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Wire two ADC-VDB750s to a mechanical chime

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Two ADC-VDB750s can be wired in parallel to a single mechanical chime. This type of installation requires a doorbell transformer rated 16VAC, 20VA minimum.

Note: For more information about enrolling the ADC-VDB750s, see Alarm.com Video Doorbell (ADC-VDB750) - Installation Guide.

Wire two ADC-VDB750s to one mechanical chime

Important: Digital chimes do not support this wiring configuration.

Wiring Diagram
  1. Wire one terminal from each ADC-VDB750 to the transformer.
  2. Wire the other terminal from the first ADC-VDB750 to the FRONT terminal on the chime. 
  3. Wire the other terminal from the second ADC-VDB750 to the REAR terminal on the chime. 
  4. Wire one terminal of the transformer to the TRANS terminal on the chime. 
 Wire two VDB750s to one mechanical chime
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  1. Article type
    Installation
    Product area
    Doorbell
  2. Tags
    1. configuration
    2. doorbell
    3. dual