Where does the Backup Battery Plug In on your NuTone IM4406 / IMA4406
Thursday, December 29, 2016 at 8:56AM When it's time to replace the Backup Battery in your NuTone IM4406 or IMA4406 it can be a little tricky to find the Battery Plug Socket. This is because the Battery Socket is located on the underside of the Main Circuit Board.
The Red Arrow points to the area where the Battery Socket is located.
The Blue Arrow points to battery socket, which is mounted on the underside of the circuit board.
The Pink Arrow points to the plug on the backup battery pack
Here you can see the plug from the backup battery pack partially inserted into the socket.
It is very important for the black wire to be on the left side when the plug is inserted into the socket.
This is because batteries have both positive (+) and negative (-) terminals. The black wire is negative and the red wire is positive. If the battery pack is plugged in backwards, it will not backup your Master Station and the batteries will be damaged when the Intercom tries to recharge them.
Once you have the plug aligned with the socket (with the wires in the correct positions) you can use a small flat screwdriver which has been slipped in between the red and black wires to carefully push the plug into the socket.
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