{"product_id":"micro-air-400-io-control-board-marine-air-passport-i-o-replacement","title":"Micro-Air 400-IO Control Board – Marine Air Passport I\/O Replacement","description":"\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eMicro-Air 400-IO Control Board\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is a newly redesigned, drop-in replacement for compatible \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eMarine Air Systems® \/ Dometic® Passport I\/O marine HVAC control boards\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. It is backward-compatible with legacy Passport I\/O systems and designed to fit existing electrical boxes in supported applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe 400-IO replaces legacy boards with serial numbers beginning in \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e372 or 400\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and is designed to retain the original system’s display and sensor functionality while using a modern replacement board.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eProduct Features:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBrand:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Micro-Air\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eProduct:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 400-IO Control Board\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eStandard Board Part Number:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e ASY-400-X02\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eApplication:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Marine HVAC\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eReplacement For:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Marine Air Systems® \/ Dometic® Passport I\/O\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eReplaces Dometic Part Number:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 4220020\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eLegacy Serial Number Compatibility:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 372 or 400 Prefix\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBoard Markings:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e PCB-372 or PCB-400\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eDisplay Interface:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 8-Pin\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSensor Connections:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Three Sensor Jacks\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eReplacement Type:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Newly Manufactured Drop-In Replacement\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eLegacy Compatibility:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Backward-Compatible with Supported Passport I\/O Systems\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAvailable Configurations:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Standard Board, EasyStart-Equipped Board, or Board in Metal Enclosure\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eReplacement for Passport I\/O Controls\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe 400-IO is designed as a fully compatible replacement for supported \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ePassport I\/O control boards\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e used in Marine Air Systems equipment. Although board layout and individual components changed throughout the production life of the original controls, compatible boards can typically be identified by a nine-digit serial number beginning with \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e372 or 400\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e or by the markings \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ePCB-372\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e or \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ePCB-400\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e on the circuit board.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCompatible original boards also use three sensor jacks, one 8-pin display jack, and a consistent terminal-block output arrangement.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eAvailable Configurations\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eASY-400-X02 – Standard Board Only\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eASY-400-P08 – Board with EasyStart Daughterboard\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eASY-400-X03 – Standard Board in Metal Enclosure\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eDisplay Compatibility\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe 400-IO is compatible with select \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eMicro-Air EasyTouch OEM, 402-IO, and 402-IO Compact displays\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, as well as supported \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eMarine Air Passport I\/O, Passport I\/O Compact, and Passport Elite displays\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eAdditional Legacy System Replacement\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe 400-IO platform can also be used when converting certain older \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ePassport II, ECU, or Cabin Mate\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e systems. Depending on the original equipment, replacement may require the 402-IO display, an enclosure, or other components rather than simply replacing the control board alone.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eImportant Compatibility Information\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eSome early Passport I\/O systems included a heat relay that was not commonly used. If the existing system actively uses that heat relay, Micro-Air specifies the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eUnity Control Board ASY-501-09-BL with an external heater triac\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e instead of the standard 400-IO.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBoards with serial or board numbers beginning with \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e300 or 310\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e may belong to Passport II or other earlier systems and should not automatically be replaced with a 400-IO without confirming the required conversion components.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePlease contact us with your existing board number, serial number, equipment model, and photos if you need assistance confirming compatibility before purchase.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e","brand":"Micro-Air","offers":[{"title":"w\/EasyStart Daughterboard (-P08)","offer_id":67626850844781,"sku":null,"price":479.99,"currency_code":"USD","in_stock":true},{"title":"Standard Board Only (-X02)","offer_id":67626850877549,"sku":null,"price":579.99,"currency_code":"USD","in_stock":true},{"title":"Standard Board - Metal Enclosure (-X03)","offer_id":67626850910317,"sku":null,"price":589.99,"currency_code":"USD","in_stock":true},{"title":"w\/CAN Bus \u0026 DC Blower Daughterboard (-X02-DC)","offer_id":67626850943085,"sku":null,"price":589.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0637\/2419\/1853\/files\/ASY-400-P08_1024x1024_2x_4085b027-a40a-46e4-a379-5cbdf5b9ba7c.jpg?v=1791073902","url":"https:\/\/willardshvacsupply.com\/products\/micro-air-400-io-control-board-marine-air-passport-i-o-replacement","provider":"Willard's HVAC Supply","version":"1.0","type":"link"}