It's a small wooden walk-in; 5.5'x6.5'x7.5'; probably 40 years old.. I've been to the US Cooler site and another site, and tried their load calculators. But I'm getting different results. I would also like to convert it to 134a or 404a (it's R12). Tecumseh site says the old compressors rated at 9150 BTUH with a 55F box. Problem is I have a 35F box and Tecumseh has no data for that. Nameplate on the condensing unit is obliterated. I looked up Tecumsehs model # breakdown for the compressor, and that tells me the compressors rated at 4900 BTUH (doesn't give a matching evap, or box temp. To tell the truth, that compressor isn't original and it may be wrong. Does anybody know another website that does refrigeration load calculations?
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