The SPDT output relay supports 120V or 208/240V AC input

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This Heil Quaker blower door switch is engineered to withstand the high-cycle demands of residential HVAC systems

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Lochinvar & A.O. Smith 100111255 Control Board 326070-701 The SPDT output relay supportsThe Lochinvar & A. O. Smith 100111255 Control Board is a critical OEM replacement part designed for high performance commercial water heaters and hydronic heating systems. As a central control board, it manages vital system diagnostics, ignition sequences, and multi stage temperature regulation to ensure peak operational safety. This HVAC control module is the direct replacement for obsolete part number 9006520005, engineered to restore factory spec