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For technicians servicing variable speed fan-assisted furnaces like the C9MPD
How do I know if this pressure switch is the cause of a furnace failure
Look for a "mushroomed" or bulging top
visible pitting on the contact surfaces
Armstrong International B1669-1 Pressure Change Assembly Els PW 17895 For technicians servicing variable speedThe Armstrong International B1669 1 Pressure Change Assembly (PCA) is a critical steam trap repair kit engineered specifically for inverted bucket traps. This assembly includes a matched 1 4" orifice, valve seat, and lever mechanism, providing a direct drop in solution for maintaining trap efficiency. Designed for Armstrong 811, 211, 310, TVS 811, 881, 981, and EM series traps, this PCA is calibrated for a 15 PSI maximum operating pressure. Utilizing
