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The content provides safety precautions before and during repair work, including power disconnection and ventilation, and warns against hazards from electricity, refrigerant contact, and hot/cold areas. It specifies precautions for new R410A refrigerant, emphasizing clean, contamination-free piping, correct materials and oils, proper vacuum procedures, and use of designated R410A-only tools and refrigerant handling practices.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":35,"@type":76,"position":81},"https://docshare.wps.com/document/healthcare/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/split-type-heat-pump-air-conditioners-hfc-r410a-no-och730-revised-edition-a-technical-service-manual/640315/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/split-type-heat-pump-air-conditioners-hfc-r410a-no-och730-revised-edition-a-technical-service-manual/640315.png","ImageObject",300,407,{"name":92,"@type":93},"DoDO","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-11-08","2026-10-22",true,{"@type":102,"interactionType":103,"userInteractionCount":44},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What must be done before accessing terminals during service?","Question",{"text":112,"@type":113},"All supply circuit must be disconnected before accessing the terminals, and after stopping operation, turn off the power-supply breaker. Discharge the condenser before work involving electric parts.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What precautions apply when using R410A new refrigerant piping?",{"text":117,"@type":113},"Use new refrigerant pipes and ensure the inside and outside are clean with no contaminants such as sulfur, oxides, dirt, or shaving particles. Store piping indoors with both ends sealed until just before brazing.",{"name":119,"@type":110,"acceptedAnswer":120},"Why must specified tools and refrigerant be used for R410A systems?",{"text":121,"@type":113},"Only tools specifically designed for R410A should be used, and only the specified refrigerant must be used. Using other refrigerants or improper tools may cause deterioration, malfunction, or serious hazards like burst, explosion, or fire.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},640315,1792723855,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":44,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145,"preview_page_count":4},962093270745,"https://ap-avatar.wpscdn.com/davatar_9964176cb1d06d4a9deccf72a44ae3dc","SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS  \nHFC  \nutilized  \nR410A  \nSeptember 2020  \nNo. OCH730 REVISED EDITION-A  \nTECHNICAL & SERVICE MANUAL  \n[Model Name]\u003COutdoor unit> MXZ-8C48NA2  \nMXZ-8C60NA2  \nMXZ-4C36NAHZ2  \nMXZ-5C42NAHZ2  \nMXZ-8C48NAHZ2 \u003CBranch box> PAC-MKA52BC  \nPAC-MKA32BC  \n[Service Ref.] MXZ-8C48NA2-U1  \nMXZ-8C60NA2-U1 MXZ-4C36NAHZ2-U1  \nMXZ-5C42NAHZ2-U1  \nMXZ-8C48NAHZ2-U1  \nPAC-MKA52BC  \nPAC-MKA32BC  \nCONTENTS  \n1. SAFETY PRECAUTION....................................2  \n2. OVERVIEW OF UNITS......................................5  \n3. SPECIFICATIONS.............................................9  \nModel name 4. DATA................................................................13  \nindication 5. OUTLINES AND DIMENSIONS......................35  \n6. WIRING DIAGRAM......................................... 37  \n7. NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION.... 41  \n8. TROUBLESHOOTING.................................... 46  \n9. PRECAUTIONS AGAINST REFRIGERANT LEAKAGE....137  \n10. DISASSEMBLY PROCEDURE......................138  \nOUTDOOR UNIT: MXZ-4C36NAHZ2-U1 11. REMOTE CONTROLLER ............................. 159  \nPARTS CATALOG (OCB730)  \nBRANCH BOX: PAC-MKA52BC  \n1  \nSAFETY PRECAUTION  \n1-1. ALWAYS OBSERVE FOR SAFETY  \nBefore obtaining access to terminal, all supply circuit must be disconnected.  \n\n| Preparation before the repair service |\n| --- |\n| • Prepare the proper tools.\u003Cbr>• Prepare the proper protectors.\u003Cbr>• Provide adequate ventilation.\u003Cbr>• After stopping the operation of the air conditioner, turnoff the power-supply breaker.\u003Cbr>• Discharge the condenser before the work involving the electric parts. |\n\n\n| Precautions during the repair service |\n| --- |\n| • Do not perform the work involving the electric parts with wet hands.\u003Cbr>• Do not pour water into the electric parts.\u003Cbr>• Do not touch the refrigerant.\u003Cbr>• Do not touch the hot or cold areas in the refrigerating cycle.\u003Cbr>• When the repair or the inspection of the circuit needs to be done without turning off the power, exercise great caution not to touch the live parts.\u003Cbr>• When opening or closing the valve below freezing temperatures, refrigerant may spurt out from the gap between the valve stem and the valve body, resulting in injuries. |\n\n1-2. CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilizing refrigerant R410A  \nUse new refrigerant pipes.  \n\n| Make sure that the inside and outside of refrigerant piping is clean and it has no contaminants such as sulfur, oxides, dirt, shaving particles, etc.,\u003Cbr>which are hazard to refrigerant cycle. In addition, use pipes with specified thickness. |\n| --- |\n| Contamination inside refrigerant piping can cause deterioration of refrigerant oil, etc. |\n\n\n| Store the piping indoors, and keep both ends of the piping sealed until just before brazing.\u003Cbr>(Leave elbow joints, etc. in their packaging.) |\n| --- |\n| If dirt, dust or moisture enters into refrigerant cycle, that can cause deterioration of refrigerant oil or malfunction of compressor. |\n\n\n| The refrigerant oil applied to flare and flange connections must be ester oil, ether oil or alkylbenzene oil in a small amount. |\n| --- |\n| If large amount of mineral oil enters, that can cause deterioration of refrigerant oil, etc. |\n\n\n| Use a vacuum pump with a reverse flow check valve. |\n| --- |\n| Vacuum pump oil may flow back into refrigerant cycle and that can cause deterioration of refrigerant oil, etc. |\n\n\n| Use the following tools specifically designed for use with R410A refrigerant. |\n| --- |\n| The following tools are necessary to use R410A refrigerant.\u003Cbr>Tools for R410A Gauge manifold Flare tool Charge hose Size adjustment gauge Gas leak detector Vacuum pump adaptor Torque wrench Electronic refrigerant charging scale |\n\n\n| Handle tools with care. |\n| --- |\n| If dirt, dust or moisture enters into refrigerant cycle, that can cause deterioration of refrigerant oil or malfunction of compressor. |\n\n\n| Use the specified refrigerant only. |\n| --- |\n| Never u","cbCaicqmf2neR5Rh","https://ap.wps.com/l/cbCaicqmf2neR5Rh","pdf",28653333,182,"English","# SAFETY PRECAUTION\n## ALWAYS OBSERVE FOR SAFETY\n## CAUTIONS RELATED TO NEW REFRIGERANT\n## Cautions for service\n## Additional refrigerant charge","[{\"question\":\"What must be done before accessing terminals during service?\",\"answer\":\"All supply circuit must be disconnected before accessing the terminals, and after stopping operation, turn off the power-supply breaker. Discharge the condenser before work involving electric parts.\"},{\"question\":\"What precautions apply when using R410A new refrigerant piping?\",\"answer\":\"Use new refrigerant pipes and ensure the inside and outside are clean with no contaminants such as sulfur, oxides, dirt, or shaving particles. Store piping indoors with both ends sealed until just before brazing.\"},{\"question\":\"Why must specified tools and refrigerant be used for R410A systems?\",\"answer\":\"Only tools specifically designed for R410A should be used, and only the specified refrigerant must be used. Using other refrigerants or improper tools may cause deterioration, malfunction, or serious hazards like burst, explosion, or fire.\"}]","SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS - HFC R410A - No. OCH730 REVISED EDITION-A TECHNICAL & SERVICE MANUAL | PDF",1792708512,459]