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The Goodman 0121R00006PDG 29-inch Base Pan is the OEM galvanized-steel foundation that supports the compressor, condenser coil, and cabinet of the GSC130484BB 4-ton, 13 SEER air conditioner. The base pan carries the full weight of the unit and channels condensate and rainwater through its factory-placed drain openings to prevent pooling and corrosion.
The base pan's footprint, mounting-foot locations, coil channel, and drain pattern are all model-specific. Only the genuine Goodman OEM base pan aligns with the existing coil tabs and compressor bolt holes for a true bolt-in replacement. Generic pans are not recommended for structural components like this.
Advanced (4/5). Replacing a base pan typically requires recovering refrigerant, lifting the coil and compressor assembly, transferring everything to the new pan, then reassembling, evacuating, and recharging. This is a shop-level job for a certified HVAC technician.