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As a critical combustion assembly component
this brass boiler relief valve provides a 510
0570 orifice
this submaster controller allows for both Direct Acting (DA) and Reverse Acting (RA) configurations
Lennox 23X17 Control Board 30067439-890 As a critical combustion assemblyThe Lennox 23X17 Control Board, also identified as the Lennox 620244 02, is an essential demand defrost control designed for high performance heat pump systems. Built to replace previous iterations such as the LEN620244 02, this board integrates multiple critical functions into a single 24V module, including demand defrost logic, a defrost relay, and an anti short cycle timed off control. It features a sophisticated pressure switch system lockout
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