nash jennings vacuum pump

rob brown

hi all, iv'e got a cust. with a nash jennings "all piped up" duplex vacuum/condensate setup. circa 1923, still running. i was wondering if anybody had any i&o manuals or any info at all on the operation and adjustment of these systems? some background- 7 story office building, about 15 yr old w-m lgb boiler, about 4000' edr. 1-2.5", 1-4", and 1-6" motorized zone valves, all not functioning.(but held open manually). system also uses what dan called "the worst possible way to get the job done" in that the pumps lift the condensate about 5' from a trench with a double lift fitting. i'm just trying to correct some distribution problems and gain a better understanding of system operation. attached is pic of setup. tia rob