Product Overview

The YORK 031-02893-001 is a fully populated Motor Monitoring Board designed as an integral component of Johnson Controls YORK OptiView™ control systems for centrifugal chillers. This specialized control board serves as the critical interface between motor-mounted sensors and the chiller’s microboard, performing continuous real-time monitoring of motor health parameters including winding temperatures, bearing temperatures, vibration levels, and cooling coil leak status . The 031-02893-001 is specifically engineered for YORK YK series centrifugal chillers, which incorporate single-stage compressor designs renowned for their reliability in mission-critical applications such as hospitals, chemical plants, and gas processing facilities .

The YORK 031-02893-001 distinguishes itself from its counterpart, the 031-02893-000 board, through its fully populated component configuration. The -001 variant includes populated RTD analog input and vibration analog input components, making it capable of supporting all sensor types required for comprehensive motor monitoring, whereas the -000 board lacks these components and is restricted to applications not requiring those sensor inputs . The 031-02893-001 board receives +24VDC, +12VDC, and -12VDC power at terminal block TB4 and features onboard voltage regulation to generate +5VDC and +15VDC supply voltages . As an OEM replacement part for YORK HVAC equipment, the YORK 031-02893-001 ensures seamless integration with existing OptiView™ control centers and maintains the high standards of reliability expected in critical cooling applications .

 

Technical Specifications

Parameter Name	Value
Product Model	YORK 031-02893-001
Manufacturer	Johnson Controls / YORK
Product Type	Motor Monitoring Board / Control Board
Applicable Systems	YORK OptiView™ Control Center, YK Series Centrifugal Chillers
Board Suffix	-001 (Fully Populated, supports RTD and Vibration inputs)
Supply Voltage	+24VDC, +12VDC, -12VDC at TB4
Onboard Regulated Voltages	+5VDC, +15VDC
Communication Protocol	RS-485 Modbus RTU
Network Address	2 (configurable via SW1 DIP switches)
Communication Port	COM3 port on microboard
Sensor Inputs	RTD analog inputs, Vibration analog inputs
Monitoring Parameters	Winding temperature, bearing temperature, vibration, cooling coil leak status
Power LED	CR6 (illuminates when +5VDC is present)
Status LED	CR8 (blinks 2 times per second during normal operation)
RX/TX LEDs	CR12 (RX), CR13 (TX) for serial communication activity
Test Points	TP1 (GND), TP2 (+5VDC), TP5 (+2.5VDC reference), TP7 (+1.25VDC reference), TP9 (+12VDC filtered)
Physical Dimensions	65.5 cm × 30 cm × 3 cm
Weight	Approximately 0.84 kg
Enclosure	Mounted separately from OptiView™ Control Center
Product Status	OEM Replacement Part, Active Support

 

 

Main Features and Advantages

The YORK 031-02893-001 delivers comprehensive motor protection through its sophisticated monitoring architecture and integration with the OptiView™ control system. The board continuously receives outputs from motor-mounted sensors and transmits the processed sensor values to the microboard via RS-485 Modbus serial communications . The microboard then compares these parameters against user-defined warning and safety shutdown thresholds. When a parameter exceeds the warning threshold, an alert is displayed on the OptiView™ screen; when it exceeds the safety threshold, the YORK 031-02893-001 initiates an automatic safety shutdown to prevent catastrophic motor damage . This hardware-based protection scheme operates independently of software delays, ensuring rapid response to developing fault conditions.

The fully populated design of the 031-02893-001 offers significant versatility compared to the partial -000 variant. The inclusion of populated RTD and vibration analog input components allows the YORK 031-02893-001 to support the full range of motor monitoring sensors required for comprehensive protection of large centrifugal compressor motors . This enables the system to monitor not only temperatures but also mechanical vibration signatures that can indicate bearing wear, imbalance, or other developing mechanical issues before they result in equipment failure. The board’s diagnostic LEDs provide immediate visual feedback on operational status: the STATUS LED (CR8) blinks at 2 Hz during normal operation, while the RX and TX LEDs illuminate to confirm active Modbus communication with the microboard .

The YORK 031-02893-001 supports customizable protection setpoints through the OptiView™ interface, allowing service technicians to configure warning and safety shutdown thresholds for winding temperatures, bearing temperatures, and vibration levels . The board also supports individual enabling or disabling of specific monitoring channels, providing flexibility for different motor configurations and application requirements. The 031-02893-001 features onboard test points that allow technicians to verify power supply voltages during troubleshooting, including +5VDC, +12VDC filtered, and reference voltages of +2.5VDC and +1.25VDC . This comprehensive diagnostic access simplifies field servicing and reduces mean time to repair.