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the UTT-01 motor tester minimizes system downtime by diagnosing faulty communicating modules and internal windings in residential and commercial units
Key Benefits: Direct Compatibility: Functionally replaces the Siemens MK-693-85
Using the 971-0090-47 ensures the trip points match the specific amperage range of your equipment
This unit is specifically rated for 220V AC
Aprilaire 4740 Relay 326010-701 the UTT-01 motor tester minimizesThe 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