Kessel Comfort PLUS Original Operation Manual page 57

6.2 Replacing the battery
The Comfort PLUS control unit is equipped with batteries in case of a power outage.
These batteries must be replaced if this is indicated on the display.
To replace battery:
Isolate the system! Make sure that cables and electrical components are
disconnected from the power supply during work.
▶ Move the main switch (1) on the control unit to the OFF position and open the
housing.
▶ Remove the cable ties, take both batteries out (2) and replace them by new
ones.
▶ Fix the batteries in place using the cable ties.
010-700_01 Installation and operating manual
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Fig. [24]
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