While the 700 series is versatile

including the 310648/U variant

Durable 2NO/2NC contacts support versatile wiring

When you are dealing with a variable-speed blower that refuses to ramp up or keeps throwing diagnostic codes

ensuring stable operation during peak cooling loads

Trane WHL1171 Blower Wheel 321894-709 While the 700 series isThe Trane WHL1171 Blower Wheel is a precision engineered OEM replacement part designed for high static pressure applications in furnace and air handler assemblies. Featuring an 11 inch diameter and a 7 inch width, this CW (clockwise) rotation wheel ensures optimal CFM delivery and static balance. The 1 2" bore hub is machined for a secure press fit or set screw attachment to standard blower motor shafts, minimizing vibration and mechanical strain on