The module selection logic is determined by the internal diaphragm orientation and port connections

When installing this furnace draft inducer

the M511-1/2 is the designated direct replacement for the M511B-1/2 model

40VA rating provides sufficient overhead for modern digital thermostats and multiple stage contactors

Aaon R70320 Drive 322057-301 The module selection logic isThe Aaon R70320 Drive is a high performance 1HP 480V VFD engineered for precision motor control in commercial HVACR applications. Utilizing the robust Yaskawa V1000 platform, this variable frequency drive provides exceptional reliability for Aaon air handling units and rooftop systems. Designed for three phase induction motor regulation, it optimizes energy consumption by adjusting motor speed to meet real time demand. The compact microdrive design