YORK Advanced Processor Card MS390/ MC1100 W/ MS425 MC1252 ISOLATION TRANSFORMERYORK Advanced Processor Card MS390 MC1100 with MS425 MC1252 Isolation Transformer This assembly includes a processor card and a matching isolation transformer, both designed for integration within a YORK building or HVAC control system. The advanced processor card provides central control and logic execution, while the transformer ensures electrical isolation between control circuits and power supplies. Key Specifications Manufacturer: YORK Model