How do I set a Clack Valve to regenerate tonight?

You can set a time clock Clack valve to regenerate "tonight" by pressing the UP and DOWN buttons simultaneously. The arrow will point to Regen.

You can set a demand regeneration or metered Clack valve to regenerate at the preset time by pressing the REGEN button when the regeneration time option is set to NORMAL. The words REGEN TODAY will flash on the display.