Draw out the specs. I am not sure there any. The first part of the building was 1910, using used compressors. And from there they just added machines as the load went up. One night when the plant was running full out one of the watch engineers went around adding up all the compressors running and did the calculations against the amount product frozen and they did not jive, too much product frozen. And that got the text book types asking questions.
I will describe what I remember.
Went I was young and Pop first worked there most of the belt driven compressors had flat belts, but over the years they were converted to flat v-belts.
It was two stage compression and valved so most compressors could be run high or low stage. The compressors varried in horse power so they could vary the combination of compressors until they had the right horse power. The smallest was 15hp the largest I think 100 Hp.
If the low pressure went up you would change compressors up in hp. If the IP went up add compressors on high side. If the High side went up add a cooling tower fan. And so on.
The evaporators were flooded evaps with hand expansion valves. The defrost was by polyethanene gylcol solution. It was pumped over the coils and adsorbed the water, it was then pumped to a boiler where the excess water was boiled off and reused.
I could go on but this is long enough.