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the EF660017 utilizes a slow-opening design to ensure smooth ignition transitions in Direct Spark Ignition (DSI) and Hot Surface Ignition (HSI) systems
making it a critical replacement motor for maintaining system head pressure during peak load conditions
making it ideal for commercial refrigeration defrost cycles or ventilator fan control
managing ignition sequences
For technicians performing HVAC diagnostics
Lennox 11U72 Pressure Switch 340155-7026 the EF660017 utilizes a slow-openingThe Lennox 11U72 Pressure Switch is a critical safety component designed for precise combustion air monitoring in high efficiency gas furnaces. As a genuine OEM replacement part (also identified as Lennox 104371 09), this single pole, single throw (SPST) switch features a normally open contact configuration. It is factory calibrated to actuate at a 0. 90" WC (inches water column) set point, ensuring the draft inducer motor is generating sufficient
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