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One of the most common problems with any NuTone Apartment Intercom System is the inability to communicate with the Entrance Directory Speaker
This Video takes you through the most common cause of this type of problem on a NuTone Model 478 Apartment Intercom System.
If you are working on a NuTone 478 Apartment Intercom System and you need a detailed look at how the system is wired and how it operates. Watcwww.youtube.co... our Fundamentals Video about the 478 System:
For more detailed information about NuTone Intercom Systems: You Can:
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