{"product_id":"westinghouse-903915a-air-handler-control-board","title":"Westinghouse 903915A Air Handler Control Board","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe WESTINGHOUSE 903915A is a replacement control board designed for variable speed indoor air handler units. It serves as the main electronic control interface, managing blower motor operation, thermostat signal processing, and system sequencing within the air handler cabinet. This board is a direct OEM-style replacement intended for installation by licensed HVAC technicians servicing residential variable speed air handler systems. It governs the communication between the low-voltage thermostat inputs and the ECM blower motor drive, making correct identification of the compatible unit essential before ordering.\u003c\/p\u003e\n\u003cp\u003eThis control board is used in variable speed indoor air handler applications, specifically in B4VM and B4VM-B series units. Compatible part numbers include B4VM-036K-C, B4VM-048K-C, B4VM-060K-C, and B4VM-B-X48K-CB. These are typically residential split-system air handlers installed in conditioned or semi-conditioned spaces, paired with a remote condensing unit. The board is mounted inside the air handler cabinet and interfaces with the ECM motor, thermostat wiring, and safety controls.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect replacement control board for B4VM and B4VM-B series variable speed air handlers\u003c\/li\u003e\n  \u003cli\u003eCompatible with multiple tonnage configurations including 036K, 048K, and 060K units\u003c\/li\u003e\n  \u003cli\u003eDesigned to interface with ECM blower motor and low-voltage thermostat controls\u003c\/li\u003e\n  \u003cli\u003eOEM-style fit reduces retrofit time and eliminates field modification\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use with WESTINGHOUSE variable speed air handler models B4VM-036K-C, B4VM-048K-C, B4VM-060K-C, and B4VM-B-X48K-CB in the B4VM and B4VM-B series.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a licensed HVAC technician. Disconnect all power to the air handler at the disconnect switch and verify zero voltage with a meter before removing the existing board. Handle the control board carefully to avoid electrostatic discharge damage to onboard components. Reconnect all low-voltage and line-voltage wiring according to the existing harness layout and verify operation through a full system cycle after installation.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eItem Type\u003c\/strong\u003e: Control Board\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication\u003c\/strong\u003e: Variable Speed Air Handler\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible Model Series\u003c\/strong\u003e: B4VM, B4VM-B\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible Part Numbers\u003c\/strong\u003e: B4VM-036K-C, B4VM-048K-C, B4VM-060K-C, B4VM-B-X48K-CB\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: WESTINGHOUSE\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 903915A\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"WESTINGHOUSE","offers":[{"title":"Default Title","offer_id":51284057325874,"sku":"903915A","price":109.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/309278108.jpg?v=1781067382","url":"https:\/\/voomisupply.com\/products\/westinghouse-903915a-air-handler-control-board","provider":"Voomi Supply","version":"1.0","type":"link"}