OEG RT2R Bedienungsanleitung Seite 34

Unscrew and temporarily remove the protection cover (Picture 29).
Room thermostat is intended for wall mounting. In case you don't
have installed a flush box, tear away the drilling template from the
package and mark drilling holes. Use enclosed screws to fasten the
wall plate on the wall (Picture 30). After you have done connecting
the wires (see chapter Connecting the wires), screw back the
protection cover. Now put RT2 back onto the base by doing the
following. Hook RT2 on top of the wall plate and push it with bottom
towards the wall plate (Picture 19- CLOSE).
Picture 29 Picture 30
Flush box
Wall
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Installation manual