{"product_id":"lennox-lb-90182a-imc-g1-2-gas-valve-control-module-board-a58-cat-56k85-integrated-modular-control","title":"Lennox LB-90182A IMC G1-2 Gas Valve Control Module Board A58 | Cat # 56K85 | Integrated Modular Control","description":"\u003ch1\u003eLennox LB-90182A IMC G1-2 Gas Valve Control Module Board A58 | Cat # 56K85 | Integrated Modular Control\u003c\/h1\u003e\n\u003cp\u003eThe \u003cstrong\u003eLennox LB-90182A (Cat # 56K85)\u003c\/strong\u003e serves as the high-level \"brain\" for commercial rooftop units, specifically functioning as the \u003cstrong\u003eA58 Gas Valve Control Module\u003c\/strong\u003e within the Integrated Modular Control (IMC) system. This \u003cstrong\u003eOEM-focused\u003c\/strong\u003e G1-2 generation board is responsible for the precise sequencing of the gas valves, ignition, and flame sensing circuits. Engineered for \u003cstrong\u003eLennox L-Series and S-Class commercial units\u003c\/strong\u003e, this module translates commands from the main M1 board into mechanical heating actions. By replacing a faulty A58 module, you restore the system's ability to communicate between the \"body\" of the burners and the central IMC intelligence, ensuring safe combustion and preventing mid-winter heating lockouts.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenuine Lennox IMC G1-2 Logic:\u003c\/strong\u003e Specifically engineered for part number \u003cstrong\u003eLB-90182A\u003c\/strong\u003e, maintaining factory-standard ignition timing and gas valve modulation for commercial L-Series units.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated Gas Valve Management:\u003c\/strong\u003e Actively monitors the A58 circuit to fix issues with failed ignition attempts, intermittent gas valve drops, or \"no-spark\" conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdvanced Flame Rectification:\u003c\/strong\u003e Features high-sensitivity circuitry to resolve nuisance flame failure codes, ensuring the \"brain\" accurately detects a safe burner flame.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Communication Bridge:\u003c\/strong\u003e Provides seamless integration with the IMC M1 master controller, allowing for remote diagnostics and clear error reporting via the system's digital display.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety Protocol Monitoring:\u003c\/strong\u003e Continuously scans the heating loop for limit trips and pressure switch fluctuations, shutting down the gas train instantly if a hazard is detected. \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Lennox\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Lennox Industries\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart #:\u003c\/strong\u003e LB-90182A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCatalog #:\u003c\/strong\u003e 56K85\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGeneration:\u003c\/strong\u003e IMC G1-2 (Integrated Modular Control)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModule Type:\u003c\/strong\u003e A58 Gas Valve Control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.95 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 24 VAC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Commercial Gas\/Electric Rooftop Units \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e🛠️ HVAC Depot Pro Tip\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eTake a Picture First:\u003c\/strong\u003e Before disconnecting the multi-pin plugs or the spark ignition wire, photograph the board's orientation and terminal assignments. On IMC systems, the A58 board is often mounted in close proximity to other modules; a photo ensures you don't cross-wire the communication bus. Conduct a \u003cstrong\u003ediagnostic check\u003c\/strong\u003e by viewing the M1 master board's display for \"ECTO\" codes after installation to ensure the new 56K85 is being recognized by the network. Always ensure the ground connection to the burner tray is clean and tight, as a poor ground is the primary cause of flame-sensing errors on this module. \u003c\/p\u003e\n\u003ch2\u003eCross-Reference\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuperseded \/ Legacy:\u003c\/strong\u003e 56K8501, 10M52, 97L48, LB-90182\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrawing Numbers:\u003c\/strong\u003e 100467-01, 100467-03\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhite-Rodgers\/Emerson Equivalents:\u003c\/strong\u003e 50A62-120 (OEM Specific)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Equivalents:\u003c\/strong\u003e A58 Module, IMC G1 Generation 2\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eModel Compatibility\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLennox L-Series\u003c\/strong\u003e (Suffixes: LGA036, LGA042, LGA048, LGA060, LGA072, LGA090, LGA102, LGA120, LGA150)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLennox S-Class\u003c\/strong\u003e (Suffixes: SGA036, SGA060, SGA090, SGA120)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLennox Landmark\u003c\/strong\u003e (Suffixes: LEA036, LEA048, LEA060)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLennox GCS Series\u003c\/strong\u003e (Suffixes: GCS24, GCS16 - check serial range)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":52237929251179,"sku":"66255116090","price":211.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0922\/9683\/9531\/files\/LB-90182A.jpg?v=1771964305","url":"https:\/\/tophvacparts.com\/products\/lennox-lb-90182a-imc-g1-2-gas-valve-control-module-board-a58-cat-56k85-integrated-modular-control","provider":"HVAC Parts and Equipment Depot Open To Homeowners and Contractors","version":"1.0","type":"link"}