The Z11S backwash unit enables automatic initiation of backwash for all Honeywell filters that include this function. The unit allows the setting of backwash initiation at 16 time intervals ranging from 4 minutes to 3 months. The Z11S unit includes a safety feature in case of power failure (only with connected batteries) and allows manual initiation of backwash. Cables with signals from a differential pressure switch, remote control, or monitoring can be connected to the unit.

For Honeywell F76S backwash filters and filtration stations (threaded version), HS10S, F74CS, and FK74CS 1 1/2"-2".

Four alkaline batteries of type LR6-1.5 V-Mignon/AA (batteries not supplied as standard), with the option to set backwash from 4 minutes to 3 months

• Button for easy setting of backwash intervals

• Separate button for manual initiation of backwash

• LED indication of the number of completed cycles

• LED display for showing the set interval

• In case of power failure, backwash is automatically completed thanks to auxiliary batteries