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Versatile Ignition Support: Fully compatible with both Direct Spark Ignition (DSI) and Hot Surface Ignition (HSI) control boards
this 1-speed direct drive unit provides the exact mechanical fit and electrical characteristics needed to restore factory-spec airflow without the complications of universal mounting kits
While cleaning with a light abrasive can temporarily restore signal
preventing short-cycling and optimizing system efficiency
Lochinvar & A.O. Smith 100208407 Switch Freon Versatile Ignition Support: Fully compatibleThe Lochinvar & A. O. Smith 100208407 Blocked Flue Switch is a critical safety component designed for high efficiency condensing boilers and water heaters. As a factory authorized replacement for PRS2708 and PRS2708K, this blocked flue pressure switch is calibrated to a specific 55" WC set point to detect dangerous venting restrictions. When flue gases cannot exit the heat exchanger due to obstructions like bird nests, ice, or excessive condensate
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