WarmlyYours Snow Melting & Slab Heating - Manual (Page 4)

4.0 INSTALLATION FOR INDOOR & OUTDOOR SLAB HEATING
4.1 TEMPERATURE CONTROLLER & SENSOR
We recommend a standard Programmable Thermostat with a temperature sensor
specially designed for control of the Heating System.
The sensor normally comes with a lead wire of 15 feet (4.5m) in length. Thermostat
sensor location shall be centered between two adjacent runs of Heating Cable within
metal pipe or conduit to allow for replacement. Do not position Thermostat sensor
closer than 1.5 inch (38 mm) to Heating Cable. Sensor cable shall be routed to the
Thermostat located in the wall at suitable operating height. Always install Thermostat
indoors, even when used in conjunction with exterior slab heating.
Do not allow any other Heating Cable to overlap with the sensor cable.
The details of the thermostats and installation guidelines are given in the instruction
manual provided with the Thermostat.
4.2 ELECTRICAL PROVISIONS FOR THE SYSTEMS
The Heating System installation wiring shall be in accordance with the National Electric
Code and any applicable local codes. Controls and accessories recommended for
use along with the Heating Cables are listed below:
• Floor Sensing Temperature controller / Thermostat
• GFCI (Ground Fault Circuit Interrupter)
• Dedicate Circuit Breaker(s) for all heater circuits
• Plastic or wire zip ties
The location of the Thermostat junction box shall be about 4’ (1.2m) high from the
floor for easy access. The floor sensor wire and the Heating Cable cold leads shall be
routed to the Thermostat / power connection box in separate conduits.
If the Heating System has a load below 1,750W at 120V or 3,500W at 240V based
on thermostat power rating, it may be connected directly to an electronic thermostat
as shown in Diagram A which gives a typical scheme of the electrical system. If the
Heating System has a load more than the thermostat power rating, consult your
WarmlyYours Account Manager.
WARNING
Heating Cable should be connected to a Ground Fault Circuit Interrupter (GFCI)
equivalent having a rated residual operating current not exceeding 30mA. Consult a
qualified electrician.
In case the GFCI trips during normal operation, and cannot be reset, there is likely a
fault in the Cable. No attempt should be made to re-energize the system. The GFCI
must not be bypassed under any circumstances. Consult a qualified electrician.
3
2’ (61cm)
or
3’ (91cm)
Length 5’ (152cm) min 50’ (1524cm) max
20’ (610cm) Cold Lead
Outer Sheath PVC/Pololefin
Polyester Sheath
Metal Sheath (Copper/Galvanised Steel/Cladded Steel)
Primary Insulation (Fluoropolymer)
Heating Conductor (Solid/Multistrand)
10"
(251mm)
3"
(8cm)
20’ (610cm)
Cold Lead
SENSOR HEATING
CABLE
FLOOR
1/4” (6mm)
Twin-conductor
Heating Cable
HEATING SYSTEM
THERMOSTAT
SNOW
SENSOR
SLAB TEMP HIGH
LIMIT SENSOR
SNOW MELT MAT
120 VAC SUPPLY
110V / 230V AC SUPPLY
120 VAC
or
240 VAC
RELAY
PANEL
CONTROL
PANEL
SENSOR HEATING
CABLE
FLOOR
SNOW MELT MAT
THERMOSTAT
P N E
DIAGRAM A