Aprilaire 4655 Humidifier Control 320788-703 verify your control board is

verify your control board is outputting the full 460V before condemning the motor

this TXV kit ensures the evaporator coil receives the exact metering required for varying heat loads

Common causes include restricted airflow or improper sensor placement

Designed for integration with Carrier fan speed controllers

ensuring proper footprint and terminal alignment

Aprilaire 4655 Humidifier Control 320788-703 verify your control board isThe Aprilaire 4655 Humidifier Control is a reliable, manual humidistat designed to provide precise low voltage 24V management for your central heating and cooling system. This essential HVAC humidity sensor utilizes a highly sensitive mechanical nylon ribbon filament that expands and contracts based on moisture levels, ensuring your whole house humidifier operates only when necessary. By manually adjusting the relative humidity (RH) setpointtypically