terneo sneg + OSA Smart Control of Heating User Manual

smart control of heating
sneg + OSA
Technical data sheet and
installation and operation manual

sneg + OSA Smart Control of Heating

The terneo sneg + OSA thermostat is designed to organize a snow and ice melting system that ensures the safety of movement for people and vehicles in winter, and allows you not to use salt and snow removal devices.
When the air temperature falls within the specified range, the system starts checking for precipitation on the OSA sensor surface. When moisture is detected, the system is turned on and off when the surface of the precipitation sensor is cleaned and the specified post-heating time passes. Post-heating is necessary to completely remove precipitation from the heated surface.
To melt snow and avoid the formation of ice crust on the surface of the sensitive OSA contacts, internal heating is provided in the sensor. It turns on every hour for 20 minutes and turns off for 40 minutes until moisture is detected.
The presence of precipitation is determined by the moisture resistance on sensitive contacts of the precipitation sensor and is displayed on the screen in relative units. The greater is the amount of moisture between the contacts of the precipitation sensor, the lower is the resistance. If moisture is detected (resistance below 999 units), the internal heating of the precipitation sensor will work constantly. In this case, if the resistance decreases to the set limit of 200 units and lower (adjustable), heating will turn on. As soon as the resistance rises above the set limit of 200 units, the postheating period will start.
IN THE ABSENCE OF A PRECIPITATION SENSOR, heating is turned on when the air temperature falls within the specified range.

IN THE BOX

1  piece
The packing box| 1  piece

Before the installation and operation of the device, PLEASE READ BY THE END OF THIS DOCUMENT. This will help to avoid possible danger, mistakes and misunder standings.

TECHNICAL DATA

Тhermostat terneo sneg

Adjustment range| upper.: 0…10 °С
lower: –20…–1 °С
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Maximum load current| 16 А
Rated load capacity| 3 000 АV
Input voltage| 230 V ± 10 %
Weight in the complete set| 0,145 kg ±10 %
Overall dimensions| 54 × 90 × 66 mm
Temperature sensor| NTC thermo-resistor 10 kOhm at 25 °C (R10)
The length of the sensor connected cable| 4 m
Number combinations under heat, at least| 50 000 cycles
Number of combinations without heating, no less than| 20 000 000 cycles
Degree of protection GOST14254| IР20
Range of measured temperatures| –30…+75 °С

Precipitation sensor OSA

WIRING

Thermo supports two types of sensors: analog (R10) or digital (D18) air temperature sensor.
Analog sensor is connected to terminals 1 and 2. Wires colors are of no importance.
Digital sensor is connected to terminal 1 using white wire and to terminal 2 using blue wire. If «OС» message appears on the air temperature sensor screen, try to connect the opposite. If the thermo stat does not see the sensor at both attempts, contact the Service Center.
The supply voltage (230 V ±10 %, 50 Hz) is applied to terminals 9 (phase, L) and 10 (zero, N).
To control the load, terminals 7 and 8 (relay) are used. The relay used in the thermo stat has a potential-free contact normally open contact, ie the relay contacts do not have a
galvanic connection with the power supply circuits.
The precipitation sensor is connected to terminals 3-6. The green wire (precipitation temperature sensor) is connected to terminal 3, the blue (moisture sensor) to terminal 4, brown (common) to terminal 5 and orange (heater) to terminal 6.
The sensor uses a duplexed system. In the event of a failure in the precipitation sensor, use redundant wires of the appropriate color with a white stripe (see page 14).

DO NOT CONNECT TWO GREEN OR TWO ORANGE wires (main and standby) to terminals 3 and 6 at the same time. This can damage the thermostat or cause it to malfunction.

INSTALLATION

The thermo stat is designed for indoor installation. The ingress risk of moisture or liquid into the place of installation must be minimized.
The ambient temperature during installation must be between –5…+ 45 °C. The installation height of the thermostat should be in the range 0,5…1,7 m above the floor level.
The thermostat is installed in a special box, which allows conducting easy installation and operation. Cabinet should be equipped with standard mounting rail 35 mm width (DIN- rail). The appliance takes in width of three standard modules on 18 mm.
The thermostat is installed and activated after installation and inspection of the voltage.
To protect against short-circuit in the load circuit the circuit breaker (CB) has to be installed before installing the thermostat. The circuit breaker is installed in the gap of phase conductor, as shown in the Wiring 1.
To protect a people against electric shock leakage is installed the SSD (safety shutdown device). For working of SSD the heating cable screen must be grounded (connected to the protective conductor PE) or, if there is two-wire network, it is necessary to make protective neutral earthing. That is to connect the screen to a zero before SSF.
The thermostat terminals are designed for a wire with section not more than 2,5². To reduce the mm mechanical loads on the terminals it is desirable to use a soft wire. The ends of the wires must be cleaned and crimped with ferrules with insulation. The wires are tightened in the terminals using a screwdriver with a blade width no more than 3 mm. The screwdriver with a blade width more than 3 mm can cause mechanical damage to the terminals. This may result in the loss of right for warranty.
To increase the service life of the relay, it is necessary for the thermostat to switch the current not more than 2/3 of the maximum current specified in the passport. Otherwise, use a contactor designed for this current (wiring 2).
The contactor is also used to control the 3-phase load. Wiring 3 shows the possible option of connecting a contactor for controlling a 3-phase load with a 230 V coil, and wiring 4 — with a 400 V coil.
WARRANTY TERMS
The warranty for terneo devices is valid for 36 months from the date of sale, provided that the instructions are followed. The warranty period for products without a warranty certificate is counted from the date of production.
If your device is not working properly, we recommend that you first read the section «Possible problems». If you cannot find an answer, contact Service Center. In most cases, these actions resolve all issues. If you continue to have issues with the device, please send it to a Service Center or to the store where you purchased the device. If your device is defective due to our fault, we will repair or replace it under warranty within 14 business days.
Please see the full text of the warranty and the data you need to send to your Service Center on the website https://www.ds-electronics.com.ua/en/. If you have a warranty case, please, contact the General distributor in your area.

SERVICE CENTER CONTACT:
+38 (091) 481-91-81
WhatsApp Viber Telegram
support@dse.com.ua

WARRANTY CARD

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Air temperature sensor installation
The air temperature sensor is installed on the wall or under the roof edge so that it is not exposed to sunshine, rain and snow, and there is the possibility of unobstructed replacement in case of malfunction or damage (Fig. 1). If necessary, it is allowed to shorten and increase the sensor connecting wires (separate cable not more than 40 m with a cross section of more than 0,75 mm ). The power wires should not be located near the sensor connection wire — they can cause interference.
Installation of the precipitation sensor
The surface of the sensor must always be placed horizontally during installation, the contacts for determining the precipitation (sensor) must be directed upwards. If necessary, the sensor cable can be extended. For example, using an intermediate junction box or simple elongation with sealing connections, for example, shrink tubing.
The sensor cable is pulled through the mounting tube to the installation site of the thermostat. Do not install the sensor cable close to power cables, they may interfere. When choosing the location for installation of the precipitation sensor in the heated surface of the soil, use these criteria:
— the greatest shadow during the day;
— the greatest amount of precipitation (where snow appears first of all and wind sweeps snowdrifts).
Rules for mounting the sensor:
— place the sensor in a concrete base, on the same level as the heated surface (Figure 2). The base under the sensor mounting location must be firm. This is to ensure that the sensor is not forced into the ground under heavy load from above; the precipitation sensor should be located
— inside the heated surface and at least 1 m from its edge (Figure 3);
— sensitive sensor element should be located at the top.
In the case of asphalt pavement, the mounting pipe must be metal (it allows to withstand high temperatures). When laying asphalt, do not expose the sensor and cable to high
temperatures. Use a wooden or similar plug instead of the sensor until it cools down completely.
Take care of sealing the sensor’s side joint with a coating for reliable drainage of the melting water onto the sensor surface. Otherwise, it will flow past and soak into the soil.
AVOID CLOGGING THE SENSOR SURFACE
with leaves, gravel and other things that can distort the data of precipitation.

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EXPLOITATION

Use the middle button «≡» to navigate through the menu. Use the «+» and «–» buttons to change the parameters. After pressing the button for the first time the parameter will flash, after pressing it for the second time the parameter will change. In 3 sec after the button was pressed the indicator will return to displaying the system voltage.
Switching on / switching off
To turn on, apply the voltage to terminals 9, 10. Within 3 seconds «888» will be displayed on the screen.
Then the temperature of the air and precipitation sensors will be indicated. The work of the load (of the heating system) will be signaled by a red indicator light.

| In the absence of moisture on the surface of the precipitation sensor (resistance at the sensor terminals above 999 units), the thermoregulator will output «drY» — dry.
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Selection of temperature range
(factory settings upper limit 5 °С, lower – 10 °С )

| To view the upper temperature limit, press briefly «+» , the lower limit — «–» . The flashing limit value can be changed with the buttons «+» «–» or.
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| 3 seconds after the last pressing of the buttons or short pressing of the button «≡», the thermostat switches to the normal operation mode.

Manual activation of heating (factory settings 3 h)
Press the middle button once to force the heating ON / OFF as well as to reset the post-heating operation.

| After activation, the middle screen will display the remaining time before the heating is completed. Using the
«+» and «–» buttons,you can change the heating time in the range of 0,5 – 9 hours, with 0,5 hour increments.
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Start of precipitation control depending on the t entrance to the limits

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Table 1. FUNCTION MENU

16](https://manuals.plus/wp-content/uploads/2022/12/terneo-sneg-OSA-Smart- Control-of-Heating-FIGURE-16.jpg)| After the precipitation sensor detects the absence of moisture on its surface,the heating will continue for a period of post-heating to completely remove the precipitation.
Air sensor temperature correction — correction
(factory setting , 0 range ±5 °С, step 0,1 °С)| Press 1 time| | If you need to make a correction to the air
sensor readings on the thermo screen.
Resistance humidity (factory setting 200 units, range 10–990, step 10)| Press 2 times| | Determined by the level of resistance, which
is formed on the precipitation sensor surface.
Moisture timeout — time h  umidity ( actory setting 36 h, 1–240,  range step 1)| Press 3 times| | This is the maximum time at which
the thermostat attempts to drain the surface
of the precipitation sensor.
Hysteresis (factory setting  1, range 0,1…10 °С, step — 0,1 °С) Moisture check on the precipitation sensor is made in the given temperature range zone with respect to hysteresis.| Press 4 timas| | This is the difference between the temperature
of load switch on/off. Less value of hysteresis
allows you to more accurately keep the temperature, more — save on energy consumption and increase relay service life
due to reduction of the number of load switches (see Fig. 5-6).
Reset to factory settings| Hold 30 sec| | After releasing the buttons, the thermostat
will reset all settings to the factory settings.

Service Information

Total load running time in hours
view only| Hold 6 sec| | Service information. The example shows
8 hours 30 minutes of load operation.
View firmware version| Hold 12 sec| | The manufacturer keeps the right to modify
the firmware to improve characteristics of the thermostat.
Load relay switch counter| Hold 15 sec| |
Thermostat switch counter| Hold 18 seс| |

POSSIBLE PROBLEMS, CAUSES AND WAYS TO OVERCOME THEM
At turning on neither indicator nor screen do not shine
Possible cause: there is no power supply voltage.
It is necessary to: ensure supply voltage presence. If there is voltage, then please contact the Service Center.
The load does not work according to the settings, the upper screen displays «ouh»

| The temperature inside the housing exceeded 80 °C, the protection from internal overheat worked.
Possible cause: internal overheating of the thermostat, which can lead to: poor contact in the terminals of the thermostat, high ambient temperature, exceeding the power of the switched load, or the cross section of the wires for connection is incorrectly selected.
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It is necessary to: check the tightening of power wires in the terminals of the thermostat, make sure that the power of the switched load does not exceed the permissible one, the cross section of the wires for connection is selected correctly.
Features of the protection against internal overheating: when the temperature inside the housing drops below 6 °C, the thermostat will resume operation. When the protection is triggered more than 5 times in a row, the thermostat is blocked until the temperature inside the housing drops below 65 °C and one of the buttons is pressed 5.
The upper screen displays «Ert» every 5 seconds

| Possible cause: a break or short circuit of the internal overheating sensor. Internal overheatingis not monitored.
It is necessary to: send the thermostat to the service center. Otherwise, overheating control will not be carried out.
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Load does not work according to settings, the upper screen displays «OC» or «SC»

| open circut — air sensor circuit break
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| short circut — short circuit of the air sensor circuit

Possible cause: incorrect connection, damage of the temperature sensor circuit, or temperature is beyond the measured limits (see Techn. data).
It is necessary to: check the correct connection, the temperature sensor circuit, the absence of damage to the sensor connecting wire, the absence of closely passing power wires. Make sure that the temperature does not exceed the measured limits. If the problem persists, contact the Service Center.
Operation of the thermostat in case of damage to the air temperature sensor. The load is turned on in the presence of moisture and the temperature of the precipitation sensor within limits: upper 3… 10 °С, lower – – 20… 1 °С. The lower temperature limit is controlled when the heating of the precipitation sensor is off. Internal heating in the precipitation sensor is turned on every hour for 20 minutes and is turned off for 40 minutes until moisture is detected.
Precipitation is not determined, the middle screen displays «OC» or «SC», heating of the precipitation sensor does not work

| open circut — drop of precipitation sensor circuit
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| short circut — short circuit of precipitation sensor circuit

Possible cause: improper connection, damage to the precipitation sensor circuit or contamination.
It is necessary to: check the correctness of connection, the circuit of the precipitation sensor, the absence of damage to the connecting wire of the sensor, the absence of close power wires. Make sure that there are no contaminants on the sensor surface. Connect the redundant blue-white wire (see Fig. 7). If the problem cannot be resolved, contact the Service Center, otherwise the thermostat will continue without detecting moisture.
Heating of precipitation sensor does not work constantly when precipitation is detected, the bottom screen displays «OC» or «SC»

| open circut — break of the temperature sensor circuit in the precipitation sensor
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| short circut — short circuit of the temperature sensor circuit in the precipitation sensor

Possible cause: incorrect connection of the precipitation sensor, damage to the sensor circuit or temperature is beyond the measured limits (see Techn. data).
It is necessary to: check the precipitation sensor and the integrity of its cable. Connect the backup internal temperature sensor — green and white wire (see Fig. 7).
If the problem persists, contact the Service Center. Thermostat operation in case of temperature sensor damage in precipitation sensor. Heating of the precipitation sensor will be turned on for 20 minutes every hour. The load will be turned on when there is moisture and air temperature within the specified limits.
Every 5 seconds the bottom screen displays «Err»,  the load is working, the heating of the precipitation sensor is not working

| Cause: break of the heater of the precipitation sensor.
It is necessary to: check the precipitation sensor and the integrity of its cable. Connect the backup heater orange-white wire (see Fig. 7). If the problem persists, contact the Service Center.
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Operation of the thermostat in case of damage to the heater of precipitation sensor. Damage is determined if it is impossible to heat the precipitation sensor to 3 °С for more than 1 hour. Then the thermostat monitors the presence of moisture without the participation of internal heating and turns on the load in the presence of humidity and air temperature within the established limits. To clear the error, use manual heating control or reset the thermostat by turning on/off the power.
The middle screen displays «Err», the load and heating of the precipitation sensor do not work

| Cause: the precipitation sensor detects the presence of moisture in time more than set in the «Moisture Timeout» (see Tab. 1), which can be caused by contamination of the surface of the precipitation sensor.
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It is necessary to : check and clean the surface of the precipitation sensor. To clear the error, use manual heating control or reset the thermostat by turning on / off the power.
If the precipitation sensor fails, check:

Таble 2. RESISTANCE OF EXTERNAL TEMPERATURE SENSOR at different ambient temperatures

ADDITIONAL INFORMATION
Do not fire and do not throw away the device with the household waste.
After the end of its service life, the product must be disposed of in accordance with applicable law.
Transportation of goods carried in the package, ensuring the safety of the product.
The devi e is transported by any kind of transport (rail, sea, motor, air transportation).
Date of manufacture is on the back side of device. Application time is unlimited.
If you have any questions or you something will not clear, call the Service centre the telephone number listed below.

SAFETY INSTRUCTIONS

Carefully read and become aware of yourself these instructions.
Connection of the device must be done by a qualified electrician.
Do not connect 230 V mains voltage instead of the sensor (it leads to failure of the thermostat).
Before the installation (dismantling) and connection (disconnection) of the device, turn off voltage supply and also act according to the «Rules of an arrangement of electric installations».
Do not immerse the sensor with a connecting wire in the liquid medium.
Do not switch the non assembled device to the network.
Turning on and off or and configure the device should be with dry hands.
Do not connect the device to the network disassembled.
Avoid hitting of water or moisture to the device.
Do not expose the device to extreme temperatures (higher than 40 ºС or below 5 °C) and high humidity.
Never clean the device with the use of chemicals such as benzene, solvents.
Do not store the device and do not use it in areas with the dust.
Do not attempt to disassemble and repair the device.
Do not exceed the landmarks value adaptor and power.
To protect against overvoltage caused by lightning discharges, use a lightning protector.
Protect the children from games with the working device, it is dangerous.

VF23_ 220822
Low Voltage Directive 2014/35/EU
EMC Directive 2014/30/EU
Manufacturer and vendor: DS ELECTRONICS, LTD
04136, Ukraine, Kyiv region, Kyiv, 1-3 Pivnichno-Syretska str.
+38 (091) 481-91-81, Service Center: +38 (091) 481-91-81
support@dse.com.ua
www.ds-electronics.com.ua/en/

Documents / Resources

| terneo sneg + OSA Smart Control of Heating [pdf] User Manual
sneg OSA Smart Control of Heating, sneg OSA, Smart Control of Heating, Smart Control, Control
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References

• Voltage relays ZUBR and thermostats terneo
• Voltage relays ZUBR and thermostats terneo

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