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Information and tips for installing Danfoss radiant flooring

For simplification in this blog, I will focus on using the Danfoss mats, which are a part of the Danfoss system, and how to install them under a tile floor. The pre-installed heating cable will greatly reduce installation time and are a preferred choice of contractors or “do it yourself” individuals since the cable is already formed onto a convenient roll that is two feet wide. This aids in simplification and insures there are no hot or cold spots under the tile floor. These Danfoss LX mats have a factory applied adhesive that will stick when applied to a clean wood subfloor. Below is a picture of the Danfoss mat system with thermostat.

It is important to fully understand the limitations of cable heating systems. For the most part, these cable under floor heating systems are installed under tile flooring. They can also be installed with self-levelers, cement products or a flooring types other than tile. For simplification purposes, I will focus on using the Danfoss LX mats under a tile floor.

Begin by first planning the layout of the Danfoss radiant floor heating mats. Make a sketch of the open floor area of the bathroom that you would like to provide radiant floor heating under. It is important to draw in the vanity, shower/tub areas, toilet and any other fixed objects. This will aid the designer in insuring adequate coverage of your radiant floor heating system. There is no need to plan for installing the mat underneath fixed objects, as this will just be a waste of time and money. Furthermore, cable systems should never be placed under fixed objects as this could lead to overheating and premature failure of the heating cable.

In addition, indicate on the drawing where you would like to install the Danfoss LX thermostat control. It is wise to avoid placing the thermostat near windows or other heat sources because these factors may influence the accuracy of the temperature. There are a couple of thermostats to select from. The thermostats are available in standard manual control or programmable set back type.

Another consideration that should be made involves the type of voltage you want to order your Danfoss system in. They are available in 120 or 240 VAC (volts alternating current) systems. The 240 VAC mats are most common on larger square foot applications. It is easy to get confused and believe a system will be more efficient with a 240 volts AC rather than 120 volts AC. This is simply not true as the watt density of the cable will be the same output at 12 watts per foot regardless of supply voltage. Check your electrical service panel to insure you have room to apply either the single pole 120 VAC breakers or a double pole 240 VAC breaker. If you are unsure, you may want to stop what you’re doing and hire an electrician! No matter what supply voltage you choose, it’s important to ensure you’re ordering a Danfoss LX mat that matches this supply voltage.

Submit the drawing to your sale representative and within one to three days they will provide you a quote for the Danfoss radiant floor heating materials. In my next blog we will talk about how to install the Danfoss electric radiant floor cable under tile. Stay tuned!