Lennox 51W90 Pressure Switch Integrating this HVACR motor control

Integrating this HVACR motor control relay into your preventative maintenance workflow ensures hardware longevity and prevents catastrophic equipment failure during amperage spikes

this OEM component provides the exact terminal alignment and footprint for a drop-in installation

Enhanced Safety: Built with a pressure-sensitive interrupter to safely remove the capacitor from the circuit at the end of its functional life

as a cross-platform part

Precise 1/2" Threading: Eliminates the risk of cross-threading during packing nut installation

Lennox 51W90 Pressure Switch Integrating this HVACR motor controlThe Lennox 51W90 Pressure Switch is a critical safety component designed for precise combustion air monitoring in high efficiency gas furnaces. Engineered with a set point of . 65"wc, this SPST (Single Pole Single Throw) switch ensures the inducer motor is generating sufficient vacuum before allowing the ignition sequence to proceed. As a genuine OEM replacement part, it offers a direct fit for Lennox G43UF and G51MP series units, maintaining the