The Automated Logic ZN551 is a fully programmable, native BACnet Advanced Application Controller designed to control a single zone within a building. It is well suited for variable air volume (VAV), heat pump, unit ventilator, fan coil, lighting, exhaust fan, and other packaged HVAC applications.
The controller communicates over an EIA-485 network using BACnet MS/TP and integrates with the WebCTRL building automation system. EIKON graphical programming software supports custom control sequences, while a library of standard programs accommodates common zoning applications.
The ZN551 supports up to 11 control points, consisting of five universal inputs, five digital outputs, and one analog output. Compatible Automated Logic sensors support setpoint adjustment and occupancy overrides, while touchscreen interfaces provide equipment management and troubleshooting capabilities. The controller also supports demand limiting, optimal start, remote firmware upgrades, and independent distributed control.
Key Features & Benefits
Features:
- Designed for single-zone HVAC control, including VAV, heat pumps, and unit ventilators
- Suitable for fan coil units, lighting, and exhaust fan applications
- Supports native BACnet MS/TP communications over an EIA-485 network
- Supports custom control sequences through EIKON graphical programming software
- Includes a standard library of control programs for common zoning applications
- Provides 5 universal inputs configurable for thermistor or dry contact signals, with inputs 1 and 2 also supporting 0–5 Vdc
- Includes 5 normally open digital relay outputs rated up to 1 A at 24 Vac/Vdc
- Includes 1 analog output rated 0–10 Vdc
- Supports up to 5 compatible wireless and/or wired ZS sensors
- Supports one Equipment Touch or OptiPoint interface
- Supports compatible LogiStat and LogiStat Plus zone sensors
- Provides live visual displays of control logic for troubleshooting
- Supports remote firmware upgrades
- Supports demand limiting and optimal start strategies
- Includes built-in surge and transient protection
- Provides LED status indicators for communications, operation, errors, power, and digital outputs
Benefits:
- Supports flexible control for individual building zones
- Allows custom control sequences for specific equipment requirements
- Enables setpoint adjustment and occupancy overrides through compatible sensors
- Supports independent distributed control without relying on other devices
- Helps technicians troubleshoot equipment using visual control logic displays
- Supports easier startup and commissioning through WebCTRL interfaces
- Supports demand limiting and optimal start strategies
- Provides flexible integration with compatible sensors and touchscreen interfaces