Connecting Your Foil Heating System
Bring the lead(s) back to the thermostat and connect according to the manual. When setting up your 3IE thermostat, make sure to select the correct flooring surface. This will guarantee your system will never exceed 81 degrees F. Warmup has tested the Foil system with many flooring manufacturers and has worked with them to determine safe operational levels.
When installing over a concrete slab Warmup recommends using the soft insulation they provide which will reflect the heat back into the floor.
If you absolutely need to extend the unheated lead that is connected to your thermostat, you will need to ensure that you have the proper gauge wire when splicing. A 20 amp circuit will use 12 gauge and a 15 amp circuit will use 14 gauge.
If you have more than one heating system, all the lead wires need to be connected in parallel to the thermostat. In this instance, it might be more convenient to run multiple lead wires to a junction box, and then a single wire (which has the appropriate rating) from the junction box to the thermostat.