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Bard part number 8000-436 is an OEM scroll compressor (Copeland model ZP21K5E-TFD-130) used in select Bard wall-mounted HVAC units to circulate refrigerant through the system so the unit can absorb and reject heat properly. If your equipment is showing classic compressor-related symptoms like hard starting, tripped breakers, loss of capacity, or abnormal noise, replacing the compressor with the correct Bard-listed part helps restore factory performance and compatibility with the rest of the refrigeration circuit. Because compressor applications can vary by unit model, voltage, and refrigerant, confirm your Bard model and serial number against the unit parts list before ordering to ensure correct fit and electrical match.