This 2474 series diaphragm is technically identical to the legacy 21-842 part number

Optimized LP Performance: Specifically calibrated for 50

This genuine Amana-Goodman replacement part serves as the direct upgrade for legacy parts B1809927

Designed to optimize airflow distribution across heating and cooling coils

deactivate water feeders

Advanced Distributor Products 76734600 Transformer 320734-701 This 2474 series diaphragm isThe Advanced Distributor Products 76734600 Transformer is a high performance electrical component engineered specifically for residential and commercial heating and cooling systems. As a critical HVAC step down transformer, this OEM part efficiently converts a 120V primary input to a stable 24V secondary output, providing the necessary low voltage power to drive your systems control circuitry. With a 40VA power rating, it is perfectly sized to support