York 031-00935D Logic Control Board

This is a York 031-00935D Logic Control Board, a key module in York HVAC chiller systems used for input/output logic and relay interfacing. Manufacturer: York International (now part of Johnson Controls) Model: 031-00935D Type: Logic Control / Relay Interface Board Function: Handles signal processing, relay actuation, and system logic coordination for compressor, fan, and sensor circuits. Voltage: Typically 24 VDC (logic control power) Features: • Array of resistors, diodes, and relays for signal isolation and switching • Multi-pin connector interface for integration with main control boards • Conformal-coated PCB for protection in humid environments • LED status indicators for troubleshooting (varies by revision) Applications: • York YK and YS chiller systems • Used in conjunction with 031-01065 and 031-01632 main control boards • Interfaces to temperature, flow, and pressure sensors Construction: • Fiberglass PCB substrate (FR-4) • Gold-plated contacts for signal reliability • Compact layout for service-panel mounting Manufacturer Location: York, Pennsylvania, USA Please review pictures carefully and let us know if you have any questions!