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Two-Speed Hi and Lo Fire Hydrotherm
Is it possible that Hydrotherm manufactured boilers that were intended to have both high and low fire (two stage gas valve) and a two-speed draft inducer, with separate pressure switches for high and low fire, and yet only a single pole aquastat and no way to control the two speeds and firing rates? I have seen this configuration twice, maybe three times. The wiring diagram says "Boiler will operate at high fire only". WTF? These were made in about 1985 or so. Some other versions of this boiler actually work with both high and low fire.
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