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Its solid-state circuitry is far more efficient than traditional copper-wound transformers
Maintains Operational Efficiency: Precise injector alignment ensures a stable flame pattern
Universal Compatibility: Industry-standard 3
The New OEM Carrier HK42FZ012 Circuit Board ships out directly from the manufacturer and comes well-tested to ensure smooth and more efficient operation
Using the 971-0090-47 ensures the trip points match the specific amperage range of your equipment
Aprilaire 4740 Relay 326010-701 Its solid-state circuitry is farThe 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