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Why is the external equalizer line critical for this model
ensure the sensing bulb is fully seated within the immersion well and use thermal conductive paste if required by the specific application to eliminate air gaps
000 BTU/hr and a maximum multiple load of 250
Encased in a rigid thermoplastic conduit box
dust-tight switch housing protects internal contacts from oil
Lochinvar & A.O. Smith 100208407 Switch Freon Why is the external equalizerThe 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