ELEKTRA ELEKTRA DM Guida d'installazione

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Installation manual UK

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ELEKTRA DM

ELEKTRA UltraTec

• Single-side powered,

power output 10 W/m

Thin Heating Cables

Application

The thin heating cables ELEKTRA DM and

ELEKTRA UltraTec are primarily intended for use

in rooms with a tile or natural stone floor

covering.

Additionally, they can be used with floor

covering materials as:

• Fitted carpet,

• Vinyl flooring,

• Parquet or other wooden covering,

• Laminate.

Fitted carpets and Vinyl flooring, however,

should be suitable for use with electric underfloor

heating and bear the following markings:

The thin heating cables can be laid directly on

concrete floors, self-levelling concrete slab, as well

as old ceramic tiles, terrazzo or water resistant

wooden floors.

The thin heating cables are laid in a thin layer

of flexible adhesive or self-levelling concrete slab.

They are usually used as a supplementary floor

heating system, in order to provide the user with

a “warm floor effect”. They, can however, be

used as a primary heating system.

o

+C

Fitted carpet

Vinyl flooring

3

4

Product Features

• Available as ready-to-install sets,

with the lengths from 9 to 205 m.

• Terminated at one side with a screened 2.5 m

long power supply cable, and with a joint

at the other side.

• Power output: 10 W/m.

• Power supply: 230V 50/60 Hz.

• The heating cables are screened, and power

supply connected with a RCD providing full

anti-shock protection.

ELEKTRA DM heating cables:

cable external diameter – 4.3 mm.

ELEKTRA UltraTec heating cables:

cable external dimensions – 2 x 3 mm.

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ELEKTRA

1

2 3

Because of the thin nature, ELEKTRA UltraTec

cables can be used in applications where

elevating the floor level is not an option.

5

The power output of the heating cables

can vary +/-5% from the provided

nominal specifications.

The heating cables are suitable for

a 230V/50Hz rated voltage.

Note:

The following symbols are placed on the rating

labels of the Elektra heating cables:

Single-side powered

heating cable.

Direct in-floor heating.

“cold tail” power supply cable

heating cable

joint connecting the heating cable

with the power supply cable

1

2

3

6

Materials and tools

required for the heating cables installation

 the ELEKTRA

heating cable

 a 1.5 m long flexible

protective conduit

 a 2.5 m long flexible

protective conduit

terminated at one end

with a rubber stopper

 European deep installation

box

 Installation tape

 Temperature controller

 Scissors/cutters

 Ohmmeter (multimeter)

 Insulation Resistance Tester

 Tools for cutting chases

in walls and floors

– included

with heating cable

– included

with heating cable

– included

with heating cable

– included

with heating cable

– included

with heating cable

– included

with heating cable

Never cut the heating cables.

Never shorten the heating cables.

Only cold tails may be made shorter,

if necessary.

Never attempt to squash the “cold tail”.

Caution:

( )

option

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7

Never attempt a self-repair of the heating

cables. If the heating cables are damaged,

please contact an ELEKTRA authorized

installer.

Never expose the heating cables to

excessive stretching, stress or hit them

with sharp tools.

Never attempt to lay the ELEKTRA DM

heating cable if the ambient temperature

drops below -5°C (for the UltraTec cable:

-20°C ).

Never install the heating cables in places

where fixed furniture is planned (e.g. floor-

level wardrobes, kitchen units, baths).

Never use installation materials other than

those specified in the installation manual.

Never use nails or screws of any kind for

installation of the heating cables.

Caution:

Always install the heating cables

according to the installation manual.

Electrical connection of the heating cables

must be always performed by a certified

electrician.

The minimum distance between the

heating cables and other heat sources

(e.g. hot water pipes) should always

exceed 25 mm.

Caution:

8

Choosing the right

heating cable

Before choosing the correct size of the heating

cable (or cables, if a large room area requires this),

plan their arrangement on the entire floor, or the

selected floor areas. The heating cables must not

be laid in places where fixed pieces of furniture

will be positioned.

Supplementary heating

– “warm floor effect”

• Ceramic tiles and stone floors

The heating cables should be laid at a distance

of 8 cm from one another. If this distance is

higher than 10 cm, the floor surface temperature

could noticeably feel uneven (the temperature

differences over 2°C).

The closer the cables are arranged, the faster

a “warm floor effect” will be provided.

• Wooden floors, Vinyl

or fitted carpet floorings

The heating cables should be laid at a distance

of 10 cm from one another.

Heating Cables

ELEKTRA

installation box

temperature sensor

9

Primary heating

When selecting the heating cable,

it is necessary to consider:

• The heat demands of the room (necessary to

cover the heat losses and maintain the required

temperature level).

• The fixed-furniture-free floor area, where the

heating cable can be laid.

• The heating cables should be laid at the

maximum distance of 10 cm from one another,

so that the underheated or cold spots do not

occur.

• The heating cables should be laid at a minimum

distance of 4 cm from one another for the

UltraTec cable or 5 cm for the DM cable,

for ceramic tile finishing.

• The distance between the heating cables

for wooden floors, Vinyl or fitted carpet

should be 10 cm.

1

2

1

2

10

Choosing the temperature

controller

A temperature controller is a core component of

any floor heating. The controller connects the

heating cable with the electrical system and

ensures that the required temperature of the floor

or ambient air in the room is maintained.

• If the heating cables serve as a supplementary

heating source in the room and the user

desires merely to enjoy a warm floor feeling,

then a controller equipped with a floor

temperature sensor is sufficient to keep the

required temperature of the floor.

• If the heating cables are the primary heating

source in the room, then what the user usually

wants is the optimum ambient temperature.

In this case, a temperature controller that

can measure air temperature should be

installed. Such a temperature controller should

be equipped with both an air temperature

sensor and an additional floor temperature

sensor (while measuring the ambient tempera-

ture, it protects the floor and the heating cable

from overheating).

For temperature control, either a manual electro-

nic controller may be used which keeps constant

temperature or a programmable electronic

controller which can be programmed in a daily

and/or a weekly cycle.

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Heating

type

Temperature controller type

Manual

Temperature controller

may be installed under a common faceplate

with a lighting switch (not applicable in the UK).

Temperature

sensor

ELEKTRA

OTD2 1999

ELEKTRA

OCD2 1999

OCD4 1999

Primary

Supplementary

for the “warm

floor effect”

ELEKTRA

OTN 1991

OTN2 1991

OTD2 1999

ELEKTRA

OCC2 1991

OCD2 1999

OCD4 1999

DIGI2p

Programmable

12

Installation

Step I – preparation

As preparation for the installation take the

following steps:

1. Choose a location for the temperature

controller. For aesthetic and practical reasons,

it is best to install the controller next to the

lighting switches (e.g. under a common

faceplate; not in the UK).

2. Install a deep installation box for the

temperature controller.

3. Install a suitable 3-wire power supply to the

thermostat position/installation box. Connect

the power cable.

4. Install 2 flexible conduits (diameter 15 mm)

between the installation box and the floor.

The flexible conduits should be laid

in previously made chases in the wall

and the floor. The floor groove should have

a minimum depth of 15 mm and extend

into the heated surface for at least 500 mm.

Later, when the heating cable is installed,

the temperature sensor cable will be fed

into one of the flexible conduits (2.5 m),

and the cable’s cold tails to the other (1.5 m).

The “cold tail” should be positioned in

a specially made floor groove - the joint

connecting the heating cable with the

power supply.

Caution:

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Power supply cable

Deep installation box

for the temperature controller

Flexible protective conduit

for the floor temperature sensor

Flexible protective conduit

for the cable's cold tails

2

3

4

1

2

3 4

14

If the heated area is not adjacent to the

temperature controller and the protective

conduit is extended into the floor for more

than 1.0 m, it may be necessary to install an

additional installation box close to the floor.

Such solution would facilitate the easy

exchange of the temperature sensor.

A draw wire is a flexible wire positioned

inside the protective conduits which helps

feeding the floor sensor cable together with

the cold tails into the deep installation box

easily, just after the plastering or laying

the tiles.

Do not bend the flexible protective

conduits at 90° angle at the junction of

the wall and floor - keep the curve shape.

The curve shape of the protective conduits

guide would enable the easy exchange of

the temperature sensor, if required.

Caution:

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Step II – laying

the heating cable

• A floor prepared for heating cable laying

should be smoothed, cleaned and primed,

which will enable hot-glueing the cable to

the floor surface.

• The temperature sensor cable should be fed

into the protective flexible conduit installed

in the preparation step. Seal the conduits

floor ending with a rubber stopper to protect

the sensor against moisture penetration.

• Lay the heating cable on the floor making

sure that it will not be positioned directly

under the fixed furniture, and fasten

the cable with the installation tape.

If the heating cable has been arranged

wrongly, you can peel off the installation

tape and change the cable's position.

•

16

Caution:

While the cable is being fixed, ensure

an even distance between the cables.

Laying the cable should start from the

cold tail side, so that the cold tail could

easily reach the installation box.

• After the cable is laid, it should be hot-glued

to the floor.

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Step III – after fixing the cable

to the floor

When the cable has been fixed to the floor the

following actions should be performed:

• the area directly under the connecting joint

between the heating cable and the cold tail

should be deepened, as the joint is thicker

than the heating cable,

• enter the heating cable cold tail into the

installation box through the protective conduit

mounted at the step 1: preparation,

• enter the temperature sensor cable into the

installation box,

• make a sketch (or photograph) of the heating

cable floor arrangement and the temperature

sensor position in the Warranty Card,

• perform measurements:

- heating wire resistance,

- insulation resistance.

Caution:

The temperature sensor cable

should be positioned just between

the heating cables.

PE

(yellow-green)

L

(brown or

black

N

(blue)

1

2

3

Heating wire’s

resistance measurement

Insulation

resistance measurement

L

(brown or

black

18

The insulation’s resistance for the heating cable,

as measured with a tool of the rated voltage

1000 V (e.g. megaohmmeter), should not be

below 10 MW. Enter the results into the

Warranty Card.

When the floor has been finished, repeat the

measurements and compare the results to

ensure that the heating cable has not been

damaged while laying the floor.

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1

2

3

Cold tails

Ohmmeter

Megaohmmeter

Step IV – floor finishing

Caution:

When the floor finishing works

have been completed, it is necessary

to repeat the measurements of the:

- heating wire resistance,

- insulation resistance.

Step V – temperature controller

installation

Connection of the heating cable with household

wiring should be made by a certified electrician.

Connections of the following cables with the

temperature controller:

1. power supply cables of the electric system,

2. heating cable’s cold tails,

3. temperature sensor

in the temperature controller installation box,

should be carried out according to the instruc-

tions included in the controller’s installation

manual.

20

Caution:

The heating cable's earth cables (PE)

should be connected to the earth (yellow

and green) of the household wiring with

a special terminal on the temperature

controller.

If there is no such terminal on the tempe-

rature controller’s housing, the connection

should be made separately using a wire

connector which will be placed in the

installation box.

If several heating cables were installed in

the room, connect them in parallel, i.e.

cables with the same markings (the same

colour) should lead to the same terminals

on the temperature controller.

Heating Cables

ELEKTRA

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