{"product_id":"aprilaire-620a-large-bypass-evaporative-humidifier","title":"AprilAire 620A Whole-House Large Bypass Evaporative Humidifier","description":"\u003cp\u003e\u003cstrong\u003eA high-efficiency whole-house large bypass evaporative humidifier engineered with water recirculation technology to reduce wastewater discharge.\u003c\/strong\u003e The AprilAire 620A delivers up to 18 gallons per day (GPD) of moisture distribution for homes up to 5,300 sq. ft. Built with an internal recirculation valve that continuously recycles water over the HydroCore™ evaporative cartridge, the 620A achieves up to 55% less wastewater compared to conventional bypass humidifiers. Equipped with the Model 62 Automatic Digital Humidifier Control and outdoor temperature sensor, the system dynamically modulates indoor relative humidity based on outdoor ambient winter conditions to protect architectural millwork and maintain comfort across Canadian heating seasons.\u003c\/p\u003e\n\u003ch2\u003eKey features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHydroCore™ water recirculation\u003c\/strong\u003e — internal valve recycles water over the evaporative cartridge, reducing wastewater by up to 55% while maintaining continuous panel saturation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic digital humidity control\u003c\/strong\u003e — includes Model 62 digital controller and outdoor temperature sensor to dynamically modulate indoor humidity and prevent window condensation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh evaporative capacity\u003c\/strong\u003e — delivers up to 18 gallons per day, providing comprehensive humidity coverage for residential layouts up to 5,300 sq. ft.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModular cartridge replacement\u003c\/strong\u003e — self-contained HydroCore™ cartridge simplifies annual maintenance and prevents mineral scale accumulation within the chassis.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReversible bypass duct collar\u003c\/strong\u003e — 6-inch round bypass duct collar mounts on either the left or right side of the unit for versatile mechanical room installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSizing guide\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eTight construction (modern building code, 0.5 ACH)\u003c\/th\u003e\n\u003ctd\u003eUp to 5,300 sq. ft. (492 m²)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eAverage construction (typical residential, 1.0 ACH)\u003c\/th\u003e\n\u003ctd\u003eUp to 2,600 sq. ft. (242 m²)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eLoose construction (older heritage structure, 1.5 ACH)\u003c\/th\u003e\n\u003ctd\u003eUp to 1,800 sq. ft. (167 m²)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eManufacturer\u003c\/th\u003e\n\u003ctd\u003eAprilAire\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eSeries\u003c\/th\u003e\n\u003ctd\u003e620 Series Evaporative Bypass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eModel \/ SKU\u003c\/th\u003e\n\u003ctd\u003e620A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eEquipment type\u003c\/th\u003e\n\u003ctd\u003eWhole-house bypass evaporative humidifier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eEvaporative capacity\u003c\/th\u003e\n\u003ctd\u003e18 Gallons Per Day (GPD) @ 120°F plenum temperature\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eCoverage (tight construction)\u003c\/th\u003e\n\u003ctd\u003eUp to 5,300 sq. ft. (492 m²)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eCoverage (average construction)\u003c\/th\u003e\n\u003ctd\u003eUp to 2,600 sq. ft. (242 m²)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eCoverage (loose construction)\u003c\/th\u003e\n\u003ctd\u003eUp to 1,800 sq. ft. (167 m²)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eWastewater reduction\u003c\/th\u003e\n\u003ctd\u003eUp to 55% less water discharge vs standard bypass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eControl included\u003c\/th\u003e\n\u003ctd\u003eModel 62 Automatic Digital Humidifier Control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eOutdoor temperature sensor\u003c\/th\u003e\n\u003ctd\u003eIncluded (digital proportional reset)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eReplacement water panel\u003c\/th\u003e\n\u003ctd\u003eHydroCore™ Cartridge (Model HYDRLH \/ HYDROL)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eBypass duct connection\u003c\/th\u003e\n\u003ctd\u003e6 in. round duct collar (reversible left or right)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePlenum opening dimensions\u003c\/th\u003e\n\u003ctd\u003e14-3\/4 in. W × 14-5\/16 in. H (375 × 364 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eUnit dimensions\u003c\/th\u003e\n\u003ctd\u003e15-5\/8 in. W × 15-7\/8 in. H × 10-1\/4 in. D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eElectrical rating\u003c\/th\u003e\n\u003ctd\u003e24 VAC, 60 Hz, 0.5 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eTransformer included\u003c\/th\u003e\n\u003ctd\u003e120 VAC to 24 VAC, 10 VA Class 2 Transformer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eWater feed connection\u003c\/th\u003e\n\u003ctd\u003e1\/4 in. O.D. copper tubing with compression fitting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eDrain hose connection\u003c\/th\u003e\n\u003ctd\u003e1\/2 in. I.D. flexible tubing to floor drain or pump\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eWater supply temperature\u003c\/th\u003e\n\u003ctd\u003eCold or service hot water (hot water recommended for heat pump applications)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eCertifications\u003c\/th\u003e\n\u003ctd\u003eUL rated, AHRI Guideline F compliant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eBefore you buy\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eRequires an existing or field-cut 14-3\/4 in. by 14-5\/16 in. opening on the warm air supply plenum or cold air return duct with 6-inch bypass ductwork connecting the opposing plenum.\u003c\/li\u003e\n\u003cli\u003eThe Model 62 Automatic Digital Control must be mounted on the cold air return duct at least 6 inches upstream of the bypass duct entry to sense representative indoor air humidity.\u003c\/li\u003e\n\u003cli\u003eThe outdoor temperature sensor must be installed on an exterior north- or east-facing wall out of direct sunlight using standard 18\/2 low-voltage wire.\u003c\/li\u003e\n\u003cli\u003eA continuous downward pitch must be maintained on the 1\/2-inch drain line to ensure free gravitational discharge and prevent winter freeze hazards.\u003c\/li\u003e\n\u003cli\u003eAnnual replacement of the HydroCore™ cartridge is recommended prior to each winter heating season to sustain peak evaporative efficiency.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eQuestions about plenum sizing or digital control integration? Contact our technical team for assistance.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\n\u003cdetails class=\"details\"\u003e\u003csummary\u003e\u003cstrong\u003eWhat is the HydroCore water panel and how does it work?\u003c\/strong\u003e\u003c\/summary\u003e\u003cdiv class=\"details-content\"\u003e\u003cp\u003eThe 620A features the HydroCore water panel (Model 35 replacement) engineered with an aluminum mesh honeycomb core and proprietary porous ceramic coating that distributes water evenly across the entire surface for optimal evaporative efficiency.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails class=\"details\"\u003e\u003csummary\u003e\u003cstrong\u003eWhat automatic control is included with the 620A?\u003c\/strong\u003e\u003c\/summary\u003e\u003cdiv class=\"details-content\"\u003e\u003cp\u003eThe 620A comes equipped with the AprilAire Model 62 automatic digital humidistat featuring an outdoor temperature sensor that automatically adjusts indoor humidity levels to prevent window condensation during cold weather.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails class=\"details\"\u003e\u003csummary\u003e\u003cstrong\u003eCan the 620A be installed on either supply or return ductwork?\u003c\/strong\u003e\u003c\/summary\u003e\u003cdiv class=\"details-content\"\u003e\u003cp\u003eYes. The unit can be mounted on either the warm air supply plenum or the cold air return drop with a 6-inch round bypass duct connecting to the opposite side.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails class=\"details\"\u003e\u003csummary\u003e\u003cstrong\u003eWhat electrical connection is required for the solenoid valve?\u003c\/strong\u003e\u003c\/summary\u003e\u003cdiv class=\"details-content\"\u003e\u003cp\u003eThe unit includes a 24 V AC electric water solenoid valve powered by the included 120 V to 24 V step-down transformer connected to the furnace board.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails class=\"details\"\u003e\u003csummary\u003e\u003cstrong\u003eWhat water supply line connects to the humidifier?\u003c\/strong\u003e\u003c\/summary\u003e\u003cdiv class=\"details-content\"\u003e\u003cp\u003eConnect a 1\/4-inch O.D. copper or braided stainless steel tubing line to the cold or hot water domestic supply pipe using the included shutoff valve.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails class=\"details\"\u003e\u003csummary\u003e\u003cstrong\u003eDoes the 620A have an integrated bypass damper?\u003c\/strong\u003e\u003c\/summary\u003e\u003cdiv class=\"details-content\"\u003e\u003cp\u003eYes. The unit features an integrated circular bypass damper knob with clear Summer (closed) and Winter (open) positions, eliminating the need for an external manual pipe damper.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails class=\"details\"\u003e\u003csummary\u003e\u003cstrong\u003eWhat drain line size is required?\u003c\/strong\u003e\u003c\/summary\u003e\u003cdiv class=\"details-content\"\u003e\u003cp\u003eA 1\/2-inch I.D. flexible drain hose must be routed from the bottom drain spud with continuous downward pitch to an open basement floor drain, laundry sink, or condensate pump.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails class=\"details\"\u003e\u003csummary\u003e\u003cstrong\u003eHow often should the Model 35 water panel be replaced?\u003c\/strong\u003e\u003c\/summary\u003e\u003cdiv class=\"details-content\"\u003e\u003cp\u003eReplace the Model 35 water panel once per heating season (annually in the fall) to maintain maximum evaporation and prevent lime and mineral blockage.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails class=\"details\"\u003e\u003csummary\u003e\u003cstrong\u003eCan hot domestic water be used to supply the humidifier?\u003c\/strong\u003e\u003c\/summary\u003e\u003cdiv class=\"details-content\"\u003e\u003cp\u003eYes. Supplying the unit with domestic hot water increases evaporative capacity and is recommended on heat pump systems where duct air temperatures are cooler.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003ch2\u003eDocuments\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/rp.widen.net\/content\/gulp3ae81p\/original\/aprilaire-620-series-humidifier-specification-sheet-406.pdf?u=5rn8it\" target=\"_blank\" rel=\"noopener\"\u003eAprilAire 620 Series Humidifier Engineering Specification Sheet (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/rp.widen.net\/content\/uw7plaiqy8\/original\/aprilaire-canada-all-products-specification-reference-guide-2258.pdf?u=5rn8it\" target=\"_blank\" rel=\"noopener\"\u003eAprilAire Canada All Products Specification Reference Guide (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/rp.widen.net\/content\/agonbbjzma\/original\/aprilaire-620-720-series-humidifier-owners-manual-10020114.pdf?u=5rn8it\" target=\"_blank\" rel=\"noopener\"\u003eAprilAire 620 \u0026amp; 720 Series Humidifier Owner's Manual (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003csmall\u003eSpecifications compiled from official AprilAire 620 Series Engineering Specification Sheet (Lit. No. 406) and 620\/720 Series Owner's Manual (10020114). All specifications subject to manufacturer verification. \u003ca href=\"https:\/\/rp.widen.net\/content\/gulp3ae81p\/original\/aprilaire-620-series-humidifier-specification-sheet-406.pdf?u=5rn8it\" target=\"_blank\" rel=\"noopener\"\u003eView AprilAire 620 specifications (PDF)\u003c\/a\u003e.\u003c\/small\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInstallation \u0026amp; Safety Notice:\u003c\/strong\u003e Evaporative humidifiers require proper mounting to forced-air HVAC ductwork, plumbing connection to a potable water line, and 24V control wiring. Professional installation by a qualified HVAC technician is recommended.\u003c\/p\u003e","brand":"AprilAire","offers":[{"title":"Automatic Digital Control (Model 62)","offer_id":53974506668326,"sku":"620A","price":389.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1039\/8521\/7830\/files\/aprilaire_620a_1_hero.jpg?v=1792998294","url":"https:\/\/avlshop.ca\/products\/aprilaire-620a-large-bypass-evaporative-humidifier","provider":"AVL Shop","version":"1.0","type":"link"}