Alpha Communications AC219 Annunciator Controller

The Alpha Communications AC219 Annunciator Controller is a tone-enabled control unit designed for AlphaEcall, CM800, DS100, and SF202B emergency‑call and intruder alarm systems. It provides a built‑in tone oscillator, a DC power supply, a Form 'C' relay, tone silencing control, and a tone‑off visual indication, with 24VDC for accessory devices. The unit operates on 16VAC low‑voltage wiring (30 VA max) using SS106 or SS146 transformers, and all connections use positive screw terminals; it can be surface‑mounted or installed in the optional CEC152 UL‑listed junction box. Dimensions are 3.375"W x 5.625"H x 1.25"D (86 x 143 x 32 mm); note that when replacing PK2019, the Tone‑Off Light behavior is inverted—the Tone‑Off Light goes OFF when the tone is silenced.