Gree DC Inverter Multi VRF Service Manual page 3

4.6 cassette type indoor unit........................................................................................................ 127
5 INSTALLATION REQUIREMENTS OF REFRIGERANT PIPING ...................................... 138
5.1 Specification of refrigerant pipe............................................................................................ 138
5.2 Allowable Length and Height Differences of the Refrigerant Piping between the Indoor and
Outdoor Units.............................................................................................................................. 138
5.3 Size of Connection Pipe ........................................................................................................ 138
6 INSTALLATION OF REFRIGERANT PIPING ........................................................................ 140
6.1 Flow Chart of Installation ..................................................................................................... 140
6.2 Three Principles of Refrigerant Piping Installation............................................................... 140
6.3 Installation of Metal Embedded Pipe .................................................................................... 141
6.4 Installation of Carriage of Refrigerant pipin ......................................................................... 141
6.5 Management and Machining of Refrigerant Piping .............................................................. 142
6.6 Installation of Refrigerant Piping.......................................................................................... 146
6.7 Welding of Copper Pipe ........................................................................................................ 148
6.8 Cleaning of Refrigerant Piping ............................................................................................. 153
6.9 Pressure Maintaining and Leak Hunting ............................................................................... 155
6.10 Heat Preservation of Refrigerant Piping ............................................................................. 156
6.11 Vacuum Pumping ................................................................................................................ 157
6.12 Refrigerant Charge .............................................................................................................. 158
7 INSTALLATION OF ELECTRONIC EXPANSION VALVE ASSY ........................................ 160
7.1 Direction Requirements ........................................................................................................ 160
8 INSTALLATION OF CONDENSATE PIPE............................................................................... 162
8.1 Material quality requirements ............................................................................................... 162
8.2 Key points for installation ..................................................................................................... 162
8.3 Installation of drainage hose for different types of indoor unit............................................. 166
8.4 Test for Condensate Pipe....................................................................................................... 170
8.5 Requirements of Heat Insulation........................................................................................... 171
9 ELECTRICAL INSTALLATION................................................................................................. 172
9.1 Precautions for Electrical Installation ................................................................................... 172
9.2 Specifications of power cord & circuit breaker..................................................................... 172
9.3 Wiring Sketch Map ............................................................................................................... 172
9.4 Dial-up .................................................................................................................................. 173
MAINTENANCE ...................................................................................................................................... 179
1 List of Unit Errors.......................................................................................................................... 179
1.1 List of Error Display on Wired Controller ............................................................................ 179
1.2 Display Code on Digital Tube of Outdoor Mainboard.......................................................... 182
1.3 Display of the number of indoor units .................................................................................. 182
2 Flow chart of troubleshooting ....................................................................................................... 183
3 WIRING DIADRAM ..................................................................................................................... 192
3.1 Outdoor unit .......................................................................................................................... 192
3.2 Indoor unit............................................................................................................................. 193
4 DISASSEMBLY AND ASSEMBLY PROCEDURE OF MAIN PARTS.................................... 202
4.1 Removal and Assembly of Outdoor Unit .............................................................................. 202
4.2 Removal and Assembly of Indoor Unit................................................................................. 209
5 EXPLODED VIEWS AND PART LIST ...................................................................................... 232
5.1 Exploded Views and Parts List of Outdoor Unit ................................................................... 232
5.2 Exploded Views and Parts List of Indoor Unit...................................................................... 235
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