Danfoss Electric Heating Cable 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 Cable
Manuel d'installation
Câble chauffant électrique
Manual de instalación
Cable de calefacción eléctrica
Table of Contents
Danfoss LX Floor Heating System .............................................................................................................................................................................................. 2
LX Cable Specifications .................................................................................................................................................................................................................. 2
Typical Installations and Cautions ............................................................................................................................................................................................. 3
General Installation Guidelines ................................................................................................................................................................................................... 4
Warranty .............................................................................................................................................................................................................................................. 9
APPENDIX A: Typical Electrical Wiring........................................................................................................................................................................................ 26
Système de chauffage de plancher Danfoss LX .... .................................................................................................. 10
Spécifications relatives aux câbles LX ....................................................................................................................................................................................... 10
Installations typiques et avertissements .................................................................................................................................................................................. 11
Directives générales d'installation .............................................................................................................................................................................................. 12
Garantie................................................................................................................................................................................................................................................. 17
ANNEXE A: Câblage Électrique Typique.................................................................................................................................................................................... 26
Sistema de calefacción por suelo radiante Danfoss LX...
Especificaciones del cable LX........................................................................................................................................................................................................ 18
Instalaciones y precauciones típicas.......................................................................................................................................................................................... 19
...............................................................
..................................................................................................................................................... 18
Pautas generales de instalación................................................................................................................................................................................................... 20
Garantía................................................................................................................................................................................................................................................. 25
APÉNDICE A: Cableado Eléctrico Típico..................................................................................................................................................................................... 26
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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 cable 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 Cable Specifications
Type:
Voltage:
Output:
Heating Element Size:
Cold Lead
Bending radius:
Cable Diameter:
Wire insulation:
Casing:
Max. Allowable Temp.:
Min. Installation Temp.:
Note: Operating the 240V cable at 208V reduces the power output to approximately
2.25W/sq.ft. (25% reduction)
Twin conductor
120V, 240V
3W/ft (10 W/m)
40’ (12.2 m) to 630’ (192 m)
10’ (3.0 m)
Minimum 3/4” (19 mm)
1/8” (3.2 mm)
FEP, Teflon
PVC
212°F (100°C)
50°F (10°C)
TM
WARNING:
Remember to measure resistance.
Little Buzzer
Connection 120V
Phase - Black (L)
Neutral - Blue (N)
Ground - Bare
Connection 240V
Phase - Black (L1)
Phase - Blue (L2)
Ground - Bare
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 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.
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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
a
r
he
T
most
t sensor
Concrete
Warning:
Consult the manufacturer for information on special
installation requirements for wood, laminate and
vinyl or linoleum flooring.
Caution!
Ÿ Read the instructions carefully before installing
LX cable.
Ÿ Do not install LX cable in walls or ceilings;
Ÿ The cable must be embedded in mortar,
thinset, concrete or similar material;
Ÿ The minimum installation temperature is
Ÿ 50°F (10°C);
Ÿ Never cut the red heating wire;
Ÿ It is recommended to use copper wire only;
Ÿ Never install the LX cable such that two red
heating wires touch, cross or overlap;
Ÿ Also, measure the resistance between the blue,
black and shielding/ground wire. Both should
read infinity.
Ÿ Remember to always measure, verify and
record the actual resistance throughout the
installation process (out of the box, after
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.
Ÿ Remember to check that the supply voltage
matches the voltage of the LX cable;
Ÿ Remember to place the labels as written in
this instruction;
Ÿ Only for indoor installation;
Ÿ Metal structures or materials used for the
support of or on which the Danfoss LX cable is
installed must be grounded in accordance
with CSA Standard C22.1, section 10 and
the NEC.
Please consult the factory for any other questions
or advice.
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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
area an d t he posit io n of t he LX th ermostat.
TIP: Danfoss recommends that the 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 cable. The
starting point of the cable must be placed within 10 ft.
from the thermostat. Using your floor plan determine
your desired spacing of cable (standard 3” c-c) and
strapping (recommended 2’-3’ apart). Note: minimum
distance between the cables must be 1” or greater.
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.
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3A
Step 3. INSTALL SENSOR
(recommended in conduit, part#19809099- not 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 approximately 5/16” deep x 5/16”
wide in the floor and wall up to the thermostat for 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.
4
4
IMPORTANT: the sensor conduit must be centered in
the cable loop (between two red heating wires).
Use duct tape to close the end of the conduit so that thinset
can't penetrate 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.
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.
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Step 5. MEASURE THE RESISTANCE
Use a digital ohm meter to measure the resistance of
the LX cable and compare it to the resistance listed on
the product label. Record the measured resistance
on the warranty card. Documenting the resistance at
each stage of installation is required for warranty
purposes. Also, measure the resistance between the
blue, black and shielding/ground wire. Both should read
infinity.
5
6
Step 6. BEGIN LAYING THE LX CABLE
Place the cable so that the connection point and the
temperature sensor are in their intended positions and
bring the power lead cable to the thermostat or
connection box.
Begin laying the LX cable according to the layout
developed in Step 1.
DO NOT CUT OR SHORTEN THE RED HEATING CABLE!
Do not expose it to any mechanical stress. Avoid walking
on the heating cable. Wear only shoes with soft soles. Use
Danfoss LX strapping to secure the cable to the subfloor.
Attach the LX strapping with adhesive, nails, staples, or
double-sided tape. Please refer to pg. 7 for instructions on
how to use the Danfoss LX strapping.
Measure and record the resistance on the warranty card.
Compare to the nominal resistance value on the product
label. (Due to product tolerance this can vary -5/+10%).
It is highly recommend to take photographs of the
installed LX cable before installing the flooring.
ENSURE THAT THE SENSOR CONDUIT HAS BEEN PROPERLY
INSTALLED BEFORE PROCEEDING (refer to pg. 5).
For tiling applications, proceed with the installation of the
tiles by covering the heating cables with a layer of thinset
cement as directed by the tile manufacturer. Ensure that
the thinset mortar covers the entire heating cable as the
tiles are installed.
For engineered wood or laminate floor coverings, it is
recommended to consult the flooring manufacturer for
maximum temperature allowance (use a thermostat with
a floor temperature limiter (i.e. LX thermostat 088L3032).
Ensure that all moisture in the self-leveling cement has
been fully eliminated in accordance with the drying times
recommended by the cement manufacturer (consult the
manufacturer for exact drying time).
Once the thin-set cement has dried, measure the cable
resistance and record it on the warranty card (due to
product tolerances the size can vary +/- 2% and the
resistance -5/+10%.). The system must not be turned on
until the thinset cement has fully dried. A minimum of
seven (7) days is recommended.
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Step 7. DANFOSS LX STRAPPING INSTRUCTIONS
Space the strapping at a distance of 2’ to 3’ (maximum recommended spacing is 3 feet).
Secure the strapping to the subfloor with adhesive, staples, nails, or double-sided tape.
Standard cable spacing is 3” c-c.
1 5
2 6
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3 7
4 8
7
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