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Includes safety considerations for electrical shock and explosion hazards, plus cautions such as refrigerant pipe burial limits. Provides an overview of the indoor unit service information, model number nomenclature, wiring requirements per NEC/CEC and local codes, and guidance for power/communication wiring to minimize EMI. 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Untrained personnel may perform basic maintenance such as coil cleaning, while other operations must be done by trained service personnel.","Answer",{"name":114,"@type":109,"acceptedAnswer":115},"What electrical safety steps are required before installing or servicing the unit?",{"text":116,"@type":112},"Before installing, modifying, or servicing the unit, the main electrical disconnect switch must be in the OFF position. There may be more than one disconnect switch, which must be locked out and tagged with a suitable warning label.",{"name":118,"@type":109,"acceptedAnswer":119},"What wiring requirements does the manual specify for sizing power and communication cables?",{"text":120,"@type":112},"All wires must be sized per NEC or CEC and local codes. The manual instructs using the Electrical Data table values for MCA (minimum circuit amps) and MOCP (maximum over current protection) to correctly size conductors and the disconnect fuse or breakers.","https://schema.org",{"og:url":83,"og:type":123,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":125,"canonical":83},"index,follow",{"doc_id":127,"site_id":62},641643,1792746294,{"code":4,"msg":5,"data":130},{"doc_id":127,"user_id":131,"nickname":92,"user_avatar":132,"doc_module":4,"category_id":39,"category_name":40,"doc_title":65,"doc_description":67,"doc_content":133,"file_id":134,"file_url":135,"file_type":136,"file_size":137,"view_count":8,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":138,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":143,"read_time":144},5909892330395,"https://ap-avatar.wpscdn.com/davatar_6f874abed73319feea01a86fa6f0fab8","40MHH  \nHigh Wall Ductless System Sizes 09 to 24  \nService Manual  \nTABLE OF CONTENTS  \nPAGE  \nSAFETY CONSIDERATIONS ............................. 1  \nINTRODUCTION ....................................... 1  \nMODEL NUMBER NOMENCLATURE ..................... 2  \nWIRING ............................................... 3  \nCONNECTION DIAGRAMS .............................. 4  \nWIRING DIAGRAMS.................................... 5  \nREFRIGERATION CYCLE DIAGRAM ..................... 7  \nREFRIGERANT LINES .................................. 7  \nELECTRONIC FUNCTIONS .............................. 8  \nINQUIRY MODE ...................................... 11  \nMULTI-FUNCTION BOARD INSTRUCTION ............... 12  \nTROUBLESHOOTING .................................. 13  \nINDOOR UNIT DIAGNOSTIC GUIDE ..................... 14  \nDIAGNOSIS AND SOLUTION ........................... 15  \nAPPENDICES ......................................... 35  \nDISASSEMBLY INSTRUCTIONS ........................ 38  \nSAFETY CONSIDERATIONS  \nInstalling, starting up, and servicing air-conditioning equipment can be hazardous due to unit pressures, electrical components, and equipment location (roofs, elevated structures, etc.) .  \nOnly trained, qualified installers and service mechanics should install, start-up, and service this equipment.  \nUntrained personnel can perform basic maintenance functions such as coil cleaning. All other operations should be performed by trained service personnel only.  \nWhen working on the equipment, observe the precautions in the literature and on tags, stickers, and labels attached to the equipment.  \nFollow all safety codes. Wear safety glasses and work gloves. Keep a quenching cloth and fire extinguisher nearby when brazing. Use care in handling, rigging, and setting bulky equipment.  \nRead this manual thoroughly and follow all the warnings or cautions included in the literature and attached to the unit. Consult local building codes and the National Electrical Code (NEC) for special requirements.  \nRecognize safety information. This is the safety-alert symbol  . When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury. Understand these signal words: DANGER, WARNING, and CAUTION.  \nThese words are used with the safety-alert symbol. DANGER identifies the most serious of hazards which will result in severe personal injury or death. WARNING signifies hazards which could result in personal injury or death. CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.  \nWARNING  \nELECTRICAL SHOCK HAZARD  \nFailure to follow this warning could result in personal injury or death.  \nBefore installing, modifying, or servicing the unit, the main electrical disconnect switch must be in the OFF position. There may be more than 1 disconnect switch. Lock out and tag switch with a suitable warning label.  \n\n|  WARNING |  |\n| --- | --- |\n| | EXPLOSION HAZARD\u003Cbr>Failure to follow this warning could result in death, serious personal injury, and/or property damage.\u003Cbr>Never use air or gases containing oxygen for leak testing or operating refrigerant compressors. Pressurized mixtures of air or gases containing oxygen can lead to an explosion. |\n\n\n|  CAUTION |\n| --- |\n| EQUIPMENT DAMAGE HAZARD\u003Cbr>Failure to follow this caution may result in equipment damage or improper operation.\u003Cbr>Do not bury more than 36 in. (914 mm) of refrigerant pipe in the ground. If any section of pipe is buried, there must be a 6 in. (152 mm) vertical rise to the valve connections on the outdoor units. If more than the recommended length is buried, refrigerant may migrate to the cooler buried section during the extended periods of unit shutdown. This causes refrigerant slugging and could possibly damage the compressor at start-up. |\n\nINTRODUCTION  \nThis service manua","cbCaic1MhSc5IQo4","https://ap.wps.com/l/cbCaic1MhSc5IQo4","pdf",2937713,42,"English","# TABLE OF CONTENTS\n## SAFETY CONSIDERATIONS\n## INTRODUCTION\n## MODEL NUMBER NOMENCLATURE\n## WIRING\n## CONNECTION DIAGRAMS\n## WIRING DIAGRAMS\n## REFRIGERATION CYCLE DIAGRAM\n## REFRIGERANT LINES\n## ELECTRONIC FUNCTIONS\n## INQUIRY MODE\n## MULTI-FUNCTION BOARD INSTRUCTION\n## TROUBLESHOOTING\n## INDOOR UNIT DIAGNOSTIC GUIDE\n## DIAGNOSIS AND SOLUTION\n## APPENDICES\n## DISASSEMBLY INSTRUCTIONS","[{\"question\":\"Who is allowed to install and service the equipment described in the manual?\",\"answer\":\"Only trained, qualified installers and service mechanics should install, start-up, and service the equipment. Untrained personnel may perform basic maintenance such as coil cleaning, while other operations must be done by trained service personnel.\"},{\"question\":\"What electrical safety steps are required before installing or servicing the unit?\",\"answer\":\"Before installing, modifying, or servicing the unit, the main electrical disconnect switch must be in the OFF position. There may be more than one disconnect switch, which must be locked out and tagged with a suitable warning label.\"},{\"question\":\"What wiring requirements does the manual specify for sizing power and communication cables?\",\"answer\":\"All wires must be sized per NEC or CEC and local codes. The manual instructs using the Electrical Data table values for MCA (minimum circuit amps) and MOCP (maximum over current protection) to correctly size conductors and the disconnect fuse or breakers.\"}]","40MHH - High Wall Ductless System Service Manual - Service Manual | PDF",1792715763,106]