Table Of Contents - Mitsubishi Electric CITY MULTI PUHY-P400YEM-A Service Handbook

Contents
1 PRECAUTIONS FOR DEVICES
THAT USE R407C REFRIGERANT ......................................... 1
[1] Storage of Piping Material ............................................. 2
[2] Piping Machining ........................................................... 3
[3] Brazing ........................................................................... 4
[4] Airtightness Test ............................................................. 5
[5] Vacuuming ..................................................................... 5
[6] Charging of Refrigerant ................................................. 6
[7] Dryer .............................................................................. 6
2 COMPONENT OF EQUIPMENT ............................................. 7
[1] Appearance of Components .......................................... 7
[2] Refrigerant Circuit Diagram and Thermal Sensor ........ 18
[3] Electrical Wiring Diagram ............................................. 22
[4] Standard Operation Data ............................................. 24
[5] Function of Dip SW and Rotary SW ............................ 36
3 TEST RUN ............................................................................. 42
[1] Before Test Run ........................................................... 42
[2] Test Run Method .......................................................... 48
4 GROUPING REGISTRATION OF INDOOR UNITS WITH
M-NETREMOTE CONTROLLER ........................................... 49
5 CONTROL .............................................................................. 55
[1] Control of Outdoor Unit ................................................ 55
[2] Operation Flow Chart ................................................. 106
[3] List of Major Component Functions ........................... 111
[4] Resistance of Temperature Sensor ............................ 115
6 REFRIGERANT AMOUNT ADJUSTMENT ......................... 116
[1] Operating Characteristics and Refrigerant Amount ... 116
[2] Adjustment and Judgement of Refrigerant Amount ... 116
[3] Refrigerant Volume Adjustment Mode Operation....... 119
7 TROUBLESHOOTING ......................................................... 125
[1] Principal Parts ............................................................ 125
[2] Self-diagnosis and Countermeasures Depending
on the Check Code Displayed ................................... 150
[3] LED Monitor Display ..................................................
8 PREPARATION, REPAIRS AND REFRIGERANT
REFILLING WHEN REPAIRING LEAKS
[1] Location of leaks: Extension piping or indoor units
(when cooling)
[2] Location of leaks: Outdoor unit (Cooling mode)
[3] Location of leaks: Extension piping or indoor units
(Heating mode)
[4] Location of leaks: Outdoor unit (when heating)
9 CHECK THE COMPOSITION OF THE REFRIGERANT
.............................. 199
........................................................... 199
.......................................................... 200
177
......... 200
.......... 201
...... 202