Table Of Contents - Mitsubishi Electric PQHY-P72TYHMU-A 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 ........................... 27
[6] An Example of a System to which an ME Remote Controller is connected ........................... 49
[7] An Example of a System to which both MA Remote Controller and
ME Remote Controller are connected .................................................................................... 53
[8] Restrictions on Pipe Length.................................................................................................... 58
III Heat source Unit Components
[1] Heat source Unit Components and Refrigerant Circuit........................................................... 75
[2] Control Box of the Heat source Unit ....................................................................................... 78
[3] Heat source Unit Circuit Board ............................................................................................... 81
[4] BC Controller Components..................................................................................................... 88
[5] Control Box of the BC Controller ............................................................................................ 91
[6] BC Controller Circuit Board .................................................................................................... 92
IV Remote Controller
[1] Functions and Specifications of MA and ME Remote Controllers .......................................... 97
[2] Group Settings and Interlock Settings via the ME Remote Controller .................................... 98
[3] Interlock Settings via the MA Remote Controller .................................................................. 102
[4] Using the built-in Temperature Sensor on the Remote Controller........................................ 103
V Electrical Wiring Diagram
[1] Electrical Wiring Diagram of the Heat source Unit................................................................ 107
[2] Electrical Wiring Diagram of the BC Controller..................................................................... 111
[3] Electrical Wiring Diagram of Transmission Booster.............................................................. 120
VI Refrigerant Circuit
[1] Refrigerant Circuit Diagram .................................................................................................. 123
[2] Principal Parts and Functions ............................................................................................... 126
VII Control
[1] Functions and Factory Settings of the Dipswitches .............................................................. 137
[2] Controlling the Heat source Unit........................................................................................... 143
[3] Controlling BC Controller ...................................................................................................... 160
[4] Operation Flow Chart............................................................................................................ 161
VIII Test Run Mode
[1] Items to be checked before a Test Run................................................................................ 175
[2] Test Run Method .................................................................................................................. 176
[3] Operating Characteristic and Refrigerant Amount................................................................ 177
[4] Adjusting the Refrigerant Amount......................................................................................... 177
[5] Refrigerant Amount Adjust Mode.......................................................................................... 182
[6] The following symptoms are normal. .................................................................................... 186
[7] Standard Operation Data (Reference Data) ......................................................................... 187
HWE09080 GB