Turning the knob counter-clockwise increases the temperature setting

Its large knurled feed screw knob provides tactile control over cutting pressure

preventing the core vacuum lock common in older 1-pipe steam systems

system parameters

With a standard 3/4" Male NPT inlet and a 3/4" Female NPT outlet

Aprilaire 4670 Motor 321702-401 Turning the knob counter-clockwise increasesMaintain the peak efficiency of your whole house humidification system with the Aprilaire 4670 Motor. This genuine OEM humidifier motor is specifically engineered for the Aprilaire 700 series, including models 700, 700A, and 700M. Operating at 24V with a power consumption of 3. 5W, this synchronous motor provides a steady 2 RPM rotation to ensure consistent water distribution across the vapor pad. As a direct replacement for the legacy Aprilaire 4237