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This blade-style relay is UL
Always check your tubing diameter before installation
The York S1-024-35876-000 Control
What equipment is this compatible with
Common Questions Which pump models use the 100277953 volute gasket
Lochinvar & A.O. Smith 100208488 Relay Board R-410A This blade-style relay is ULThe Lochinvar & A. O. Smith 100208488 Relay Board is a critical OEM replacement part engineered for high performance hydronic heating and water heating systems. As the direct replacement for RLY2049, this board facilitates precise communication between the Smart System control module and peripheral components, including pumps, fans, and gas valve relays. Designed for Lochinvar Knight boilers and A. O. Smith commercial units, it ensures accurate
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