Mitsubishi FDUA125VNPWVH - Operation Control Overview

'22 • PAC-SM-412
-
1
-
TABLE OF CONTENTS
1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER ......................2
1.1 Remote control (Option parts) .....................................................................2
1.2 Operation control function by the wired remote control ...........................5
1.3 Operation control function by the indoor control ......................................8
1.4 Operation control function by the outdoor control .................................. 27
(1) Compressor speed .....................................................................................27
(2) Compressor protection start .......................................................................27
(3) Outdoor fan control .....................................................................................27
(4) Defrost operation ........................................................................................29
(5) Cooling overload protective control ............................................................30
(6) Cooling high pressure control .....................................................................30
(7) Cooling low outdoor temperature protective control ...................................31
(8) Heating high pressure control .....................................................................31
(9) Heating overload protective control ............................................................32
(10) Heating low outdoor air temperature protective control ..............................32
(11) Compressor overheat protection ................................................................32
(12) Current safe ................................................................................................33
(13) Current cut ..................................................................................................33
(14) Outdoor unit failure .....................................................................................33
(15) Serial signal transmission error protection ..................................................33
(16) Rotor lock ....................................................................................................33
(17) Refrigeration cycle system protection .........................................................33
(18) Silent mode ................................................................................................. 34
(19) Broken wire detection on temperature sensor ............................................34
(20) Refrigerant ejection control .........................................................................34
2. MAINTENANCE DATA ......................................................................................36
2.1 Diagnosing of microcomputer circuit ........................................................36
(1) Selfdiagnosis function ................................................................................. 36
(2) Troubleshooting procedure .........................................................................39
(3) Troubleshooting at the indoor unit ..............................................................39
(4) Troubleshooting at the outdoor unit ............................................................44
(5) Outdoor unit control failure diagnosis circuit diagram .................................47
(6) Check of anomalous operation data with the remote control .....................50
(7)
Power transistor module (Including the driver PCB) inspection procedure ...52
(8) Inverter checker for diagnosis of inverter output .........................................53
2.2 Troubleshooting ow ..................................................................................54
(1) List of troubles ............................................................................................54
(2) Troubleshooting ..........................................................................................55
2.3 Zone control installation manual (FDU, FDUA series only) .....................96
3. ELECTRICAL WIRING ....................................................................................110
(1) Indoor units ................................................................................................110
(2) Outdoor unit ...............................................................................................114
4. PIPING SYSTEM ..............................................................................................115