Installation
and operation

manual. Print version

терморегулятор terneo sx
In the box: thermostat, temperature sensor with connected wire, installation and operation manual, the packing box

Content

Content

Purpose

Purpose

Thermostat terneo b ‍is designed to maintain a comfortable temperature for underfloor heating systems. The thermostat controls heating based on data from the temperature sensor located in the floor.

‍This thermostat is ideal for use with systems based on heating cables and films. A unique feature of this model is the ability to be installed in an electrical panel and its compatibility with high-power systems up to 7000 VA.

‍It is also possible to use the thermostat to control underfloor heating based on water pipes with a normally open or normally closed thermo-electric servo, operating at a voltage of 230 V. When connecting a normally open servo activate the "Reverse load control" function in the menu.

Technical data

Technical data

Rated load current (for category AC-1)
32 А (max 40 A for 10 min)
Adjustment range
5...40 °С
Temperature hysteresis by floor
1 °С
Measured temperature range
–30...+85 °С
read more
Rated power load (for category AC-1)
7 000 VА
Input voltage
230 V ±10%
Weight in the complete set
0,285 kg ±10%
Temperature sensor (in set)
NTC thermo-resistor10 kOhm at 25 °C (R10)
Length of the sensor connected cable
4 m
Maximum extension length of the temperature sensor
20 m
Supported sensor types:
analog:
NTC 4.7, 6.8, 10, 12, 15, 33, 47 kOhm at 25 °C
digital:
D18
Number combinations under heat, at least
100 000 cycles
Number of combinations 
without heating, no less than
1 000 000 cycles
Power consumption
no more than 1,5 kW*h/m
Overall dimensions (w·h·d)
70 × 85 × 53 mm
close

Installation

Installation

‍Read this document carefully before installing and using the thermostat. This will help to avoid possible hazards, errors, and misunderstandings.

‍The thermostat is designed for indoor installation. Minimize the risk of moisture and liquids entering the installation area. The ambient temperature during installation must be between –5...+45 °C. The installation height of the thermostat should be in the range 0,4...1,7 m above the floor level.

‍The temperature controller should be mounted in a special cabinet, which allows accessible installation and opera­tion. The cabinet must be equipped with a standard 35 mm mounting rail (DIN-rail). The temperature controller has width of three standard 18 mm modules.

read more
To protect against short circuits, install an automatic circuit breaker (CB) with a rating of up to 32 A in the phase wire break before the thermostat.

In order to protect a person from electric shock, a residual current device (RCD) should be installed. The load should be grounded (connected to the protective conductor) for proper operation of the RCD or, if the power supply is two wire, a protective grounding (i.e. load to neutral to the RCD) should be made.

For installation you need:
— fix the temperature controller on the DIN-rail;
— supply power, load and sensor wires;
— make a connection according to this manual.

The terminals of the temperature controller are designed for a wire with a cross section not exceeding 16 mm². It is desirable to use a soft copper wire to reduce the mecha­nical loads on the terminals. The use of aluminum is not desirable. Strip the ends of wires 10 ± 0,5 mm. If the strip­ped end is longer, it may cause a short circuit and, if shorter, can cause an unreliable connection. Use cable lugs. Loosen the terminal screws and insert the stripped end of the wire into the terminal. Tighten the power terminal with moment of 2,4 N·m and sensor terminal — 0,5 N·m. Poor tightening can lead to poor contact and overheating of terminals and wires, and excessive tightening — to damage of terminals and wires. The wires are tightened in the power terminals with a screwdriver with a bit width of not more than 6 mm, and in the terminals for the sensor — of not more than 3 mm. A screwdriver with a bit width of more than 6 mm for power terminals (more than 3 mm for sensor terminals) can cause mechanical damage to the terminals. This may cause to the loss of the warranty.

If necessary the sensor connecting wires may be shortened and extended (for not more than 20 m).

It is necessary for the temperature controller to switch the current to no more than 2/3 of the maximum current specified in the specification. If the current exceeds this value, the load must be connected through a contactor (magnetic actuator, power relay), which is optimized for this current (Diagram 2).

close

Electrical connection diagram

Electrical connection diagram

‍The thermostat supports two types of sensors: analog (R10) and digital (D18). The analog sensor is supplied with the thermostat and is connected to terminals 1 and 2.

‍To connect a digital sensor, connect the blue wire to terminal 2 and the white wire to terminal 1, and be sure to change the Sensor type to d18 in the menu.

‍The supply voltage (230 V ±10%, 50 Hz) is supplied to terminals 3 and 4, and the phase (L) is determined by the indicator and is connected to terminal 4, and a neutral (N) — to the terminal 3.

‍The load wires are connected to terminal 5 and a neutral terminal block (not included in the set).

Diagram 1. 
Connection diagram of 
the thermostat, circuit breaker and RCD
Diagram 2. 
Connection through 
a contactor (magnetic starter)
read more
close

Exploitation

Exploitation

Switching on thermostat

To turn on the thermostat, apply voltage to terminals 3 and 4. Then the sensor temperature will be displayed. To turn off the thermostat, turn off the circuit breaker.

Temperature setting

‍(factory setting 25 °С)

Use "+" and "–" to select the temperature. When the load is applied to the underfloor heating, the red indicator light will turn on.

Sleep Mode

Hold the middle button for 4 sec until "oFF" appears on the screen. For a complete shutdown, the circuit breaker should be turned off.
To exit the sleep mode, also press and hold the middle button for 4 sec until "on" appears on the screen.

Reset to Factory Settings

Hold the "–" button for 12 sec until "dEF" appears on the screen. After releasing the button, the thermostat will restart.

Firmware version

‍Hold the "–" button for 6 seconds, the firmware version will be displayed in a running line. The manufacturer reserves the right to modify the firmware to improve the performance of the thermostat.

Menu button "≡"

Menu button ""

‍Use "≡" to navigate the menu, and "+" or "–" to adjust parameters. The first button press makes the parameter blink, while the second press changes its value. If no buttons are pressed for 5 sec, the display will revert to showing the temperature.

Timer — activation
(factory setting "toF", range of changes: 
"toF" — off, "ton" — on)
Timer — duration
(factory setting "9.0h", adjustable range 0.5–99 hours, step size 0.5 hours)
Correction
(factory setting 0, range ±5,0 °С, step 0,1)
Inverse load control
(factory setting "oFF", 
range "on")
Time counter load operation
Sensor type
(factory setting 10r)

Possible issues and solutions

Possible issues
and solutions

Screen is flashing "oht" |overheat|
The screen displays "Ert" |error temperature|
The load is disabled,  indicator nor the screen light up
The load is working, "t" flashes on the screen

Additional information

Additional information

Technical support chat
If you haven't found the answer, please contact our technical support engineer: Instagram or Telegram
Version of instruction b8231_2411
Click three dots in the top corner of Chrome browser ➔ select "Translate" ➔ click three dots again ➔ "Choose language"