Nordyne 664304R Manifold Tube 321894-706 Check for cracks in the

Check for cracks in the porcelain or heavy oxidation on the metal rod

Engineered with a durable SPDT switch action (Single-Pole

Precise 6 PSI Cut-out: Calibrated for accurate low oil pressure detection to safeguard compressor bearings

these flanges typically come with one set screw positioned over the keyway to lock the hub securely to the shaft

Set your multimeter to the DC microamp (µA) scale and connect it in series between the sensor terminal and the control board lead

Nordyne 664304R Manifold Tube 321894-706 Check for cracks in theThe Nordyne 664304R Manifold Tube is a critical engineering component designed for high efficiency gas furnaces and HVAC systems. As a genuine OEM gas manifold, this 4 burner upflow manifold ensures precise fuel distribution to the burner assembly, maintaining the correct pressure balance required for clean combustion. This specific Nordyne replacement part is engineered for the G6 series, specifically the 90% AFUE upflow natural gas furnaces, and is