Backup Power Supply; Changing The Batteries - Siemens Codoor CD3500 Installation & User Manual

CD3500 & CD4000 Installation and User manual

Backup power supply

When the batteries are running low, Codoor will operate with the buzzer
sounding a low tone. The lock has a backup power supply sufficient for a
limited number of openings once the batteries have run down.
In order not to jeopardise security, the backup power supply is
restricted to 50 openings, after which the backup function is terminated
to conserve the remaining battery power. However, to allow battery
replacement to be carried out by the person in charge, the programming
code is not disabled, to allow the door to be opened.

Changing the batteries

When the unit's batteries run out, Codoor will stop working. The lock has
a backup power supply that will allow the door to be opened a limited
number of times, but the batteries should be replaced as soon as they
fail. Follow these steps:
1. Remove Codoor from the door.
2. Remove the batteries from the rectangular shaped holes on the
lower part of the back of the unit.
Always change both batteries. Changing only one battery will
3.
dramatically reduce the life of the new battery. The batteries should
be lithium type (2 batteries type U9VL). See Technical Specifications.
4. Re-fix the housing.
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