Function selector guide
Please note that the function selector must not be lubricated on site – it requires a special lubrication
04/11/2019 00:00:00
Function selector FFF-version
Most damages to function selectors are caused by back-flow of chemicals or water – this can be caused by:
1. Defect non-return valve(s) for chemical
Check non-return valve by dismounting the suction hose on the needle valve. If water appears the non-return valve is defect (water inlet to the unit must be open).
Change non-return valve.
Non-return valve with Viton o-rings: 20-200111 // With EPDM o-rings: 20-000110
2. Defect chemical valve(s)
Chemical valve 20-000830: Change the valve
Chemical valve 20-000810 and 20-000800: Control valve by disassembling the valve and check if o-rings and cone point are damaged. If yes, spare kit is available: Viton o-ring: 20-000811, EPDM o-ring: 20-000801. If no, replace by 20-000830
To prevent failure of the chemical valve and non-return valve, make sure to flush the injector system with water after using chemicals.
Exchanging function selector
When exchanging the function selector, please note:
- Control the function of the non-return valve(s) and the chemical valve(s). Replace if necessary.
- Air hoses between function selector and chemical valve must be flushed with clean water or replaced by new.