Siemens RDF880KN/NF User manual

A6V11282546_en--_a
2018-04-19 Building Technologies
s
A6V
11282546
RDF880KN/NF
Touch Screen Flush-mount Room
Thermostats with KNX
Communications
Under Floor Heating (UFH) control application
with an additional HMI for
Variable Refrigerant Flow (VRF) commands via KNX S-mode
·Large display, touch screen with backlight
·VRF HMI: adjust setpoint, fan mode, fan speed and operating modes
·2-position (ON/OFF) temperature control with potential free output for UFH
via build-in / external temperature sensor
·Display room temperature value (°C) and relative humidity value (% r.h.)
via a build-in temperature and humidity sensor
·One setpoint adjustment for both VRF HMI and UFH controls
·Fan auto and manual speed setting from 1 up to 7 speed
·Operating mode selection for VRF: AUTO, COOL, HEAT, FAN and DRY
·Operating mode selection for UFH: Comfort and Protection
·Economy operating mode for both VRF and UFH to save energy
·2 multifunctional inputs (see details in functional descriptions)
·Adjustable control parameters for alternative settings
·KNX bus communications via S-mode and LTE-mode
·Integration to VRF system via S-mode and third party gateways
·Commissioning via ETS download
·Wizard function for fast commissioning via HMI
·Alarm / Error information
·AC 230 V operating voltage
·RDF880KN/NF: Mounting on recessed square 86 mm box with 60.3 mm
fixing centers and min 40 mm depth, requires additional mounting frame
to complete installation

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Building Technologies Touch Screen Flush-mount Room Thermostats with KNX Communications 2018-04-19
Use
More than just room temperature control via a connected VRF system or a UFH
system or both:
Typical applications:
·Residential apartments
·Small office or commercial buildings
·Schools / Universities
For the VRF HMI, the unit interfaces to VRF systems via a third party gateway for:
·User application selection: - UFH only or VRF only or both
·Setpoint adjustment: - maximum / minimum limitations
·Fan speed adjustment: - auto / manual speeds (up to 7 speeds)
·Operating mode selection: - AUTO, HEAT, COOL, FAN and DRY
·Economy mode: - energy saving
·Fan swing adjustment (optional): - auto swing or fix at any position (10)
·Delay off timer (optional): - allow up to 23 hours operations before off
For the control of the following pieces of heating equipment:
·Floor Heating
·Thermal valves or zone valves
·Gas or oil boilers
·Fans
·Pumps
The configuration can be done locally or remotely via one of the following:
·Local HMI & DIP switches
·Synco ACS (UFH only)
·ETS4/5 (binding S-mode objects for VRF & UFH)
Functions
·Room temperature control via a built-in or external room temperature sensor
·Calibrations for both internal temperature and relative humidity sensors
·Display of current room temperature or setpoint in °C
·Minimum and maximum limitation of room temperature setpoint
·Fan speed adjustment, auto, manual (up to 7 speeds)
·Selection of VRF operating mode:
àAUTO, HEAT, COOL, FAN and DRY
·Selection of UFH operating mode:
àComfort and Protection
·Energy saving (Economy mode) for both VRF and UFH
·Key lock function: unlock, total lock and setpoint lock
·2 multifunctional inputs, freely selectable for:
-External room temperature or return air temperature sensor
-Window contact
-Fault input
-Monitor input for temperature sensor or switch state
·Floor heating temperature limitation
·Display of outdoor temperature and time scheduling via KNX bus
·Reload factory settings for commissioning and control parameters
Optional: enable / disable via parameters
·Relative humidity display via a built-in humidity sensor
·Fan swing selection: auto swing or fix at any position (up to 10)
·Delay off timer: up to 23 hour operations
·Chinese text display for 4 navigation icons

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Applications
RDF880KN/NF is designed to provide easy-to-understand HMI for any existing
VRF system installed in residential homes and apartments where Under Floor
Heating (UFH) room thermostat may be required at the same time.
RDF880KN/NF has three kinds of applications including VRF HMI or UFH or both.
Applications are selectable via DIP switches.
Download via ETS
(All in OFF positions)
UFH only
VRF HMI only
VRF HMI and UFH
For selection under application mode via HMI, refer to user manual A6V11272225
for selecting applications.
UFH Application
For the UFH application, RDF880KN/NF provides an ON/OFF output to control
water valve to maintain a comfort level of room temperature.
Room thermostat to control the valve
for the floor heating application

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Building Technologies Touch Screen Flush-mount Room Thermostats with KNX Communications 2018-04-19
VRF Application (HMI only)
For the VRF application, RDF880KN/NF provides an easy-to-understand HMI for
adjusting frequent used operations of the VRF systems such as adjustments of
temperature setpoint, fan speed, VRF operating mode, etc.
Since all VRF brands have their own communication protocols
between the remote control unit and VRF equipments (e.g. indoor
or outdoor units), RDF880KN/NF can send all standard KNX
commands (S-mode KNX objects) via the KNX bus to a third party
KNX/VRF gateway (as a protocol converter) and then communicate
indirectly with the VRF indoor or outdoor units. Effectively, it works
similarly like a remote control unit of a VRF system.
Note that RDF880KN/NF cannot replace all functions of the remote
control unit of the VRF system but the following typical VRF
functions:
·Temperature - provide current room temperature value
- adjust temperature setpoint
·Fan - select auto or manual speed up to 7 levels
- select auto swing or fixed swing positions
·Operation - set to AUTO, HEAT, COOL, FAN and DRY
Typical VRF Systems
(Provided by 3rd Party, non-Siemens products)
Integration
via KNX Bus S-mode

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Other Heating Applications
RDF880KN/NF is not limited to UFH applications but also for the following heating
applications such as radiators, wall hung boilers, etc.
Room thermostat to control the valve of
the radiator application
Room thermostat with direct control of a
gas-fired wall-hung boiler
Room thermostat with direct control of a
gas-fired floor-standing boiler
Room thermostat with direct control of a
heat pump (pre-controlled by manual
mixing valve)
Room thermostat with direct control of
hydronic floor heating system
F1 Thermal reset limit thermostat
F2 Safety limit thermostat
M1 Circulating pump
N1 Room thermostat
V1 2-port valve
V2 Mixing 3-port valve with
manual adjustment
V3 Magnetic valve

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Building Technologies Touch Screen Flush-mount Room Thermostats with KNX Communications 2018-04-19
Type summary
Product no. Stock no. Operating
voltage Control outputs Suitable for
3-pos ON/OFF DC 0..10 V
RDF880KN/NF
2)
S55770-T398 AC 230 V -- 11) -- Square conduit box
2)
1) ON/OFF output with potential free input from AC 24…230 V
2) Mounting frames are not included and must be ordered separately. (See
“Accessories”)
Ordering
·When ordering, indicate product number, SSN and name.
e.g. RDF880KN/NF (S55770-T398) heating thermostat with VRF HMI
·A mounting frame or multi-frame must be ordered for RDF880KN/NF installation.
(See “Accessories”)
·Order valve actuators separately.
Equipment combinations
Type of unit Product no. Data sheet
Cable temperature sensor or
changeover sensor
cable length 2.5 m
NTC (3 kWat 25 °C)
QAH11.1 d) 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
Electromotoric ON/OFF actuator SFA21... 4863
Electromotoric ON/OFF valve and
actuator a) MVI…/MXI… A6V11251892
Zone valve actuators a) SUA… 4832
Thermal actuator b) STA23... 4884
Thermal actuator c) STP23... 4884
Damper actuator GDB.. 4634
Damper actuator GSD.. 4603
Damper actuator GQD.. 4604
Rotary damper actuator GXD.. 4622
a) only available in AP, UAE, SA and IN
b) for radiator valve
c) for small valves 2.5 mm
ON/OFF actuators

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d) both QAH11.1 and QAP1030/UFH are for floor heating applications, such as
temperature limitation controls. QAP1030/UFH has a special head and 4 m long
that is more suitable for such application.
Refer to data sheets of the actuators for the maximum number of parallel
operation.
Accessories
Designation Product no. / SSN Data sheet
Single mounting frame
*)
, Ivory White ARG800.1 /
S55770-T370 --
KNX Power supply 160 mA (Siemens BT LV) 5WG1 125-1AB02 --
KNX Power supply 320 mA (Siemens BT LV) 5WG1 125-1AB12 --
KNX Power supply 640 mA (Siemens BT LV) 5WG1 125-1AB22 --
*) See the dimensions of mounting frame on page 24.
Note:

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Building Technologies Touch Screen Flush-mount Room Thermostats with KNX Communications 2018-04-19
Mechanical design
The thermostats consist of the following parts:
·Front panel with electronics, operating elements and built-in room temperature
and relative humidity sensors.
·Mounting base with power electronics.
·Mounting frame is an additional part to complete the installation for
RDF880KN/NF, e.g. single or multi-frames.
The rear of the mounting base contains the screw terminals.
Slide the front panel in the mounting base and snap on.
Operation and
settings
Display
Status symbols:
Economy active Alarm / Service active
Delay timer active Key lock active
Floor heat active Fan active
VRF operating modes
Selection symbols:
Indoor temperature VRF fan speed
Outdoor temperature VRF fan swing
Relative humidity
Operational icons:
Increment, decrement OR selection
ƒ „ Selection OR move to next items
Temperature, relative humidity OR
parameter values, etc.
Parameters OR password, etc.
Setpoint mode (temperature only)
Fan mode OR fan speed mode
VRF & floor heat operating modes
More info & settings
STATUS &
OPERATIONof the
room thermostat
INFORMATION
1st line: temperature or
humidity, values of
parameters
2nd line: parameters and
alarms
Both sides: STATUS
ADJUSTMENTfor temperature setpoint, fan speed, operating modes of VRF and
Floor Heating, more INFO and settings (for example, Alarm, Delay Off Timer, etc.)
SELECTIONof
available information and
VRF fan modes

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Engineering notes
See the "Reference documentation", page 21, for information on how to engineer
the KNX bus (topology, bus repeaters, etc.) and how to select and dimension
connecting cables for supply voltage and field devices.
Mounting and installation
Mount the room thermostat on a conduit box. Do not mount on a wall in niches or
between bookshelves, behind curtains, above or near heat sources, or exposed to
direct solar radiation. Mount about 1.5 m above the floor.
Mounting / Dismounting ·Do not apply excessive force on screws! The deformation of the mounting
frame may lead to improper connections and operation of the unit.
·Mount the room thermostat on a clean, dry indoor place without direct airflow
from a heating / cooling device, and not exposed to drips or water.
·Before removing the front cover, disconnect the power supply.
Wiring See the User Manual for the installation instructions enclosed with the thermostat.
·Comply with local regulations to wire, protection and earth the thermostat.
·The device has no internal fuse for supply lines to fan and actuators. To avoid
risk of fire and injury due to short-circuits, the AC 230 V mains supply line must
have a circuit breaker with a rated current of no more than 10 A.
·The wiring cross section used for power supply (L, N) and 230 V outputs
(Qxx - N) must be adapted to the preceding overload protection elements (max
10 A) under all circumstances. Comply under all circumstances with local
regulations.
·Properly size the cables to the thermostat and valve actuators for
AC 230 V mains voltage.
·Cables of SELV inputs X1-M / X2-M: Use cables with min 230 V insulation, as
the conduit box carries AC 230 V mains voltage.
·Inputs X1-M or X2-M of different units (e.g. window contact) may be connected
in parallel with an external switch. Consider overall maximum contact sensing
current for switch rating.
·KNX communication cables (input CE+ / CE-): Use cables with min 230 V
insulation, as the conduit box carries AC 230 V mains voltage.
·When a KNX bus power supply is connected on the line with communicating
thermostats and Synco controllers, the internal KNX power supply of the
Synco controllers must be switched off.
·No cables provided with a metal shield.
·Disconnect from supply before opening the cover.

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Commissioning notes
Select DIP switch setting is required for RDF880KN... thermostats.
COMMISSIONING: Download via ETS
1. DIP switch setting
All in OFF positions
2. First power up
Press to turn ON
3. Touch & hold this
icon > 5 s to enter
Programming mode
4. Ready for downloading
address & application
Touch “ON“ to exit
COMMISSIONING: Local via DIP Switches
1. Set application via
DIP switches DIP switch
positions APPLICATION
1 2
ON ON VRF+FLOOR HEAT
OFF ON VRF ONLY
ON OFF FLOOR HEAT ONLY
2. Configure basic
control parameters
via Wizard
See Configure Parameters
via Wizard in Wizard function.
After power up, the wizard function guides users to configure the basic parameters
for normal operation according to the table below.
Touch ƒ/ „to advance / return to any parameter;
Touch +/ -to select any desired available values.
Before power up
Wizard function

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LCD display Parameter Range Factory setting
Operation Selector
1: COMF > PROT
2: COMF > ECON > PROT 1
Internal Relative
Humidity Sensor
OFF: Disable
ON: Enable ON
Maximum Fan
Speed
1 to 7
3
Maximum Fan
Swing
0: no swing function
1 to 10 positions 0
Chinese Text
Display
0: Disable
1: Enable 0
End of wizard
setup - -
If more details are required about parameters, refer to basic documentation
CE1P3174.
To reload factory setting for all parameters, set parameter P71 to ON. Restart the
thermostat after reset, all LCD segments flash, indicating that the reset is correct.
3 seconds later, the thermostat is ready for commissioning by qualified HVAC staff.
Reset

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RDF880KN… thermostats are for VRF HMI and heating applications.
Configure or changing parameter settings during commissioning using one of the
following tools:
-Local HMI
-Synco ACS
-ETS4/5
Connect the Synco ACS or ETS tools to the KNX bus cable at any point for
commissioning:
RDF880KN...
L
NQ12
X1 M X2
A
6
V
1
1
2
8
2
5
4
6
A
0
0
Q11 Q14
CE+ CE-
KNX
ETS
RS232
Siemens
N148 /
UP146 /
UP152
ETS / ACS
Siemens
OCI700
or
OCI702
ACS and ETS4/5 require an interface:
-RS232 KNX interface (such as Siemens N148 / UP146 / UP152)
-OCI700 or OCI702 USB-KNX interface
An external KNX bus power supply is required if an RDF880KN/NF is connected
directly to a tool (ACS or ETS4/5) via KNX interface.
Applications
Connect tool
Note:

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Setting parameters
Service level parameters
Parameter
Name Factory setting Range Resolution
Service level
P02 User operating mode
profile (mode button)
1 = Auto - Comfort -
Protection
1 = Auto - Comfort - Protection
2 = Auto - Comfort - Economy -
Protection
P05 Sensor calibration (intern,
extern)
0 K -5 K…+5 K 0.5 K
P06 Standard temperature
display
0 = Room Temperature or
Relative Humidity
0 = Room Temperature or Relative
Humidity
1 = Setpoint for Room Temperature
P08 Comfort setpoint 21 °C P9 to P10 0.5 K
P09 Minimum setpoint in
Comfort mode
5 °C 5…P10
(P10 = 40 °C max)
0.5 K
P10 Maximum setpoint in
Comfort mode
35 °C P09…40 °C
(P09 = 5 °C min)
0.5 K
P11 Economy heating setpoint 15 °C OFF, 5…40 °C 0.5 K
P14 Keylock function 0 0 = Unlock
1 = Locked
2 = Setpoint
P16 Buzzer function ON = Enable OFF = Disable
ON = Enable
P22 Internal r.h. sensor ON = Enable OFF = Disable
ON = Enable
P23 Calibration internal r.h
sensor
0% ±20% 1%
P27 Operating mode settings
after power failure or reset
0 = Return to Previous
Operating Mode / User
Settings
0 = Return to Previous Operating
Mode / User Settings
1 = Protection Mode
P28 Timer with delay Off OFF = Disable OFF = Disable (do not display Delay
Timer Mode symbol)
ON = Enable (display Delay Timer
Mode symbol)
1 hour
P29 User level password 0000 0000 - 9999
Note: Parameter display depends on the selected application and function.
Expert level parameters with diagnostics and test
Parameter
Name Factory setting Range Resolution
Expert level
P30 P-band / Switching
differential in heating mode
1 K 0.5…6 K 0.5 K
P38 Functionality of X1 0 = --- no function 0 = --- (no function)
1 = Room temp ext / Return temp
(AI)
3 = Window open detection (DI)
6 = Fault input (DI)
7 = Monitor input [Digital]
8 = Monitor input [Temp]

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Parameter
Name Factory setting Range Resolution
Expert level
P39 Operating action of X1 if
digital input
0 = Normally open / Open 0 = Normally open / Open
1 = Normally closed / Close
P40 Functionality of X2 0 = --- no function 0 = --- (no function)
1 = Room temp ext / Return temp
(AI)
3 = Window open detection (DI)
6 = Fault input (DI)
7 = Monitor input [Digital]
8 = Monitor input [Temp]
P41 Operating action of X2 if
digital input
0 = Normally open / Open 0 = Normally open / Open
1 = Normally closed / Close
P48 Minimum output on time 2-
position control output
1 min. 1…20 minutes 1 min.
P49 Minimum output off time 2-
position control output
1 min. 1…20 minutes 1 min.
P51 Floor heat limit
temperature
OFF OFF, 10…50 °C 1 K
P53 Fan speed 3 = 3-speed 1 = maximum 1-speed
2 = maximum 2-speed
3 = maximum 3-speed
4 = maximum 4-speed
5 = maximum 5-speed
6 = maximum 6-speed
7 = maximum 7-speed
P54 Fan Swing Position 0 = Swing function is not
available
0 = Swing function is not available
1 = Maximum 1 Position
2 = Maximum 2 Positions
3 = Maximum 3 Positions
4 = Maximum 4 Positions
5 = Maximum 5 Positions
6 = Maximum 6 Positions
7 = Maximum 7 Positions
8 = Maximum 8 Positions
9 = Maximum 9 Positions
10 = Maximum 10 Positions
P65 Protection heating setpoint 8 °C OFF, 5…40 °C 0.5 K
P68 Prolong Comfort period 0: OFF 0: OFF
1…360 min
1min
P69 Temporary setpoint
comfort (see also comfort
basic setpoint)
OFF = Disable OFF = Disable
ON = Enable
P71 Reload factory setting OFF = Disable OFF = Disable
ON = Reload factory setting
Reload starts only after exits
parameter mode.
P81 Device address 255 1…255 1
P82 Geographical zone
(apartment)
---
(out of service)
---, 1…126 1
P83 Geographical zone (room) 1 ---, 1…63 1

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Parameter
Name Factory setting Range Resolution
Expert level
P84 Heat distr. zone heating
coil
---
(out of service)
---, 1…31 1
P88 Substitution for PreComfort
(from BUS)
0 = Economy 0 = Economy
1 = Comfort
P98 Chinese text display
enable
0: Disable 0: Disable
1: Enable
P99 Installer Level Password 9999 5000 - 9999
Parameter
Name Factory setting Range Resolution
Diagnostics and
test
d01 Application no Diagnose 0 = --- (No application)
1 = Floor Heating only
2 = VRF only
3 = VRF and Floor Heating
d02 X1 status Diagnose
(display values according
to the selected function of
X1:
DI, AI, HC changeover,
etc)
0 = Not activated (for DI)
1 = Activated (DI)
0…49 °C = cur. temp. value (for AI)
00 = HC input short
100 = HC input open
d03 X2 status Diagnose
(display values according
to the selected function of
X2:
DI, AI, HC changeover,
etc)
0 = Not activated (for DI)
1 = Activated (DI)
0…49 °C = cur. temp. value (for AI)
00 = HC input short
100 = HC input open
d07 Software version
Show Ux.xx
d11 Floor Heating NC Output
Status (Q12)
Diagnose OPE = OPEN
CLO = CLOSE
d12 Floor Heating NO Output
Status (Q14)
Diagnose OPE = OPEN
CLO = CLOSE

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The thermostat's control parameters can be set to ensure optimum performance of
the entire system (refer to basic documentation CE1P3174).
The parameters can be adjusted using
-Local HMI
-Synco ACS
-ETS4/5
For commissioning via local HMI, refer to user manual A6V11272225 for setting the
passwords.
·Only heating sequence is available.
·Recalibrate the temperature sensor if the room temperature displayed on the
thermostat does not match the room temperature measured (after min. 1 hour of
operation). To do this, change parameter P05.
LCD display Parameter Range Factory setting
Sensor Calibration -5…5 K 0 K
·We recommend to review heating setpoint and their range limitation via
parameters P08…P11. If necessary, adjust them to achieve maximum comfort
and save energy.
The programming mode helps identify the thermostat in the KNX network during
commissioning.
Touch and hold for more than 5 seconds to activate programming mode, which
is indicated on the display with Pr09. Programming mode remains active until
thermostat identification is complete.
Assign device address (P81) via HMI, ACS or ETS4/5.
With device address set to 255, the communication is deactivated (no exchange of
process data).
Use ETS4/5 to assign the KNX group addresses of the RDF communication
objects.
Each device has a unique KNX serial number inside the front panel. An additional
sticker with the same KNX serial number is enclosed in the packaging box. This
sticker is intended for installers for documentation purposes.
The RDF880KN… room thermostats support communications as per KNX
specification.
-S-mode: Standard mode; engineering using group addresses.
-LTE mode: Logical Tag Extended mode, for easy engineering, used in
conjunction with Synco.
·This mode corresponds to KNX communications. Connections are established
via ETS by assigning communication objects to group addresses.
·LTE mode is specifically designed to simplify engineering. In contrast to S-mode,
there is no need to create individual connections (group addresses) in the tool.
The devices establish connections autonomously.
Control parameters
Control sequence
Calibrate sensor
Setpoint and range
limitation
Programming mode
Assign KNX device
address
Assign KNX group
addresses
KNX serial number
KNX communications
S-mode
LTE mode

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KNX S-mode communication object
Obj. Object Name Function Type Length CRWTU Descriptions / Selections:
visibility depends on DIP switch setting
4Fault information alarm info 219.001 6 bytes CT CONTROL: all DIP switch Settings
It is a command to send out common alarm output in alarm numbers/codes.
5Fault state faulty/normal 1.005 1 bit CT CONTROL: all DIP switch Settings
It is a command to set the alarm flag if an alarm occurs.
6Fault transmission enable/disable 1.003 1 bit CWU
STATUS: all DIP switch Settings
A value (enable or disable) is received from a supervisory alarm system to enable
or disable the broadcasting of alarms by the devices. This has no impact on the
local display of alarms. The sending of faults/alarms will be enabled automatically
after time out (48 hours).
7Room operating mode:
Preselection HVAC mode 20.102 1 byte CWTU
CONTROL/STATUS: use for DIP switch Setting à1: UFH, 3: BOTH
To change or to receive the room operating mode selection via the bus.
Note: The thermostat will switch from Precomfort to Economy or Comfort mode
(selectable via P88).
8Room operating mode:
Preselection Auto switch 1.001 1 bit CW
STATUS: use for DIP switch Setting à1: UFH, 3: BOTH
The value is received to switch the room operating mode to Auto, Comfort,
Economy or Protection.
9Room operating mode:
Preselection Comfort switch 1.001 1 bit CW
10 Room operating mode:
Preselection Economy switch 1.001 1 bit CW
11 Room operating mode:
Preselection Protection switch 1.001 1 bit CW
12 Room operating mode:
Time switch HVAC mode 20.102 1 byte CWU
STATUS: use for DIP switch Setting à1: UFH, 2: VRF
A time schedule defining the required operating modes is provided by a central
time switch or a supervisor.
Protection mode has the highest priority and cannot be overridden. (also refer to
P88 - Precomfort àEconomy or Comfort)
13 Room operating mode:
Time switch Comfort switch 1.001 1 bit CW STATUS: use for DIP switch Setting à1: UFH, 2: VRF
The value is received to switch the room operating mode to Auto, Comfort,
Economy or Protection according to a time schedule provided by a central time
switch or a supervisor.
14 Room operating mode:
Time switch Economy switch 1.001 1 bit CW
15 Room operating mode:
Time switch Protection switch 1.001 1 bit CW
16 Room operating mode:
State
Comfort
Economy
Protection
20.102 1 byte CRT
CONTROL: use for DIP switch Setting à1: UFH, 3: BOTH
It is a command to set the operating mode to Comfort, Economy or Protection
depending on user selection, window contact, etc.
17 Room operating mode:
State Comfort switch 1.001 1 bit CT
CONTROL: use for DIP switch Setting à1: UFH, 3: BOTH
it is a command to switch the room operating mode to Comfort, Economy or
Protection.
18 Room operating mode:
State Economy switch 1.001 1 bit CT
19 Room operating mode:
State Protection switch 1.001 1 bit CT
20 Room operating mode:
Window state open/close 1.019 1 bit CWU
STATUS: all DIP switch Settings
A value “1” (open) is received to set operating mode to Protection (UFH) or Off
(VRF) i.e. UFH to Protection, VRF to Off.
A value “0” (close) is received to switch back to the previous operating mode
"Window state" is received from a KNX control device or via the local window
contact X1, X2 (P38, P40).
Note: Only one input source must be used, either local input X1/X2 or KNX bus.
21 Room temperature temperature
value (°C) 9.001 2 bytes CRT
CONTROL: all DIP switch Settings
It is a command to send out the current room temperature measured using built-
in or external sensor (via X1 or X2).
22 Room temp: Comfort
basic setpoint
temperature
value (°C) 9.001 2 bytes CWU
STATUS: all DIP switch Settings
If temporary setpoint function is enabled (P69=ON), after any operating mode
changes, the setpoint will be reset to the Comfort basic setpoint.
Note: User setpoint via the local HMI may be overwritten during a system startup
from a central control unit, e.g.RMB795B.
23 Room temp: Comfort
setpoint
temperature
value (°C) 9.001 2 bytes CWTU
CONTROL/STATUS: all DIP switch Settings
Communication object is used to shift the setpoint for the thermostat. Same
priority as local setpoint shift on the thermostat.
Note: The Comfort basic setpoint (object 22) is not changed.
24 Room temp: Current
setpoint
temperature
value (°C) 9.001 2 bytes CRT
CONTROL: all DIP switch Settings
It is the command to send out for the current setpoint under current operating
mode, including shift, compensation, etc., used by the thermostat for room
temperature control.
25 Heating output
primary
percentage
(0..100%) 5.001 1 byte CRT
CONTROL: use for DIP switch Setting à1: UFH, 3: BOTH
It is a command to send out to indicate the current position of the heating
actuator when UFH is active.
31 VRF Operating Mode:
State
HVAC
control mode 20.105 1 byte CWU
STATUS: all DIP switch Settings
The value of the VRF operating mode is set by a KNX control device.
0 - Auto; 1 - Heat; 3 - Cool; 9 - Fan; 14 - Dry
33 *) Fan operation switch 1.001 1 bit CRWTU CONTROL/STATUS: use for DIP switch Setting à2: VRF
It is a command to set the current fan mode to the VRF: Auto (0); Manual (1).

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Siemens RDF880KN… A6V11282546_en--_a
Building Technologies Touch Screen Flush-mount Room Thermostats with KNX Communications 2018-04-19
Obj. Object Name Function Type Length CRWTU Descriptions / Selections:
visibility depends on DIP switch setting
35 Fan speed:
preselection
percentage
(0..100%) 5.001 1 byte CRWTU
CONTROL/STATUS: use for DIP switch Setting à2: VRF
It is a command to set the fan speed (ECM) – depends on value of P53.
e.g. if P53 = 3, indicates the current fan speed as a value 0...100%
Speed Fan output (physical KNX value)
OFF 0% (0)
1 33% (84 )
2 66% (186)
3 100% (255)
36 Fan speed counter pulses
(0..255) 5.010 1 byte CRT
CONTROL: use for DIP switch Setting à2: VRF
It is a command to set the fan speed – depends on value of P53.
0 – Auto; 1 - Speed 1; 2 - Speed 2; 3 - Speed 3;4 - Speed 4; 5 - Speed 5; 6 - Speed
6; 7 - Speed 7
37 Fan speed status counter pulses
(0..255) 5.010 1 byte CWU
STATUS: use for DIP switch Setting à2: VRF
The value of fan speed received will be set and displayed on HMI.
Speed depends on value of P53:
0 – Auto; 1 - Speed 1; 2 - Speed 2; 3 - Speed 3;4 - Speed 4; 5 - Speed 5;
6 - Speed 6; 7 - Speed 7
38 VRF Operating Mode HVAC
control mode 20.105 1 byte CRT
CONTROL: use for DIP switch Setting à2: VRF
It is a command to set the VRF operating mode for VRF equipment.
0 - Auto; 1 - Heat; 3 - Cool; 9 - Fan; 14 - Dry
39 X1: Temperature temperature
value (°C) 9.001 2 bytes CRT CONTROL: all DIP switch Settings
Indicate the values of the temperature sensors connected to the local inputs
X1/X2 (P38/P40).
41 X2: Temperature temperature
value (°C) 9.001 2 bytes CRT
40 X1: Digital switch 1.001 1 bit CRT CONTROL: all DIP switch Settings
Indicates the logic state of the digital inputs (P39 for X1, P41 for X2).
42 X2: Digital switch 1.001 1 bit CRT
43 Control on/off switch 1.001 1 bit CRT
CONTROL: use for DIP switch Setting à2: VRF
It is a command to turn on and off the VRF equipment.
0 - Off; 1-On
44 Control vane up/down
position
counter pulses
(0..255) 5.010 1 byte CRT
CONTROL: use for DIP switch Setting à2: VRF
It is a command to set the vane position of the VRF equipment.
0 – Auto; 1 - Pos1; 2 - Pos2; 3 - Pos3; 4 - Pos4; 5 - Pos5; 6 - Pos6; 7 - Pos7; 8 - Pos8;
9 - Pos9; 10 - Pos10
45 Control vane up/down
swing boolean 1.002 1 bit CRT
CONTROL: use for DIP switch Setting à2: VRF
It is a command to set the vane to a stop position or auto swing.
The vane position depends on the object, Control vane up/down position (44).
0 - Stop; 1 – Swing
46 Control eco mode start/stop 1.01 1 bit CRT
CONTROL: use for DIP switch Setting à2: VRF
It is a command to enable or disable the ECO mode of the VRF equipment.
0 - Stop; 1 – Start
47 Status on/off Switch 1.001 1 bit CWU
STATUS: use for DIP switch Setting à2: VRF
A value is received from a KNX control device to turn on and off the VRF
equipment. 0 - Off; 1-On
48 Status vane up/down
position
counter pulses
(0..255) 5.010 1 byte CWU
STATUS: use for DIP switch Setting à2: VRF
A value is received from a KNX control device to set the vane position of the VRF
equipment.
0 – Auto; 1 - Pos1; 2 - Pos2; 3 - Pos3; 4 - Pos4; 5 - Pos5; 6 - Pos6; 7 - Pos7; 8 - Pos8;
9 - Pos9; 10 - Pos10
49 Status vane up/down
swing boolean 1.002 1 bit CWU
STATUS: use for DIP switch Setting à2: VRF
A value is received from a KNX control device to set the vane of the VRF
equipment to stop or auto swing. 0 - Stop; 1 – Swing
50 Status eco mode Switch 1.001 1 bit CWU
STATUS: use for DIP switch Setting à2: VRF
A value is received from a KNX control device to set the VRF equipment in ECO
mode. 0 - Off; 1-On
51 Room relative humidity Humidity % 9.007 2 bytes CRT CONTROL: all DIP switch Settings
It is the command to send out for the current value of relative humidity.
53 Room temp: Economy
heating setpoint
temperature
value (°C) 9.001 2 bytes CWU STATUS: all DIP switch Settings
A value is received from a KNX control device to update parameter P11.
55 Application selection:
State
counter pulses
(0..255) 5.010 2 bytes CR
CONTROL: all DIP switch Settings
A value is required to be read out from RDF880KN/NF for the current DIP SW
setting. Refer to dip switch position selection.
1 - UFH only; 2 - VRF only; 3 - both VRF & UFH
56 Sub application:
Preselection
counter pulses
(0..255) 5.010 1 byte CRT
CONTROL: use for DIP switch Setting à3: BOTH
It is a command to send out for the current sub selection below within a combined
UFH and VRF/VRF unit.
1 - UFH only; 2 - VRF only; 3 - both VRF & UFH
57 Sub application:
State
counter pulses
(0..255) 5.010 1 byte CWU
STATUS: use for DIP switch Setting à3: BOTH
A value is received from a KNX control device for the current sub selection below
within a combined UFH and VRF/VRF unit.
1 - UFH only; 2 - VRF only; 3 - both VRF & UFH
C: Communication; R: Read; W: Write; T: Transmission; U: Update
Notes: The current RDF880KN/NF is based on a Floor Heating Controller with additional VRF HMI. Therefore, to turn on the controller, effectively, it is to turn on the UFH application.
1. In a UFH application selected via DIP switch setting or remote configuration, the operations are identical to RDD810KN/NF while all VRF relevant S-mode objects are invisible.
2. In a VRF application selected via DIP switch setting or remote configuration, UFH application will not be turned ON remotely via any KNX control devices or locally via HMI.
3. In a combined application (both UFH and VRF) selected via DIP switch setting or remote configuration, the object Sub Application (56, 57) can be used by any KNX control devices
to do remote selection of applications (UFH only, VRF only or UFH & VRF) required. But the objects: Time Switch/Schedule (12, 13, 14, and 15) or ECO mode (10, 18) via any KNX
control devices remotely will turn on/off both VRF and UFH. Therefore, it is not recommended to use objects: Time Switch/Schedule (12, 13, 14, and 15) or ECO mode (10, 18).
*) If object Fan operation (33) is used together with object Fan speed (36), the value “0 – Auto” of object Fan speed (36) cannot be used. If these two objects are not used together, the
value “0 – Auto“ can be used.

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Siemens RDF880KN… A6V11282546_en--_a
Building Technologies Touch Screen Flush-mount Room Thermostats with KNX Communications 2018-04-19
Disposal
The device is considered electrical and electronic equipment for disposal in terms of
the applicable European Directive and may not be disposed of as domestic garbage.
·Dispose of the device through channels provided for this purpose.
·Comply with all local and currently applicable laws and regulations.

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Siemens RDF880KN… A6V11282546_en--_a
Building Technologies Touch Screen Flush-mount Room Thermostats with KNX Communications 2018-04-19
Technical data
Power supply Rated voltage AC 230 V
Overvoltage category III
Frequency 50/60 Hz
Power consumption Max. 6.0 VA / 2.1 W
No internal fuse.
External preliminary protection with max C 10 A circuit breaker required in all cases.
Outputs Control output Q11, Q12, Q14 (SPDT)
Rating Min, Max resistive (inductive)
AC 24…230 V
Min. 10 mA, Max. 5(2) A
No internal fuse.
External preliminary protection with max C 10 A circuit breakers in the supply line
(Q11) required in all cases.
Inputs Multifunctional input X1-M/X2-M
Temperature sensor input:
Type
Temperature range
Cable length
Digital input:
Operating action
Contact sensing
Parallel connection of several thermostats
for one switch
Insulation against mains voltage (SELV)
See “Equipment combinations”
0...49 °C
Max. 80 m
Selectable (NO / NC)
SELV DC 0...5 V / Max. 5 mA
Max. 20 thermostats per
switch
4 kV, reinforced insulation
Function of inputs:
External temperature sensor, window contact, fault
contact, monitoring input
Selectable
X1: P38
X2: P40
KNX bus Interface type KNX, TP1-64
(electrically isolated)
Bus current 5 mA
Bus topology: See KNX manual (Reference documentation, see below)
Operational data Switching differential, adjustable
Heating mode (P30) 1 K (0.5...6 K)
Setpoint setting and range
Comfort (P08)
Economy (P11)
Protection (P65)
21 °C (5...40 °C)
15 °C (OFF, 5...40 °C)
8 °C (OFF, 5...40 °C)
Multifunctional input X1/X2
Input X1 default value (P38)
Input X2 default value (P40)
Selectable 0, 1, 3, 6, 7, 8
0 (no function)
0 (no function)
Built-in room temperature sensor
Measuring range
Accuracy at 25 °C
Temperature calibration range
0…49 °C
< ± 0.5 K
± 5.0 K
Settings and display resolution
Setpoints
Current temperature value displayed
Built-in room humidity sensor
Measuring range
Accuracy at 25 °C
Humidity calibration range
Settings and display resolution
Display resolution
0.5 °C
0.5 °C
0…100%
± 5% r.h.
± 20%
1% r.h.
Caution
Caution