Bosch OR80 OT Operating Instruction page 11

▶ Drill two holes from cable entries on the wall (space between hole centers is
60~80mm),fill the fitting expansion pipes, and then use fitting
screws(PA4*30mm) to fix the back cover, (see Fig. 4).
Fig. 4
▶ Connect wire to wire holder of PCB, and align four positioning buckles with four
square holes, then fix product onto the back cover, as shown in Fig. 5.
Fig. 5
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OR80 OT Thermostat