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621679R Nordyne OEM 2-Stage 4-Pole Sequencer

621679R Nordyne OEM 2-Stage 4-Pole Sequencer

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621679R Nordyne OEM 2-Stage 4-Pole Sequencer

Product Overview

621679R is a genuine OEM Nordyne sequencer designed for multi-stage electric furnaces and heat kits. Its two control coils sequence four independent heating-element poles, energizing bank 1 on a first-stage heat call and all four poles on a second-stage call. The result is smooth, step-in load management that protects control transformers from overload and balances circuit currents for reliable, long-life operation.


Technical Specifications

Specification Detail
Control Voltage 24 VAC, 60 Hz
Load Voltage 240 VAC
Number of Stages 2
Number of Poles 4
Maximum Load per Pole 30 A at 240 VAC
Insulation Rating 600 VAC
Contact Type SPST automatic-reset
Coil Reset Automatic
Terminals Six ¼″ male quick-connect spade lugs
Mounting Board-mount flange
Housing Material Black phenolic resin
Net Weight 0.8 lb
Shipping Dimensions 10 × 12 × 12 in
Packaging Weight 10 oz


Cross-Reference Part Numbers

  • Nordyne OEM: 621679R

  • No documented superseded or alternate numbers


Compatibility

  • Nordyne and Nordyne-Miller electric furnaces employing multi-stage heating elements

  • Private-label air handlers and heat kits built to the same 2-stage, 4-pole sequencer footprint

  • Any 2-stage electric heat system requiring sequenced element staging for transformer protection and balanced current draw

Always verify your system’s control-voltage rating and sequencer mounting footprint before ordering.


Technician Notes

  1. De-energize all line and control-voltage power; follow lockout/tagout procedures.

  2. Remove the control-board cover and note existing sequencer wiring: photograph or label coil and load leads.

  3. Pull the old sequencer straight off the board-mount flange; disconnect all spade terminals.

  4. Position the new 621679R on the board-mount flange; engage mounting clips until it clicks.

  5. Reconnect coil (24 VAC) and load (240 VAC) spade leads to their original terminals, ensuring full seat on each lug.

  6. Restore 24 VAC control power; call first-stage heat and verify only the first two poles close.

  7. Call second-stage heat and confirm all four poles energize, then drop back as stages end.

  8. If sequencing is erratic, measure coil voltage under load, inspect contact surfaces for pitting, and verify element circuit currents.

Click to watch how a sequencer works ----> https://youtu.be/5YjL8eR5VJ0