Name: Midea V6-i Series
Brand: Midea
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V6-i VRF 50/60Hz

104

Midea V6-i Series Service Manual

Figure 6-2.11: Effects of spoiled compressor oil

Worn scroll plate

Normal compressor

bearings

Seriously worn and

damaged bearings

Filter blocked by impurities,

which leads to abnormal

compressor suction

Worn crankshaft

Contents2
General Information2
General Information4
Fresh Air Processing Unit5
Indoor and Outdoor Unit Capacities5
Standard Indoor Unit Capacity Range5
Standard Indoor Units5
Outdoor Unit Capacity Range6
External Appearance7
Heat Recovery Ventilator7
Standard Indoor Unit Appearance7
Combination Ratio9
Combinations of Indoor and Outdoor Units9
Indoor and Outdoor Unit Combination Ratio Limitations9
Component Layout and Refrigerant Circuits10
8/10/12 Layout of Functional Components11
Layout of Functional Components11
14/16/18 Layout of Functional Components12
20/22 Layout of Functional Components13
26/28 Layout of Functional Components15
30/32 Layout of Functional Components16
8/10/12HP Piping Diagram17
14/16/18HP Piping Diagram18
20/22/24HP Piping Diagram19
26/28HP Piping Diagram20
30/32HP Piping Diagram21
Key Components22
Part 3 Control22
8/10/12HP Refrigerant Flow During Cooling Operation23
Cooling Operation23
Oil Return Operation in Cooling Mode23
Refrigerant Flow Diagrams23
Heating Operation24
Oil Return Operation in Heating Mode and Defrosting Operation24
Table of Contents34
Control34
General Control Scheme Flowchart35
- Crankcase Heater Control36
- Crankcase Heater Controlled According to Outdoor Ambient Temperature36
- Startup Control37
Standby Control36
Stop Operation36
- Compressor Startup Delay Control37
- Startup Control for Cooling Operation37
- Component Control During Startup in Heating Mode38
- Startup Control for Heating Operation38
- Component Control During Normal Cooling Operation39
- Component Control During Normal Operation39
- Normal Operation Control39
  - Component Control During Heating Operation40
  - Compressor Output Control41
  - Compressor Step Control41
  - Operating Priority and Rotation of Compressors41
  - Electronic Expansion Valve Control42
  - Outdoor Fan Control42
  - Outdoor Fan Speed Steps42
  - Discharge Temperature Protection Control44
  - High Pressure Protection Control44
  - Low Pressure Protection Control44
- Protection Control44
  - Compressor and Inverter Module Protection Control45
  - Disable Heating Control45
  - Oil Return Operation46
- Special Control46
  - Timing of Oil Return Operation46
  - Defrosting Operation48
  - Indoor Unit Component Control During Defrosting Operation48
  - Outdoor Unit Component Control During Defrosting Operation48
  - Field Settings50
  - Outdoor Unit Field Settings51
  - PCB Switches and Switch Settings51
  - Heating Priority Mode53
  - Modes Set on Main PCB53
  - Priority Mode Setting53
  - Night Silent Time Setting54
  - Silent Time Setting54
  - Maximum Fan Speed and Capacity Output Control in Different Silent Mode55
  - Silent Mode Setting55
  - Electrical Components and Wiring Diagrams56
  - 8-18HP Bottom Layer of Electric Control Box57
  - 8-18HP Top Layer of Electric Control Box57
- Outdoor Unit Electric Control Box Layout57
  - 20-32HP Bottom Layer of Electric Control Box58
  - 20-32HP Top Layer of Electric Control Box58
- Outdoor Unit Main PCB59
  - Outdoor Unit Main PCB Ports59
  - Main PCB Ports60
  - Function of Buttons SW3 to SW661
  - Layout61
  - Outdoor Unit Main PCB Components61
  - Menu Mode62
  - Menu Mode Selection Flowchart62
  - Menu Mode Function63
  - How to Exit Specified Menu Mode64
  - UP / down System Check Button64
  - Digital Display Output65
- Compressor Inverter Module66
  - Compressor Inverter Module Components66
  - Dial Switch S7 Setting66
- Wiring Diagrams67
- LED Indicators LED1 and LED266
- Part 6 Diagnosis and Troubleshooting70
- Error Code Table71
- Troubleshooting72
- E1: Phase Sequence Error73
- Trigger / Recover Condition73
- E2: Communication Error between Indoor and Outdoor Unit75
- E4: Temperature Sensor (T3/T4) Error77
- E5: Abnormal Power Supply Voltage79
- E7: Temperature Sensor (T7C1/2) Error81
- E8: Outdoor Unit Address Error83
- Xe9: EEPROM Mismatch85
- Xf1: DC Bus Voltage Error87
- F3, F5: Temperature Sensor (T6B/T6A) Error89
- F6: Electronic Expansion Valve Connection Error91
- Xh0: Communication Error93
- Xh4: Inverter Module Protection95
- LED Indicators LED1 and LED2 on Inverter Module96
- L0: Inverter Module Protection97
- L1: DC Bus Low Voltage Protection98
- L2: DC Bus High Voltage Protection99
- L4: MCE Error100
- L7: Phase Sequence Error101
- Check Oil in Other Compressors in the System103
- Compressor Replacement Procedure103
- Inspect Oil from Faulty Compressor103
- Replace Oil Separator(S) and Accumulator(S)103
- Inspecting Compressor Oil104
- Vacuum Drying and Refrigerant Charging104
- Effects of Spoiled Compressor Oil105
- Unmatched Total Number of Indoor Units106
- H8: High Pressure Sensor Error108
- P1: Discharge Pipe High Pressure Protection110
- P2, H5: Suction Pipe Low Pressure Protection112
Combination Ratio114
- Xp3: Compressor Current Protection114
- P4, H6: Discharge Temperature Protection116
- P5: Outdoor Heat Exchanger Temperature Protection118
- P9, H9: Fan Module Protection120
- PL, C7: Inverter Module Temperature Protection122
- PP: Compressor Discharge Insufficient Superheat Protection124
- Temperature Sensor Resistance Characteristics126
- Normal Operating Parameters of Refrigerant System129
- Outdoor Unit Cooling Mode Operating Parameters129

Brand	Midea
Model	V6-i Series
Category	Air Conditioner
Language	English

Midea V6-i Series Service Manual

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