Winter/Summer (up to firmware version 1.2.7)

The cooling via a summer bypass or brine EHE is deactivated/disabled. External preheating or supplementary heating is enabled.

Outside air preheating (frost protection) can be ensured using a preheating register and/or an optional brine EHE. Depending on unit type, a preheating register may already be installed.

The cooling via the brine EHE or summer bypass is enabled. An external supplementary heating is disabled.