This applies to the UH4, UH8 and UH6 wiring centres
The LS and LR are volt free switches, meaning whatever voltage is put into LS will come out of LR to trigger your heat source
- LS means live supply if you put 240v into LS, then 240v will come out of LR, as another example, if you put 12v onto LS then 12v will come out of LR
- LR is the switch live return back to operate your system.
- These connections are electrically isolated from the main board to prevent back feed.