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Duotone terrace — saffron brief on the left, garden-folded ledger on the right.
this printed circuit board (PCB) manages critical blower motor timing
This replacement circuit board replaces legacy part numbers and is essential for maintaining consistent flame signaling and temperature regulation in residential and commercial hydronic applications
it is typically used for a single pump
offering enhanced logic for lead/lag sequencing
The bimetal sensing element is tuned to open the electrical circuit at 150°F to prevent heat exchanger damage and close at 110°F once temperatures return to a safe operational threshold
Lochinvar & A.O. Smith 100109686 Gasket 320788-704 this printed circuit board (PCB)The Lochinvar & A. O. Smith 100109686 Cleanout Gasket is a critical OEM replacement part engineered for high recovery commercial and residential water heaters. As a veteran grade HVAC sealing component, this gasket is the direct updated version of the legacy 9004099015 and 9004099215 part numbers, ensuring a precise 4 1 8" x 5 1 16" profile for a leak proof fit. Designed to withstand the thermal expansion and high pressure environments typical of
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