Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual page 5

(14) Outdoor fan motor protection ..................................................................121
(15) Outdoor fan control at low outdoor temperature .....................................121
(16) Refrigeration cycle system protection .....................................................122
(Ⅱ) Models FDC71-140 .................................................................................123
(1) Determination of comressor speed (Frequency) .....................................123
(2) Compressor start control .........................................................................123
(3) Compressor soft start control ..................................................................124
(4) Outdoor fan control ..................................................................................125
(5) Defrost operation .....................................................................................127
(6)
Protective control/anomalous stop control by compressor's number of revolutions
(7) Silent mode ..............................................................................................132
(8) Test run ....................................................................................................132
(9) Pump-down control ..................................................................................132
(10) Base heater ON/OFF output control (Option) ..........................................133
1.11 MAINTENANCE DATA ....................................................................................134
1.11.1 Diagnosing of microcomputer circuit ....................................................134
(1) Selfdiagnosis function ..............................................................................134
(2) Troubleshooting procedure ......................................................................139
(3) Troubleshooting at the indoor unit ...........................................................139
(4) Troubleshooting at the outdoor unit .........................................................142
(5) Check of anomalous operation data with the remote control ...................164
(6) Power transistor module (including the driver PCB) inspection procedure .........167
(7) Inverter checker for diagnosis of inverter output .....................................169
(8) Outdoor unit control failure diagnosis circuit diagram ..............................170
1.11.2 Troubleshooting flow .............................................................................178
(1) List of troubles .........................................................................................178
(2) Troubleshooting .......................................................................................180
1.12 TECHNICAL INFORMATION ..........................................................................253
■ How to read the model name
Example: FDT 40 Z SXVH
Example: FDT 100 VNX P VH
Series code
Inverter type
Product capacity
Model name
FDT : Ceiling cassette-4 way type
SRC : Outdoor unit
Series code
: Single type
(blank)
P : Twin type
T : Triple type
D : Double twin type
Applicable power source...See the specification
Product capacity
Model name
FDT : Ceiling cassette-4 way type
FDC : Outdoor unit
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'19 • PAC-T-327
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