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.
Sarcotherm Installation and Service Manual
Special thanks to George Peteya, P.E., of Slant/Fin for sharing this circa-1955 Sarcotherm Installation and Service Manual for Modulating Outdoor-Indoor Controls (Sarcotherm Type STA-1 and Type STA-1D). As George wrote, "It's probably the last surviving copy of the first outdoor-air reset controller."
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