Danfoss Electric Heating Mats Installation guide

IMPORTANT!

DO NOT CROSS OR CUT THE RED CABLE

REMEMBER TO MEASURE, VERIFY AND

RECORD THE RESISTANCE

Danfoss

BRINGING WARMTH TO LIFE

LX

TM

Installation Manual

Electric Heating Mats

Manuel d'installation

Tapis chauffants électriques

Manual de instalación

Mallas calefactoras eléctricas

Table of Contents

LX Floor Heating System....................................... .......................................................................................................................................... 2

Typical Installations and Cautions ................................................................................................................................................................ 3

General Installation Guidelines ..................................................................................................................................................................... 4

Warranty................................................................................................................................................................................................................. 9

APPENDIX A: Typical Electrical Wiring

Spécifications techniques des tapis chauffants Danfoss LX .................................................................................................................... 10

Installations typiques et mises en garde......................................................................................................................................................... 11

Instructions d'installation d’ordre général ..................................................................................................................................................... 12

.

.......................................................................................................................................................... 26

Garantie ...................................................................................................................................................................................................................... 17

ANNEXE A: Câblage Électrique Typique........................................................................................................................................................... 26

Sistema de calefacción por suelo radiante DanfossLX ............................................................................................ 18

Instalaciones y precauciones típicas. ........................................................................................................................................................... 19

Pautas generales de instalació ....................................................................................................................................................................... 20

Garantía .................................................................................................................................................................................................................. 25

APÉNDICE A: Cableado Eléctrico Típico

....................................................................................................................................................... 26

...............................

Copyright 2009 Danfoss Inc.

088L3380 - 06/09

TEL: [phone]. FAX: [phone]

1

Danfoss LX Floor Heating System

CAUTION!

It is important that this equipment is installed only by qualified electricians who are familiar with the proper sizing,
installation, construction and operation of floor warming system and the hazards involved. The heating mat is designed for
under floor heating purposes only.

Note!

The installation shall be in accordance with the manufacturer’s instructions and national and local codes.
The installation shall be in accordance with Part 424-J, American National Standard Institute / National Fire
Protection Association (ANSI/NFPA70), National Electrical Code (NEC) and Canadian Electrical Code (CEC),
Part 1. Danfoss recommends GFCI for heating cable in normally wet areas (i.e. bathrooms, showers, kitchens).

LX Mat Specifications

Type:
Voltage:
Output:
Heating Element Size:

Twin conductor
120V, 240V
12W/sq.ft. (130 W/m )
Width: 2’

2

Length: Refer to product label
Height: approx 1/8” (4 mm)

Cold Lead
Bending radius:
Wire insulation:
Casing:
Max. Allowable Temp.:
Min. Installation Temp.:

Note: Operating the 240V mat at 208V reduces power output to approximately 9W/sq.ft.
(25% reduction)

10’ (3.0 m)
Minimum 3/4” (19 mm)
FEP, Teflon

TM

PVDF
212°F (100°C)
40°F (5°C)

WARNING:

Remember to measure resistance.

Little Buzzer

Connection 120V

Phase - Black
Neutral - Blue
Ground - Shield

Connection 240V

Phase - Black
Phase - Blue
Ground - Shield

MONITOR YOUR INSTALLATION!

USE THE LITTLE BUZZER CONTINUITY

ALARM (PART#088L0028)

The resistance should be measured between the two conductors, blue and black. Compare the measured resistance to the resistance listed on
the product label (on the power lead).

Record the resistance on your warranty card.

infinity.

Copyright 2009 Danfoss Inc.

Also, measure the resistance between the blue, black and shielding/ground wire. Both should read

088L3380 - 06/09

TEL: [phone]. FAX: [phone]

2

Danfoss LX typical installations and applications

Directly on plywood:

Directly on concrete.

Alternative method: self-leveling cement is
recommended for large surfaces and the
following floor materials: engineered wood,
laminate, floating floors, vinyl, linoleum and
carpet.

Ceramic tiles

Thermostat sensor
Thinset cement adhesive

fanD oss LX
Plywood on joists
Joists
Insulation (optional)

Ceramic tiles

Thin set cement adhesive
Danfoss LX

Thermosta
Concrete

t sensor

Warning:

Consult the manufacturer for information on special
installation requirements for wood, laminate and
vinyl or linoleum flooring.

Caution!

=Read the instructions carefully before installing

LX mat

=Do not install LX mat in walls or ceilings;

=The mat must be embedded in mortar,

thinset, concrete or similar material;

=The minimum installation temperature is

40°F (5°C);

=Never cut the red heating wire;

=It is recommended to use AWG 16 or greater

copper wire only if you need to extend the cold
lead

=Never install the LX mat such that two red

heating wires touch, cross or overlap;

=Measure the resistance between the blue,

black and shielding/ground wire. Both should
read infinity.

lRe memb er to al ways me asur e, ver ify and

record the actual resistance throughout the
install ation process (out of the box, af ter
installation, before thin set cement or self-leveler
application and after installation of floor tiles) and
compare all reading to the ratings on the product
label.

lRemember to check that the supply voltage

matches the voltage of the Danfoss LX mat;

lRemember to place the labels as written in

this instruction;

lOnly for indoor installation;

lMetal struct u res or materials used for the

support of or on which the Danfoss LX mat is
insta lled m ust be gro u nded in a ccorda n ce
with CSA Standard C22.1, section 10 and the NEC.

Please consult the factory for any other
questions or advice;

Copyright 2009 Danfoss Inc.

088L3380 - 06/09

TEL: [phone]. FAX: [phone]

3

General Installation Guidelines

1

2

Step 1. PLAN LAYOUT

Make a sketch layout or a floor plan of the room;
include all permanent furnishings such as toilets,
bathtubs, appliances, cabinetry, etc. Indicate all
dimensions required to determine the available floor
are a and the position of th e LX thermo s t at.

TIP: Danfoss recommends installation is documented
with photos to note the location of connections and
the sensor.

Step 2. TRANSFER LAYOUT TO FLOOR

Draw an outline of the layout on the room floor including
a foot print of all furnishings that are not yet
installed. Unroll the first few feet of the LX mat. The
starting point of the cable must be placed within 10 ft.
from the thermostat. Mark the position of the connection
point between the power lead and the red LX heating
cable. This connection must be concealed in thinset or
self-leveling cement. When using a floor temperature
sensing thermostat, mark the sensor position in the
middle of 2 heating cables, about 10 in. (25cm) away from
the wall (within the heated area), as close as possible to
the thermostat.

Copyright 2009 Danfoss Inc.

3A

088L3380 - 06/09

Step 3. INSTALL SENSOR

(recommended in conduit, part#19809099 included)
If using a floor temperature sensing thermostat, install
the sensor now, either in conduit tube, or directly to
the subfloor. It is recommended that the sensor be
installed in conduit tube. This will allow the sensor
to be easily replaced in the unlikely event of failure.

The sensor and/or tube needs to be installed between
the thermostat wall box and the sensor position.
The conduit tube must be partially countersunk into the
subfloor. Cut a channel 5/16” deep by 5/16” wide in the
floor and wall up to the thermostat large enough to
accommodate the sensor conduit. The conduit has to go
from the thermostat and minimum of 10 “ away from the
wall towards the middle of the floor.

TEL: [phone]. FAX: [phone]

4

4

IMPORTANT: the sensor conduit must be centered in
the cable loop (between two red heating wires).

Seal the end of the conduit that is placed in the floor with a
piece of duct tape. This will prevent thinset from penetrating
the conduit.

Use duct tape to hold the sensor conduit into the groove to
prevent it from floating up when the mortar or thinset is
poured.

If the sensor is installed directly in the mortar bed, use duct
tape to secure to subfloor.

Step 4. PREPARE SUBFLOOR SURFACE

Clean and vacuum the floor thoroughly and remove dust
and debris from the floor that may damage the heating
cable or reduce adhesion.

Ensure that the subfloor is secure and stable. Carefully fill
in all cracks to prevent any potential damage to the new
tiles resulting from shifts in the subfloor.

5A

(Optional) To ensure maximum adhesion, apply a primer
or sealer as recommended by the thinset or self-leveling
cement manufacturer. If using a primer, ensure that the
entire floor is covered. Allow the primer to dry thoroughly
before proceeding to the next steps.

Step 5A. MEASURE THE RESISTANCE

Use a digital ohm meter to measure the resistance of
the Danfoss LX mat and compare it to the resistance listed
on the product label. The resistance should be measured
between the two conductors, blue and black. Compare
the measured resistance to the resistance on the product
label, located 3 inches from the splice, on the cold lead.
Also, measure the resistance between the blue, black and
shielding/ground wire. Both should read infinity.

Record the measured resistance on the warranty
card. Documenting the resistance at each stage of
in stallatio n is req uired for warra nty purpose s.

Copyright 2009 Danfoss Inc.

088L3380 - 06/09

TEL: [phone]. FAX: [phone]

5

5B

Step 5B. INSTALL THE LX MAT

An adhesive has been added to the bottom of the mat
which will prevent the mat from moving during
installation. Start by placing the mat such that the
connection point and the temperature sensor are in their
intended positions and bring the power cable to the
thermostat or connection box.

Begin unrolling the LX mat evenly across the floor
outside the areas that you marked previously.
The adhesive on the mat is made such that the mat may
be mo ved s ever al t i mes b e fore i t l ose s i ts
adhesiveness. When you reach the next wall, cut
the grey mesh, turn the mat, and begin rolling
in the desired direction.

NEVER CUT OR SHORTEN THE RED HEATING CABLE!

Ensure that the LX mat is in full contact with the
subfloor at all times. Avoid walking on the heating
mat. If this is not possible, use shoes with soft soles.

When approaching obstacles (toilets, cabinets, etc.),
carefully remove some of the red heating cable
f r o m t h e m a t a n d l e a d t h e c a b l e
around the obstacle. In some cases pieces of the
grey mesh will be cut away entirely. Remember to never
cut the red cable. Use hot melt glue or a thin strip of tape
to secure the loose cable to the floor.

Copyright 2009 Danfoss Inc.

088L3380 - 06/09

TEL: [phone]. FAX: [phone]

6

6

Step 6. INSTALL FLOOR COVERING

Measure the resistance in the mat and record it on the
warranty certificate. It is highly recommend to take

photographs of the installed LX mat before installing
the flooring.

ENSURE THAT THE SENSOR CONDUIT HAS BEEN
PROPERLY INSTALLED BEFORE PROCEEDING (see Step 3).

In the case of tiles, proceed with the installation of the tiles
by covering the heating cables with a layer of thin-set
cement as directed by the tile manufacturer. Ensure that the
thin-set mortar covers the entire height of the heating
cable as the tiles are installed. In the case of a wood,
engineered or laminate floor covering, it is recommended
that the flooring manufacturer be contacted. For wooden
floors, a minimum of 3/16 in. of self-leveling cement over
the heating cable is recommended. Ensure that all
moisture in the self-leveling cement has been fully
eliminated in accordance with the drying times
recommended by the manufacturer (consult the
manufacturer for exact drying time).

Once the thin-set cement has dried, measure the
resistance in the mat and record it on the warranty
certificate. The LX mat must not be turned on until the thin-
set cement has fully dried. A minimum of seven (7) days is
recommended.

Copyright 2009 Danfoss Inc.

088L3380 - 06/09

Step 7. CONNECT POWER SUPPLY AND
THERMOSTAT

(See Appendix A)

The connection of the power supply and the LXstat GFCI
thermostat must be done by a qualified electrician in
accordance with the National Electrical Code (NEC) and
the Canadian Electrical Code (CEC). The electrician
should also feed the sensor cable into the installed conduit
and connect it to the thermostat.

TEL: [phone]. FAX: [phone]

7