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1.5 Preliminary Electrical Installation
Circuit
Floor heating systems should be connected to electrical circuits dedicated to heating. The amperage
drawn by the cable sets, as indicated on the cable labels, will determine the required circuit intensity.
Please take note that the maximum load that can be supported by the True Comfort thermostat is 15 A. For
a load greater than 15 A, a system with an expansion unit or a relay is required. A True Comfort thermostat
can control up to 10 expansion units.
Electrical connection box
Determine where the thermostat connection box will be installed. It should be in an accessible location
in the room where the system will be installed and at an appropriate height.
Use an expanded connection box or a 4 in x 4 in box with knockout holes for conduits for the system
connection (plan one connection box for each 15 A circuit).
Conduit
A conduit approved for electrical wiring, inside which the black cold lead will be inserted, must be installed
between the electrical box and the floor.
• Unless approved for this application, electrical metallic conduits are not allowed in wet environments
(ex.: shower).
• PVC conduits are allowed only in walls that do not contain thermal insulation.
• The ends of the conduit must be deburred and bushings must be installed to protect the cable against
any mechanical damage.
• Conduits must be adequately secured.
Fish cord
Before installing the gyproc, install a temporary fish cord in the wall, between the floor and the electrical
box. When installing the probe on the floor, use this cord to pull the probe wire to the thermostat. The probe
wire must be run outside the conduit containing the cold lead, outside the electrical box and be inserted
in the opening provided for this purpose on the thermostat's base.
IMPORTANT NOTE: The thermostat must be installed no closer than 1 metre (39 in) from any wet zone (shower,
sauna, indoor pool apron). A separate cable must be installed in a shower.
1.6 Important installation guidelines
Certain distances must be respected when installing the cable in the following situations:
• No closer than 5 cm (2 in) from the base of fixed furniture, steps leading to a bath, baths or showers.
• No closer than 5 cm (2 in) from a wall.
• No closer than 20 cm (8 in) from an electrical outlet on the floor.
• No closer than 10.1 cm (4 in) from a non-heated conduit or drain.
• For distances from a toilet, see the Bathroom Example on page 8.
• The spacing between the cable runs must remain unchanged throughout the installation and must
never be smaller than 7.6 cm (3 in) or larger than 10.1 cm (4 in) if installed in an uncoupling membrane;
the cable must be installed at a regular spacing of 7.6 cm (3 in) or 10.1 cm (4 in) if installed with gauges
or the FLEXSnap + system.
• Cables must be installed in runs of less than 3 m (10 ft) long. Divide the room in smaller sections if it
exceeds 3 m (10 ft).
• The uncoupling membrane, gauges or FLEXSnap + must be installed before inserting the cable
according to the product manufacturer's instructions.
The cable cannot be cut, crossed, shortened, or overlapped.
IMPORTANT NOTE : To insert the cable into the membrane, use a non-cutting tool such as a wooden trowel. The
cable must be installed at least 13 mm (1/2 in) away from any exposed combustible surface.
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