Cable sectional area selection to use with Mycond thermostats

Mycond thermostats for underfloor heating operate with a load of up to 16 A (~ 3.5 kW), so we recommend to use a copper cable with a minimum sectional area of 1 mm2, and preferably 1.5 mm². If you use aluminum cable, then it should be at least 2 mm².
We recommend that you power the thermostat directly from the electrical panel through the individual circuit breaker. And then connect the underfloor heating circuit to the thermostat. For both of these connections you will need the 2-wire (L, N) cable.
 

Usually fan coil motors have low power consumption. That's why thermostat have relays with an operating current of only 3A (~ 660W). A sectional area of 1mm² for a copper cable or 2mm² for an aluminum cable will be sufficient in this case.
We recommend that you power the thermostat directly from the electrical panel through the individual circuit breaker, using 3-wire cable (L, N, PE). The fan coil unit with a multi-speed motor must be connected to the thermostat using a cable with the appropriate number of wires. For example, if we have a 2-pipe system and 3 fan speeds, then we need to use a 6-wire cable (low-speed L, med-speed L, hi-speed L, valve L, N, PE). In case of 4-pipe system and 3 fan speeds we need to use a 7-wire cable (low-speed L, med-speed L, hi-speed L, C-valve L, H-valve L, N, PE).
 

Typically, hygrostats use indirect control using a low current signal. A sectional area of 0.75…1mm² for a copper cable or 1mm² for an aluminum cable will be sufficient in this case.

P.S. Follow this link to find easy online sectional area calculator: https://best-energy.com.ua/support/calc-cable