Nexans N-Comfort Kt+ Thermostat Instruction Manual
- June 3, 2024
- Nexans
Table of Contents
Nexans N-Comfort Kt+ Thermostat
USER INTERFACE & INSTALLATION
WIRING INSTRUCTIONS
INSTALLATION AND OPERATING INSTRUCTIONS
N-COMFORT KT+ THERMOSTAT IP65 – SETUP
TECHNICAL SPECIFICATIONS
Bluetooth: Version 4.2
Power supply: 230V – 50Hz
Maximum load: 16A (resistive)
Temperature range: -15°C – +25°C
External Temperature setback: 230V – 50Hz
IP class: IP65
Standard Color: Grey
Dimensions: 105mm x 70mm x 42mm
Sensors: External sensor NTC or wireless sensor
INSTALLATION
Installation must be done by a qualified electrician in accordance with wiring and building regulations. Before installation, disconnect any power to the thermostat’s mains.
Loosen the knob locking screw and pull out the knob. Loosen the 4 screws in the corners and lift the cover part off. Fix the thermostat horizontally on the wall with 2 screws through the holes in corners.
Bring in the cable through three bushings. Larger ones are for mains, setback switch and heater cables and the smaller one for the sensor cable.
Connect the wires to the thermostat’s terminals according to the wiring diagram, see cover page (from left to right).
1: External 230V setback (if in use), 2: Heater neutral Nout, 3: Mains neutral Nin, 4-5: NTC floor probe, 6: Heater live Lout, 7: Mains live Lin.
Close the lid with 4 screws. Turn the potentiometer clockwise to end position and reattach the knob pointing to MAX.
STARTUP
After connecting the power to the thermostat for the first time the parameters are initialized to default values.
Name of thermostat: RANDOM number
Mode: Snow melting
Floor temperature min: 5°C
Floor temperature max: 35°C
Floor temperature offset (calibration): 0°C
Air temperature min: 5°C
Air temperature max: 28°C
Air temperature offset (calibration): 0°C
Snow melting ON temperature min: -15°C
Snow melting ON temperature max: 30°C
Snow melting OFF temperature: -40°C
Snow melting air humidity min: 30%
User program activated eco temp: 19°C
Externally activated eco temp: 5°C
Valve protection: OFF
Sensor type: 10k ohm
Led brightness: 70%
Weekly program: OFF
Use N-Comfort App to check and modify settings
N-COMFORT KT+ THERMOSTAT IP65 – USER MANUAL
BASIC USE
The thermostat is controlled with a rotary knob and an optional external setback switch. The basic use of the thermostat is simple:
- turn off the device by rotating the knob to OFF position
- turn ON and adjust the desired temperature with the knob
- use external 230VAC setback switch to activate the eco temperature (19°C by default)
Led indication lights show the status:
- red ON → comfort temp reached
- red breathing → heating ON
- green ON → eco temp reached
- green breathing → heating ON
- both leds blinking → error
- at power up red led is ON for 4 seconds to indicate floor heating or snow melting mode and in air mode green led is ON for 4 seconds
Additionally with N-Comfort App (see next chapter):
- red blinking → bluetooth connection
- green blinking → confirm to save changes by shortly turning the knob to OFF state
ADVANCED USE
You can access all the thermostat data with a free of charge N-Comfort App running on Android and iOS mobile devices. With the App you read logged temperatures, modify settings and define a weekly user program. App can also generate email reports. Follow the guides in N-Comfort App. Thermostat indicates the mobile device connection with fast blinking red led.
1 Settings
Thermostat has several settings which can easily be adjusted with N-Comfort
App.
Note! Remember to save changes before leaving the setting page.
Name of thermostat
A free and descriptive name shown in N-Comfort App.
Heating mode
Thermostat can measure and adjust floor temperature, air temperature or it can
melt snow and ice from stairs and driveways in snow melting mode. Note! During
eco-hours in snow melting mode the output is turned OFF.
Floor temperature min and max
Min and max values specify active range of knob.
Floor temperature offset (calibration)
If user’s temperature measurement has offset to knob setpoint this setting is
used to calibrate it. Note, floor sensor inside the floor construction is much
warmer than real temperatures measured in room.
Air temperature min and max
In air mode it specifies active knob range.
Air temperature offset (calibration)
If user’s temperature measurement has offset to dial setpoint this setting is
used to calibrate it. Note, Air temperature mode uses external sensor cable.
Snow melting ON temperature min and max
Min and max setting specify the active knob range. When outdoor temperature is
below this setting point the snow melting operation is active.
Snow melting OFF temperature
When it is colder than this temperature the snow melting is switched OFF.
Snow melting air humidity min
When wireless outdoor temperature sensor is used the thermostat also receives
air humidity level. Snow melting function will not be activated if the air
humidity is below this limit.
User program activated eco temp
During all green hours in user program the temperature is adjusted to this
value.
Externally activated eco temp
When 230VAC (pilot signal) is connected to the setback input terminal the
desired temperature is defined by this parameter.
Valve protection
Valve protection turns heating ON once per week for 5 minutes even at summer
time. This setting is typically used with water carrier floor heating valves.
Feature prevents the valve from getting stuck during summer.
Sensor type
Floor sensors from different manufacturers can be used. Supported types are
2k, 10k, 12.5k, 15k, 33k NTCs. Note! In snow melting mode 33k sensor cannot be
used.
Led brightness
Brightness of the Led indicator.
User program mode
AUTO enables the user program, OFF disables it.
Wireless temperature sensor
Adding a wireless BLE temperature sensor allows the best location for
temperature measurement. It is also very accurate. To add a wireless sensor
you have to select it in the N-Comfort App and write the sensor address in
Network key fields.
Receive wireless eco controls
A thermostat with an external setback switch can control several other
thermostats to go in setback mode.
This feature will save the user from hard wiring the Home/Away switch to many
thermostats. Only the thermostats with enabled Receive wireless eco controls
and the same Network key will share the setback info.
Network key and Confirm Network key
Network key is used to identify the wireless temperature sensor or the group
of thermostats to receive the wireless eco controls. Both fields need to have
exactly the same text string and you have to save the settings.
For the wireless sensor you can use the QR code printed on the back side of
the device. Just use the camera function in App (bottom of the screen) to read
the code, then accept and save it.
2 Week schedule (User program)
User can create 24h/7d week schedule in N-Comfort App. With week schedule the
user programs thermostat to decrease temperature during time slots when room
is not used. Comfort/eco state is indicated with red/green led.
Week schedule execution needs correct real time in thermostat. In case of
invalid real time the user program is deactivated and user is warned by
blinking leds. Real time is updated from N-Comfort app every time the
thermostat is connected to a mobile device. Thermostat real time clock has
backup for up to 2 hour power breaks.
3 Error modes
Thermostat indicates an erratic state by blinking the leds. The most typical
case is that real time is corrupted during too long power break. This is
automatically solved by making a connection with N-Comfort app.
Possible error codes (visible on info page of the App) are:
1 Floor sensor fault
2 Over heating
3 Internal fault
10 Real time is not valid
You may try to reset the fault by switching off the power to soft reset or by using N-Comfort app to generate a hard reset.
In errors 1, 2, 3 heating is permanently off. In error 10 user program is deactivated.
The new Nexans N-COMFORT APP is available to Download from
For more information visit our website:
www.nexans.no
www.axjokabel.se