It is the function to set the start and end time of the outdoor unit’s low noise mode operation.

It is the function to control remotely through network with indoor unit.

If you choose air+water temperature control way, this option is listed up on function setting display. It is the function to set upper limit of water temperature while controlling the unit based on room air temperature.

It is the function to linkage the 3rd party boiler. (This function can be activated, after setting every value in installer mode.)