Med intervalskyl skylles der ud regelmæssigt, hvis drikkevandsinstallationen ikke er i brug eller kun bruges begrænset. Der er ikke noget fikseret skylletidspunkt. Det gør det muligt at leve op til kravene til regelmæssig udskiftning af vand i overensstemmelse med DIN EN 806-5 and VDI/DVGW 6023-1.

1. billede: Ved intervalskyl skylles der med regelmæssige intervaller.
2. billede: Eksempel på rør ved en intervalstyret indbygningscisterne med hygiejneskylsenhed.

The time-based flush starts at fixed times. It starts at a specified time of day (e.g. 6:00 p.m.), combined with one or more days of the week (e.g. Tuesday, Thursday and Sunday). When actuated, the flush lasts for a specified, adjustable flush time.

1. Image: Example of piping of an interval-controlled hygiene flush unit with two classrooms, WC and technical room
2. Image: Example of piping of a time-controlled hygiene flush unit

Flushing the pipes in rooms where water temperatures reach the critical range due to the use of the room. In this operating mode, the flush starts when a particular temperature is reached (e.g. standard specification for PWC max. 25°C). The flush ends either when a stop temperature is reached or after a maximum predetermined flush time.

If the specified temperature is not exceeded within a predetermined time frame, the control actuates a routine flush. The routine flush is interval-based. The enable time can be used to set a time frame during which the hygiene flush unit should not actuate a flushing process (e.g. from 10:00 p.m. to 8:00 a.m. in hotels).

Figure 1: Example of piping of a temperature-controlled hygiene flush unit using the example of a service connection room and a plant room with a room temperature >25°C.
Figure 2: Example of piping of a temperature-controlled concealed cistern with hygiene flush unit and using a temperature sensor.