The HD series typically uses a field-replaceable seat design

the "U" suffix typically denotes a universal or retail-packaged version of the same industrial component

Always verify the part number against your specific unit’s data plate

Precision Switching: Features a calibrated pick-up voltage range of 171-184V and a drop-out voltage of 90V to shield sensitive compressor windings

Verify your controller output before installation to prevent damage

Nidec-US Motors 1125 Motor 318172-701 The HD series typically usesThe Nidec US Motors 1125 is a professional grade 3 4 HP direct drive blower motor engineered for high static residential and commercial furnace applications. Operating at 115Vac with a 900 RPM rated speed, this 4 speed Permanent Split Capacitor (PSC) motor allows for precise airflow adjustment to meet specific HVAC system requirements. Built on a 48Y NEMA frame size with an Open Air Over (OAO) enclosure, it utilizes self aligning ball bearings to