Comelit 3522 Power Adapter
Overview
The Comelit 3522 is a dedicated voltage conversion adapter that transforms incoming 16Vac supply to regulated 12Vdc output. Built specifically for the Visto smart doorbell system, the 3522 bridges standard transformer feeds (commonly 16Vac in residential and light commercial intercom installations) to the precise 12Vdc required by Visto components. The unit accepts input voltage from 12V to 20Vac, providing stable regulated output regardless of minor supply fluctuations — a critical detail when controlling existing bell systems that may have aging or undersized transformers. Housed in dark graphite plastic (RAL9011), the compact form factor (59 × 40 × 14 mm) fits into control panels, equipment closets, or behind entry control surfaces without consuming valuable mounting space.
Compatibility
The Comelit 3522 is designed for Comelit Visto series smart doorbells and related intercom systems requiring 12Vdc supply. It integrates with existing bell circuits, allowing retrofit installation to control pre-existing doorbell wiring without replacing the transformer. This adapter is intended for indoor mounting in control rooms, equipment racks, or within entry panels — not outdoor or damp environments.
Installation Notes
Input acceptance range of 12–20Vac means this adapter tolerates modest voltage sag or surge from aged transformer feeds — useful in retrofits where supply stability is uncertain. Wire connections are straightforward: AC input from the existing 16Vac transformer, regulated 12Vdc output to the Visto doorbell module. Verify input voltage before installation to confirm it falls within the 12–20Vac window. The plastic enclosure is suitable for dry indoor mounting only; do not expose to moisture or outdoor conditions.
