Gewiss CHORUS GW 16976CB User manual

KNX Thermo ICE Thermostat (surface-mounting)
Photo: GW16976CN - Black
GW 16976CB - GW 16976CN - GW 16976CT
Technical Manual

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Contents
1Introduction.................................................................................................................................................5
2Application..................................................................................................................................................5
2.1 Association limits...........................................................................................................................................7
3“Information” menu .....................................................................................................................................8
4“Main” menu ...............................................................................................................................................8
4.1 Parameters of the..........................................................................................................................................9
4.1.1 Delay time from power on and first transmission.......................................................................................... 9
4.1.2 Thermostat functioning............................................................................................................................... 10
4.1.3 Functioning type setting.............................................................................................................................. 11
4.1.4 Parameters local modification and Base parameters values overwrite during download ........................... 12
4.1.5 Plate cleaning function................................................................................................................................ 12
4.1.6 Hour modification via BUS.......................................................................................................................... 13
4.1.7 Master/Slave control type orstand alone..................................................................................................... 15
4.1.8 Remote parameters setting ........................................................................................................................ 16
4.1.9 Heating/Cooling control logics and algorithms............................................................................................ 21
4.2 Control algorithms .......................................................................................................................................28
4.2.1 Two points ON-OFF.................................................................................................................................... 28
4.2.2 Two points 0% - 100%................................................................................................................................ 29
4.2.3 Integral proportional PWM.......................................................................................................................... 29
4.2.4 Continuous proportional integral................................................................................................................. 33
4.2.5 Fan coil with ON-OFF speed control (ON-OFF) ......................................................................................... 35
4.2.6 Fan coil with 0%-100% speed control (0-100%)......................................................................................... 38
5“Heating” menu.........................................................................................................................................39
5.1 Parameters of the........................................................................................................................................39
5.1.1 Regulation parameters for the heating valve .............................................................................................. 39
5.1.2 Regulation parameters for the fan coil heating valve.................................................................................. 41
5.1.3 Regulation parameters for the fan coil speed............................................................................................. 42
5.1.4 Valve status feedback parameters ............................................................................................................. 45
5.1.5 Fan speed status feedback parameters...................................................................................................... 46
5.1.6 Second stage heating................................................................................................................................. 47
6“Air-Cooling” menu ...................................................................................................................................49
6.1 Parameters of the........................................................................................................................................49
6.1.1 Regulation parameters for the cooling valve............................................................................................... 49
6.1.2 Regulation parameters for the fan coil cooling valve .................................................................................. 51
6.1.3 Regulation parameters for the fan coil speed............................................................................................. 52
6.1.4 Valve status feedback parameters ............................................................................................................. 55
6.1.5 Fan speed status feedback parameters...................................................................................................... 55
6.1.6 Second stage cooling ................................................................................................................................. 57
7“Setpoint temperature” menu ...................................................................................................................59
7.1 Parameters of the........................................................................................................................................59
7.1.1 Parameters for Heating............................................................................................................................... 59
7.1.2 Parameters for Cooling............................................................................................................................... 61
7.1.3 Shared parameters..................................................................................................................................... 62
8“Temperature Sensors” menu ..................................................................................................................64
8.1 Parameters of the........................................................................................................................................64
8.1.1 Parameters of the built-in sensor................................................................................................................ 64
8.1.2 Parameters of the external sensor KNX ..................................................................................................... 65
8.1.3 Parameters of the auxiliary sensor ............................................................................................................. 66
9“Feedbacks” menu....................................................................................................................................70
9.1 Parameters of the........................................................................................................................................70
9.1.1 Measured temperature ............................................................................................................................... 70
9.1.2 HVAC mode feedback................................................................................................................................ 71
9.1.3 Functioning type feedbacks........................................................................................................................ 72
9.1.4 Functioning setpoint feedback.................................................................................................................... 73
9.1.5 Current setpoint report................................................................................................................................ 73
9.1.6 Thermostat functioning feedback................................................................................................................ 74
9.1.7 HVAC mode setpoint feedback................................................................................................................... 74
9.1.8 Setpoint OFF mode feedback..................................................................................................................... 75

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9.1.9 Feedback sending trigger object................................................................................................................. 75
10 “Scenes” menu .........................................................................................................................................76
10.1Parameters of the........................................................................................................................................76
10.1.1 Scenes function.......................................................................................................................................... 76
10.1.2 Scene number n (1 ≤ n ≤ 8) ........................................................................................................................ 77
10.1.3 Parameters to memorize while storing........................................................................................................ 77
11 “Humidity” menu .......................................................................................................................................78
11.1Parameters of the........................................................................................................................................78
11.1.1 Internal sensor correction factor [% UR]..................................................................................................... 78
11.1.2 Measured relative humidity......................................................................................................................... 78
11.1.3 KNX external humidity sensor .................................................................................................................... 79
11.1.4 Humidity estimation mode .......................................................................................................................... 80
11.1.5 Specific Humidity........................................................................................................................................ 81
12 “Relative humidity threshold X” menu ......................................................................................................83
12.1Parameters of the........................................................................................................................................83
12.1.1 Relative humidity threshold X..................................................................................................................... 83
12.1.2 Measure to use as reference...................................................................................................................... 84
12.1.3 Threshold logic functioning......................................................................................................................... 84
12.1.4 Limit threshold starting value [%UR]........................................................................................................... 85
12.1.5 Change the threshold via BUS ................................................................................................................... 85
12.1.6 Enable/disable the Humidity threshold (via BUS and device menu)........................................................... 86
12.1.7 Send communication objects on the basis of Conditions 1/2...................................................................... 86
13 “Thermal comfort” menu ...........................................................................................................................92
13.1Parameters of the........................................................................................................................................92
13.1.1 Enable thermal sensor feedback................................................................................................................ 92
13.1.2 Summer/Winter season.............................................................................................................................. 93
13.1.3 Limit conditions for comfort in summer/winter............................................................................................. 93
14 “Dewpoint” menu ......................................................................................................................................95
14.1Parameters of the........................................................................................................................................95
14.1.1 Dewpoint temperature ................................................................................................................................ 95
14.1.2 Dewpoint alarm........................................................................................................................................... 96
15 “Display and touch” menu ......................................................................................................................100
15.1Standard operating mode (stand alone or slave)......................................................................................101
15.2Hotel operating mode (simplified slave) ....................................................................................................102
15.3Parameters................................................................................................................................................103
15.3.1 Circular slider function for reference temperature regulation.................................................................... 104
15.3.2 Temperature measurement unit ............................................................................................................... 105
15.3.3 Proximity sensor....................................................................................................................................... 105
15.3.4 Display information rotation in stand-by.................................................................................................... 105
15.3.5 Display in stand-by................................................................................................................................... 106
15.3.6 Backlight brightness intensity percentage value....................................................................................... 107
15.3.7 Sound effect for “Touch” events ............................................................................................................... 107
16 “Window contact” menu..........................................................................................................................108
16.1Parameters................................................................................................................................................108
16.1.1 KNX window external contact................................................................................................................... 108
16.1.2 Logical interpretation of the open window status...................................................................................... 109
16.1.3 Delay time for the action of window contact.............................................................................................. 109
17 “Logic” menu...........................................................................................................................................110
17.1Parameters................................................................................................................................................110
17.1.1 Logic function ........................................................................................................................................... 110
17.1.2 Logic input “ì” (with ì = 1..8) ...................................................................................................................... 111
17.1.3 NOT operation for Logic input “ì” .............................................................................................................. 111
17.1.4 Operation between logic inputs ................................................................................................................ 111
17.1.5 The logic operation is computed............................................................................................................... 111
17.1.6 Generate the result of the logic operation................................................................................................. 112
17.1.7 If the result of the logic operation is TRUE/FALSE................................................................................... 112
18 Device start-up procedure......................................................................................................................113
18.1Factory Reset............................................................................................................................................113
18.2Procedure for activating the physical address or KNX individual address programming mode: “PROG”
status.................................................................................................................................................................113

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19 ETS programming error feedback..........................................................................................................115
20 Device malfunctioning error feedback....................................................................................................117
21 Device malfunctioning warning feedback...............................................................................................118
21.1Feedback from external devices ...............................................................................................................118
21.2Feedback of ETS download in progress ...................................................................................................120
22 Communication objects..........................................................................................................................121

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1 Introduction
This manual describes the functions of the “KNX Thermo ICE Thermostat (surface-mounting)” (GW16976CB
- GW16976CN - GW16976CT) device and how theyare set and configured with the aid of the ETS configuration
software.
2 Application
The KNX THERMO ICE (surface-mounting) manages the temperature of the room where it's installed, and can
also manage a humidification/dehumidification system alongside the temperature control system, or intervene
on the temperature control system to regulate the Humidity in the air.
The temperature and Humidity are regulated by commanding - via the KNX BUS - the KNX actuators that control
the heating or cooling elements (including the fan coils or actuators dedicated to those elements - e.g.
GWA9140, GWA9141) or the humidification/dehumidification elements.
The thermostat can work in “stand alone” control mode to autonomously manage the temperature control system
(or parts of it), whereas in combination with a master device (e.g. a KNX timed thermostat or the Smart Gateway)
it can work in “slave” control mode and create multi-zone temperature control systems. The thermostat can also
be used in “hotel” mode, limiting its functions and the modifications that can be made locally by the user by
means of a simplified interface.
The setpoint values used by the thermostat are the ones configured via ETS, and they can be modified locally
and via the BUS (if these options were enabled during the ETS configuration).
The device supports KNX Data Secure: this technology enhances the security of a KNX installation both during
start up and during normal operation, thanks to the exchange of encrypted telegrams.
The thermostat offers:
•2 functioning types: heating and cooling, with independent control algorithms;
•4 HVAC operating modes: OFF (frost protection / high temperature protection), Economy, Precomfort and
Comfort;
•4 regulation temperatures for heating (Teconomy, Tprecomfort, Tcomfort, Tantigelo);
•4 regulation temperatures for cooling (Teconomy, Tprecomfort, Tcomfort, Thigh temperature protection);
•3 control modes: stand alone, slave (if combined with a master device) or hotel (Slave with a simplified
graphic interface);
•2 control types: HVAC or Setpoint;
•2 control stages: single stage (with single switching command) or dual stage (with dual switching command,
for systems with a high degree of thermal inertia);
•control algorithms for 2-pipe or 4-pipe systems (first stage): 2 points (ON/OFF command or 0%-100%),
proportional PI (PWM type control or continuous), fan coil (max. 3 speeds or continuous control 0%-100%);
•control algorithms (second stage): 2 points (ON/OFF command or 0%-100%);
•1 input that can be configured for an NTC external temperature sensor (e.g: floor heating protection sensor).
The thermostat has a backlit display with white LEDs, with sensitive rear-projected areas on a plate. It requires
an external 110-230V AC power supply and has a built-in sensor for measuring the temperature and ambient
humidity (the values are sent on the BUS with a parameterised frequency or following a variation) and a proximity
sensor to activate the backlighting when the user approaches the device.
The device can be configured with the ETS software to carry out the following functions:
Temperature control
•at 2 points, with ON/OFF commands or 0%-100% commands;
•proportional integral control, with PWM commands or continuous regulation (0%-100%).
Fan coil management
•fan coil speed control, with ON/OFF 3-speed selection commands or continuous regulation (0%-100%).
•management of 2-way or 4-way systems, with ON/OFF commands or continuous regulation (0%-100%).
Operating mode setting

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•via the BUS, with distinct 1-bit objects (OFF, ECONOMY, PRECOMFORT, COMFORT);
•via the BUS, with 1-byte objects.
Operating setpoint definition
•via the BUS, with 2-byte objects.
Temperature measurement
•with the built-in sensor;
•with a combination of built-in sensor/external sensor KNX/external sensor NTC , with the definition of
the relative weights.
Relative humidity measurement
•with the built-in sensor;
•with a combination of built-in sensor/external sensor KNX , with the definition of the relative weights;
•setting of up to 5 Relative humidity thresholds, with BUS commands sent when the threshold is
exceeded and restored:
- 1 bit, 2 bit, 1 byte commands to act on the humidification/dehumidification system;
- HVAC mode commands to get feedback from the heating/cooling system;
- setpoint values to get feedback from the heating/cooling system;
•calculation of the specific humidity;
•Thermal comfort status indicator.
Underfloor probe
•setting of threshold value for floor temperature alarm.
Temperature control for specific zones
In “slave” or “hotel” control mode:
•with the operating mode received by the master device, and the use of a local setpoint ;
•with the setpoint value received by the master device, and the local temperature differential.
In “stand alone” control mode:
•with the local selection of the operating mode and setpoints;
•with the local selection of the operating setpoint.
Scenes
•memorisation and activation of 8 scenes (value 0 - 63)
Other functions
•definition of the setpoint (OFF, ECONOMY, PRECOMFORT, COMFORT) via the BUS;
•definition of the operating setpoint via the BUS;
•setting of the functioning type (heating/cooling) via the BUS;
•transmission of the status information (mode, type), measured temperature and humidity, and current
setpoint on the BUS;
•management of the status information arriving from the commanded actuator;
•management of the window status information for temporarily switching off the thermostat;
•AND/NAND/OR/NOR/XOR/XNOR logic operations with up to 8 logic inputs;
•Dewpoint;
•management of the display parameters.

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2.1 Association limits
Maximum number of group addresses: 254
Maximum number of associations: 254
This means that up to 254 group addresses can be defined, and up to 254 associations can be made (between
communication objects and group addresses).

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3 “Information” menu
Like every KNX device, this one requires first of all the programming of the physical or individual address during
the initial start-up. This is not done by pressing a push-button and dedicated programming LED, as is the case
with most devices, but directly from the menu of the touchscreen display of the ICE thermostat.
This menu shows, in a graphic format, how to access the “PrG” page for activating the programming mode for
the KNX physical address.
Fig 3.1 –“Information” menu
When the device starts up, the display will automatically show “PrG”, indicating that the first thing to do is
program the thermostat with the physical address.
To confirm, press the central “Mode” button key and then program the physical address.
Physical address programming mode can be accessed (e.g. if it needs to be changed) by pressing and holding
the right-hand button key “Next” for 10 seconds while on any of the main pages (Temperature, Humidity, Time,
Fan speed). To quit programming mode, press the green SET push-button.
For more information about the programming of the physical or individual address of the KNX
device, see paragraph 18.2.
4 “Main” menu
The Main menu contains the parameters for enabling the various functions implemented by the device, and for
setting the main operating parameters.

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Figure 4.1 shows the structure of the menu:
Fig. 4.1 –“Main” menu
4.1 Parameters of the
4.1.1 Delay time from power on and first transmission
To ensure that, with several devices in the line, the telegrams sent by the various devices do not collide when
the BUS voltage is reset, you can define a time limit after which the device can transmit the telegrams on the
BUS following a BUS voltage failure/reset. The “4.1.1 Delay time from power on and first transmission”
parameter is used to define this delay.
The values that can be set are:
-11..21 seconds (depending on physical address) (default value)
-5..9 seconds (depending on physical address)
-11 seconds
-13 seconds
-15 seconds
-17 seconds
-19 seconds
-21 seconds
-0 seconds (no delay)

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If the values 11..21 seconds (depending on physical address) 5..9 seconds (depending on physical
address) are set, the device automatically calculates the transmission delay on the basis of an algorithm that
examines the physical address of the device itself; the values indicated (11/21 or 5/9) indicate the minimum and
maximum limits of the value range that can be calculated.
Note that this parameter therefore merely sets a delay for transmitting the telegrams in the first few seconds
after the first switch-on. It does not in any way hamper the user's interaction with the graphic interface of the
device.
The delay following the reset of the 230V supply rather than just the BUS voltage may be different even if the
same value is set, because in the first case the device must actually start up while in the second it might already
be active if the 230V supply hasn't failed.
4.1.2 Thermostat functioning
The “Thermostat functioning [P28]”parameter defines the function of the thermostat inside the KNX
temperature control system. The values that can be set are:
Stand Alone (default value)
The device autonomously manages the temperature control system (or part of it) without the aid of the
timed thermostats connected to it, that control parts of the system. With this configuration, there is a
single temperature control centre for the room.
If this value is selected, the “Stand Alone control type” and “Remote parameters setting”
parameters are displayed.
slave
The device is configured so it can manage the temperature control system with the aid of a “master”
device such as a timedthermostat.With this configuration, the device does not control the entire system
but only a part of it (a “zone”); there is a “master” device in the system that controls its functioning type
and mode In this case, the thermostat controls the temperature of the room where it is located, but it is
the “master” device that decides the operation set by the user. The HVAC mode of the device cannot
be modified locally.
If this value is selected, the “Master/Slave control type”, “Temporary setpoint forcing via bus” and
“Allow local switching off” parameters are displayed, along with the Functioning type input (Data
Point Type: 1.100 DPT_Heat/Cool) and Enabling Slave function (Data Point Type: 1.003
DPT_Enable) communication objects.
hotel (simplified slave mode)
The device has the same operating characteristics as in slave mode, but with an even simpler graphic
interface and thermostat usage limits in keeping with the functioning type in a hotel context. A single,
central button key is used to move between the thermostat pages to personalise the temperature
setpoint (and also the fan speed setpoint if the control algorithm is of the fan coil type). The thermostat
can also be switched off, or returned to automatic control. It is not possible to access the menus to
configure the parameters (whether standard or advanced) in this mode. If this value is selected, the
same parameters and objects as for functioning type slave are made visible.
For the purpose of simplicity, the word “slave” will be used in the following paragraphs to refer to both the “slave”
and “hotel” (slave simplified) operating modes. In terms of the operating concept, these two modes both overlap
with “stand alone”mode. hotel mode will be explicitly referred to only when it is necessary to indicate the
differences - i.e. any specific functions that it alone has.
The L’Communication objects Enabling Slave function modifies - via a BUS telegram - the operating mode of
the thermostat: stand alone (value 0) or slave/slave simplified (value 1).

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4.1.3 Functioning type setting
The device functioning type temperature control (heating/cooling) can be managed either manually or
autonomously (by the device itself). The manual method can be managed via the local navigation menu or BUS
commands that allow switching between types, changing the dedicated parameter. The automatic method is
based on the principle of an interdiction area, or “dead zone”, i.e. the temperature gap between the setpoints of
the HVAC heating and cooling modes (see figure below), allowing the automatic switching from one functioning
type to the other.
The above figure shows that as long as the measured temperature is below the setpoint for Heating, the
functioning type is HEATING; in the same way, if the measured value is higher than the setpoint for Cooling,
then the functioning type is COOLING. If the measured value is within the interdiction area, the functioning type
remains as before. The functioning type HEATING → COOLING switching point corresponds to the setpoint of
the cooling HVAC mode. Likewise, the switch COOLING → HEATING is made in conjunction with the heating
setpoint. In any case, a functioning type can be forced via the local menu or via a BUS command.
Regardless of the set functioning type (stand alone or slave), the “Functioning type setting”parameter can
be used to define how the functioning type is modified. The values that can be set are:
-Automatically (“dead zone”)
-By local command or from BUS (default value)
If the operating type is slave, the l’Communication objects Enable dead zone (Data Point Type: 1.003
DPT_Enable) is visualised in order to enable the dead zone if necessary.
Only if the dead zone is disabled via a BUS command on the Object Enable dead zone or via the device menu
(Heat/Cool/Auto) will the active functioning type remain the one set in that moment; it can then be modified via
a BUS command on the Object Functioning type input (Data Point Type: 1.100 DPT_Heat/Cool), via the menu,
or via Scenes. In the case of Scenes, refer to the specific paragraph. Scene can also memorise the activation
status of the dead zone and therefore re-enable its activation if necessary.

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4.1.4 Parameters local modification and Base parameters values overwrite
during download
The “Parameters local modification”parameter is used to enable or otherwise the modification of the
thermostat operating parameters via the relative local menu. The values that can be set are:
disabled
basic parameters only (default value)
basic and advanced parameters
Refer to the “User Manual” where you can see the structure of the local navigation menu and the various
access levels (basic/advanced) that can be reached using the command push-buttons on the device itself.
If the value basic parameters only is selected, the user can only access the basic SET menu.
If basic and advanced parameters is selected, the user can access both the basic SET menu and the
advanced one.
The “Base parameters values overwrite during download” parameter defines whether or not the value of
the parameters that can also be modified from the basic SET menu of the device should be overwritten following
a subsequent download of the ETS application software. The values that can be set are:
no
yes (default value)
By setting no, the parameter values are saved in a non-volatile memory and reset when the device is relaunched.
In this case, the values of the parameters that can be modified from the basic SET menu and received via ETS
will be ignored and the ones modified via the device menu will remain valid.
The “Advanced parameters values overwrite during download” parameter defines whether or not the value
of the parameters that can also be modified from the advanced SET menu of the device should be overwritten
following a subsequent download of the ETS application software. The values that can be set are:
no
yes (default value)
By setting no, the parameter values are saved in a non-volatile memory and reset when the device is relaunched.
In this case, the values of the parameters that can be modified from the advanced SET menu and received via
ETS will be ignored and the ones modified via the device menu will remain valid.
4.1.5 Plate cleaning function
The “Plate cleaning function”parameter enables the inhibition of the capacitive sensors to allow the
technopolymer surface to be cleaned. The values that can be set are:
disable
enable (default value)
If enable is selected, the “Inhibition time [s]”parameter is displayed, along with the l’Communication objects
Plate cleaning function (Data Point Type: 1.010 DPT_Start).
The “Inhibition time [s]”parameter defines the sensor inhibition period. The values that can be set are:
from 10 to 240 in steps of 1 (default value 30)
While the cleaning function is active, all the push-buttons and the circular slider are deactivated, and the
Inhibition time [s] countdown is shown on the display.

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The exact cleaning function activation and deactivation moments are signalled to the user via a special sound
effect (used only with this function) and a special light effect (also used only with this function) on the backlighting
of the touch push-buttons and the slider.
There are two ways of activating the Plate cleaning function:
1. Manual activation:
Enabling
Touch the north sector of the circular slider and the MODE button key > 3 seconds simultaneously
(regardless of the order)
You will hear a short beep (if the acoustic signal for the Plate cleaning function is enabled)
The touch push-buttons will flash simultaneously (if the light signal for the Plate cleaning function is
enabled)
The flashing will stop and the countdown will be shown on the display
Disabling
Timeout Inhibition time [s]
You will hear a short beep (if the acoustic signal for the Plate cleaning function is enabled)
The touch push-buttons will flash simultaneously (if the light signal for the Plate cleaning function is
enabled)
The flashing will stop and the previous feedbacks will again be shown on the display
2. Activation via BUS commands:
The l’Communication objects Plate cleaning function (1.010 DPT_Start)can be used to start the timed
activation of the cleaning function via a BUS command with the logic value “1”. The function is automatically
deactivated when the time set in the “Inhibition time [s]” parameter has elapsed, or it can be deactivated
with a BUS command with the logic value “0”. The arrival of a BUS command with the logic value “1” and
active timing leads to the resetting of the sensor inhibition time.
4.1.6 Hour modification via BUS
The “Hour modification via bus”parameter can be used to enable the modification of the time via BUS
telegrams. The values that can be set are:
disable (default value)
enable

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If enable is selected, the l’Communication objects Time input (Data Point Type: 10.001 DPT_TimeOfDay) is
visualised, allowing the device to receive the values for the day of the week and the time from the BUS. The
information about the day of the week is not used by the device.
When the BUS or auxiliary voltage is restored, the status read command (read request) should be sent via the
Object Time input in order to update the time shown.
The thermostat, in fact, does not keep the time information up to date following a power supply failure; at the
next restart, the time shown will be the one active when the power supply was lost. If the failure lasts for some
time therefore, the time data must be reset manually via the menu, or sent to the Time input (Data Point Type:
10.001 DPT_TimeOfDay) communication object via the KNX BUS.
The “Hour sending via bus”parameter is used to enable or disable the transmission of the current day and
time set on the device to other devices in the KNX system.
The values that can be set are:
disabled (default value)
periodically
after a blockout
after a blockout or a local change
after a blockout, local change or periodically
If any value other than disabled is selected, the l’Communication objects Time sending (Data Point Type:
10.001 DPT_TimeOfDay) is visualised, allowing the transmission of the day and time on the BUS according to
the criteria set for the parameter in question. The information about the day of the week is not sent by the device.
Setting the transmission of the day and time after the failure of the KNX BUS*, the device sends the BUS
telegrams with the current time and day when the BUS voltage is reset.
*ATTENTION: if the KNX BUS voltage failure coincides with a 230V AC power supply failure, the day and time
information will not be sent because it might not be correct.
The information transmitted or received via the Hour (Time) field of DPT_TimeOfDay always includes any
possible increase (+1h) due to the application of daylight saving time (Summer Time / Daylight saving time -
DST).
Setting the transmission after a local change, the device will send the new values on the BUS when a
modification is made to the day/time on the device itself (via the local SET navigation menu - see “Command
push-buttons and local menu” in the User Manual. If the time is modified following the arrival of a sull’Object
Time input BUS telegram, the update is not signalled by the thermostat to avoid repetitions.
Setting periodically, the device sends the values with the frequency defined by the value set in the “Hour
sending period”parameter.
The parameter can have the following values:
6 hours
12 hours
1 day
2 days
3 days
4 days
5 days
6 days
1 week (default value)
To automatically change the time during the switch from daylight saving time to standard time, there is a specific
communication objects that indicates which system is being used.

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The “Set daylight saving time from bus”parameter is used to enable and visualise the communicationobjects
Daylight saving time input (Data Point Type: 1.001 DPT_Switch), which the device uses to obtain information
about the status of the time system being used. The values that can be set are:
disable(default value)
enable
If enable is selected, the communication objects Daylight saving time input and the “Object ""Daylight
saving time"" value at ETS download” parameter are visualised, defining the current time system when the
application is downloaded. The values that can be set are:
standard time (default value)
daylight saving time
Time is managed as follows: on the switch from standard time to daylight saving time, the device automatically
adds one hour to the set time; on the switch from daylight savingtime to standard time, the device automatically
subtracts one hour from the set time. These addition and subtraction operations only take place with the
switching from one system to the other, not every time the status information is received via the object. Value
“1” corresponds to daylight saving time, value “0” to standard time.
If the device time is modified locally or via a BUS telegram, the device does not make any change to the new
set time.
4.1.7 Master/Slave control type orstand alone
If the device acts as a slave (or simplified slave), it can be controlled by the master device via a single setpoint
or by changing the active HVAC mode. The “Master/Slave control type”parameter is used to set the type of
control that the master device has on the thermostat. The values that can be set are:
HVAC mode (default value)
setpoint
If HVAC mode is selected, the “Commands format for HVAC mode remote setting” e “HVAC mode
setpoint modification via bus”parameters are displayed.
If is selected setpoint, the parameter is displayed “Change the functioning setpoint via bus through”.
If the device functions as "stand alone", it is possible to define whether only one operating setpoint should be
managed or whether the operation should be managed via the HVAC modes.
The “Stand alone control type” parameter sets the control type to be used. The values that can be set are:
standard
time
daylight
saving time
0 / hour = hour - 1
1 / hour = hour + 1
0 / -
1 / -
“object value” / “operation to be carried out”

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HVAC mode (default value)
setpoint
4.1.8 Remote parameters setting
Even if the device functions as stand alone, it can still receive various commands from remote units via the BUS.
The “Remote parameters setting”parameter visualises the various configuration items for remote thermostat
control. The values that can be set are:
disable(default value)
enable
If enable is selected, the “Commands format for HVAC mode remote setting”and “HVAC mode setpoint
modification via bus”parameters are displayed (if the control type is HVAC mode) or the “Change the
functioning setpoint via bus through” parameter (if the control type is setpoint), along with the “Temporary
setpoint forcing via bus”, “Reset temporary setpoint forcing via bus”and “Functioning type”parameters.
The “Commands format for HVAC mode remote setting” parameter defines the format of the communication
objects used for the remote control of the thermostat HVAC modes. The values that can be set are:
1 bit
1 byte (default value)
both
If 1 byte or both is selected, the communication objects HVAC mode input (Data Point Type: 20.102
DPT_HVACMode) is visualised so the remote device can change the HVAC mode via a single command.
If 1 bit or both is selected, the “Priority between objects for HVAC mode remote setting”parameter and
the HVAC mode input off, HVAC mode input economy, HVAC mode input precomfort,HVAC mode input
comfort (Data Point Type: 1.003 DPT_Enable) communication objects are visualised so the relative HVAC
mode can be activated.
If the control type is setpoint on the other hand, only one communication objects is visualised, allowing the
thermostat to be switched off (and switched back on) via the KNX BUS: Setpoint OFF input (Data Point Type:
1.003 DPT_Enable). If this communication objects receives the value 1 (enable), it triggers the switch to the
thermostat OFF status; vice versa, the value 0 (disable) brings the device back to normal operation setpoint.
The “Priority between objects for HVAC mode remote setting”parameter defines whether there is any
priority between the communication objects dedicated to remote HVAC mode setting. The values that can be
set are:
disable
The 1-bit communication objects HVAC mode input off, HVAC mode input economy, HVAC mode
input precomfort,HVAC mode input comfort and the 1 byte HVAC mode mode input all have the
same priority; it is the last command received that determines the HVAC mode to be activated. This
means that the arrival of the value “0” on the communication objects of 1 bit that activated a certain
HVAC mode is ignored, and that mode remains active. With this setting, the priority between the various
device functions and the different communication objects used for setting the HVAC mode is as follows:

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Function/Object
Size
Priority
Reactivation after manual switch-off (if reactivation is manual and via
remote commands)
-
1
low
Local operating mode change (Mode button key)
-
2
Scene
1 byte
2
HVAC mode input (Setpoint input)
1 byte (2 byte)
2
HVAC mode input comfort
1 bit
2
HVAC mode input precomfort
1 bit
2
HVAC mode input economy
1 bit
2
HVAC mode input off
1 bit
2
Reactivation after manual switch-off (if reactivation is only manual)
3
Manual switch-off
4
window contact function via BUS
-
5
high
enable (default value)
The communication objects of 1 bit HVAC mode input off, HVAC mode input economy, HVAC mode
input precomfort,HVAC mode input comfort and the one of 1 byte HVAC mode mode input all have
different priorities; the command with the highest priority is the one that determines the HVAC mode to
be activated. This setting visualises the “Reception 1 bit mode with priority > actual”, “Reception 1
bit mode with priority < actual” parameters, and the priority between the various device functions and
the different communication objects used for the HVAC mode setting is as follows:
Function/Object
Size
Priority
Reactivation after manual switch-off (if reactivation is manual and via
remote commands)
-
1
low
Local operating mode change (Mode button key)
-
2
Scene
1 byte
2
HVAC mode input (Setpoint input)
1 byte (2 byte)
2
HVAC mode input comfort
1 bit
3
HVAC mode input precomfort
1 bit
4
HVAC mode input economy
1 bit
5
HVAC mode input off
1 bit
6
Reactivation after manual switch-off (if reactivation is only manual)
7
Manual switch-off
8
Window contact function via BUS
-
9
high
The 1 bit mode setting objects all have a higher priority than the mode setting object of 1 byte; this is due to the
fact that, by enabling both mode-setting possibilities, the 1-bit objects can be used to fix the mode if particular
events occur.
Naturally there is also a command execution priority between the 1 bit mode setting objects, especially because
if only the 1 bit format is defined for the operating mode setting but several objects are enabled, it is necessary
to determine which of them has the highest priority in order to define the active device operating mode.
As several 1 bit objects can be enabled at the same time, we can define the behaviour of the device if a
communication objects with a higher priority than the one currently active is received; this is done via the
“Reception 1 bit mode with priority > actual”parameter. In the same way, we can define the behaviour of
the device if a communication objects with a lower priority than the one currently active is received; this is done
via the “Reception 1 bit mode with priority < actual”parameter.
The values that can be set for the “Reception 1 bit mode with priority > actual” parameter are:
keep lower priority objects value (default value)
deactivate object with lower priority
If keep lower priority objects value is selected and a 1-bit HVAC mode activation command with a higher
priority than the currently active one is received, the mode of the new object will be set but the activation status
of objects with a lower priority will be maintained.

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Vice versa, if deactivate object with lower priority is selected and a 1-bit HVAC mode activation command
with a higher priority than the currently active one is received, the mode of the new object will be set and the
activation status of objects with a lower priority will be set at 0 (deactivated).
The values that can be set for the “Reception 1 bit mode with priority < actual” parameter are:
update object value (default value)
ignore command
If update object value is selected and a 1-bit HVAC mode activation command with a lower priority than the
currently active one is received, the mode of the new object will not be set but its activation status will be stored.
Vice versa, if ignore command is selected and a 1-bit HVAC mode activation command with a lower priority
than the currently active one is received, the new command will be ignored (as if it had not been received).
The “HVAC mode setpoint modification via bus” parameter is used to enable the communication objects
needed to define the setpoints of each device mode via a BUS telegram. The values that can be set are:
disable (default value)
enable absolute value setting [°C]
enable absolute value setting (K)
enable absolute value setting [°F]
enable increase/decrease step regulation
Selecting enable absolute valute setting visualises the following communication objects:
Heating anti-freeze setpoint input
Heating economy setpoint input
Heating precomfort setpoint input
Heating comfort setpoint input
Air-cooling high temp. protection setpoint input
Air-cooling economy setpoint input
Air-cooling precomfort setpoint input
Air-cooling comfort setpoint input
(Data Point Type: 9.001 DPT_Value_Temp se °C, 9.002 DPT_Value_Tempd se K e 9.027 DPT_Value_Temp_F
se °F) , with which the setpoints of each device operating mode can be defined via the BUS.
Selecting enable increase/decrease step regulation visualises the following communication objects:
Heating anti-freeze setpoint regulation
Heating economy setpoint regulation
Heating precomfort setpoint regulation
Heating comfort setpoint regulation
Air-cooling high temp. protection setpoint regulation
Air-cooling economy setpoint regulation
Air-cooling precomfort setpoint regulation
Air-cooling comfort setpoint regulation
(Data Point Type: 1.007 DPT_Step) , with which the setpoints of each mode can be regulated.
Every time the value “1” is received, the associated setpoint will be increased by the value defined in the
“Setpoint regulation step [0.1 °C]”parameter; if the value “0” is received, the setpoint will be reduced by the
value of “Setpoint regulation step [0.1 °C]”.
The “Setpoint regulation step [0.1 °C]” parameter defines the increase/decrease step of the setpoints
associated with the HVAC modes following the arrival of a command on the relative regulation objects. The
values that can be set are:

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from 1 to 20 in steps of 1 (default value 5)
Regardless of whether the mode setpoints are modified via the local menu or with a remote BUS command, if
the stand alone control type or master/slave is HVAC mode, there is a value setting limit between the setpoints
belonging to the same operating type. This limit is determined as follows:
10°C < Teconomy < Tprecomfort < Tcomfort < 35°C in heating (“T” indicates the general value of the mode
setpoint)
10°C < Tcomfort < Tprecomfort < Teconomy < 35°C in cooling (“T” indicates the general value of the mode
setpoint)
Furthermore, if the dead zone is active, the following constraint must also be respected:
Tcomfort heating < Tcomfort cooling - 1°C (“T” indicates the general value of the mode setpoint)
These constraints must also be respected when the setpoint value received via the BUS lies outside the range
defined by the above formula, bringing the setpoint close to the limit value.
If the stand alone or master/slave control type is setpoint, there is a value setting limit that must be respected
by the various setpoints belonging to the same operating type. It is determined as follows:
10°C < Tfunzionamento < 35°C in both heating and cooling (“T” indicates the general value of the setpoint)
Furthermore, if the dead zone is active, the following constraint must also be respected:
Tfunzionamento heating < Tfunzionamento cooling - 1°C (“T” indicates the general value of the setpoint)
These constraints must also be respected when the setpoint value received via the BUS lies outside the range
defined by the above formula, bringing the setpoint close to the limit value.
The “Change the functioning setpoint via bus through” parameter is used to select the format of the
communication objects via which the operating setpoint is modified when the control type is setpoint. The values
that can be set are:
-absolute value setting [°C] (default value)
-absolute value setting (K)
-absolute value setting [°F]
-increase/decrease step regulation
Selecting absolute valute setting visualises the communication objects Setpoint input (Data Point Type: 9.001
DPT_Value_Temp se °C, 9.002 DPT_Value_Tempd se K e 9.027 DPT_Value_Temp_F if °F), with which the
device operating setpoint can be defined via the BUS.
Selecting increase/decrease step regulation visualises the “Setpoint regulation step [0.1 °C]”parameter
and the communication objects Setpoint regulation (Data Point Type: 1.007 DPT_Step) with which the device
operating setpoint can be regulated. Every time the value “1” is received, the operating setpoint will be increased
by the value defined in the “Setpoint regulation step [0.1 °C]”parameter; if the value “0” is received, the
setpoint will be reduced by the value of “Setpoint regulation step [0.1 °C]”.
The “Setpoint regulation step [0.1 °C]” parameter defines the increase/decrease step of the operating setpoint
following the arrival of a command on the relative regulation objects. The values that can be set are:
from 1 to 20 in steps of 1 (default value 5)
Apart from the local push-buttons, the current setpoint can also be temporarily forced via the BUS (regardless
of whether the control type is HVAC mode or setpoint) via a specific communication objects. The “Temporary
setpoint forcing via bus”parameter is used to enable the oject via which the device receives the temporary
setpoint regulation commands. The values that can be set are:

20
disable (default value)
enable increase/decrease step regulation
Selecting enable increase/decrease step regulation visualises the communication objects Setpoint
temporary forcing regulation (Data Point Type: 1.007 DPT_Step).
If the value “1” is received on this object, the current setpoint will be temporarily increased by the value defined
in the “Setpoint temporary forcing regulation step [0.1 °C]”parameter.
If the value “0” is received on this object, the current setpoint will be temporarily reduced by the value defined in
the “Setpoint temporary forcing regulation step [0.1 °C]”parameter.
The “Setpoint temporary forcing regulation step [0.1 °C]” parameter defines the increase/decrease step of
the current setpoint following the arrival of a command on the relative regulation object. The values that can be
set are:
from 1 to 20 in steps of 1 (default value 5)
The “Reset temporary setpoint forcing via bus”parameter enables the object via which the device receives
the command to eliminate the temporary forcing of the setpoint or the fan speed (in fan coil operation). The
values that can be set are:
disable (default value)
enable
Selecting enable visualises the communication objects Setpoint temporary forcing reset (Data Point Type:
1.002 DPT_Bool).
If the value “1” or “True” is received on this object, the manual forcing will be eliminated and the current setpoint
will be returned to the ETS configuration value. In the case of fan coil operation, AUTO mode will be restored to
manage the fan speed if a fixed speed has been manually set (forcing the operation mode to MANUAL).
The “Set functioning type” parameter is used to enable a specific communication objects for remote
parameters setting (the same priority as for local modification). The values that can be set are:
disable
enable (default value)
If enable is selected, the object Functioning type input (Data Point Type: 1.100 DPT_Heat/Cool) is visualised
for the remote modification of the functioning type and, if the functioning type is automatically modified (dead
zone), the object Enable dead zone (Data Point Type: 1.003 DPT_Enable) is visualised to enable or disable
the dead zone. When the dead zone is disabled via a BUS command on the object Enable dead zone, the
active functioning type remains the one set automatically; it can be modified via the local menu or with a BUS
command on the object Functioning type input.
If the device operation is slave, it is not possible to modify the HVAC mode locally (if the slave control type is
HVAC mode) or modify the operating setpoint above a certain limit (if the slave control type is setpoint). There
are some applications, such as the hotel one, where the thermostat is required to act as a slave and the client
can only change the operating setpoint slightly or switch the device off completely. Device switch-off requires
the setting of HVAC OFF mode (if the slave control type is HVAC mode), or the definition of the setpoint for
BUILDING PROTECTION (if the slave control type is setpoint); this function is activated by pressing the MODE
button key.
The “Allow local switching off”parameter is used to enable this function. The values that can be set are:
disable (default value)
enable
Selecting enable visualises the “Reactivate device by” parameter that defines which condition permits the
deactivation of device switch-off via the local menu. The values that can be set are: