LK Systems ETO2 Manuel utilisateur

1 (10)

Function

When the ground sensor detects moisture while

the ground temperature is so low that there is a

freezing hazard, the control unit starts snow melt-

ing via the external control equipment. When the

ground sensor is dry, the snow melting is shut

off. The unit can be programmed to maintain the

heating activated for the desired time even if the

ground sensor is dry.

1. Install the control unit indoors either direct-

ly on the wall or on the DIN rail.

2. Start/stop signal to the property's BMS

is drawn from the pump inlet in the LK

Control unit ETO2 terminals 3, 4. (NOTE!

Potential-free contact).

3. Connect the LK Ground sensor ETOG ac-

cording to the instruction under the head-

ing LK Ground sensor ETOG.

4. Pump and actuator are not connected to the

LK Control unit ETO2 in this case.

5. Connect the power supply, see the circuit

diagram.

6. Adjust the control unit, see the heading

Adjustment to start/stop of external control

equipment.

Design

LK Control Unit ETO2 is meant to be used pri-

marily as LK Snow melting must be controlled in-

termittently. The equipment consists of LK Con-

trol Unit ETO2, LK Ground sensor ETOG and LK

Pipe sensor ETF.

LK Control Unit ETO2 offers the following:

• Energy-efcient control of the snow melting

system.

• Simple menu navigation.

• Clear background-lit display.

• Alarm relay.

Note!

The control unit can, depending on how it is set,

either maintain/regulate the ow temperature to

the snow melting system or only generate start/

stop signals to the external control equipment.

The instruction is divided into two different chap-

ters depending on the function desired. If the unit

should maintain/regulate the ow temperature,

follow the instructions Assembly instruction,

Maintaining the ow temperature. If the unit

should send start/stop signals to external control

equipment, follow the instructions below.

Assembly instruction, start/stop of

external control equipment (BMS)

The following instruction is applicable when

LK Control unit ETO2 must send start/stop sig-

nals to the external control equipment. The con-

trol unit and sensor must only be installed by an

authorized electrician.

LK Control Unit ETO2

EN.31.C.5.1907

Assembly instructions | LK Control Unit ETO2

2 (10)

EN.31.C.5.1907

Assembly instructions | LK Control Unit ETO2

The unit can also control the start/stop function

of the circulation pump in the snow melting sys-

tem. When the ground sensor is dry, the snow

melting is shut off. The unit can be programmed

to maintain the heating activated for the desired

time even if the ground sensor is dry.

1. Install the control unit indoors either direct-

ly on the wall or on the DIN rail.

2. Connect the LK Ground sensor, see the cir-

cuit diagram under the heading LK Ground

sensor.

3. Connect the LK Pipe sensor, see the circuit

diagram under the heading LK Pipe sensor.

4. Connect the actuator, see the circuit dia-

gram under the heading Actuator.

5. Connect the system's circulation pump,

see the circuit diagram under the heading

Pump relay.

6. Connect the power supply, see the circuit

diagram and the heading Supply voltage.

7. Adjust the control unit, see the heading Ad-

justment, Maintain the ow temperature.

Adjustment, maintain the flow temperature.

First time the control unit is charged, it must be

adjusted to the snow melting system. The adjust-

ment is done with the unit's multifunction button

(MF-button). Turn until the right menu is shown

on the display, conrm by pressing the button

once.

Note!

For the following description to be correct, it is

important that the unit is not powered up earlier.

If this has been done, the unit needs to be reset,

see REINSTALL in the table under Settings.

1. Select Celsius degrees, conrm by pressing

the MF button.

2. Select Sensor ETOG, conrm by pressing

the MF button.

3. Set Sensor 2* to OFF, conrm by pressing

the MF button.

4. Set Outdoor sensor to OFF, conrm by

pressing the MF button.

5. Set Application to Water based, conrm by

pressing the MF button.

6. The unit changes to normal view and the

Adjustment to start/stop of external control

equipment.

First time the control unit is charged, it must be

adjusted to the snow melting system. The adjust-

ment is done with the unit's multifunction button

(MF-button). Turn until the right menu is shown

on the display, conrm by pressing the button

once.

Note!

For the following description to be correct, it

is important that the unit is not powered up

earlier. If this has been done, the unit needs to

be reset, see REINSTALL in the table under the

heading Settings.

1. Select Celsius degrees, conrm by pressing

the MF button.

2. Select Sensor ETOG, conrm by pressing

the MF button.

3. Set Sensor 2* to OFF, conrm by pressing

the MF button.

4. Set Outdoor sensor to OFF, conrm by

pressing the MF button.

5. Set Application to ELECTRIC 1-zone,

conrm by pressing the MF button.

6. The unit changes to normal view and the

system is now ready for operation.

* Read more about sensor 2 under the heading

Ground sensor.

Assembly instruction, Maintaining

the flow temperature.

The following instruction is applicable for when

LK Control Unit ETO2 is to maintain/regulate

the feed temperature to the snow melting system.

The control unit and sensor may only be installed

by an authorized electrician.

Function

When the ground sensor detects moisture, and

the ground temperature is so low that there is

a freezing hazard, the control unit starts snow

melting by activating the control valve via the

motor/actuator. The control unit keeps the ow

temperature constant to the desired level with

the help of a ow sensor (LK Pipe sensor ETF).

3 (10)

EN.31.C.5.1907

Assembly instructions | LK Control Unit ETO2

system is now ready for operation.

7. Check that MY Water is set to 5 degrees, see

the heading Settings.

8. Before the system is started, the maximum

temperature value must be controlled, see

the heading Settings/MAX WATER.

* Read more about sensor 2 under the heading

Ground sensor.

Principle drawing, control via 3-way valve.

4 (10)

EN.31.C.5.1907

Assembly instructions | LK Control Unit ETO2

The ground sensor must be installed by an au-

thorized electrician in accordance with applicable

regulations.

The connection is carried out according to the cir-

cuit diagram and below table:

Terminal number in the

control unit

Cable color, LK Ground

sensor 1

11 Brown

12 Green

13 Grey

14 Pink

15 Yellow

16 White

Connection of additional LK Ground sensor

(Sensor 2)

In case two ground sensors are required, sensor

number two is connected according to the circuit

diagram and the table below.

Terminal number in the

control unit

Cable color, LK Ground

sensor 2

11 Brown

12 Green

17 Grey

18 Pink

19 Yellow

20 White

When the extra sensor is installed, it must be ac-

tivated in the control unit for it to work. The ac-

tivation is done when the control unit is adjusted

to the LK Snow melting. Follow the instruction

under the heading Adjustment, Maintain the

ow temperature and Adjustment to start/stop

of external control equipment, but set Sensor 2 to

ON (point 3 in the instruction).

LK Ground sensor ETOG

Function

LK Ground sensor ETOG detects both tempera-

ture and moisture. Usually, it is enough to con-

nect one LK Ground sensor ETOG to the control

unit but in some cases, two ground sensors may

be required to achieve a satisfactory function, for

example a ground area that stretches around the

building and thereby extends to both North and

South locations.

Placement in the ground.

1. LK Ground sensor ETOG must be placed in

the ground within the heated area, where

snow/ice is suspected to remain for the

longest duration. The sensor is placed in

between two pipes

2. Prepare the assembly by drawing one

electric pipe to the place where the sensor is

to be installed. Place a wooden block or an-

other "template" instead of the sensor until

the ground surface is ready.

3. Then install the sensor at the top of the

ground surface using the delivered metal

plate template. Make sure that the sensor is

horizontal with the ground. NOTE! Make

sure that the sensor is installed with the

right side up. (The screw hole in the sensor

should be upwards).

4. Seal with concrete around the sensor so that

it is xed in the correct position.

Placement of the LK Ground sensor ETOG in the ground.

Connection

On delivery, the sensor is provided with a 10 me-

ter connection cable which is possible to extend

up to 200 m. Use an installation cable with at

least 6 pcs of 1,5 mm² threads. The cable should

be shielded and must not be installed in paral-

lel with current cables as this can lead to signal

disturbance.

5 (10)

EN.31.C.5.1907

Assembly instructions | LK Control Unit ETO2

Connection the LK Pipe sensor, supply

The sensor intended to measure the supply tem-

perature is connected according to the circuit dia-

gram and the table below.

Terminal number LK Pipe sensor, supply

27 Electrical conductor, any color*

28 Electrical conductor, any color*

*The sensor has no polarity

Connection LK Pipe sensor, return

The unit is delivered with a built-in 10 kOhm

resistor between terminals 29 and 30, which

means that the unit believes the return tem-

perature to be constant at approx. 30 degrees.

Only in cases where a system must have a high

readiness for snow melting, such as a helipad

or ambulance intake, the resistor is replaced

by the LK Pipe sensor for measuring the re-

turn temperature. With a return temperature

sensor installed, the control unit will start the

snow melting when the return temperature is be-

low the set value.

The sensor to measure the return temperature is

connected according to the circuit diagram and

the table below.

Note!

A sensor installed as shown below means a

strong increase in the system's energy consump-

tion. Unless the system has access to waste heat/

free heat, carefully consider installing this.

Terminal number LK Pipe sensor, return

29 Electrical conductor, any color*

30 Electrical conductor, any color*

*The sensor has no polarity

Calibration of the ground sensor

If necessary, the temperature value for the ground

sensor can be calibrated according to the instruc-

tions below:

1. Disconnect the sensor cables that are con-

nected to terminals 11 and 12. (Feed to heat

element).

2. Wait for a few hours until the sensor and

the ground attain the same temperature.

3. Measure the actual ground temperature

with the external measuring equipment,

compare with the value that is shown on

the display.

4. Set the OFFSET temperature for the

current sensor.

5. Connect the sensor cables to terminals 11

and 12. (Feed to heat element).

Note!

The temperature displayed for the ground sensor

is always the ground temperature (core tempera-

ture in the sensor).

LK Pipe sensor ETF

Function

LK Pipe sensor measures the temperature of the

snow melting system's supply pipe in order for

the control unit to be able to maintain/regulate

the supply temperature at the set level. The pipe

sensor is connected when the control unit must

regulate/control the supply temperature.

Assembly on pipes

Assemble the sensor to a suitable location on the

supply pipe, using the mounting strap supplied.

Clean the surface properly so that good contact

is attained. If necessary, the sensor body can be

insulated to avoid incorrect measurement data.

6 (10)

EN.31.C.5.1907

Assembly instructions | LK Control Unit ETO2

Selected mode Application* Function relay

Start/stop of

BMS

Electric mode

1 zone

Relays 1, 2 and 3 ener-

gized at the same time

Start/stop of

BMS

Electric mode

2 zone

Relay 1 is energized

where zone 1 is active.

Relay 2 is energized

where zone 2 is active.

Maintain ow

temperature

Water based Relay 1 and relay 2 are

energized at the same

time. Relay 3 is unaf-

fected.

* See the heading adjustment below

Connection of supply voltage

Connection of supply voltage is carried out ac-

cording to the circuit diagram.

Remote control

Remote control, forced start

The control unit is equipped with an input to

remotely control/force start the system even if

there is no "real" need. On activated input (closed

contact), the heat is connected and continues un-

til the after heating time reaches value zero. Re-

mote control of forced start is connected between

terminals 35 and 36.

FORCED

CONTROL

HEAT

ETO2

Remote control, forced standby

Forced Standby is used when you don´t want the

unit to start even if there is a need. On activated

input (closed contact), a forced standby is activat-

ed. The function is connected between terminals

33 and 34.

Actuator

LK Control unit ETO2 sends control signals to

impact the 0-10 V actuator (24 V AC 0-10 V, not

LK item). The actuator is connected according to

the table below.

Principle drawing, connection of 0-10 V actuator.

Terminal number Connect to:

21 COM on actuator

22 Control signal (0-10 V)

23 Strapped to terminal 21

24 24 V AC feed to actuator

25, 26 Transformer 24 V AC

Pump relay

The control unit is equipped with three potential-

free relays (not powered), which if necessary,

can start/stop the system's primary/secondary

pumps or be used to start/stop the external con-

trol equipment. Connection is made according to

the circuit diagram.

Depending on how the device has been set, the

relays have different functions, see table below.

7 (10)

EN.31.C.5.1907

Assembly instructions | LK Control Unit ETO2

STAND

ETO2

Menus/Settings

All menu management and conguration of all

settings is done using the multi-function button

(MF button). Turn until the right menu is shown

on the display, conrm by pressing the button

once.

Normal view

When the unit is powered, the display shows a

normal view with information on the unit's oper-

ation mode. By pressing the MF button once, the

display shows more detailed information about

the operation mode. See below a list of the infor-

mation displayed in the normal view.

Display text Explanation

ZONE 1 ON = Heating activated for zone 1.

OFF = Heating deactivated for zone 1.

ZONE 2 ON = Heating activated for zone 2.

OFF = Heating deactivated for zone 2.

SENSOR 1 Shows the ground temperature for ground

sensor 1. Note! Does not show the air

temperature.

SENSOR 2 Shows the ground temperature for ground

sensor 1.

Note! Does not show the air temperature.

MOIST 1 Moisture status for sensor 1, YES, NO or

blank value. Blank value is displayed if the

temperature is above the set start value or

if the unit is operating in Afterrun mode.

MOIST 2 Moisture status for sensor 2, YES, NO, or

blank value. Blank value is displayed if the

temperature is above the set start value or

if the unit is operating in Afterrun mode.

OUT TEMP Air temperature outdoors, not used for

snow melting.

SUPPLY W. Temperature of the supply water

RETURN W. Temperature of the return water.

8 (10)

EN.31.C.5.1907

Assembly instructions | LK Control Unit ETO2

Settings

Settings are made under the heading Setup. The menu becomes accessible by pressing the MF button once,

when the unit's display is in normal view. Thereafter, select SETUP and conrm with the MF button.

Below is a list of the different menus available under SETUP and the options available under the menus.

Function Description Selectable value

FORCE HEAT Used to force the snow melting to start. Snow melting is

activated for the time given under the heading Afterrun.

Select ON or OFF.

SELECT SCALE Indicates the temperature scale to be used Select C or F.

SET TEMP 1 For the unit to start, the temperature must be below the

given value. (The value refers to ground sensor 1.)

Select between -20 - + 50 ºC.

Default + 3 ºC

SET TEMP 2 For the unit to start, the temperature must be below the

given value. (The value refers to ground sensor 2.)

Select between -20 - + 50 ºC.

AFTERRUN 1 Indicates how long the unit continues to operate after ground

sensor 1 perceives the ground surface as dry.

Select from 0 minutes to 18 hours.

AFTERRUN 2 Indicates how long the unit continues to operate after ground

sensor 2 perceives the ground surface as dry.

Select from 0 minutes to 18 hours.

SET TEMP 1 Lowest start temperature for ground sensor 1. Select between -20 up to the adjusted

SET TEMP 1 or OFF (OFF = no limit.)

SET TEMP 2 Lowest start temperature for ground sensor 2. Select between -20 up to the adjusted

SET TEMP 2 or OFF (OFF = no limit.)

OFFSET T1 Used to calibrate ground sensor 1, see Calibration heading. Select between -5 to + 5 ºC

OFFSET T2 Used to calibrate ground sensor 2, see Calibration heading. Select between -5 to + 5 ºC

OFFSET OUT The function is not used for snow melting. -

MIN WATER Indicates the lowest return temperature for the system. On

delivery, the unit is provided with a resistor instead of a re-

turn temperature sensor. The resistor corresponds to a xed

return temperature of 30 ºC.

Select between 0 and 40 ºC.

Default + 3 ºC

MAX WATER States the highest supply temperature for the system.

NOTE! MAX VALUE is 50 ºC for LK Snow melting.

Select between 0 and 60 ºC.

FACTORY RESET Reset the unit to factory setting. Select EXIT or RESET

Sensor Heat Auto When snow melting is activated, the heat-supply to the

sensor is switched o󰀨. In case of extreme circumstances,

heating of the sensor may occur continuously.

Select Auto or ON

MOIST CTRL The ground sensor's moisture sensor can be switched o󰀨.

Then the power on/o󰀨 of the snow melting is controlled only

on the basis of the set temperature.

NOTE! When OFF is selected, the energy consumption

increases signicantly.

Select ON or OFF

SENSITIVITY The sensor's moisture sensitivity has ve settings. MN, LOW, NORM, HIGH and MAX

REINSTALL Facilitates re-installation of the unit. CODE is 1202. -

EXIT Exit menu setup. -

9 (10)

EN.31.C.5.1907

Assembly instructions | LK Control Unit ETO2

Circuit diagram

230 V AC Fuse

LK Systems

11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36

3456781-1-2NL

Alarm

No. Sensor

1 LK Ground sensor 1 ETOG

2 LK Ground sensor 2 ETOG, connected only if

necessary

3 LK Pipe sensor ETF, supply.

4 LK Pipe sensor ETF, return. Connected only if

necessary.

Alarm

If an error occurs in the unit, it is indicated with a

blinking LED-marked alarm.

Do the following to see the alarm in clear text:

1. Press once on the MF button, select

ALARM, conrm with the MF button.

2. The alarm is now shown in clear text, see

the table below.

Alarm Explanation

RETURN TEMP LOW Too low return temperature

SUPPLY TEMP HIGH Too high ow temperature

RETURN SENSOR Defect return sensor

SUPPLY SENSOR Defect supply sensor

TEMP SENSOR 1 Defect ground sensor 1

TEMP SENSOR 2 Defect ground sensor 2

OUTDOOR SENSOR Defect outdoor sensor

SENSOR HEATER Short-circuiting of the heating

element in the ground sensor

FROST PROTECT Frost protection activated due to

return temperature being too low

Interruption in the ground sensor

If there is an interruption in the ground sensor,

the unit sends an alarm and at the same time,

switches off the snow melting system.

Function control

After the connection and adjustment a function

control must be performed.

1. Increase SET TEMP to max, see the heading

Menus/settings.

2. Pour water on the ground sensor.

3. Check that the control unit display shows

ON.

4. Reset SET TEMP to the desired value

(default + 3 ºC).

10 (10)

Terminal No./

Symbol

Connected to: Note

11 LK Ground sensor 1, Brown cable Where applicable even connected to ground sensor 2, Brown cable.

12 LK Ground sensor 1, Green cable Where applicable even connected to ground sensor 2, Green cable.

13 LK Ground sensor 1, Grey cable

14 LK Ground sensor 1, Pink cable

15 LK Ground sensor 1, Yellow cable

16 LK Ground sensor 1, White cable

17 LK Ground sensor 2, Grey cable NOTE! LK Ground sensor 2 is connected only if needed, see the

heading LK Ground sensor ETOG.

18 LK Ground sensor 2, Pink cable NOTE! LK Ground sensor 2 is connected only if needed, see the

heading LK Ground sensor ETOG.

19 LK Ground sensor 2, Yellow cable NOTE! LK Ground sensor 2 is connected only if needed, see the

heading LK Ground sensor ETOG.

20 LK Ground sensor 2, White cable NOTE! LK Ground sensor 2 is connected only if needed, see the

heading LK Ground sensor ETOG.

21 Com on actuator Use 0-10 V actuator with 24 AC supply.

22 Control signal (0-10V) Use 0-10 V actuator with 24 AC supply.

23 Strapped to terminal 21

24 24 VAC supply to actuator Use 0-10 V actuator with 24 AC supply.

25, 26 Transformer 24 V AC

27 LK Pipe sensor, supply, Blue cable

28 LK Pipe sensor, supply, Brown cable

29 LK Pipe sensor, return, Blue cable NOTE! LK Pipe sensor 2 is connected only if needed, see the head-

ing LK Pipe sensor ETF.

30 LK Pipe sensor, return, Brown cable NOTE! LK Pipe sensor 2 is connected only if needed, see the head-

ing LK Pipe sensor ETF.

31, 32 Not used

33, 34 GSM-switch or other remote control Remote standby, closed contact switches of snow melting in ad-

vance.

35, 36 GSM-switch or other remote control Closed contact forces the unit to start, connected only if needed.

N, L 230 VAC

1-1, 2 Alarm output Max. load 5A.

3, 4 Pump or BMS Potential-free contact, Max. load 16A.

5, 6 Pump or BMS Potential-free contact, Max. load 16A.

7, 8 Pump or BMS Potential-free contact, Max. load 16A.

Technical Data

LK Control Unit ETO2

Article number 538 61 76

Dimensions 170 x 162 x 45

Weight 0.5 kg

Cable protection class IP20

Ambient temperature 0-50 °C

LK Ground sensor ETOG

Article number 538 61 77

Dimensions 32 mm x Ø 60 mm

Weight 1.0 kg

Cable protection class IP68

Ambient temperature -20 - +70 ºC

Cable length 10 m

Max cable length for extension 200 m

LK Pipe sensor ETF

Article number 538 61 78

Dimensions 40 mm x Ø 12 mm

Weight 0.1 kg

Ambient temperature -20 - + 70 ºC

Cable length 2.5 m

Sensor element NTC 12 k @25 C

EN.31.C.5.1907

Assembly instructions | LK Control Unit ETO2

LK Systems AB, Box 66, SE-161 26 Bromma, Sweden | www.lksystems.se/en

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