Aprilaire 4740 Relay 326010-701 Maintains Operational Efficiency: Precise injector

Maintains Operational Efficiency: Precise injector alignment ensures a stable flame pattern

Its solid-state circuitry is far more efficient than traditional copper-wound transformers

This unit is specifically rated for 220V AC

Rated for a maximum operating pressure of 250 PSI and temperatures up to 400°F

Key Benefits: Direct Compatibility: Functionally replaces the Siemens MK-693-85

Aprilaire 4740 Relay 326010-701 Maintains Operational Efficiency: Precise injectorThe 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