Electronics Operation (EFU23D-A ONLY)
1. After the batteries are installed, the electronic display screen will be on for 25s. During this
period:
• Without any button operation, the screen will enter sleep mode after 25s and the display will
turn off.
• With button operation, the time to enter sleep mode will be postponed 25s. Without any button
pressed for 25s, the screen will enter sleep mode.
2. When the electronic display is in sleep mode:
• Press any button and the display will turn on. Without any buttons pressed for 25s, the screen
will enter sleep mode again.
• When a fl ow signal is detected, the screen will turn on. Without any button pressed for 25s,
the screen will enter sleep mode again.
(If 25s is not due and fl ow signal turns off, the screen will enter sleep mode)
3. Function of reset and set buttons:
• Enter setup: Normally, the display screen will be off. Press any button, and the display screen
will turn on. Press and hold the "Set" button for 3s to enter the setup state. The fi rst-stage
fi lter icon will fl ash.
• Pressing the "Set" button will change to the next fi lter stage. If it is on the third stage, pressing
the button will exit the setup state.
• If you press and hold the "Reset" button for over 3s, the service life of the selected fi lter is reset
to fi ve bars (100%). After resetting the fi lter life, the setup automatically changes to the next
fi lter stage. If it is on the third stage, pressing the button will exit the setup state.
NOTE: When the system is in the setup state for 10s without a button pressed, it will exit and return
to the normal display state.
4. Buzzer function:
• After installing the batteries, the buzzer will sound once.
• Each time the button is pressed, the buzzer sounds once.
• When the fi lter is in use and the if the fi lter surplus life ≤1 scale (<5%), the buzzer sounds once
every 6s to remind the user to replace the fi lter.
1000003973 (Rev. A - 05/17)
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