Strong backup functions
When unit is failed: If one slave unit fails, failed unit will stop but the others will keep running.
If master unit fails, all the units will stop but any of the slave one can be set as the master unit by manual setting in a very short time. When unit is under protection: If master unit’s protection happens, protected unit will stop but the others will keep running.
If slave unit’s protection happens, protected unit will stop but the others will keep running.
Except PE, P9 protection happens (PE: Low temperature protection of evaporator / P9: Outlet and inlet water temperature difference protection).