O-E Vapor System Manual
This manual was created by O-E Specialty Manufacturing Co. and outlines how to install the "O-E" Perfect System, which is a Vapor Vacuum heating system.
Nash Engineering Company Steam Heating Controls
These pages are from Nash Engineering Company's Bulletin #402-D describing their variable vacuum sub-atmospheric steam heating controls using their own vacuum and condensate pumping equipment. Thank you to Dennis Pataki for sharing this document.
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