Bosch Climate 5000 Series - 3 x 3 Cassette Unit Remote Controller; Operation of Buttons

Installation Instructions
Climate 5000 Series Gen 3 Wired Wall Thermostat (02.2022)
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8. Plug the white end of the 2 core wire (cable D) into the CN43 port on the adapter board.
Figure 21
9. Place the adapter board in the location shown below.
Figure 22