This chapter on hot water heating systems and piping was prepared by Professor F.E. Giesecke (Director of Texas Engineering Experiment Station in TX) for the The American...
Sarco Alternating Receivers and Lift Traps
The return trap is like a mechanical condensate pump. This 1943 piece about Sarco Alternating Receivers and Lift Traps from the Sarco Company does a nice job of explaining how it works.
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