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General guidelines about mortars and self-leveling
underlayments
Uncoupling membranes can only be installed using
mortar, while gauges and FLEXSnap+ can be installed
using mortar or a self-leveling underlayment. Whatever
the selected technique, the heating portion of the
cable, as well as the mechanical joint and floor probe,
must be completely embedded in the mortar or self-
leveling underlayment.
WARNING :The floor covering must be in direct
contact with the mortar in which is embedded the
heating cable. Make sure there is an adequate
transfer of mortar according to current standards.
WARNING : When mortar is used, never hit the trowel
on the heating cable to remove excess mortar from
the trowel: cables could be damaged. Use a sponge
or a wet cloth to remove excess mortar as you lay
the tile: do not use a utility knife or the edge of your
trowel. These tools could damage the heating cable.
During all operations, lay tools and materials (buckets,
etc.) on a piece of cardboard instead of directly on
the cables.
Floor covering installation
(with an uncoupling membrane or FLEXSnap + )
See FLEXSnap + or the membrane manufacturer's
recommendations for the types of compatible mortars
as well as instructions on the floor covering installation.
Floor covering installation (with gauges)
1. Polymer-modified mortar glazing technique –
Ceramic or natural stone flooring
This technique involves glazing the cables with the
same type of mortar that will be used for the floor
covering. A thin layer of polymer-modified mortar is
spread over the cable (in the same direction as the
wire) with a flat trowel. Pull the trowel at a 45° angle
using a little pressure. Spread the mortar in a way that
the space between the cables is completely filled. It
is not necessary to fully cover the gauges.
Once the glaze is set, proceed with laying the tile as
per the manufacturer's recommendations.
2.
Polymer-modified self-leveling underlayment glazing
technique – All types of flooring
Make sure that gauges are secured to the floor surface
and that cables are stabilized at 1 m (3ft) intervals
to prevent them from floating when the selfleveler is
applied.
Using a smooth scraper, spread a thin layer of self-
leveling underlayment. Once the underlayment is
set, proceed with laying the floor covering as per the
manufacturer's recommendations.
Cable verification
Once the floor covering installation is complete, verify
the cable's integrity one more time, as described in the
"Cable Verification" section at the beginning of this
guide. Record the results on the warranty card.
Connection to the thermostat
DANGER : SEVERE RISK OF ELECTROCUTION. Turn off
the power of the designated electrical circuit prior to
connecting the system controls.
Thermostat to use
Use a True Comfort thermostat to operate the system.
These thermostats are equipped with a class A ground
fault circuit interrupter (GFCI) that will protect the system
in case of fault. To preserve the system's warranty the
use of a thermostat equipped with a class A GFCI (5
mA) is required.
Single-circuit installations
Connect the system's green wire (ground) to the
terminal in the connection box. Proceed as per the
instructions in the True Comfort thermostat installation
manual. Identify the circuit on the electrical panel.
Complete and apply the warning label.
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