What are the specs for this Compressor?

The correct replacement for Lennox model OEM Lennox Scroll Compressor 81,500 BTU 460V — 78M50 is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Lennox equipment which lists the model number OEM Lennox Scroll Compressor 81,500 BTU 460V — 78M50.

What symptoms indicate I need a new compressor?

Common symptoms that indicate you need a new compressor include unusual noises, intermittent operation, complete failure to operate, or visible damage. For specific diagnostic guidance, visit nationalhvacparts.com/pages/hvac-diagnostic.

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Lennox

OEM Lennox Scroll Compressor 81,500 BTU 460V — 78M50

Name: OEM Lennox Scroll Compressor 81,500 BTU 460V — 78M50
Brand: Lennox
SKU: LNX-78M50
Price: 389.95 USD
Availability: InStock

SKU: LNX-78M50 Brand: Lennox

$389.95 $529.95

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The genuine OEM Lennox 78M50 is a Copeland ZR81KC-TFD-830 scroll compressor rated at 81,500 BTUH, 460V, R-22 refrigerant, 3-phase. Scroll compressors use two interleaved spiral scrolls to compress refrigerant smoothly and efficiently, delivering quieter operation and greater reliability than reciprocating designs. This compressor is built to Lennox factory specifications so your commercial or residential system maintains its rated cooling capacity and efficiency.

Common failure symptoms include no cooling from the outdoor unit, the compressor tripping the breaker on startup, loud grinding or metallic noises, short-cycling, elevated amp draw, and a unit that hums but won't start. Scroll failures frequently trace back to electrical faults, contactor issues, or lost lubrication.

Why OEM matters: The genuine Lennox 78M50 ensures the correct tonnage, voltage, and refrigerant compatibility for your equipment. Non-OEM alternatives risk capacity mismatch, oil incompatibility, and voided warranty coverage. Have a licensed HVAC professional handle installation and system evacuation. In stock and ships same day when ordered before the daily cutoff.

Shipping Information

Orders placed before 3PM CST ship same business day
Standard delivery: 2-5 business days
Express shipping available at checkout
Free shipping on orders over $75
Tracking number emailed upon shipment

Return Policy

30-day returns on unused parts in original packaging
Electrical parts (capacitors, contactors, control boards) are final sale once installed
Email info@nationalhvacparts.com to initiate a return
Refunds processed within 5-7 business days

OEM Lennox Scroll Compressor 81,...

$389.95

Frequently Asked Questions

Does this Compressor fit my Lennox OEM Lennox Scroll Compressor 81,500 BTU 460V — 78M50?

Yes. This is the factory-specified OEM compressor for the Lennox OEM Lennox Scroll Compressor 81,500 BTU 460V — 78M50. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.

How do I replace the compressor on my Lennox OEM Lennox Scroll Compressor 81,500 BTU 460V — 78M50?

Refer to your equipment service manual for model-specific steps. General approach: turn off power, photograph connections, remove old part, install new part, restore power and test. For gas components, hire a licensed technician. Email info@nationalhvacparts.com for guidance.

What symptoms mean I need a new compressor?

Common symptoms: unusual noises, intermittent operation, complete failure, or visible damage. Visit our diagnostic hub for symptom-based troubleshooting.

Is this compressor compatible with Bryant or Payne too?

Many Lennox parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.

Should I use OEM or aftermarket for my Lennox compressor?

OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.

How fast does National HVAC Parts ship?

Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.

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OEM Lennox Scroll Compressor 81,500 BTU 460V — 78M50

Shipping Information

Return Policy

Frequently Asked Questions