Gewiss Chorus GW 10 795 Owner's manual

GW 10 795 GW 12 795 GW 14 795
Termostato KNX - da incasso
KNX the mostat - flush-mounting
Thermostat KNX - à encastrer
Te mostato KNX - de empot a
KNX-Thermostat - für den Unterputz
MANUA E DI PROGRAMMAZIONE
PROGRAMMING MANUAL - MANUEL DE PROGRAMMAT ON
MANUAL DE PROGRAMACIÓN - PROGRAMM ERHANDBUCH

CONTENTS
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page
GENERA DESCRIPTION
Briefly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Position of the commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Description of the commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Control modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
USER INSTRUCTIONS
Thermostat operation statuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Normal operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Parameter setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Pre-set parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
F.A.Q. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

This manual explains the steps for setting the thermostat parameters. All the information
concerning the technical data of the product, the connection diagrams, the descriptions
of the commands, and the instructions for correct assembly are contained in the
installation manual supplied with the product and which can also be downloaded from
the website www.gewiss.com.
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Briefly
GENERAL DESCRIPTION

GENERAL DESCRIPTION
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The thermostat is equipped with a backlit LCD display and four command push-buttons
that can always be accessed.
910
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Position of the commands

GENERAL DESCRIPTION
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COMMAND PUSH-BUTTONS Symbol
Select operating mode / Confirm
Adjust temperature (+) / Visualise pages
Adjust temperature (-) / Visualise pages
Setting the parameters
INFORMATION ON THE DISP AY
Clock / KNX temperature adjustment probe visualised
Settings menu / Set the values to send to the KNX temperature adjustment probe
Heating activation 1° stage (flame) or 2° stage (flame+asterisk)
Air-conditioning activation 1° stage (snowflake) or 2° stage (snowflake+asterisk)
Type of operation: heating
Type of operation: air-conditioning
Enable remote commands
Fan coil operating mode
- speed OFF
- speed 1 (automatic / manual)
- speed 2 (automatic / manual)
- speed 3 (automatic / manual)
Thermostat in Slave operation
Measured temperature / Temperature measured by KNX temperature adjust-
ment probe / Setpoint on KNX temperature adjustment probe input
Temperature measurement unit
ndication of auxiliary input status ( = contact closed, O = contact open)
Thermal residual current device
Visualisation of temperature measured by KNX temperature adjustment probe
Thermostat mode
- Economy (in heating mode) - Comfort (in air-conditioning mode)
- Pre-comfort (in heating mode and air-conditioning mode)
- Comfort (in heating mode) - Economy (in air-conditioning mode)
- Anti-freeze / High temperature protection
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Description of the commands

GENERAL DESCRIPTION
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The thermostat can be set with 2 different control modes:
•Slave: the functioning depends on the device configured as the Master (e.g. the
GW1x794 KNX flush-mounting timed thermostat), that sets the type, operating mode
or set-point of the thermostat on the basis of the ETS parameterisation. n the first
case (modes), the thermostat uses the set-points configured via ETS. These can be
modified locally and via the BUS if these options are enabled in the ETS configuration.
The fixed temperature set-point can be temporarily forced, but the operating mode
cannot be altered. The forced set-point will remain valid until the master device sends
a new operating mode. n the second case (set-points), the thermostat uses the set-
point received from the master device (but which can always be altered locally).
•Autonomous: the thermostat type and operating mode can be set locally. Operation
is not dependent on any other device. n the autonomous control mode, you can alter
the set-point as you wish, and enable the thermostat to receive remote mode-setting
commands (OFF/Economy/Pre-comfort/Comfort) and type-setting commands
(Heating/Conditioning). Such commands may be sent from other devices such as a
push-button or the KNX GSM remote control.
The thermostat has 4 different operating modes:
• ECONOMY
• PRE-COMFORT
• COMFORT
• OFF - ANT FREEZE/H GH TEMPERATURE PROTECT ON
n the autonomous control mode, to switch from one HVAC mode (economy, pre-comfort,
comfort, off) to another, use the key: each time it is pressed, the corresponding set-
point is shown (flashing) for a moment.
n the slave control mode, no local modification of the HVAC mode is allowed; only the
manual switch-off (if enabled) of the device is possible (HVAC OFF).
n the economy, pre-comfort and comfort operating
modes, the thermostat always uses the corresponding
temperature set-points.
The display shows the detected room temperature and the
, or symbol.
Control modes
Operating modes

GENERAL DESCRIPTION
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MEAN NG OF
The anti-freeze function is only active in heating mode,
when the temperature adjustment system is switched OFF.
n this case, the thermostat uses the fixed anti-freeze
temperature set-point, only reactivating the heating system
if the room temperature falls below TANT -FREEZE.
The display shows the word OFF, along with the detected
room temperature.
The high temperature protection function is only active
in conditioning mode, when the temperature adjustment
system is switched OFF.
n this case, the thermostat uses the fixed high temperature
protection set-point, only reactivating the conditioning
system if the room temperature exceeds TH GH TEMPERATURE
PROTECT ON.
The display shows the word OFF, along with the detected
room temperature.
n the Slave control mode, the display shows the
temperature and the symbol. The thermostat uses the
operating mode or the set-point value received from the
master device via the BUS.
Symbol
Heating Air-conditioning
Set-point Ope ating
modes Set-point Ope ating modes
TECONOMY Economy TCOMFORT Comfort
TPRE-COMFORT Pre-comfort TPRE-COMFORT Pre-comfort
TCOMFORT Comfort TECONOMY Economy

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During operation, the activation of heating or conditioning mode is indicated in the
following way:
Heating
The symbol indicates that the activation command has
been sent to the command actuator of the boiler or area
solenoid valve (1° stage of the heating system(1)). f the load
notifications have been activated via ETS, and the thermostat
does not receive confirmation of effective implementation
from the actuator, the symbol will begin to flash.
Subsequently, the thermostat sends the activation command
every 60 seconds until it receives confirmation. The
symbol indicates that the 2° stage of the heating system(1)
has been activated.
Air-conditioning
The symbol indicates that the activation command has
been sent to the command actuator of the air-conditioner or
area solenoid valve (1° stage of the air-conditioning
system(1)). f the load notifications have been activated via
ETS, and the thermostat does not receive confirmation of
effective implementation from the actuator, the symbol
will begin to flash. Subsequently, the thermostat sends the
activation command every 60 seconds until it receives
confirmation. The symbol indicates that the 2° stage of
the air-conditioning system(1) has been activated.
Operation with active fan coil control
f the fan coil control function has been activated in the
setting of the parameters via ETS, the display will show the
symbol.
n addition, you will be offered the page on which you can
manually alter the fan coil speed or set the AUTO mode
(whereby the fan coil speed is automatically adjusted on the
basis of the difference between the set-point fixed on the
device and the detected temperature).
(1) Some temperature adjustment systems (e.g. floor-mounting ones) have a very high thermal inertia level, so
it takes considerable time to bring the room temperature into line with the required set-point; in order to reduce
this inertia, another system with less inertia is often installed to help the main system to heat/cool the room
when the difference between the set-point and the detected temperature is particularly marked. This system,
known as 2° stage, helps to heat/cool the room during the initial phase, then it stops working when the
difference between the set-point and the temperature can be managed in a faster way.

USER INSTRUCTIONS
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Thermostat operation statuses
The thermostat has two distinct operation statuses:
- Normal operation
- Parameter setting
When it is switched on, the thermostat goes into "normal operation" status. Using the
button key, you can switch from one status to the other (the switchover from "parameter
setting" status to "normal operation" status also comes about automatically, 30 seconds
after the last pressure on the button keys).
Normal operation
n normal operation conditions, the pages containing information about the thermostat
are shown, along with the pages relating to any remote elements (e.g. KNX temperature
adjustment probes) that may be present.
Choosing the page you want to see
To access the screen listing the pages that can be viewed
(relating to the thermostat and remote elements), keep the
button key pressed.
P04Use the or button key to scroll through the
sequence (if there are no remote elements, called P01, P02,
P03, etc., the main thermostat page will be shown). To
confirm a page, press the button key or wait for the 30-
second time-out period to elapse.
Pages relating to the thermostat (control type: HVAC)
Choosing the HVAC mode (pre-comfort, comfort,
economy or OFF)
f the visible page relates to the thermostat, and the control
type has been set by ETS in HVAC mode, press the button
key to select the required HVAC mode ( , ,
or ).
Each time the key is pressed, the set-point of the selected
HVAC mode is shown for a moment.
f the device is configured as a Slave, no local modification
of the HVAC mode is allowed; manual HVAC switch-off (OFF)
is permitted if this function is enabled via ETS.

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Forcing the set-point manually
f the visible page relates to the thermostat and any HVAC
mode other than OFF is active, press the or button key
to temporarily modify the set-point of the active HVAC mode
(within the adjustment limits set via ETS), then confirm with
the button key or wait for the 5-second time-out period to
elapse. The use of forcing is indicated by the flashing of the
, , symbols. t remains active until the active HVAC mode
is modified
Pages relating to the thermostat (control type: set-point)
Forcing the set-point manually
f the visible page relates to the thermostat, and the control
type has been set by ETS in set-point mode, press the or
button key to temporarily force the set-point itself (within
the adjustment limits set via ETS).
The forcing remains active until the operating set-point is
modified, or until the thermostat is manually switched off.
Manual switch-off
f the visible page relates to the thermostat, and the control
type has been set by ETS in set-point mode, press the
button key to switch the device off manually ( ).
Press the button key again to reactivate the device; when
the button key is pressed, the active set-point will be shown
for a few moments. This operation is only possible if the
function is enabled via ETS.
Pages relating to the thermostat (control type: HVAC or set-point)
Choosing the fan coil speed
f the visible page relates to the thermostat, and set-point
control or any HVAC mode other than OFF is active, press
or simultaneously to access the selection page (the
control algorithm of the heating/conditioning function must
be set on "fan coil" from the ETS).
Use the or button key to select the required fan coil
setting ( ,, or ), then confirm with the button
key or wait for the 30-second time-out period to elapse.

USER INSTRUCTIONS
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Parameter setting
To set the operating parameters of the thermostat and any remote elements (e.g. KNX
temperature adjustment probes), press the button key.
To quit the parameter setting procedure without saving the modifications made on the
current page, just press the button key again or wait 30 seconds from the last pressure
on the button keys. The parameters that can be modified will depend on the page you
are viewing in normal operation status: if the visible page relates to the thermostat, the
Set menu concerning the thermostat will be shown; if the visible page is that of a general
remote element, the Set menu concerning the selected element will be shown.
The parameters relating to the thermostat are collected into three functional groups:
general parameters, operating parameters, and control parameters. Each group can be
enabled or disabled for visualisation and/or local modification, by setting the ETS
parameter "Local parameter modification" of the "General" menu.
General parameters
Setting the hour
When the hour figures are flashing, set the hour using the
button keys.
To confirm the set value and move on to the next parameter,
press the button key within 30 seconds.
Setting the minutes
When the minute figures are flashing, set the minutes using
the button keys.
To confirm the set value and move on to the next parameter,
press the button key within 30 seconds.
Pages relating to the remote elements
Viewing the remote elements
f the visible page relates to a remote element, press the
button key to alternate the visualisation of the detected
temperature and the set-point; if one of these two figures is
not available, nothing will happen when the button key is
pressed.
To return to the screen listing the pages that can be viewed, keep the button key
pressed. Use the or button key to scroll through the sequence. To confirm a page,
press the button key or wait for the 30-second time-out period to elapse.

Setting GMT / daylight-saving time
Use the or button key to choose either GMT or daylight-saving
time (OFF = GMT; ON = daylight-saving time). This screen is only
visible if the parameter has been enabled from ETS. To confirm
your choice and move on to the next parameter, press the button
key within 30 seconds.
Setting the temperature measurement unit
When the °C or °F temperature symbol begins flashing, select
the temperature measurement unit by means of the
button keys. To confirm your choice and move on to the next
parameter, press the button key within 30 seconds.
Returning to the main page
Use the or button key to set the main page that the device
must automatically visualise at the end of a period of inactivity
by the user (OFF = function disabled; THER = main thermostat
page; P01, P02, P03, P04 = pages relating to the remote
elements, if these are enabled).
f this function is enabled, press the button key to access the
page for setting the duration of the inactivity period. Use the
or button key to set the gap (5 - 120 seconds). To confirm
your choice and move on to the next parameter, press the
button key within 30 seconds.
Back-lighting colour
Use the or button key to modify the colour of the display
back-lighting. To confirm your choice and move on to the next
parameter, press the button key within 30 seconds.
Icons theme
Use the or button key to modify the colour themes for
representing the various icons shown on the display (MONO =
single-colour theme; TH1, TH2, TH3, TH4, TH5 = colour themes)
when the back-lighting is active. The screen is only visible if the
back-lighting colour is white. To confirm your choice and move on
to the next parameter, press the button key within 30 seconds.
Single-colour theme for icon colour
Use the or button key to modify the colour of the icons
within a single-colour theme. This parameter is only visible if
the icon theme is single-colour and the back-lighting is active.
To confirm your choice and move on to the next parameter,
press the button key within 30 seconds.
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USER INSTRUCTIONS
Back-lighting timing
Use the or button key to set the minimum duration of
the inactivity time of the user before the back-lighting is
automatically deactivated (the gap can be set from 10 to
180 seconds). This parameter is only visible if the back-
lighting is active. To confirm your choice and move on to
the next parameter, press the button key within 30
seconds.
Back-lighting intensity
Use the or button key to choose how to manage the
back-lighting intensity (MAN = fixed value; SENS = light
sensitive sensor). This parameter is only visible if the back-
lighting is active. f the type of management is MAN, use
the or button key to choose the required percentage
of light intensity (the gap can be set from 30 to 100%).
f the type of management is SENS, use the or button
key to increase (+10%), decrease (-10%) or leave unaltered
(0%) the intensity value detected by the built-in light
sensitive sensor.
To confirm your choice and move on to the next parameter,
press the button key within 30 seconds.
f the local modification function has been enabled from the ETS menu for the General
Parameters group only, press the button key to return to the start of the parameter
configuration menu. Otherwise, continue with the configuration of the next group of
parameters.
Operating parameters
Selecting Heating or Air conditioning
Use the or button key to select the operating type
( = heating; = air-conditioning; = auto). The auto
function is visible if the interdiction area(1) has been enabled via
the relative ETS parameter, or if the device is operating as a Slave.
To confirm your choice and move on to the next parameter, press
the button key within 30 seconds.
(1) The operating mode of the device (heating or air-conditioning) can be managed manually or autonomously
(by the device itself). The manual method is via the local navigation menu or BUS commands that allow you to
switch from one type to another, modifying the specific parameter. The automatic method is based on the
principle of an interdiction area - i.e. the temperature gap between the set-points of the HVAC heating and air-
conditioning modes, allowing the automatic switchover from one type of operation to the other.

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USER INSTRUCTIONS
If the operating type is "heating":
Setting the set-point (heating)
When the symbol appears, the temperature value
begins flashing. Adjust the value of (TECONOMY) with
the aid of the button keys.
To confirm the set value, press the button key within 30
seconds.
Setting the set-point (heating)
When the symbol appears, the temperature value
begins flashing. Adjust the value of (TPRE-COMFORT)
with the aid of the button keys. To confirm the set
value, press the button key within 30 seconds.
Setting the set-point (heating)
When the symbol appears, the temperature value
begins flashing. Adjust the value of (TCOMFORT) with
the aid of the button keys.
To confirm the set value, press the button key within 30
seconds.
Setting the anti-freeze temperature value
When the symbol appears, the temperature value
begins flashing. Adjust the value of the anti-freeze
temperature using the button keys.
To confirm the set value, press the button key within 30
seconds.
The figure shows that as long as the detected temperature
is below the heating set-point, the operating mode is
"heating"; if the detected value is higher than the air-
conditioning set-point, then the operating mode is
"air-conditioning". f the detected value is within the
interdiction area, the operating mode remains as before.
The heating -> air-conditioning switchover point
corresponds to the set-point of the HVAC mode relating to
air-conditioning; the air-conditioning -> heating switchover
point corresponds to the set-point of the HVAC mode
relating to heating.
Air-conditioning
nterdiction area
Heating

If the operating type is "air-conditioning":
Setting the set-point (air-conditioning)
When the symbol appears, the temperature value
begins flashing. Adjust the value of (TCOMFORT) with
the aid of the button keys. To confirm the set value,
press the button key within 30 seconds.
Setting the set-point (air-conditioning)
When the symbol appears, the temperature value
begins flashing. Adjust the value of (TPRE-COMFORT)
with the aid of the button keys. To confirm the set
value, press the button key within 30 seconds.
Setting the set-point (air-conditioning)
When the symbol appears, the temperature value
begins flashing. Adjust the value of (TECONOMY) with
the aid of the button keys. To confirm the set value,
press the button key within 30 seconds.
Setting the high temperature protection value
When the symbol appears, the temperature value
begins flashing. Adjust the value of the high temperature
protection using the button keys.
To confirm the set value, press the button key within 30
seconds.
f the operating type is "auto", the set-point setting pages visualised are those relating
to the operating type active in that moment (heating or air-conditioning).
ATTENTION!
The set-point values are subject to the following limitations:
- HEAT NG
TANT -FREEZE ≤ ≤ ≤
- A R-COND T ON NG
≤ ≤ ≤ TH GH TEMPERATURE PROTECT ON
f the local modification function has been enabled from the ETS menu for the General
Parameters and Operating Parameters groups only, press the button key to return to
the start of the parameter configuration menu. Otherwise, continue with the configuration
of the next group of parameters.
USER INSTRUCTIONS
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Control parameters
The screens that can be visualised will depend on the type of control logic of the
temperature adjustment system that was set via ETS (with the “Heating control
algorithm” and the “Air-conditioning control algorithm” parameters of the “Load control”
menu):
• two points ON-OFF
• two points 0%-100%
• PWM proportional-integral
• continuous proportional-integral
• fan coil with ON-OFF speed control
• fan coil with continuous speed control
TWO POINTS ON-OFF
The operating principle manages the temperature adjustment system with two thresholds
(hysteresis cycle), used to distinguish the ON or OFF status of the system.
n heating mode, when the detected temperature is lower than the “set-point - heat” value, the
device activates the heating system by sending the relative command to the actuator that manages
it; when the detected temperature reaches the fixed set-point value, the device deactivates the
heating system.
HEAT NG
n air-conditioning mode, when the detected temperature is higher than the “set-point + cond”
value, the device activates the air-conditioning system by sending the relative command to the
actuator that manages it; when the detected temperature reaches the fixed set-point value, the
device deactivates the air-conditioning system.
AR-COND T ON NG
To avoid the continuous switchovers of the solenoid valve, after an OFF-ON-OFF sequence, the next
ON command can only be sent after at least 2 minutes have elapsed.
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T
set-point
set-point
heat
cond

TWO POINTS 0%-100%
The operating principle is similar to that of the two points ON-OFF, but with the difference
that the communication objects for temperature adjustment management are of 1 byte.
n heating mode, when the detected temperature is lower than the “set-point - heat ”
value, the device activates the heating system by sending the relative percentage command to
the actuator that manages it; when the detected temperature reaches the fixed set-point value, the
device deactivates the heating system.
HEAT NG
n air-conditioning mode, when the detected temperature is higher than the “set-point + cond”
value, the device activates the air-conditioning system by sending the relative percentage
command to the actuator that manages it; when the detected temperature reaches the fixed set-
point value, the device deactivates the air-conditioning system.
AR-COND T ON NG
To avoid the continuous switchovers of the solenoid valve, after a 0%-100%-0%
sequence, the next 100% command can only be sent after at least 2 minutes have
elapsed.
Setting the adjustment differential
Use the button keys to set the value of the adjustment
differential of the two-point control algorithm (the gap can
be set from 0,1°C to 2,0°C).
To confirm your choice and move on to the next parameter,
press the button key within 30 seconds.
USER INSTRUCTIONS
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T
set-point
heat
T
set-point
cond

PWM PROPORTIONA -INTEGRA
The PWM control algorithm, used to control the temperature adjustment system, allows
you to drastically reduce the times subject to thermal inertia and introduced by the two-
point control. This type of control involves the modulation of the impulse duty-cycle,
represented by the temperature adjustment system activation time, on the basis of the
difference between the fixed set-point and the temperature effectively detected. Two
components are needed to calculate the output function: the proportional component
and the integral component, used to improve the response in order to reach the
temperature at the fixed set-point. Once the proportional band has been defined (from
set-point to set-point - for heating mode, from set-point to set-point + for air-
conditioning mode), its width determines the extent of the system's response: if it is too
narrow, the system will be more reactive but with swings; if it is too wide, the system
will be slower. The ideal situation is one where the band is as narrow as possible, without
swings. The integration time is the parameter that determines the action of the integral
component. The longer the integration time, the slower the modification of the output and
hence the slower the system response. f the time is too short, the threshold value will
be exceeded, and the function will swing around the set-point.
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cycle time
cycle time
set-point
set-point
AR-COND T ON NG
HEAT NG
set-point
set-point

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The device keeps the temperature adjustment system switched on for a cycle time
percentage that depends on the output function of the proportional-integral control; the
device continually adjusts the system, modulating the system ON-OFF times with a duty-
cycle that depends on the value of the output function (calculated at each time gap equal
to the cycle time). The cycle time is reinitialised every time the reference set-point is
modified.
With this type of algorithm, there is no longer a hysteresis cycle on the heating/cooling
element, so the inertia times introduced by the two-point control are eliminated. This
produces energy savings because the system does not remain switched on when it is not
needed and, once the required temperature has been reached, it continues to provide a
limited contribution to compensate for the environmental heat dispersion.
Setting the proportional band
Use the button keys to set the value of the
proportional band of the proportional-integral control
algorithm (the gap can be set from 1°C to 10°C).
To confirm your choice and move on to the next parameter,
press the button key within 30 seconds.
Setting the integration time
Use the button keys to set the value of the integration
time of the proportional-integral control algorithm (the gap
can be set from 1 to 250 seconds, OFF).
To confirm your choice and move on to the next parameter,
press the button key within 30 seconds.
Setting the cycle time
Use the button keys to set the value of the cycle time
for the proportional-integral control algorithm (the possible
values are: 5, 10, 15, 20, 30, 40, 50, 60 minutes).
To confirm your choice and move on to the next parameter,
press the button key within 30 seconds.
CONTINUOUS PROPORTIONA -INTEGRA
The operating principle is similar to that of the PWM proportional-integral, but with the
difference that the communication objects for temperature adjustment management are of 1
byte.
This type of control involves the continuous control of the difference between the fixed set-
point and the temperature effectively detected.