Carrier 38MHRC Service Manual

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Carrier 38MHRC Service Manual Manual pdf 1 page image

Specifications subject to change without notice.TABLE OF CONTENTSPAGESAFETY CONSIDERATIONS ....................................................... 1INTRODUCTION............................................................................ 1MODEL / SERIAL NUMBER NOMENCLATURES .................... 2SPECIFICATIONS (HEAT PUMP)................................................ 3PERFORMANCE ............................................................................ 4DIMENSIONS AND WEIGHTS .................................................... 5CLEARANCES................................................................................ 9ELECTRICAL DATA ..................................................................... 10WIRING ........................................................................................... 10CONNECTION DIAGRAMS ......................................................... 11WIRING DIAGRAMS (HEAT PUMP) .......................................... 12REFRIGERATION CYCLE DIAGRAMS...................................... 15SYSTEM EVACUATION AND CHARGING ............................... 20TROUBLESHOOTING................................................................... 27DIAGNOSIS AND SOLUTION...................................................... 31DISASSEMBLY INSTRUCTIONS SIZES 9K (115V) - 18K (208/230V)................................................................................................ 51DISASSEMBLY INSTRUCTIONS SIZE 24K............................... 54APPENDIX ...................................................................................... 57SAFETY CONSIDERATIONSInstalling, starting up, and servicing air-conditioning equipment canbe hazardous due to system pressures, electrical components, andequipment location (roofs, elevated structures, etc.).Only trained, qualified installers and service mechanics should install,start-up, and service this equipment.Untrained personnel can perform basic maintenance functions such ascoil cleaning. All other operations should be performed by trainedservice personnel.When working on the equipment, observe precautions in the literatureand on tags, stickers, and labels attached to the equipment.Follow all safety codes. Wear safety glasses and work gloves. Keep aquenching cloth and fire extinguisher nearby when brazing. Use carein handling, rigging, and setting bulky equipment.Read this manual thoroughly and follow all warnings or cautionsincluded in the literature and attached to the unit. Consult localbuilding codes and National Electrical Code (NEC) for specialrequirements. Recognize safety information. This is the safety-alertsymbol . When you see this symbol on the unit and in instructionsor manuals, be alert to the potential for personal injury.Understand these signal words: DANGER, WARNING, andCAUTION. These words are used with the safety-alert symbol.DANGER identifies the most serious hazards which will result insevere personal injury or death. WARNING signifies hazards whichcould result in personal injury or death.CAUTION is used to identify unsafe practices which may result inminor personal injury or product and property damage.NOTE is used to highlight suggestions which will result in enhancedinstallation, reliability, or operation.INTRODUCTIONThis service manual provides the necessary information to service,repair, and maintain the outdoor units. This manual has an appendixwith data required to perform troubleshooting. Use the “Table ofContents” to locate a desired topic.ELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personal injuryor death.Before installing, modifying, or servicing system, mainelectrical disconnect switch must be in the OFF position.There may be more than 1 disconnect switch. Lock out andtag switch with a suitable warning label.WARNINGEXPLOSION HAZARDFailure to follow this warning could resultin death, serious personal injury, and/orproperty damage. Never use air or gasescontaining oxygen for leak testing oroperating refrigerant compressors.Pressurized mixtures of air or gasescontaining oxygen can lead to an explosion.WARNINGEQUIPMENT DAMAGE HAZARDFailure to follow this caution may result in equipment damageor improper operation.Do not bury more than 36 in. (914 mm)of refrigerant pipe in the ground. If any section of pipe isburied, there must be a 6 in. (152 mm) vertical rise to the valveconnections on the outdoor units.If more than the recommended length is buried, refrigerantmay migrate to the cooler buried section during extendedperiods of system shutdown. This causes refrigerant sluggingand could possibly damage the compressor at start-up.CAUTIONService Manual38MHRCOutdoor Unit Single Zone Ductless SystemSizes 09 to 24