621807R Nordyne 120V-PRI 24V-SEC 30VA TRANSFORMER Normal Stock Item 621807R Nordyne 30 VA Vertical Quick-Connect Transformer Product Overview 621807R is a genuine OEM Nordyne control transformer rated 30 VA, with a 120 VAC primary and 24 VAC secondary. It features a vertical quick-connect spade terminal design for fast, reliable replacement and provides stable control power for furnaces, air handlers, and other Nordyne HVAC equipment. Technical Specifications Specification Detail Primary Voltage 120 VAC, 60 Hz Secondary Voltage 24 VAC, 60 Hz Power Rating 30 VA Secondary Current 1.25 A Mounting Vertical quick-connect orientation Terminals Four 1/4″ male quick-connect spades (2 primary, 2 secondary) Insulation Class B (typical) Operating Temperature –40 °F to 140 °F (typical) Approximate Weight 0.6 lb Cross-Reference Part Numbers OEM Part Number Description 621807R Nordyne 30 VA 120 VAC ➔ 24 VAC Transformer — No documented superseded or alternate numbers Compatibility Compatible with furnaces and air handlers from Nordyne, Nordyne Miller, Frigidaire, Maytag, White-Westinghouse, Tappan, Intertherm, Kelvinator, Gibson, GrandAire, Philco, Garrison, Mammoth, and Medallion that require a 30 VA, 120 VAC ➔ 24 VAC control transformer. Also fits private-label and Partners Choice branded units built to the same specification. Technician Notes De-energize all power at the service switch; lock out/tag out before servicing. Photograph or label existing transformer connections on the control board. Pull old transformer off by sliding spade terminals straight off the quick-connect lugs. Mount the new 621807R transformer vertically, aligning its spade terminals with the board harness. Reattach primary and secondary leads to their original terminals; ensure secure, corrosion-free connections. Restore power and measure secondary voltage with a multimeter; verify approximately 24 VAC with no load. Initiate a system call for heat or cool and confirm all control circuits receive stable 24 VAC and operate without fault indicators.
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