19
MORE PAD INDOOR
•
Determine the peak demand, in W, of the room to be heated;
•
Calculate the development in metres of PAD INDOOR as a function of the W/m yield; increase the development by
at least 30% to take into account the share of energy dispersed towards the separation insulation with the building
envelope.
•
Choose the type of installation (floor, wall, ceiling) and, depending on the surface available, determine the number
of strips of PAD OUTDOOR to be laid; it is advisable to keep the distance between one mat and the next between
25 and 250 mm; if the surface finish is to be fixed mechanically (e.g. plasterboard or parquet strips), preferably lay
the mat at right angles to the direction of fixing of the finish itself.
•
Determine the peak electrical power by multiplying the total development in metres of PAD OUTDOOR by the
nominal electrical power absorbed at 10°C;
•
To determine the number of power supplies required to drive the system, divide the total electrical power
determined in point 4) by the electrical power that can be delivered by the drivers available from the system
accessories.
•
For the correct choice of power supply driver, it is advisable that the electrical power that can be supplied is at
least 90% of the maximum electrical power that can be supplied by the driver. For example, the 1000 W driver can
supply 900 W of PAD INDOOR;
•
If the PAD is to supply power to wet areas that can be classified as special environments, it is necessary to use only
power supply drivers capable of raising the protection of the electrical system to SELV (Safety Extra Low Voltage);
•
Determine the installation position of the driver in order to proceed with the dimensioning of the extra-low voltage
power lines; the cable route must be as short as possible in order to limit voltage drop as much as possible.
•
For the DC extra-low voltage line, provide one or more distribution backbones for connecting, in parallel, the
36VDC output of the power supply driver to the junction boxes to be located near the PAD INDOOR mats to be
powered;
•
Each junction box must contain a distribution manifold from which the power cord of each mat is derived. Each
cord shall feed a length of PAD INDOOR not exceeding 7 metres.
•
The maximum voltage drop recommended by IEC 64/8 is 4 % from the point of delivery to the last consumer,
normally divided into 1.5 % for the line from the measuring instrument (meter) and 2.5 % for the internal electrical
distribution;
•
For the 36VDC extra-low voltage line downstream of the distribution drivers, it is preferable to dimension the line so
that the total voltage drop of the line does not exceed 0.5 VDC. However, it is possible to correct the output voltage
of the driver within the range given in the technical characteristics section.
•
The following tables can be used for an initial awareness of power line dimensioning:
Information for electrical dimensioning:
For dimensioning, proceed in the following logical sequence:
Warning
This sizing method is intended to provide rapid sensitivity on the necessary heating amount
to meet the peak thermal requirements of the environment. This method does not replace
the thermo-technical calculation, which must consider the emission value towards the
environment as well as the limitation constituted by the thermal resistance of the finishing
element.
power W
power matching the size of the
driver
cable length
m
cable cross section mm2
unipolar type
H07V-K or FS17 450/750V
600
5
6
600
10
10
600
15
16
600
20
16
1000
5
10
1000
10
16
1000
15
25
