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The 40003916-024 is technically identical to the 40003916-024/U model
Spring return mechanism ensures fail-safe operation
Key Benefits for Technicians: Direct OEM Replacement: Fully replaces legacy part numbers RLY20058
Normally Closed Safety: Provides a 2-way normally closed default state to prevent unintended fluid bypass during power loss
Lennox 17F56 Cold Header Box 322838-754 The 40003916-024 is technically identicalThe Lennox 17F56 Cold Header Box is a critical OEM component designed for high efficiency refrigerant distribution within Lennox evaporator and condenser coil assemblies. As a veteran technician knows, maintaining balanced thermal loading across multi circuit coils is essential for preventing localized freezing and ensuring the compressor operates within its designed superheat range. This HVAC cold header box serves as the primary manifold, routing
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