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Thanks chris545 and freonguy, I appreciate the shared experience and knowledge.

I'm trying to identify the age of a copeland compressor.
The s/n is GTC 82B 11097.
The first letter in the s/n is very hard to read and may not be a "G".
The m/n is 4RA3-2000-TSK

Thanks Joe - I'll print those and laminate them for my notebook

"The refrigeration systems' condensing units are typically designated by their nominal horsepower. Their compressor model numbers may indicate either horsepower or nominal Btu/hr. To get the best...

Thanks for the responses. I'll never be a Pro but I am fairly mechanical and I understand basics. It sounds like you're talking about air conditioners or maybe the terminology is similar.
I'm...

I asked a question in the general discussion a couple of days ago and was directed to this forum. I think this is the right place to ask my next questions related to system size.
How do I relate...

Thanks for the direction - I'll move my post

I'm new to the forum and I have a question about where to find information. I've been a licensed general contractor for 27 years and I'm starting to work in the energy saving / energy management...