• PRINTED IN JAPAN, Apr., 2006 ToMo MMU-AP0071MH MMU-AP0091MH MMU-AP0121MH MMU-AP0151MH MMU-AP0181MH This Service Manual describes contents of the Compact 4-Way Air Discharge Cassette indoor unit. For the outdoor unit, refer to the Manual with FILE No. A03-009, A05-004, A05-015 . CONTENTS SAFETY CAUTION ............................................................................................ 3 1. CONSTRUCTION VIEWS (EXTERNAL VIEWS) ........................................ 8 2. WIRING DIAGRAM ..................................................................................... 9 3. PARTS RATING........................................................................................ 10 4. REFRIGERATING CYCLE DIAGRAM ...................................................... 34 5. CONTROL OUTLINE ................................................................................ 35 6. APPLIED CONTROL ................................................................................ 39 7. TROUBLESHOOTING .............................................................................. 44 8. CONFIGURATION OF CONTROL CIRCUIT ............................................ 94 9. DETACHMENTS ....................................................................................... 99 10. P.C. BOARD EXCHANGE PROCEDURES ............................................ 108 11. EXPLODED VIEWS AND PARTS LIST .................................................. 113 2 SAFETY CAUTION The important contents concerned to the safety are described on the product itself and on this Service Manual. Please read this Service Manual after understanding the described items thoroughly in the following contents, and keep them. WARNING Check earth wires. Before troubleshooting or repair work, check the earth wire is connected to the earth terminals of the main unit, otherwise an electric shock is caused when a leak occurs. If the earth wire is not correctly connected, contact an electric engineer for rework. Prohibition of modification. Do not modify the products. Do not also disassemble or modify the parts. It may cause a fire, electric shock or injury. Use specified parts. For spare parts, use those specified (. ..... ). If unspecified parts are used, a fire or electric shock may be caused. .: For details, refer to the parts list. Do not bring a child close to the equipment. Before troubleshooting or repair work, do not bring a third party (a child, etc.) except the repair engineers close to the equipment. It causes an injury with tools or disassembled parts. Please inform the users so that the third party (a child, etc.) does not approach the equipment. Insulating measures Connect the cut-off lead cables with crimp contact, etc, put the closed end side upward and then apply a water-cut method, otherwise a leak or production of fire is caused at the users’ side. No fire When repairing the refrigerating cycle, take the following measures. 1) Be attentive to fire around the cycle. When using a gas stove, etc, be sure to put out fire before work; otherwise the oil mixed with refrigerant gas may catch fire. 2) Do not use a welder in the closed room. When using it without ventilation, carbon monoxide poisoning may be caused. 3) Do not bring inflammables close to the refrigerant cycle, otherwise fire of the welder may catch the inflammables. Refrigerant Check the used refrigerant name and use tools and materials of the parts which match with it. For the products which use R410A refrigerant, the refrigerant name is indicated at a position on the outdoor unit where is easy to see. To prevent miss-charging, the route of the service port is changed from one of the former R22. For an air conditioner which uses R410A, never use other refrigerant than R410A. For an air conditioner which uses other refrigerant (R22, etc.), never use R410A. If different types of refrigerant are mixed, abnormal high pressure generates in the refrigerating cycle and an injury due to breakage may be caused. Do not charge refrigerant additionally. If charging refrigerant additionally when refrigerant gas leaks, the refrigerant composition in the refrigerating cycle changes resulted in change of air conditioner characteristics or refrigerant over the specified standard amount is charged and an abnormal high pressure is applied to the inside of the refrigerating cycle resulted in cause of breakage or injury. Therefore if the refrigerant gas leaks, recover the refrigerant in the air conditioner, execute vacuuming, and then newly recharge the specified amount of liquid refrigerant. In this time, never charge the refrigerant over the specified amount. When recharging the refrigerant in the refrigerating cycle, do not mix the refrigerant or air other than R410A into the specified refrigerant. If air or others is mixed with the refrigerant, abnormal high pressure generates in the refrigerating cycle resulted in cause of injury due to breakage. After inst...
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