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Warm Tiles
SetLength of heating coil (m)Power
Floor Surface (Distance between coil loops 8-12cm)
WT 2182751,5 to 2mē
WT 4375503 to 4mē
WT 7619205 to 7mē
WT 97311006 to 9mē
WT 139516009 to 13mē
WT 18140220012 to 18mē
WT 28140 + 73330019 to 28mē

Before you start installing the electric floor heating, you should first read through this manual completely.

General points of attention
Bush Nelson Warm Tiles is designed to function as comfort electric floor heating. It will usually be necessary to have an additional heating source in the room you want to heat.

Before you start installing, you should make sure that the heating cable is suitable for the surface to be heated. Firstly, you have to estimate the surface area of the room; this is the area you want heated and does not include, for example, the space under the shower, under kitchen cupboards etc. Secondly, you have to estimate the distance between the coils in the cable. To do this, look up the capacity of the cable on the label and calculate the distance using the formula below:

Distance between coils = 1500 x surface area in m²
the output of the heating cable in W

The distance can vary from 6 to 12 centimetres. The smaller the distance (minimum 6cm) the faster your floor will heat up. A large distance between coils (larger than 12cm) combined with a low floor height increases the chance of cold and warm spots in the floor.

1) Cutting a groove in the floor for PVC pipes
To keep the floor height as low as possible, you can cut out a groove of approximately 1cm deep in the places where the PVC pipes for the floor sensor and the connection cable have to be laid.

2) Priming the subfloor
The cement subfloor needs to be primed with a suitable primer so it will bond properly with the screed. This primer also helps prevent the forming of air bubbles and water being extracted too quickly when levelling with the self-levelling floor screed. Follow the manufacturer's instructions.

3) Placing the mounting strip
The Easy Heat mounting strips should be laid in grooves cut into the subfloor. The distance between the strips and the wall should be 20cm. The distance between the mounting strips is 40 to 50cm. Nail or screw the strip into position.

4) Placing the heating cable
The heating cable should be laid on the mounting strips in a zigzag pattern. You can calculate the correct distance between the coils in the cable using the formula provided. You should start laying the cable where the PVC pipe comes out of the wall. At the end of the cable, you simply stop, you do not have to return the end to the connection point (the PVC pipe).
The floor sensor of the thermostat is place in a PVC tube between the heating cables. The distance from the wall to the sensor is a minimum of 50cm.
N.B. Be sure to seal off the open end of the PVC tube with tape so that the sensor does not come into contact with the self-levelling floor screed.

5) Check cable
Do not lay the heating cable in places where the floor will subsequently have to be drilled (for example when placing a toilet).
The heating cable may not cross over itself or be shortened. If you have any cable over, you should reduce the distance between the coils (minimum 5cm). You can test the cable to make sure it works properly by connecting it directly to the main electricity (230 VAC).
After a few minutes, the cable should feel warm to touch. Take care! The cable has to be completely laid before you do this.

6) Levelling
The cable must be covered by a cementious material such as a self-levelling floor screed. The screed has to have a minimum thickness of 6mm. Follow the manufacturer's instruction for levelling the floor.

7) Tiling
After the screed has hardened, you can tile the floor using tile adhesive and jointing mortar suitable for floor heating. Follow the manufacturer's instructions.

8) Electrical wiring
The electrical installation must always comply with locally applicable standards and be carried out by a recognised installer.

9) Connecting the thermostat
Connect the cable(s), floor sensor and wiring to the thermostat as shown in the wiring diagram. Follow instructions in the thermostat installation manual.

10) Self -learning thermostat
Warm Tiles kits WT2, WT4, WT7, WT9, WT13 and WT18 are controlled by an F10-C programmable controller.
Programming info for F10-C controller

Warm Tile kit WT28 is controlled by an F17C programmable controller
Programming info for F17-C controller