Why are there four inputs for zones 1 and 2 of the wired valve control module?

The RadianT system for underfloor heating and cooling can control up to 10 wired thermostatic heads, distributed as follows:

  • Two heads in zone 1. The leftmost connectors on the first connection block.
  • Two heads in zone 2. The rightmost connectors of the first connection block.
  • One head for zones 3 to 8. All are located on the connector of the second connection block.