PROEL AE300, Operating And Installation Manual, Page: 15 / 50

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4.s Clock battery replacement
The battery-holder for the buffer battery of the internal clock and calendar is located on the bottom of the mainboard. Although these batteries
have a very long life, we recommend replacing them every 24 months.
To avoid having to reset date and time, you can replace the battery with the system on and powered.
4.t Ordinary device maintenance
a) Periodically clean the device with a dry cloth
b) Periodically check that the ventilation openings are not obstructed
c) Periodically check the wiring and connections
d) Periodically check the efficiency of the earthing connection
e) Replace the Pb-Gel batteries every 4 years with units having the same voltage and capacity
f) Replace the CR2032 battery of the internal clock (see par. 4s) every 4 years
g) Check the status of EVAC and ALARM messages.