Lochinvar & A.O. Smith 100093923 Assembly 321894-709 System Longevity: Prevents premature motor

System Longevity: Prevents premature motor burnout by interrupting the control circuit before winding insulation is compromised

This HVAC part is cross-referenced for several high-efficiency York

Aprilaire (specifically 560

Permanent Lubrication: Sealed ball bearings eliminate the need for routine maintenance and prevent premature failure due to friction heat

Key Benefits: System Compatibility: Purpose-built for Weil McLain HE

Lochinvar & A.O. Smith 100093923 Assembly 321894-709 System Longevity: Prevents premature motorThe Lochinvar & A. O. Smith 100093923 Assembly is a precise MFG40 NAT Manifold Door Assy engineered for natural gas water heaters. As a veteran grade OEM replacement part, this assembly ensures a critical airtight seal for the combustion chamber, maintaining the high efficiency performance required in standard and commercial heating applications. Built to withstand the thermal stress of constant cycling, the manifold door assembly integrates a heavy