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 sn ‍efficiently manages snow melting systems, ensuring safe movement for people and vehicles during winter without the need for snow removal equipment or salt.

‍The temperature is monitored at the location of the temperature sensor. Based on the sensor's data, the thermostat activates heating when the air temperature falls within the specified range.

Technical data

Technical data

Rated load current (for category AC-1)
32 А (max 40 A for 10 min)
The limits of regulation
upper: 0...10 °С
lower: –20...–1 °С
Measured temperature range:
–30...+85 °С
Rated power load (for category AC-1)
7 000 VА
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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
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)
53 × 85 × 66 mm
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Installation

Installation

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

‍If thermostat is installed in a humid room, it should be placed in enclosure with a protection degree not lower than IP55 in accordance with GOST 14254. 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.

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The thermostat is mounted and connected after the installation and load testing. In order to protect from short circuits and excess power events appearance in the load circuit, it is necessary to install an automatic circuit breaker (CB), which should 
be installed in the live wire break, as shown on Wiring 1.

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.

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.

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 (Wiring 2).

Air temperature sensor installation
Air temperature sensor should be mounted on the wall 
or under the edge of the roof in order to ensure its protection from direct sunlight, rain and snow, and ensure the opportunity for easy replacement in the event of a malfunction or damage (Figure 1). If necessary, it is allowed to shorten and expand sensor connecting wires (separate cable not more than 20 m long with a cross-section greater than 0,75 mm²). Power wires should not be placed near connection wire of sensor otherwise they may cause interference.

Figure 1. Air temperature sensor installation
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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)
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Exploitation

Exploitation

Setting temperature limits
(factory setting upper limit 5 °С, lower –15 °С)
To view the upper temperature threshold, press the "+" or "–" to view lower temperature threshold. Flashing value can be changed by means of "+" or "–" buttons. If sensor temperature is within the specified limits, the heater will turn on and the red indicator will switch on.
Switching on thermostat
To turn on the  thermostat, apply voltage to terminals 3 and 4. The display will show "888" for 3 sec. Then the sensor temperature 
will be displayed. To turn off the thermostat, switch off the circuit breaker.

Settings using buttons

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 seconds, the display will revert to showing the temperature.
Manual heating activation
Time counter load operation
Correction
Hysteresis

Sensor type

Settings via holding the "" or "–" buttons

Switching on / off the load
Reset to Factory Settings
Firmware version

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
Load does not work according to settings, 
every 5 sec screen displays "OS" or "SC"

Additional information

Additional information

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Version of instruction n8231_2411
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