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621709R Nordyne 240 VAC primary 24vac sec 40VA Transformer

621709R Nordyne 240 VAC primary 24vac sec 40VA Transformer

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621709R Nordyne 240 VAC primary 24vac sec 40VA Transformer

Product Overview

The Nordyne 621709R control transformer provides stable low-voltage power for residential HVAC systems. As a direct-fit OEM replacement, it delivers consistent 24 VAC output to safety controls, thermostats, and relays, ensuring reliable operation and system protection.

Key features:

  • 240 VAC primary input for standard residential power

  • 24 VAC secondary output rated at 40 VA

  • Compact design with dual mounting tabs for quick installation

  • High-grade laminations minimize heat, noise, and energy loss


Technical Specifications

Specification Detail
Primary voltage 240 VAC ± 10 % @ 60 Hz
Secondary voltage 24 VAC ± 5 %
Power rating 40 VA nominal
Frequency 60 Hz
Terminals Screw-type barrier strip
Insulation class Class B (130 °C)
Mounting Dual stamped mounting tabs
Dimensions (L×W×H) 3.4 × 2.2 × 2.0 in (86 × 56 × 51 mm)
Weight 1.2 lb (0.54 kg)


Cross-Reference Part Numbers

  • Nordyne 621709R

  • Coleman 621709R

  • Neuco T-24002 (40 VA)

  • OEM equivalent for Bosch-era control panels


Compatibility

  • Nordyne/Coleman residential furnaces and air handlers

  • Bryant 310A/320A and Payne 355A series control boards

  • Carrier/Bryant 24 VAC systems requiring a 40 VA transformer

  • American Standard N5 and P6 heat pump series

  • Any HVAC control panel designed for 24 VAC @ 40 VA


Technician Notes

  • Always disconnect all power before servicing the transformer.

  • Verify secondary voltage under load with a true-RMS meter to ensure proper output.

  • Mount firmly on a clean, vibration-free surface using the provided tabs.

  • Strip wires cleanly and torque terminal screws to manufacturer’s spec to prevent arcing.

  • Keep clearances around the transformer for ventilation and heat dissipation.

  • Carry a spare 621709R on service calls to minimize customer downtime.

Ensure stable low-voltage control with the Nordyne 621709R Transformer, a genuine OEM component designed for seamless integration into Nordyne, Intertherm, and other Nortek HVAC systems. This 240V primary to 24V secondary transformer delivers 40VA of reliable power across 50/60Hz, making it ideal for furnace and air handler control circuits.

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📦 Applications: Used in electric furnaces, air handlers, and packaged units requiring consistent low-voltage output for thermostats, relays, and control boards.

💡 Why OEM Matters: Genuine Nordyne parts like the 622762R ensure compatibility, safety, and long-term durability—no guesswork, no rewiring.


Replaces 621709R, 622762R