Mitsubishi Electric CITY MULTI CMB-P1010V-E, Service Handbook

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Contents
1 PRECAUTIONS FOR DEVICES THAT USE R407C REFRIGERANT ..... 1
[1] Storage of Piping Material ................................................................. 2
[2] Piping Machining ............................................................................... 3
[3] Necessary Apparatus and Materials and Notes on Their Handling .. 4
[4] Brazing .............................................................................................. 5
[5] Airtightness Test ................................................................................ 6
[6] Vacuuming ........................................................................................ 6
[7] Charging of Refrigerant ..................................................................... 7
[8] Dryer ................................................................................................. 7
2
COMPONENT OF EQUIPMENT ............................................................. 8
[1] Appearance of Components ............................................................. 8
[2] Refrigerant Circuit Diagram and Thermal Sensor ........................... 15
[3] Equipment Composition .................................................................. 17
[4] Electrical Wiring Diagram ................................................................ 18
[5] Standard Operation Data ................................................................ 27
[6] Function of Dip SW and Rotary SW ................................................ 29
[7] External Input/Output Specifications ............................................... 32
3 TEST RUN ............................................................................................. 33
[1] Before Test Run ............................................................................... 33
[2] Address setting ............................................................................... 38
[3] Test Run Method ............................................................................. 43
4 GROUPING REGISTRATION OF INDOOR UNITS WITH REMOTE
CONTROLLER ....................................................................................... 44
5 CONTROL .............................................................................................. 50
[1] Control of Heat Source Unit ............................................................ 50
[2] Control box cooling system ............................................................. 54
[3] Control of BC Controller .................................................................. 55
[4] Operation Flow Chart ...................................................................... 56
[5] List of Major Component Functions ................................................ 62
[6] Resistance of Temperature Sensor ................................................. 65
6 REFRIGERANT AMOUNT ADJUSTMENT ............................................ 66
[1] Refrigerant Amount and Operating Characteristics ........................ 66
[2] Adjustment and Judgement of Refrigerant Amount ........................ 66
7 TROUBLESHOOTING ........................................................................... 75
[1] Principal Parts ................................................................................. 75
[2] BC Controller Disassembly Procedure .......................................... 103
[3] Self-diagnosis and Countermeasures Depending on the
Check Code Displayed .................................................................. 109
[4] LED Monitor Display ..................................................................... 131
8 PREPARATION, REPAIRS AND REFRIGERANT REFILLING
WHEN REPAIRING LEAKS ................................................................. 141
[1] Location of leaks: Extension piping or indoor units (when cooling) ... 141
[2] Location of leaks: Heat Source Unit (Cooling mode) .................... 141
[3] Location of Leaks: Extension Piping or Indoor Units
(Heating mode) ............................................................................. 142
[4] Location of Leaks: Heat Source Unit (when Heating) ................... 142
9 CHECK THE COMPOSITION OF THE REFRIGERANT ..................... 143
0
DIFFERENCES BETWEEN THE PREVIOUS REFRIGERANT
AND THE NEW REFRIGERANT ......................................................... 145
[1] Chemical Characteristics .............................................................. 145
[2] Chances in Composition ............................................................... 145
[3] Pressure Characteristics ............................................................... 146
A REFRIGERATOR OIL .......................................................................... 147
[1] Refrigerator Oil with HFC Based Refrigerants .............................. 147
[2] Influence of Contaminants ............................................................ 147