624677R Nordyne ECM BOARD
624677R Nordyne ECM BOARD
Description
The 624677R is a genuine OEM ECM control board engineered to manage electronically commutated blower motors in Nordyne, Coleman, Intertherm, and Miller HVAC systems. It delivers precise, variable-speed airflow control by processing 24 VAC input signals and driving the ECM motor’s internal inverter. This board enhances system efficiency, reduces noise, and provides self-diagnostics for quick fault isolation.
Key Features
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Official Nordyne part number 624677R
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Onboard microprocessor with variable-speed airflow algorithms
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Direct 24 VAC control-voltage input; no external run capacitor required
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Plug-and-play, keyed connectors for ECM motor harness
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Conformal-coated PCB and corrosion-resistant terminals for durability
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Integrated fault-code LED for status and error reporting
Compatibility
| Original Part No. | Replacement Part No. | Typical Applications |
|---|---|---|
| 624677 | 624677R | M4ECM, M6ECM, M7ECM series furnaces and air handlers |
| — | 624677R | ECM-equipped packaged heat pumps and rooftop units |
Always verify your unit’s data plate and ECM motor code before ordering to ensure compatibility.
Installation & Service Tips
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Power Down: Disconnect all 24 VAC control power before servicing to avoid board damage.
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Document Wiring: Photograph or label each connector to ensure accurate reconnection.
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Board Mounting: Use OEM standoffs or mounting posts; avoid over-torquing screws.
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Input Verification: Measure ~24 VAC at the board’s input terminals before plugging in the motor harness.
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Commissioning: Run through all fan speed profiles; observe LED indicators and check airflow against specifications.