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Why is the external equalizer line critical for this model
dust-tight switch housing protects internal contacts from oil
Encased in a rigid thermoplastic conduit box
which is essential for maintaining efficient oil return in low-temperature applications
the AP23A000 is an analog proportional model that responds to a specific voltage or current range for precise positioning rather than simple pulse-based control
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