Installation; Power Supply - Renkforce 1168614 Notice D'emploi

9. Installation

a) Power supply
Caller unit
• With the supplied special screwdriver, loosen the screws that hold the unit from the
wall bracket. The screws are made special for anti-theft purpose. It is necessary to
keep the special screwdriver in a safe place.
• The caller unit is supplied with power via a bell transformer with an output voltage of
12 V/AC. In addition, you may insert batteries, which serve as a back-up in case of a
malfunction of the bell transformer. However, the door opener will not work, when the
caller unit is using batteries only.
If necessary, you may also use a 12 V/DC source to operate the caller unit.
• Connect the 12 V supply to the terminals (8) at the back marked with 12 V AC or DC.
The polarity is irrelevant and does not depend on the choice of the voltage supply
(AC or DC).
• Insert three AAA batteries into the battery compartment and observe correct polarity.
We strongly recommend using top-quality alkaline batteries instead of
rechargeable batteries because at low temperature (below 0 ˚C), the
rechargeable batteries offer poor performance and their capacity will drop.
In case of AC or DC supply failure, the unit will automatically switch to power from
batteries (if installed).
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8
Wall bracket