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12.3. Maintenance of the controller
To clean the front face of the equipment, use a soft cloth with water and non-abrasive liquids.
The HZI855 controller is conceived to be a maintenance free, fit and forget unit. However, it is recommended to perform visual
inspections periodically on the device, checking the connections, that the display screen is functional and the LED using the lamp test
button and ensuring the correct functioning with the switching device and with any possible associated software.
As a best practice, perform at least one full cycle with your equipment (solution with the cont RTSE) every year.
RTC Battery replacement
Depending on the working and environmental conditions conditions the battery will need to be replaced when the controller displays a
message "RTC LOW BATT". Should the time & date at power up be incorrect it will be time to replace the battery.
To do so:
1. Disconnect all terminals from the controller.
2. Release the cover on the side of the controller containing the battery.
3. Remove the old battery with an appropriate plastic tool.
4. Place the new battery on the correct side (polarity) in the holder from the pcb and push with the finger until it reaches the position of
the old one.
5. Put back the plastic cover on the side of the controller and pressure slightly until it perfectly fits.
6. Connect back the terminals to the controller.
7. Power up and adjust time and date.
For battery replacement, use a BR2032 coin-type cell.