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Industrial Durability: Rugged aluminum construction with high-quality synthetic rubber diaphragms for extreme temperature environments
the pilot and main orifices must be correctly sized to the manifold for the specific fuel type being used
serves as the updated direct replacement for HT31AR100
engineered for high-capacity performance in two-pipe hot water and low-pressure steam systems
Since both brands often share internal heat exchanger designs in their condensing lines
Lochinvar & A.O. Smith 100109973 Switch L99H008 Industrial Durability: Rugged aluminum constructionThe Lochinvar & A. O. Smith 100109973 Blocked Inlet Switch is a critical safety component designed for high efficiency condensing boilers and water heaters. As a normally closed air pressure switch, its primary function is to monitor the intake system for airflow restrictions. If the intake air connection screen becomes clogged or the vent piping is obstructed, the switch detects a fall in pressure and opens the electrical circuit, instantly shutting