Table Of Contents; Read Before Servicing; Iii Outdoor Unit Components; Iv Remote Controller - Mitsubishi Electric PURY-P72 Service Handbook

CONTENTS
I Read Before Servicing

[1] Read Before Servicing.............................................................................................................. 3

[2] Necessary Tools and Materials ................................................................................................ 4
[3] Piping Materials ........................................................................................................................ 5
[4] Storage of Piping ...................................................................................................................... 7
[5] Pipe Processing........................................................................................................................ 7
[6] Brazing...................................................................................................................................... 8
[7] Air Tightness Test..................................................................................................................... 9
[8] Vacuum Drying (Evacuation) .................................................................................................. 10
[9] Refrigerant Charging .............................................................................................................. 12
[10] Remedies to be taken in case of a Refrigerant Leak............................................................ 12
[11] Characteristics of the Conventional and the New Refrigerants ............................................ 13
[12] Notes on Refrigerating Machine Oil...................................................................................... 14
II Restrictions
[1] System configuration .............................................................................................................. 17
[2] Types and Maximum allowable Length of Cables .................................................................. 18
[3] Switch Settings and Address Settings .................................................................................... 19
[4] Sample System Connection ................................................................................................... 26
[5] An Example of a System to which an MA Remote Controller is connected ........................... 28
[6] An Example of a System to which an ME Remote Controller is connected ........................... 42
[7] An Example of a System to which both MA Remote Controller and
ME Remote Controller are connected .................................................................................... 44
[8] Restrictions on Pipe Length.................................................................................................... 47

III Outdoor Unit Components

[1] Outdoor Unit Components and Refrigerant Circuit ................................................................. 61
[2] Control Box of the Outdoor Unit.............................................................................................. 66
[3] Outdoor Unit Circuit Board...................................................................................................... 70
[4] BC Controller Components..................................................................................................... 80
[5] Control Box of the BC Controller ............................................................................................ 83
[6] BC Controller Circuit Board .................................................................................................... 84

IV Remote Controller

[1] Functions and Specifications of MA and ME Remote Controllers .......................................... 89
[2] Group Settings and Interlock Settings via the ME Remote Controller .................................... 90
[3] Interlock Settings via the MA Remote Controller .................................................................... 94
[4] Using the built-in Temperature Sensor on the Remote Controller.......................................... 95

V Electrical Wiring Diagram

[1] Electrical Wiring Diagram of the Outdoor Unit ........................................................................ 99
[2] Electrical Wiring Diagram of the BC Controller..................................................................... 104
[3] Electrical Wiring Diagram of Transmission Booster.............................................................. 114

VI Refrigerant Circuit

[1] Refrigerant Circuit Diagram .................................................................................................. 117
[2] Principal Parts and Functions ............................................................................................... 126

VII Control

[1] Functions and Factory Settings of the Dipswitches .............................................................. 137
[2] Controlling the Outdoor Unit ................................................................................................. 144
[3] Controlling BC Controller ...................................................................................................... 159
[4] Operation Flow Chart............................................................................................................ 160

VIII Test Run Mode

[1] Items to be checked before a Test Run................................................................................ 169
[2] Test Run Method .................................................................................................................. 170
[3] Operating Characteristic and Refrigerant Amount................................................................ 171
[4] Adjusting the Refrigerant Amount......................................................................................... 171
[5] Refrigerant Amount Adjust Mode.......................................................................................... 174
[6] The following symptoms are normal. .................................................................................... 176
[7] Standard Operation Data (Reference Data) ......................................................................... 177
HWE09130 GB