[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-662343-105":3,"detail-sidebar-cat-0-en-105":84,"doc-detail-662343-en":134},{"code":4,"msg":5,"data":6},0,"ok",{"site_id":7,"language":8,"slug":9,"title":10,"keywords":11,"description":12,"schema_data":13,"social_meta":77,"head_meta":79,"extra_data":81,"updated_unix":83},105,"en","refrigerant-piping-design-and-fabrication-guidelines-application-and-design-guidelines","Refrigerant Piping Design and Fabrication Guidelines - Application and Design Guidelines","","Refrigerant piping design for air conditioning systems determines performance, reliability, and installed cost by influencing capacity, efficiency, oil management, refrigerant charge, sound level, liquid refrigerant control, and modulation effectiveness. The manual provides generally accepted safe engineering practices and explains how piping choices affect system behavior, with guidance for typical short-line installations and careful sizing for long lines and elevation differences. It specifies design intent, code compliance requirements, and safety-referenced standards, along with installation-related limits.",{"@graph":14,"@context":76},[15,34,55],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/technology/","Technology",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/refrigerant-piping-design-and-fabrication-guidelines-application-and-design-guidelines/662343/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/refrigerant-piping-design-and-fabrication-guidelines-application-and-design-guidelines/662343.png","ImageObject",300,407,{"name":42,"@type":43},"Mimi","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-10-30","2026-10-28",true,{"@type":52,"interactionType":53,"userInteractionCount":33},"InteractionCounter",{"@type":54},"ViewAction",{"@type":56,"mainEntity":57},"FAQPage",[58,64,68,72],{"name":59,"@type":60,"acceptedAnswer":61},"Why does refrigerant piping design affect air conditioning system performance?","Question",{"text":62,"@type":63},"Piping design impacts capacity and efficiency, reliability, oil management and refrigerant charge, sound level, liquid refrigerant control, modulation effectiveness, and overall cost. These factors determine how well the system operates after installation.","Answer",{"name":65,"@type":60,"acceptedAnswer":66},"What are the key piping length and lift limits for HFC-410A cooling systems?",{"text":67,"@type":63},"For HFC-410A, total equivalent length is limited to 240 feet, with a maximum linear (actual) length of 200 ft and maximum linear liquid lift of 60 ft. The maximum vapor riser length is 125 ft, and additional requirements apply as line length increases.",{"name":69,"@type":60,"acceptedAnswer":70},"When are crankcase heaters and non-bleed port TXVs required for long runs?",{"text":71,"@type":63},"For HFC-410A, crankcase heater plus non-bleed port TXV are required for 51–80 linear feet (with certain vertical constraints for alternatives) and are required for 81–200 linear feet. Over 200 linear feet is not recommended.",{"name":73,"@type":60,"acceptedAnswer":74},"What TXV considerations are specified in the manual?",{"text":75,"@type":63},"A factory installed indoor non-bleed, non-adjustable TXV can be used if it maintains superheat lower than 25°F at the outdoor unit service valve. If the indoor unit lacks a suitable factory TXV, the manual directs replacement with specified non-bleed adjustable thermostat expansion valves and notes that superheat adjustment follows TXV instructions.","https://schema.org",{"og:url":32,"og:type":78,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":80,"canonical":32},"index,follow",{"doc_id":82,"site_id":7},662343,1793212263,{"code":4,"msg":85,"data":86},"success",[87,91,95,99,104,108,113,118,123,126,130],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":88,"show_sort_weight":89,"slug":90},"Story & Novel",90,"story-novel",{"id":26,"doc_module":4,"doc_module_name":25,"category_name":92,"show_sort_weight":93,"slug":94},"Literature",80,"literature",{"id":33,"doc_module":4,"doc_module_name":25,"category_name":96,"show_sort_weight":97,"slug":98},"Exam",70,"exam",{"id":100,"doc_module":4,"doc_module_name":25,"category_name":101,"show_sort_weight":102,"slug":103},5,"Comic",60,"comic",{"id":105,"doc_module":4,"doc_module_name":25,"category_name":29,"show_sort_weight":106,"slug":107},6,50,"technology",{"id":109,"doc_module":4,"doc_module_name":25,"category_name":110,"show_sort_weight":111,"slug":112},7,"Healthcare",40,"healthcare",{"id":114,"doc_module":4,"doc_module_name":25,"category_name":115,"show_sort_weight":116,"slug":117},8,"Research & Report",30,"research-report",{"id":119,"doc_module":4,"doc_module_name":25,"category_name":120,"show_sort_weight":121,"slug":122},9,"Religion & Spirituality",20,"religion-spirituality",{"id":121,"doc_module":4,"doc_module_name":25,"category_name":124,"show_sort_weight":121,"slug":125},"World Cup","world-cup",{"id":127,"doc_module":4,"doc_module_name":25,"category_name":128,"show_sort_weight":127,"slug":129},10,"Lifestyle","lifestyle",{"id":131,"doc_module":4,"doc_module_name":25,"category_name":132,"show_sort_weight":100,"slug":133},19,"General","general",{"code":4,"msg":85,"data":135},{"doc_id":82,"user_id":136,"nickname":42,"user_avatar":137,"doc_module":4,"category_id":105,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":138,"file_id":139,"file_url":140,"file_type":141,"file_size":142,"view_count":33,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":143,"language":144,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":145,"faqs":146,"seo_title":147,"seo_description":12,"update_tm":83,"read_time":148},2336477974920,"https://ap-avatar.wpscdn.com/davatar_155a257f0dc6eb9ab79c44ca47cae57d","APPLICATION AND DESIGN GUIDELINES  \nLennox Refrigerant Piping DESIGN AND FABRICATION GUIDELINES  \nCorp. 9351 − L9 February 25, 2008  \nIntroduction ............................... Page 1  \nPiping Limits .............................. Page 2  \nLiquid Line Quick Select .................... Page 4  \nVapor Line Quick Select .................... Page 5  \nLong Line Requirements .................... Page 5  \nFundamentals and Theory .................. Page 8  \nLine Sizing in Detail ........................ Page 10  \nSystem Control ........................... Page 27  \nSystem Operation ......................... Page 28  \nAppendix ................................. Page 29  \nGlossary .................................. Page 39  \nIntroduction  \nThe piping design of any air conditioning system will affect the performance, reliability, and applied cost of that system. The design of refrigerant piping systems involves capacity and efficiency, reliability, oil management, refrigerant charge, sound level, liquid refrigerant control, modulation effectiveness and cost. Therefore it is essential that the installing contractor understand the effect of piping and be able to make intelligent decisions in order to do the best job possible on the installation. This material below will clearly explain the basic effects on system performance of the piping design.  \nIn most typical installations with lines less than 50 feet, the line sizes will match up to the connections on the outdoor unit. However, with installations involving long line sets or elevation differences between the outdoor unit and the indoor unit, the piping must be sized carefully. System performance may be improved even in a typical installation by optimizing pipe sizes.  \nThe intent of this manual is to represent generally accepted safe engineering practices. Specifications and limits outlined in this manual are subject to change. System design should conform to all codes, laws and regulations applying atthe site at the time of installation. Additional documents that should be followed include The Safety Code for Mechanical Refrigeration and the Code for Refrigeration Piping, both available from ASHRAE. In addition, the procedures and limits outlined in this manual do not supersede local, state or national codes under any circumstances.  \nPage 1 © 2006 Lennox Industries Inc.  \nPiping limits  \nCooling System HFC−410A  \nTotal equivalent length = 240 feet (Piping & all fittings, etc)  \nNOTE − Length is general guide. Lengths may be more or less, depending on remaining system design factors.  \nMaximum linear (actual) length = 200 ft  \nMaximum linear liquid lift = 60 ft.  \nNOTE − Maximum lifts are dependent on total length, number of elbows, etc that contribute to total pressure drop.  \nMaximum length vapor riser = 125 feet  \nUp to 50 feet: use rated line sizes listed in unit specifications or installation instructions  \n51 to 80 linear feet: Crankcase heater required, non−bleed port TXV (see TXV note below) preferred (RFCIV acceptable with maximum vertical of 25 feet)  \n81 − 200 linear feet: Crankcase heater and non−bleed port TXV (see TXV note below) required Over 200 linear feet: not recommended  \nTXV NOTE:  \na) Indoor Factory Installed non−bleed, non−adjustable TXV can be used on the system if it can maintain superheat lower than 25°F at outdoor unit service valve. (Superheat is critical to compressor operating conditions)  \nb) If indoor unit does not have a factory installed TXV, factory installed TXV needs replacing due to system match up or the factory TXV is not capable of maintaing low enough superheats, use the following valves: 2 ton − Y0498−01, 3 ton − Y049901, 4 ton − Y0500−01, 5ton − Y0501−01, 6 ton − T502−01 are indoor non−bleed adjustable thermostat expansion valves. (Superheat adjustment can be found in instructions with TXV)  \nIf not factory provided, high and low pressure switches are recommended  \nIf not factory provided, a liquid line filter drier is required  \nFor HFC−4","cbCaiv00VSmpkDBS","https://ap.wps.com/l/cbCaiv00VSmpkDBS","pdf",530361,41,"English","# Introduction\n# Piping Limits\n## Cooling System HFC-410A\n## Cooling System HCFC-22\n## TXV Notes and Required Components","[{\"question\":\"Why does refrigerant piping design affect air conditioning system performance?\",\"answer\":\"Piping design impacts capacity and efficiency, reliability, oil management and refrigerant charge, sound level, liquid refrigerant control, modulation effectiveness, and overall cost. These factors determine how well the system operates after installation.\"},{\"question\":\"What are the key piping length and lift limits for HFC-410A cooling systems?\",\"answer\":\"For HFC-410A, total equivalent length is limited to 240 feet, with a maximum linear (actual) length of 200 ft and maximum linear liquid lift of 60 ft. The maximum vapor riser length is 125 ft, and additional requirements apply as line length increases.\"},{\"question\":\"When are crankcase heaters and non-bleed port TXVs required for long runs?\",\"answer\":\"For HFC-410A, crankcase heater plus non-bleed port TXV are required for 51–80 linear feet (with certain vertical constraints for alternatives) and are required for 81–200 linear feet. Over 200 linear feet is not recommended.\"},{\"question\":\"What TXV considerations are specified in the manual?\",\"answer\":\"A factory installed indoor non-bleed, non-adjustable TXV can be used if it maintains superheat lower than 25°F at the outdoor unit service valve. If the indoor unit lacks a suitable factory TXV, the manual directs replacement with specified non-bleed adjustable thermostat expansion valves and notes that superheat adjustment follows TXV instructions.\"}]","Refrigerant Piping Design and Fabrication Guidelines - Application and Design Guidelines | PDF",103]