2017
Trouble Shooting
Guide Book
Contents
Ⅰ. Basic Part
1 . U n i t C o n v e r s i o n 0 0 8
2. Temperature Vs. Pressure of Ref. 009
3. P-H Diagram_R410A 012
4. P-H Diagram_R134a 014
Ⅱ. Multi V 5 Introduction
1. Nomenclature 018
2. Line Up / Capacity 021
3. Piping Diagrams 025
4. Wiring Diagrams 054
Ⅲ. Trouble Shooting Guide
1. Checking Point
1. LGMV 064
2. Lack of Cooling 065
3. Lack of Heating 067
4. Check The Amount of Refrigerant 069
5.
Cycle Changes by Amount of Refrigerant
073
2. Self-Diagnosis Function
1. Error Code Display 076
2. Error Code Check 080
3. Checking Method for Key Components
1. The Phenomena from Main
Component Failure 150
2. Compressor 151
3. EEV 156
4. Solenoid Valve 163
5. 4Way Valve 168
6. Check Valve (Outdoor EEV Check Valve) 169
7. Check Valve (Oil Separator) 169
8. Outdoor Fan & Fan Motor 170
9. Temperature Sensor 172
10. Pressure(High/Low) Sensor 173
11. Humidity Sensor 175
12. Pressure Switch 176
13. Main PCB 177
14. External PCB 179
15. Inverter PCB 181
16. Fan PCB 183
17. Communication PCB 185
18. Phase Bridge Diode 186
19. Inverter IGBT 187
20. Fan IPM 188
21. Central Controller PC Status 190
App. Service & Replace Method
of Control Box, Inverter PCB 194
Ⅳ. Function Control
1. Generation 4 Features 196
2. Function Control Setting 197
3. FDD Mode 200
4. Function Mode 210
5. SVC Mode 237
6. IDU Mode 253
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