If I'm looking at them right, those old units are 25 year plus Lennox with used the "liquid line" as a metering device so the lines were of fixed length. You couldn't shorten them cause the systems wouldn't work then. I have one building left of them and they pretty much look the same with coils of copper sticking up in the air.
Here's a partial picture of one of them.
"The American Republic will endure until the day Congress discovers it can bribe the public with the public's own money.
- Alexis de Toqueville, 1835