- Easier than mats to install in confined spaces or areas with multiple obstacles
- Spacing between cable loops determines the wattage per m2
- Can be installed in bathroom or shower room
- Kits provide total solution with thermostat, Vysa-bond PVA primer, a paint roller, strong adhesive tape and cable
Vysa-Cable Cable Kits
Vysa-Cable Classic is ideal for refurbishment projects in existing dwellings or in new-build extension projects, either as direct floor heating or as floor storage heating.
There is no need to remove existing ceramic floor tiles – you can install the Vysa-Cable Classic heating cables directly on top of the existing tiles and then tile over them as normal.
The cable is rated at 10W per metre and depending on how it is spaced when being installed, you can achieve ratings of 130, 160 or 200W/m2. We can advise you on spacing when we quote for a project once you have indicated the materials of the floor and sub-floor and whether it is primary or secondary heating that is required.
Vysa-Cable Classic can be installed within the thickness of the tile adhesives and therefore adds no significant height to the floor level. Consequently, there should be no requirement to reduce door heights, raise skirting boards etc.
Vysa-Cable Classic is versatile because you can choose a cable spacing to provide the appropriate power rating and, they suit rooms with irregular floor areas where a heating mat might be awkward to lay.
The popular Vysa-Cable Classic Cable Kits contain everything that a DIY enthusiast would need in one carton.
1. Vysa-Cable Classic heating cable
2. Vysa-Therm 3000 thermostat (can be upgraded to a Touch Screen model on request against an extra payment)
3. Floor temperature sensor
4. Conduit for the floor sensor
5. Vysa-Bond PVA floor primer
6. Paint roller to apply primer
7. Vysa-Bond adhesive tape
Naturally, Vysa-Cable Classic is a twin conductor design with a single 3 metre long ‘cold tail’ connections lead (only one connection cable to the thermostat).
Note – Do not exceed 130W/m2 for wooden subfloors – unless you fit Vysa-Pron thermal insulation.
Installation into wet areas
Vysa-Cable Classic heating cables have an earthed metallic sheath beneath their outer jacket.
They fully comply with the requirements of Section 701.753 of the IEE wiring regulations BS 7671:2008 so may be embedded in the floor below any zone of the bathroom or shower room. The Vysa-Cable is approved to IEC 60800.
How many W/sq m are needed? The specification / construction determine the heat loss of the room or dwelling. To maintain equilibrium the energy input must balance the heat lost. Electricity consumption is not governed by the W/sq m rating but by the thermostat and how it is programmed to control the underfloor heating system. The Vysa-Therm 3000 thermostat supplied with this kit comes pre-set with an energy efficient programme that, according to our experience, suits 95% of all applications.
If you have heat loss data, you can simply choose a kit with the power rating that you need and then lay the heating cable at a cable spacing that will enable the whole length of cable to be used evenly across the floor area. If the cable spacing data in the table above doesn’t suit your application, you can easily calculate the cable spacing required.
Don’t worry if you don’t have heat loss data! You can simply choose a suitable W/m2 rating and read off the appropriate VCK Cable Kit for your particular requirement from the table above. 150W/m2 is generally suitable for most primary heating requirements but in well or very well insulated dwellings to the latest design specifications 130W/m2 or even less can be suitable. 200W/m2 is generally suitable for most primary heating requirements in bathrooms and areas of higher heat loss such as conservatories and other similar constructions.
If in doubt, use a greater value of W/m2 rating. It is NOT the W/m2 that determines running costs but the thermostat setting and insulation provision.
|Order code cable kit||Order code cable kit LESS thermostat||Cable Length (m)||Nom. 130W/m2 cable spacing 7.7cm = room area m2||Nom. 150W/m2 cable spacing 6.7cm = room area m2||Nom. 200W/m2 cable spacing 5cm = room area m2||Total Wattage|
The entire floor should be swept clean and be free of any sharp objects. If required the floor can be primed using Vysa-Bond Primer(follow tiling adhesive manufacturers recommendations)
Check the cable resistance using an Ohmmeter and compare against the value marked on the cold tail label.
Lay the cable to the calculated spacing and fix using adhesive tape.
Do not remove the cable from the drum before laying as it will twist and make installation difficult.
The heating cable must not touch and should never cross.
The heating cable must not be cut or shortened and the joint between the cold tail and the heating cable must not be bent or put under strain.
The floor sensor for the thermostat should be positioned between 2 heating cables approximately 500mm from the wall. The conduit provided should always be used to install the floor sensor. Before and after covering the heating cable with tile adhesive/self-levelling compound, the cable resistance should be checked against the label value. When using tile adhesive it is important to ensure the cable is totally encapsulated. Avoid traffic over the areas until the cable is completely protected.
A fully qualified electrician must now make the final connections to the mains supply and install the thermostat. The thermostat should be installed in the room to be heated. Finally the electrician should check for continuity of the floor sensor and retest the resistance of the cable. A further insulation test should be carried out in accordance with IEE regulations.
The installation must be protected by a 30mA RCD for safe operation.
Consult the adhesive manufacturers’ instructions to determine the required drying out period before turning on the system.
Q. Why can I not cut the cable?
A. Specific cable lengths have been adapted to provide the correct resistance value and therefore the appropriate heat output in W/lin metre. If the cable is cut or shortened, the resistance will be changed and therefore the designed power output will be changed.
Q. What if the heating mat/cable is too long?
A. The most crucial part of an underfloor heating installation is the design. Always accurately measure the effective floor area that you want heated and choose the nearest mat size down after subtracting a 10% perimeter allowance. Before installing the mat or cable check the size against the floor. If the mat/cable is obviously too long – Stop. At this stage it is best to return the product for exchange for the correct size as you cannot cut the cable. A small oversize maybe dealt with by reducing the cable spacing but any reduction will have an effect on the heat output (W/m²). Do not cross the heating cable and make sure that the minimum cable spacing distance is 50mm.
Q. Will my cable mat provide Primary Heating.
A. If you are considering using underfloor heating as the sole source of heating in your room you need to ensure that you allow for sufficient heat input to cover the heat losses. We recommend that you consult your architect or heating engineer to provide heat loss calculations. As a guide however, if your room complies with the insulation standards in the current building regulations, Vysa-Mat Classic 150 or 200 watts/m² cable mats can be used as a primary heating source. Rooms with potentially high heat losses such as conservatories may require a supplementary heat source on very cold days.
For your information, mats with higher heat outputs per square metre, do not mean that they will use more energy to run. Heat input is controlled by the thermostat. Rather they provide quicker warm-up times.
Q. Would I be best with a Cable Kit or Cable Mat.
A. Loose cable is ideal for installations involving intricate and irregular room designs as the cable provides maximum installation flexibility. In addition cable spacing can be varied to provide more output in designated high use areas around basins and sinks. Heating mats have a set width for installation in regular shaped rooms where they are very quick and easy to lay and provide a regular and even heat output.
Q. Can I heat a wooden floor using a cable mat?
A. Yes you can do this but it is not the best solution. We would recommend the use of Vysa-Film underfloor heating element for heating laminate of timber floors. Vysa-Film elements provide a simple dry installation method and is ideal for all floating wood floor installations. It is ultra thin and provides minimal floor height build-up.
If you must use a cable mat for heating under a wooden floor it must be covered with a minimum layer of 10mm of floor self-levelling compound over the top of the heating cable. This layer acts as a heat dispersion medium so that the heat from the cable is evenly dispersed throughout the surface it reaches the wood or laminate floor covering.
Q. Can I use my Floor Heating immediately after installation?
A. NO. You need to give the installation adhesives time to dry out. Consult the information provided by the tile adhesive and/or self-levelling compound manufacturer used in your installation for recommended drying times. Premature use of the underfloor heating to cause accelerated drying of the adhesive can cause micro cracking of the material which could be detrimental to its long term performance.
Q. Can I join 2 mats together?
A. Heating mats or cables can be joined together in parallel via a junction box to the control thermostat. Be careful not to exceed the rating of the thermostat (TH132AF which is 3450 watts). If this rating is exceeded a suitably rated contactor needs to be used in conjunction with the thermostat.
Q. Can I tile directly on top of my cable or cable mat installation?
A. Yes you can. There are 2 recommended methods for covering the cable.
The first is to apply flexible tile adhesive on top of the mat or cable so that it is completely covered, ensuring that there are no air pockets. This should be done using a rubber backed trowel or similar taking care not to damage the cable. Another layer of adhesive can then be applied using a traditional notched trowel to comb the adhesive before laying the tiles.
An alternative method for all but the smallest installation is to cover the cable/cable mat installation with a suitable latex self-levelling compound. This product will find its own level and once dry will provide a suitable flat surface to apply a layer of flexible tile adhesive before laying the tiles.