– 2 –
ADOPTION OF NEW REFRIGERANT
This Air Conditioner is a new type which adopts a new refrigerant HFC (R410A) instead of the conventional
refrigerant R22 in order to prevent destruction of the ozone layer.
WARNING
Cleaning of the air filter and other parts of the air filter involves dangerous work in high places, so be sure to
have a service person do it. Do not attempt it yourself.The cleaning diagram for the air filter is there for the
service person, and not for the customer.
CONTENTS
1. SPECIFICATIONS .......................................................................................................... 3
1-1. Indoor Unit.............................................................................................................................................. 3
1-2. Combination Specifications of Indoor Units with Outdoor Units ...................................................... 4
1-3. Operation Characteristic Curve............................................................................................................ 5
2. CONSTRUCTIONVIEWS (EXTERNALVIEWS)............................................................ 6
2-1. Indoor Unit.............................................................................................................................................. 6
3. SYSTEMATIC REFRIGERATING CYCLE DIAGRAM.................................................... 7
3-1. Indoor Unit/Outdoor Unit....................................................................................................................... 7
4. WIRING DIAGRAM....................................................................................................... 10
4-1. Indoor Unit............................................................................................................................................ 10
5. SPECIFICATIONS OF ELECTRICAL PARTS.............................................................. 12
5-1. Indoor Unit............................................................................................................................................ 12
6. REFRIGERANT R410A................................................................................................ 13
6-1. Safety During Installation/Servicing .................................................................................................. 13
6-2. Refrigerant Piping Installation.......................................................................................................... 13
6-3. Tools ..................................................................................................................................................... 17
6-4. Recharging of Refrigerant................................................................................................................... 18
6-5. Brazing of Pipes................................................................................................................................... 19
6-6. Tolerance of Pipe Length and Pipe Head...........................................................................................21
6-7. Additional Refrigerant Amount........................................................................................................... 22
6-8. Piping Materials and Sizes.................................................................................................................. 23
6-9. Branch Pipe.......................................................................................................................................... 23
7. CONTROL BLOCK DIAGRAM..................................................................................... 24
7-1. Indoor Control Circuit.......................................................................................................................... 24
7-2. Control Specifications ......................................................................................................................... 25
7-3. Indoor Print Circuit Board ................................................................................................................... 32
8. CIRCUIT CONFIGURATION AND CONTROL SPECIFICATIONS .............................. 33
8-1. Indoor Control Circuit.......................................................................................................................... 33
9. TROUBLESHOOTING.................................................................................................. 35
9-1. Summary ofTroubleshooting.............................................................................................................. 35
9-2. Check Code List................................................................................................................................... 37
9-3. Error Mode Detected by LED on Outdoor P.C. Board ....................................................................... 40
9-4. Troubleshooting Procedure for Each Check Code............................................................................ 41
10. REPLACEMENT OF SERVICE INDOOR P.C. BOARD................................................ 57
11. SETUP AT LOCAL SITE AND OTHERS...................................................................... 61
11-1. Indoor Unit............................................................................................................................................ 61
11-2. Setup at Local Site / Others ................................................................................................................ 67
11-3. How to Set up Central Control Address Number .............................................................................. 71
12. ADDRESS SETUP ....................................................................................................... 72
12-1. Address Setup ..................................................................................................................................... 72
12-2. Address Setup & Group Control......................................................................................................... 73
12-3. Address Setup ..................................................................................................................................... 74
13. DETACHMENTS........................................................................................................... 76
13-1. Indoor Unit............................................................................................................................................ 76
14. EXPLODEDVIEWS AND PARTS LIST........................................................................ 84
14-1. Ceiling Panel ........................................................................................................................................ 84
14-2. Compact 4-way Air Discharge CassetteType .................................................................................... 85
