What are the specs for this Control Board?

The correct replacement for Lennox model OEM Lennox IMC BACnet Replacement Kit (BP1-1) — 39W75 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 IMC BACnet Replacement Kit (BP1-1) — 39W75.

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OEM Lennox IMC BACnet Replacement Kit (BP1-1) — 39W75

Name: OEM Lennox IMC BACnet Replacement Kit (BP1-1) — 39W75
Brand: Lennox
SKU: LNX-39W75
Price: 39.95 USD
Availability: InStock

SKU: LNX-39W75 Brand: Lennox

$39.95 $54.95

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The genuine OEM Lennox 39W75 IMC BACnet Replacement Kit (BP1-1, factory reference 101684-01) provides the BACnet communication interface for Lennox Integrated Modular Controls (IMC) used on compatible rooftop and commercial HVAC units. This kit lets your Lennox equipment communicate over a BACnet network, so a building automation system (BAS) can monitor operation, read sensors, and issue setpoint and mode commands across the facility.

Common failure symptoms include loss of BACnet communication between the unit and the building management system, controls that no longer respond to remote commands, missing or frozen data points at the BAS front end, network fault or offline alarms, and the unit reverting to standalone local control. When integration drops out, this interface kit is a frequent culprit.

Why OEM matters: The 39W75 is programmed and configured to match Lennox IMC protocols and object mapping exactly, ensuring seamless plug-and-play integration with your existing controls and BAS. Generic BACnet gateways require extra configuration and may not map Lennox-specific objects correctly. Choosing the genuine Lennox kit restores reliable, factory-supported network communication and keeps your building automation running as designed.

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 IMC BACnet Replacemen...

$39.95

Frequently Asked Questions

Does this Control Board fit my Lennox OEM Lennox IMC BACnet Replacement Kit (BP1-1) — 39W75?

Yes. This is the factory-specified OEM control board for the Lennox OEM Lennox IMC BACnet Replacement Kit (BP1-1) — 39W75. 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 control board on my Lennox OEM Lennox IMC BACnet Replacement Kit (BP1-1) — 39W75?

Difficulty: Advanced (1–2 hrs)
Step 1: Turn off breaker. Step 2: PHOTOGRAPH all wire connections before touching anything. Step 3: Label each wire with tape. Step 4: Disconnect all wires, remove old board. Step 5: Mount new board, reconnect all wires matching your photo exactly. Step 6: Restore power and test all modes. Exact part number match is critical.

My HVAC system is completely dead. What could be wrong?

Completely dead HVAC (no LED on board) = failed control board or blown fuse. Check board fuse first (3A or 5A, costs $1–$5). If fuse is good and board has power but no LED, board is dead. Always photograph wiring before replacing.

Is this control board 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 control board?

OEM essential. Control boards are model-specific with precise firmware and connector layouts. Aftermarket boards rarely match all functions and can cause intermittent failures or safety issues. Always match the exact OEM part number.

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 IMC BACnet Replacement Kit (BP1-1) — 39W75

Shipping Information

Return Policy

Frequently Asked Questions