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Universal Compatibility: Industry-standard 3
Rated for a maximum operating pressure of 250 PSI and temperatures up to 400°F
this valve body is specifically rated for low-pressure steam systems up to 15 psi WSP
Key Benefits: Direct Compatibility: Functionally replaces the Siemens MK-693-85
The most common causes are moisture accumulation in the sensing tubes
Aprilaire 4740 Relay 326010-701 Universal Compatibility: Industry-standard 3The 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