This unit operates on a standard 24V AC signal from the water heater or boiler control board

As a direct replacement for White-Rodgers 36J54-238 and part number 0151M00027S

Does this switch require professional calibration

making it suitable for use in heat pump systems where flow direction alternates

Fasco H33 Hex Hub Adapter Plate 326070-701 This unit operates on aThe Fasco H33 Hex Hub Adapter Plate is a specialized mounting solution designed for contractors performing motor replacements in legacy Nutone ventilation units. This kit allows you to adapt standard 3. 3 inch diameter motors to existing configurations that require a hex style hub interface. Engineered for precision alignment, the H33 ensures that the blower wheel or fan blade remains centered, preventing the vibration and premature bearing wear