDF340 AC 24 V operating voltage, DC 0…10 V control outputs
·Output for 3-speed or 1-speed fan
·Two multifunctional inputs for keycard contact, external sensor, etc.
·Operating modes: Comfort, Economy and Protection
·Automatic or manual heating/cooling changeover
·Adjustable commissioning and control parameters
·Minimum and maximum setpoint limitation
Additional features
·Backlit LCD (RDF300.02, RDF300.02/VB, RDF400.01, RDF600, RDF600T)
·Infrared remote control receiver (RDF400.01, RDF600T)
·Auto Timer mode with 8 programmable timers (RDF400.01, RDF600T)
Type of mounting / suitable conduit boxes
·RDF600... for Round CEE box, with min 60 mm diameter, min 40 mm depth
·RDF3… / RDF400... for recessed square box with 60.3 mm fixing centers
2.2 Features
·Maintain room temperature via built-in temperature sensor or 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
·Single or 3-speed fan control (automatic or manual)
·Display current room temperature or setpoint in °C and/or °F
·Minimum and maximum setpoint limitation
·Keypad 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
– Electrical heater enable
– Alarm input
·Advanced fan control function, i.e. fan kick, fan start, selectable fan operation
(enable, disable or depending on heating or cooling mode)
·Purge function together with 2-port valve in a 2-pipe changeover system
·Reminder to clean filters
·Floor heating temperature limit
·Reload factory settings for commissioning and control parameters
·Weekly time program: 8 programmable timers to switch over between Comfort
and Economy mode (RDF400.01 / RDF600T)

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·Optional backlit LCD (RDF300.02 / RDF300.02/VB / RDF400.01 / RDF600 /
RDF600T)
·Optional infrared remote control ( RDF400.01 / RDF600T)
2.3 Type summary
Product number Stock
number
Features Color
Operating Voltage
Control outputs
Time program Backlit
LCD
Infrared
receiver
1)
Suitable conduit box 2)
on/off 3pt DC 0..10V
RDF300
RDF300 AC 230V ü ü square White
RDF300.02 RDF300.02 AC 230V ü ü ü square White
RDF300.02/VB
S55770-T427 AC 230 V ü ü ü square Black
RDF400.01 RDF400.01 AC 230V ü ü ü ü ü square White
RDF340
RDF340 AC 24V üsquare White
RDF600
S55770-T291 AC 230V ü ü ü round White
RDF600T S55770-T292 AC 230V ü ü ü ü ü round White
1) Infrared remote control is to be ordered as separate item
2) Square conduit box e.g. ARG71. ,
Round conduit box min 60 mm diameter and min 40 mm depth

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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
Cable temperature sensor,
cable length 4 m
NTC (3 kWat 25 °C) QAP1030/UFH 1854
Condensation monitor QXA21.. A6V10741
072
Electromotoric ON/OFF actuator SFA21... 4863
Electromotoric ON/OFF valve and
actuator (only available in AP,
UAE, SA and IN) MVI…/MXI… 4867
Zone valve actuators (only
available in AP, UAE, SA and IN) SUA… 4832
Thermal actuator (for radiator
valve) STA23... 4884
Thermal actuator
(for small valves 2.5 mm) STP23... 4884
Electrical actuator, 3-position
(for radiator valve) SSA31... 4893
Electrical actuator, 3-position
(for small valve 2.5 mm) SSP31… 4864
Electrical actuator, 3-position
(for small valve 5.5 mm) SSB31... 4891
Electrical actuator, 3-position
(for 2- and 3-port valves / V…P45) SSC31… 4895
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
Electromotoric actuator, DC 0...10
V (for valves 5.5 mm) SAS61.. 4581
Electromotoric actuator, DC 0...10
V (for valves 5.5 mm) SAT61.. 4584
Electrothermal actuator,
AC 24 V, NC, DC 0…10 V, 1 m STA63 4884
Electrothermal actuator,
AC 24 V, NO, DC 0…10 V, 1 m STP63 4884
*) The documents can be downloaded from http://siemens.com/bt/download.
on/off actu
ator
s
3
-
position act
ua
tor
s
D
C 0…10 V
actua
tors

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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 RDF3... RDF400…
for increasing the headroom in the
conduit box by 10 mm
ARG70.3 N3009
Conduit box for flush-mounted
thermostat RDF3... RDF400… ARG71 / S55770-T137
N3009
3 Use
To control the room temperature in individual rooms and zones that are:
·Heated or cooled with 2-pipe fan coil units
·Heated or cooled with 2-pipe fan coil units with electrical heater
·Heated and cooled with 4-pipe fan coil units
·Heated or cooled with compressor in DX-type equipment
·Heated or cooled with compressor in DX-type equipment with electrical heater
·Heated and cooled with compressor in DX-type equipment
The RDF300…/RDF400… / RDF600... controls:
·One single or 3-speed fan
·One or two on/off valve actuators
·One on/off valve actuator and one 1-stage electrical heater
·One 3-position valve actuator
·One 1-stage compressor in DX-type equipment or one 1-stage compressor with
electrical heater
The RDF340… controls:
·One single or 3-speed fan
·One or two DC 0…10 V valve actuators
·One DC 0…10 V valve actuators and one modulating
electrical heater (DC 0…10 V)
Use in systems with:
·Heating or cooling mode
·Automatic heating/cooling changeover
·Manual heating/cooling changeover
·Heating and cooling mode (e.g. 4-pipe system)

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4 Functions
4.1 Temperature control
The setting of he control parameters (P01 etc., mentioned throughout the
document) is described in section 4.14.
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 depending on the
controller type:
·On/off control (2-position) with RDF300…/RDF400… / RDF600…
·Modulating PI control with 3-position control output on RDF300…/RDF400… /
RDF600…
·Modulating PI control with DC 0..10 V control output on RDF340
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 fan coil or
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 control-
ler or operating mode input (e.g. keycard occupancy sensor, when X1 or X2 set to
3 (P38, P40)). Acorresponding 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. The fan can be set to automatic or manual fan speed: Low, medium
or high.
Economy 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 Economy
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)
In Auto Timer mode AUTO, the controller automatically changes from Comfort to
Economy mode as per the 8 preprogrammed timers. The display shows the Auto
Timer mode symbol AUTO along with the symbol for the current operating mode
(Comfort or Economy ).
Automatic is the default fan speed in Auto Timer mode.
Comfort mode
Economy
Note
Protection mode
Auto Timer mode AUTO
(only with RDF400... ,
RDF600T
)

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4.3 Room temperature 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. 2-pipe)
– 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 heating and cooling applications (e.g. 4-pipe)
–P09 is the setpoint for cooling and P10 the setpoint for heating;
– the setpoint can no longer be adjusted via the +/- buttons
Examples
2
-
pipe Heating OR cooling
4
-
pipe Heating AND cooling
P09 < P10
Cooling setpoint adjustable 18…25°C
Heating setpoint adjustable 18…25°C Cooling setpoint adjustable 18…25°C Heating setpoint adjustable 18…25°C
P09 ≥P10
Cooling settable 25…40°C
Heating settable 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 +/- 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 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 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 mo
de
Setpoint limitation
P09 < P10
P09 ≥P10
Temporary setpoint
Economy
mode
Protection 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. Depending on the type,
on/off or modulating control outputs are available.
Applications for fan coil systems
Application and output signal, DIP switches, diagram
·2-pipe fan coil unit
ON/OFF
(heating or cooling)
ON
1 2
RDF300...
RDF400...
RDF600...
·2-pipe fan coil unit
ON/OFF
(heating or cooling)
with electrical heater
ON
1 2
RDF300...
RDF400...
RDF600...
·2-pipe fan coil unit
modulating, DC 0…10 V
(heating or cooling)
ON
1 2 RDF340
·2-pipe fan coil unit
modulating, DC 0…10 V
(heating or cooling)
with electrical heater
ON
1 2
RDF340
3076D20
(B1)
M1
V1
TB2
T
T
(B1)
V1
M1
3171D21
T
B2 E1
T
(B1)
T
(B1)
·2-pipe fan coil unit
modulating, 3-position
(heating or cooling)
ON
1 2
RDF300...
RDF400...
RDF600...
·4-pipe fan coil unit
ON/OFF
(heating and cooling)
ON
1 2
RDF300...
RDF400...
RDF600...
ON
1 2 RDF340
3076D20
(B1)
M1
V1
TB2
T
T
(B1)
T
V2
V1
M1
3076D22
(B1)
T
(B1)
V1 Heating or heating/cooling valve actuator M1 3-speed or single-speed fan
V2 Cooling valve actuator B1 Return air temperature sensor or
external room temperature sensor (optional)
E1 Electrical heater B2 Changeover sensor (optional)

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Applications for Universal systems
Application and output signal, DIP switches, diagram
·Chilled / heated ceiling
ON/OFF
(heating or cooling)
ON
1 2
RDF300...
RDF400...
RDF600...
·Chilled / heated ceiling
ON/OFF
(heating or cooling)
with electrical heater
ON
1 2
RDF300...
RDF400...
RDF600...
·Chilled / heated ceiling
modulating, DC 0…10 V
(heating or cooling)
ON
1 2 RDF340
·Chilled / heated ceiling
modulating, DC 0…10 V
(heating or cooling)
with electrical heater
ON
1 2
RDF340
3
1
9
1
S
1
1
N1T
B1
T
B2
T
D3
V1
3
1
9
1
S
1
2
N1T
E1
B1
T
B2
T
D3
V1
·Chilled / heated ceiling
modulating, 3-position
(heating or cooling)
ON
1 2
RDF300...
RDF400...
RDF600...
·Chilled ceiling and
radiator ON/OFF
(heating and cooling)
ON
1 2
RDF300...
RDF400...
RDF600...
ON
1 2 RDF340
3
1
9
1
S
1
1
N1T
B1
T
B2
T
D3
V1
3
1
9
1
S
1
3
N1T
B1
T
D3
V2
V1
V1 Heating or heating / cooling valve actuator B1 Return air temperature sensor or external room
temperature sensor (optional)
V2 Cooling valve actuator B2 Changeover sensor (optional)
E1 Electrical heater D3 Dewpoint sensor

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Applications for heat pump systems
Application and output signal, DIP switches, diagram
·1-stage compressor
ON/OFF
(heating or cooling)
ON
1 2
RDF300...
RDF400...
RDF600...
·1-stage compressor
ON/OFF
(heating or cooling)
with electrical heater
ON
1 2
RDF300...
RDF400...
RDF600...
3181S31
N1
T
B1
T
D3
3
1
8
1
S
3
2
N1T
E1
B1
T
D3
·1-stage compressor
ON/OFF
(heating and cooling)
ON
1 2
RDF300...
RDF400...
RDF600...
3181S35
N1
T
B1
T
D3
N1 Thermostat
Terminal Y10/Y11: Heating (H&C) or Heating/Cooling
Terminal Y20/Y21: Cooling (H&C)
B1 Return air temperature sensor or external room
temperature sensor (optional)
E1 Electrical heater D3 Dewpoint sensor
Note: The diagrams above show only the water based fan coil application, but not compressor!
Use with one or two valves for heating and cooling, heating/cooling with
changeover, heating only, or cooling only.
Water-based fan coil
application

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Use with one 1-stage compressor for heating and cooling, or cooling only, or
heating only.
Thanks to a flexible fan control, the RDF3xx / RDF4xx can also be used in
universal applications, e.g. fan coil-based cooling and floor heating, or chilled
ceiling and electrical heater etc. See also section 4.8 “Fan control”.
4.5 Additional features
The water temperature acquired by the changeover sensor (QAH11.1 + ARG86.3)
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 previous mode.
The water temperature is acquired at 30-second intervals and the operating state is
updated accordingly.
M Operating mode Cooling mode
TwWater 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 4.9
“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 4.9 “Multi-
functional input”.
The changeover sensor is tasked with initiating changeover from heating to cooling
mode based on the acquired water temperature. We recommend activating the
purge function (parameter P50) with 2-port valves. This function ensures correct
acquisition of the medium temperature even if the 2-port valve is closed for an
extended period of time. The valve is then opened for 1 to 5 minutes (adjustable) at
2-hour intervals during off-hours.
The purge function (parameter P50) must be disabled if the controller is to be used
in compressor-based applications.
Compressor-based
application
Universal application
s
Automatic H/C
changeover
Remote heating/
cooling changeover
External / return air
temperature s
ensor
Purge function
Caution

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In very warm and humid climates, the fan can be run periodically or continuously at
a low fan speed (e.g. in empty apartments or shops) in Economy mode by setting
parameter P61 to avoid damage from moisture due to a lack of air circulation. See
also section 4.8 “Fan control”, under “Fan kick function”.
Limit the on/off switching cycle to protect the compressor and reduce wear and
tear. The minimum output on-time and off-time for 2-position control output
Y11/Y21 can be adjusted from 1 to 20 minutes via parameters P48 and P49.
The factory setting is 1 minute
Readjusting the setpoint or heating/cooling mode changeover immediately results
in calculation of the output status; controller output Y11/Y21 may not hold the min.
1-minute on/off time.
If parameter P48 or P49 is set to above 1 minute, the min. on/off time for Y11 is
maintained as set, even if setpoint or changeover mode is readjusted.
This function is only available for on/off control.
The floor heating limitation function is a part of the floor heating application
(heating with fan disabled).
The floor temperature sensor, connected to multifunctional input X1 or X2,
measures the floor temperature. If the temperature exceeds the parameterized limit
(parameter P51), the heating valve is fully closed until the floor temperature drops
to 2K 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”.
Parameter
P51
External temperature
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 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
Dewpoint monitoring is essential to prevent condensation on the chilled ceiling
(cooling with fan disabled). It helps to avoid associated damage to the building.
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 4.9 “Multifunctional input”.
If the key lock function is enabled by parameter P14, then the keypad will be
locked or unlocked by pressing 7 seconds (RDF600...: 3 seconds) on the operating
mode button .
If “Auto lock” is configured, then the controller will automatically lock the keypad 30
seconds after the last adjustment.
Avoid damage from
moisture
Minimum output
on
-
time/off
-
time
Floor heating
limitation function
Dewpoint monitoring
K
ey
lock

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4.6 Control sequences
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)
·Heating and cooling mode (e.g. 4-pipe system) (P01=4)
The relevant modes are available and can be adjusted via commissioning
parameter “Control sequence” P01, depending on the selected application.
Sequence
Parameter P01 = 0 P01 = 1 P01 = 2 P01 = 3 P01 = 4
Mode
Available for:
Heating mode Cooling mode
*) 2-pipe with
el. heater
Manually select
heating or
cooling mode
Automatic
heating/cooling
changeover via
external water
temperature
sensor or
remote switch
Heating and
cooling mode,
i.e. 4-pipe
2-pipe,
2-pipe & el. heater ü ü ü ü
4-pipe üüü

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4.6.1 2-pipe fan coil unit
In 2-pipe applications, the controller controls a valve in heating/cooling mode with
changeover (automatic or manual), heating only mode, or cooling only mode.
Cooling only is factory set (P01=1).
The diagram below shows the control sequence for on/off (2-position) control.
Heating mode Cooling mode
T[°C] Room temperature SDH Switching differential “Heating”
w Room temperature setpoint SDC Switching differential “Cooling”
V1 Control command “Valve” or “Compressor”
The diagram below shows the control sequence for continuous PI control.
Heating mode Cooling mode
T[°C] Room temperature XpH Proportional band “Heating”
w Room temperature setpoint XpC Proportional band “Cooling”
V1 Control command “Valve”
·The diagrams only show the PI thermostat’s proportional part.
·For the fan sequence see section 4.8.
On/off output
Heating or cooling
Control sequence
on/off output
Control sequence
modulating output
Notes:

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4.6.2 2-pipe fan coil unit with electrical heater
In 2-pipe applications with electrical heater, the controller controls a valve in
heating/cooling mode with changeover, heating only mode, or cooling only mode
plus auxiliary electrical heater. Cooling only is factory set (P01=1) with enabled
electrical heater (P13).
In cooling mode, the valve receives an OPEN command if the acquired
temperature is above the setpoint. The electrical heater receives an ON command
if the acquired room temperature drops below “setpoint” – “dead zone” (=“setpoint
for electrical heater”) while the electrical heater is enabled (parameter P13).
Note: “Setpoint for electrical heater” is limited by parameter “Maximum heating
setpoint” (P10).
In heating mode, the valve receives an OPEN command if the acquired
temperature is below the setpoint. The electrical heater is used as additional
heating source when the heating energy controlled by the valve is insufficient. The
electrical heater receives an ON command, if the temperature is below “setpoint” –
“setpoint differential” (=setpoint for electrical heater).
The electrical heater is active in heating mode only and the control output for the
valve is permanently disabled when manual changeover is selected (P01=2).
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 on/off (2-position) control.
Heating mode
(automatic changeover=hea
ting or heatin
g
only)
Cooling mode
(
ma
n. /au
to. changeove
r=cooli
ng or coo
l
ing only)
Heating mode with manual changeover
(P01=2)
(manual changeover=heating)
T[°C] Room temperature
W Room temperature setpoint
V1 Control command “Valve” or “Compressor”
E1 Control command “electrical heater”
SDH Switching differential “Heating”
SDC Switching differential “Cooling”
Xdz Dead zone
wDSetpoint differential
Heating or cooling with
electrical heater
Electrical heating,
active in cooling mode
Electrical heating in
heating mode
Electrical heating, and
manual changeover
Digital input “Enable
electrical heater”
Control sequence
on/off output

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For better temperature control performance with 2-pos electrical heater, we
suggest to set the switching differential heating (P30) to 1K.
The diagram below shows the control sequence for continuous PI control.
Heating mode
(automati
c
change
over=heating
or heat
ing only)
Cooling mode
(man. /auto. changeover=cooling or coo
l
ing only)
Heating mode with manual changeover
(P01=2)
(man
ual changeover
=h
eating)
T[°C] Room temperature
W Room temperature setpoint
V1 Control command “Valve”
E1 Control command “electrical heater”
XpH Proportional band “Heating”
XpC Proportional band “Cooling”
Xdz Dead zone
wDSetpoint differential
·The diagrams only show the PI thermostat’s proportional part.
·For the fan sequence see section 4.8.
Note
Control sequence
modulating output
Notes: