Lennox 14A53 Pressure Switch L99H008 The Emerson Alco 049638

The Emerson Alco 049638

Reliable Communication: Utilizes standard 18-20 AWG thermostat wiring for the ABCD bus

It is not a direct substitute for HSI or DSI valves requiring a redundant solenoid configuration

Direct Modular Replacement: Specifically tailored for 25 Series Main Valves

013 orifice (part number 660922) pre-installed

Lennox 14A53 Pressure Switch L99H008 The Emerson Alco 049638The Lennox 14A53 Pressure Switch is a critical safety component designed for two stage gas furnaces, specifically engineered to monitor dual pressure thresholds of . 40" WC and . 70" WC. As a vital furnace draft inducer switch, it ensures the combustion blower is moving sufficient air to clear flue gases before ignition occurs. This dual stage pressure switch prevents hazardous operation by opening the electrical circuit if the static pressure falls