Lochinvar & A.O. Smith 100111022 VFD Assembly 318973-401 Technicians should note the microprocessor-based

Technicians should note the microprocessor-based control logic

Designed for Weil McLain Ultra Series 1 and 2 residential gas boilers

125-inch leads and stripped-end connections

Efficient Maintenance: Features a threaded cap with a 1/4" NPT tapping for optional blow-off

Lochinvar & A.O. Smith 100111022 VFD Assembly 318973-401 Technicians should note the microprocessor-basedThe Lochinvar & A. O. Smith 100111022 VFD Assembly is a high performance variable frequency drive engineered for precise motor speed control in high efficiency commercial water heaters, specifically the Cyclone BTH 400 and BTH 500 series. This OEM replacement part (formerly 9006245005) is vital for modulating the blower motor to match varying load demands, significantly enhancing energy efficiency and reducing operational wear on internal components.