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3.13 Battery Type & Replacement
The real time clock and program information is battery backed up by a lithium
coin cell. When mains power is interrupted, the clock, backed by the battery,
will continue to operate normally for seven days after which it will stop. The
battery will continue to back up the program information.
The battery has a service life of approximately five years. The condition of the
battery is monitored and when replacement becomes necessary, this will be
indicated on the display. Replacement will be indicated on the display only if
mains supply is present.
To replace the battery, isolate the control from the mains electricity supply and
remove the plugs / screws securing the front panel to the rear case. Carefully
remove the panel and detach the ribbon cable from the power PCB assembly.
Remove the old battery and fit the new battery as shown in the photograph.
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