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AO Smith 100110973 is a blocked flue safety switch that detects obstructed flue or vent conditions and interrupts equipment operation. The device is a normally closed (NC) pressure switch with an approximate trip/set point of 0.20 inch water column and is offered as a flush-mount replacement kit for commercial water heaters and boilers. It replaces legacy part numbers including 9006188215, 210908, and 192761-1.
Blocked flue safety switch; NC contact; 0.20 in WC set point; replaces multiple legacy AO Smith/Lochinvar part numbers
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