How to wire an nSpiration Series model thermostat to an electric floor heating roll

Now it's time to install the thermostat. When you take the thermostat out of the box, there are a few key components to look for. Inside the box, you will find the thermostat itself, which consists of two parts: the faceplate and the base. When you order a thermostat, both parts are included together; they cannot be ordered separately. Along with the thermostat, you'll also find the floor sensor, which should have already been installed during the flooring process. Additionally, the box contains the necessary instructions and screws for wall attachment.

The base of the thermostat will be installed into the wall, with the faceplate attached to the front once the base is secured. It's important to examine the blue terminal box on the back of the thermostat, as this is where you will make several critical connections. The two connections at the bottom are designated for the sensor wire, which will be installed into these bottom screws. The upper two connections are for wiring a separate power module that may be used in conjunction with this unit.

Turning the thermostat upside down allows you to access the back connections more easily. The wires labeled "line" are incoming from the circuit breaker, while those labeled "load" are intended for the floor connections. These wires should be trimmed to the appropriate length according to local code, which specifies that they must extend eight inches from the entrance of the box. After marking the eight-inch length, match the wires from the junction box to ensure they are all the same length.

At the back of the thermostat, you will notice that it operates on 240 volts without a ground. Since there is no polarity in the mat itself, you don't need to worry about which wire goes where; the double pole switch relay inside ensures that both legs are turned off, even in a 120-volt setup. Therefore, it is sufficient to connect the load wires from the floor to the load terminals on the back of the thermostat without concern for color coding.

Once the first wire is inserted under the terminal connector, proceed to insert the second wire. Be cautious to keep the metal bracket pushed out far enough to allow the wire to fit underneath. Ensure that all strands of the wire are secured under the metal bracket to avoid any stray strands that could potentially contact other wires. After inserting the wires, tighten the metal bracket down with the screw, ensuring no wire is protruding from the top.

Next, you will make the connections. Although there is no polarity in the mat, for neatness, you can place the red wire under one terminal and the black wire under the other. When securing the connection, ensure that the metal bracket does not compress the plastic insulation of the wire, as this could lead to an intermittent or poor connection. A small sliver of metal should be visible on one side before tightening the bracket down. After securing the connections, place the plastic cover back over the thermostat.

Before finalizing the installation, it's essential to test the thermostat sensor to confirm it is functioning correctly. The sensor should read between 8,000 and 18,000 ohms, depending on the room temperature. Set your digital ohmmeter to the 20k range for accurate readings. By connecting one wire to each terminal, you should obtain a reading that indicates the sensor is operational. Once confirmed, trim any excess wire length, ensuring compliance with local code, which requires eight inches of cable to remain exposed.

Now, loosen the screws for the sensor, which will be routed through the base and into the blue terminal strip. This wire, like the others, has no polarity, allowing either wire to connect to either terminal. Once the sensor wire is properly positioned, you are ready to install the thermostat base into the wall. With all wires connected at the base, align it according to the instructions and secure it using the supplied screws in the 4x4 thermostat box.

After snugging up the bottom screw slightly to allow for adjustment, ensure that the base is level before tightening the screws fully. Once the base is securely in place, you can attach the faceplate of the thermostat. Remember to tighten the set screw at the bottom to hold the faceplate in position. Remove the protective plastic covering from the screen, which is there to prevent fingerprints during installation.

With the power now on at the thermostat, you are ready to program it. Instructions for programming the thermostat will be provided in a subsequent video. Enjoy the warmth and comfort that your new floor heating system will bring to the room.