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the FM55 is the designated replacement for the legacy Fasco 44 bracket
It is typically mounted on the barometric draft control or the draft hood
For contractors servicing Williams Monterey Counterflow Top Vent Furnaces
With a 3/4 inch FNPT inlet and an oversized 1 inch FNPT outlet
this 49L92 pressure switch is frequently used as a factory replacement part for select Armstrong and Ducane HVAC units
BASO C664BBA-1C Intermit Freon the FM55 is the designatedThe BASO C664BBA 1C Intermittent Pilot Ignition Control is a microprocessor based safety module engineered for indirect burner supervision in 24VAC heating systems. This unit is the direct replacement for BG1600M10FM 1AA and G600KX 1, providing a seamless upgrade for legacy controls. Designed for high reliability, it features a 4 second pre purge cycle to clear residual gas and an 8 second trial for ignition (TFI) window to ensure safe pilot