I’ve gotten the advice:
- Divide the last two (of 4) numbers of the model number by 12;
- Use 1.4 x the compressor amperage;
- Calculate it using the BTUs somehow;
…and then there’s the date of manufacture:
Carrier said that they encode their commercial HVAC the same way they encode their residential HVAC, so the Building Intelligence center will work for that, at least for carrier. I don’[t know about all the others. Anybody???
Contact the manufacturer.