Manual terneo b

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

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

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

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.

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 (Wiring 2).

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).