Aprilaire 4740 Relay 321894-709 the tray should be replaced

the tray should be replaced to maintain proper water flow

This valve body typically interfaces with standard ClimateMaster 24V spring-return or non-spring return actuators (such as the 23B0012N11 series) used in water-loop and ground-loop applications

ensuring compatibility with most industrial power configurations

this CW rotation motor is the authorized engineering cross-reference for the discontinued MOT19225

Aprilaire 4740 Relay 321894-709 the tray should be replacedThe Aprilaire 4740 Relay is a critical replacement component engineered specifically for Aprilaire 700 series humidifiers, including the 700A and 700M models manufactured after 2008. As a genuine AprilAire humidifier part, this fan relay is responsible for powering the circulator fan when the humidistat signals for moisture. Unlike older "Series One" versions that utilized the 4238 control board with an integrated transformer, this modern 24V