The Johnson Controls SC-9100 is a versatile, high-performance standalone and networked controller within the Metasys building automation system. Designed for the precise management of heating, ventilation, and air conditioning (HVAC) equipment, the SC-9100 provides integrated control for air handling units, chilled water plants, and boiler systems. It features a robust internal processor capable of executing complex proportional-integral-derivative (PID) control loops and specialized energy-saving algorithms.

 

Product Parameters & Datasheet

The SC-9100 is engineered for high-density I/O management and seamless integration into facility-wide networks.

 

Technical Description

The SC-9100 functions as a programmable logic controller specifically optimized for environmental control. It utilizes a modular hardware architecture that allows for field-level expansion of I/O via the N2 bus. The controller features non-volatile memory (EEPROM) for the storage of application programs and configuration parameters, ensuring that the system returns to its last known state after a power interruption. The built-in N2 communication protocol allows the SC-9100 to report data to a Metasys Network Automation Engine (NAE) for centralized monitoring and global logic execution.

 

Country of Origin

This controller is designed and manufactured in Italy/United Kingdom under Johnson Controls International, complying with CE and UL standards for building automation and safety.

 

Application Fields

The SC-9100 is a standard choice for medium-to-large scale HVAC infrastructure:

• Air Handling Units (AHU): Controlling fan speed, damper positions, and heating/cooling valves.
• Chiller Plants: Managing sequencing and setpoint optimization for chilled water distribution.
• Boiler Control: Regulating water temperature and pump operation for commercial heating.
• Lighting Systems: Providing scheduled and sensor-based control for large office floors.
• Industrial Ventilation: Managing air exchange rates in manufacturing and cleanroom environments.

Product Usage Instructions

1. Mounting: Install the SC-9100 on a standard 35mm DIN rail inside a protective electrical enclosure. Ensure there is at least 50mm of clearance for wiring and heat dissipation.
2. Power Supply: Use a dedicated Class 2 transformer to provide 24 VAC. Do not share this transformer with heavy inductive loads like large motor starters to avoid electrical noise.
3. N2 Bus Wiring: Connect the RS-485 communication cable (N2 Bus) using shielded twisted-pair wire. Ensure the end-of-line (EOL) termination resistors are correctly set if this is the last device on the segment.
4. Programming: Use the HVAC PRO configuration tool to define the I/O types and download the control strategy. The device address must be set via the onboard rotary switches before the controller is added to the Metasys database.
5. Diagnostics: Monitor the integrated status LEDs. A steady “Run” LED indicates normal operation, while a flashing “Fault” LED may indicate a hardware failure or a communication timeout with the supervisory engine.