Honeywell Alerton VLC-550-E

Brand: Honeywell Building Technologies — Alerton brand

Product Brief: A DIN-rail or screw-mount BACnet MS/TP programmable unitary controller for HVAC and building automation — controls air handlers, heat pumps, chillers, and terminal units. Programmed with Alerton VisualLogic® graphical tool.

Category: Honeywell

Description

Technical Specifications

Microprocessor: 32-bit ARM Cortex-M4F @ 80 MHz
Memory: 512 KB non-volatile flash (program + trend + alarm storage)
Universal Inputs: 5 × 10-bit resolution universal inputs
- Configurable per point as: Thermistor (10 kΩ NTC), Dry Contact, 0–5 VDC, 4–20 mA
- Input 0 supports Alerton Microset / Microset II / Microset 4 room sensor (display & setpoint)
Digital Outputs: 5 × Triac outputs, 24 VAC 50/60 Hz, 500 mA continuous, 800 mA inrush
Binary Outputs: Rated 24 VAC @ 500 mA (triac), suitable for pilot relay or direct small loads
Communication: EIA-485 (RS-485) BACnet MS/TP; Auto-baud 9.6 k – 115.2 kbps; Status LED
Programming: VisualLogic graphic DDC; execution scan time ≈ 0.1 s; timer resolution 0.1 s
Power Supply: 24 VAC ±10%, 50/60 Hz, min. 5 VA + load; 24 VAC one side must be grounded
Environmental: Operating 0 °C to +70 °C (–17 °F to +158 °F); 5%–95% RH non-condensing
Dimensions: ≈ 125 mm (H) × 127 mm (W) × 36 mm (D)
Mounting: Screw mount or DIN rail with adapter
Certifications: UL 916(Open Energy Management Equipment), BTL listed BACnet ASC, FCC Part 15 Class A, CE

Features

Standalone or network-operated; retains program on power loss
Supports up to 76.8 kbps BACnet MS/TP peer-to-peer on the LAN
Local override via Microset room sensor
Trend logs, alarm enunciation, time schedules built-in

Installation & Notes

Wire 24 VAC with proper phasing; do not connect 24 VDC to AC power terminals
Terminate RS-485 pair with 120 Ω resistor at farthest device; observe A/B polarity
Do not exceed triac output rating — use interposing relay for inductive AC loads > 500 mA
Program download requires Alerton WorkPlace / VisualLogic software and BACnet MSTP connection

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