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- Page 1 Midea LC3 Series DC Inverter Air Conditioner Technical Service Manual Applicable Model: Indoor unit Outdoor unit IDR3-X 26M MCR3-X 26M IDR3-X 35M MCR3-X 35M IDR3-X 53M MCR3-X 53M IDR3-X 71M MCR3-X 71M IDR3-X 90M MCR3-X 90M IDR3-X 105M MCR3-X 105M...
- Page 2 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 Content Part. 1 General information..........2 Part. 2 Outdoor Unit............6 Part. 3 Indoor Unit............22 Part. 4 Installation & Troubleshooting ......77...
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Page 3: Part. 1 General Information
MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual Part. 1 General information 1. Model Names of Indoor/Outdoor Units ......3 2. External Appearance ............3 3. Nomenclature ..............5... - Page 4 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 1. Model Names of Indoor/Outdoor Units Indoor unit Outdoor unit Model Power supply Model Power supply IDR3-X 26M 220-240V~, 1Ph, 50/60Hz MCR3-X 26M 220-240V~, 1Ph, 50/60Hz IDR3-X 35M 220-240V~, 1Ph, 50/60Hz...
- Page 5 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual 2.2 Outdoor unit MCR3-X 26M/ MCR3-X 35M/ MCR3-X 53M MCR3-X 71M/ MCR3-X 90M MCR3-X 105M/ MCR3-X 140M MCR3-X 160M...
- Page 6 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 3. Nomenclature 3.1 Indoor unit I D R3– X Phase type - M: Single phase Capacity type - 26: 2600W Refrigerant type - X: R410A Series number：R3 Medium static pressure Indoor unit 3.2 Outdoor unit...
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Page 7: Table Of Contents
MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual Part. 2 Outdoor Unit 1. Specifications ..............7 2. Dimension (Unit:mm) ............9 3. Refrigerant circuit ............11 4. Wiring Diagrams .............. 16 5. Electric Characteristics ........... 20 6. Sound Levels ..............21... - Page 8 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 1. Specifications Table 1.1: MCR3-X 26(35,53,71)M specifications Model name MCR3-X 26M MCR3-X 35M MCR3-X 53M MCR3-X 71M Power supply 1-phase, 220-240V, 50/60Hz Capacity 2600(700~3500) 3500(700~4000) 5300(1000~6000) 7200(2400~8200) Cooling Power input...
- Page 9 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual Table 1.2: MCR3-X (90,105,140,160)M specifications 10.5 14.0 16.0 Model name MCR3-X 90M MCR3-X 105M MCR3-X 140M MCR3-X 160M Power supply 1-phase, 220-240V, 50/60Hz Capacity 9000 10500 14000 16000 Cooling...
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Page 10: Dimension (Unit:mm)
Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 2. Dimension (Unit: mm) MCR3-X 26M/ MCR3-X 35M/ MCR3-X 53M Model 35/53 MCR3-X 71M/ MCR3-X 90M Model 71/90... - Page 11 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCR3-X 105M/ MCR3-X 140M Model 105/140 MCR3-X 160M Model 1040 1053...
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Page 12: Refrigerant Circuit
Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 3. Refrigerant circuit MCR3-X 26M / MCR3-X 35M E S C Compressor Silencer Four-way reversing valve Silencer Condenser Fan blade Motor Heating spool Refrigerant cooling module Throttling capillary Stop valve (liquid side) - Page 13 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCR3-X 53M E S C Compressor Silencer Four-way reversing valve Silencer Condenser Fan blade Motor Heating spool Refrigerant cooling module Refrigeration spool Stop valve (liquid side) Evaporator Indoor unit wind wheel...
- Page 14 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 MCR3-X 71M E S C Compressor Silencer Four-way reversing valve Silencer Condenser Fan blade Motor Heating spool Refrigerant cooling module Refrigeration spool Stop valve (liquid side) Evaporator Indoor unit wind wheel...
- Page 15 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCR3-X 90M E S C Compressor Silencer Four-way reversing valve Silencer Condenser Fan blade Motor Heating spool Refrigerant cooling module Refrigeration spool Stop valve (liquid side) Evaporator Indoor unit wind wheel...
- Page 16 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 IDR3-X 105M、IDR3-X 140M、IDR3-X 160M E S C Compressor Silencer High pressure switch Four-way reversing valve Condenser Fan blade Motor Heating spool Refrigerant cooling module Refrigeration spool Filter Stop valve (liquid side)
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Page 17: Wiring Diagrams
MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual 4. Wiring Diagrams MCR3-X 26M / MCR3-X 35M MCR3-X 53M / MCR3-X 71M Outdoor wire diagram DC Fan CN414 Four Way Valve CN60 CN23 Debug Board Brown L-IN Outdoor main Controller... - Page 18 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202002 MCR3-X 90M...
- Page 19 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCR3-X 105M / MCR3-X 140M...
- Page 20 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202002 MCR3-X 160M...
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Page 21: Electric Characteristics
MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual 5. Electric Characteristics Model Power Supply Compressor Capacity Volts Min.volts Max.volts TOCA 50/60 220-240 11.5 0.02 0.44 50/60 220-240 12.5 0.034 0.44 50/60 220-240 13.4 15.8 11.9 0.056 0.71... -
Page 22: Sound Levels
Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202002 6. Sound Levels Front (H+1)/2 m Notes: H is the height of ODU Model Noise level under three speeds of fan (dB(A)) MCR3-X 26M MCR3-X 35M MCR3-X 53M MCR3-X 71M... -
Page 23: Part. 3 Indoor Unit
MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual Part. 3 Indoor Unit 1.Specifications ..............23 2.Dimensions (Unit: mm) ............26 3.Wiring Diagrams ..............30 4.Capacity Table ..............34 5.Static Pressure Curve ............70 6.Electric Characteristics ............. 74 7.Sound Levels .............. - Page 24 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 1. Specifications Table 1.1: IDR3-X 26(35,53)M specifications Model name IDR3-X 26M IDR3-X 35M IDR3-X 53M Power supply 1-phase, 220-240V, 50/60Hz Capacity 2600(700~3500) 3500 (700~4000) 5300(1000~6000) Input(IDU+ODU) 715(170~1420) 1020(190~1460) 1500(250~2370)
- Page 25 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual Table 1.2: IDR3-X 71(90)M specifications Model name IDR3-X 71M IDR3-X 90M Power supply 1-phase, 220-240V, 50/60Hz Capacity 7200(2400~8200) 9000 Input(IDU+ODU) 2180(450~3280) 2750 Cooling Input(IDU) 3.30 3.27 Capacity 8600(2100~9600) 10000...
- Page 26 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 Table 1.3: IDR3-X 105(140,160)M specifications Model name IDR3-X 105M IDR3-X 140M IDR3-X 160M Power supply 1-phase, 220-240V, 50/60Hz Capacity 10500 14000 16000 Input(IDU+ODU) 3000 4650 5500 Cooling Input(IDU) 3.50 3.01...
- Page 27 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual 2. Dimensions (Unit: mm) IDR3-X 26M/ IDR3-X 35M/ IDR3-X 53M/ IDR3-X 71M External dimensions and size of air outlet duct Size of return air inlet (back return air mode)
- Page 28 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 IDR3-X 90M External dimensions and size of air outlet duct Size of return air inlet (back return air mode) Size of return air inlet (bottom return air mode), and the distance between the lugs...
- Page 29 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual IDR3-X 105M External dimensions and size of air outlet opening Distance between the lugs Size of air inlet opening (air intake from rear) Air filter Size of air inlet opening (air intake from below)
- Page 30 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 IDR3-X 140M/ IDR3-X 160M Return Air Inlet Air Outlet Size of Air Outlet Size of Return Air Inlet External dimension Size of Air Outlet Size of Return Air Inlet...
- Page 31 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual 3. Wiring Diagrams IDR3-X 26M/ IDR3-X 35M/ IDR3-X 53M/ IDR3-X 71M...
- Page 32 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 IDR3-X 90M...
- Page 33 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual IDR3-X 105M...
- Page 34 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 IDR3-X 140M / IDR3-X 160M...
- Page 35 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual 4. Capacity Table Model 26 Cooling mode: Indoor air temperature (° C WB/DB) Indoor Outdoor air airflow rate temperature 14/20 16/23 18/26 19/27 20/28 22/30 24/32 (° C DB) 10.00...
- Page 36 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 46.00 1.63 1.33 1.81 1.44 1.99 1.55 2.05 1.55 2.11 1.64 2.23 1.78 2.35 1.92 48.00 1.53 1.27 1.71 1.38 1.89 1.48 1.95 1.49 2.01 1.58 2.13 1.72 2.10 1.74...
- Page 37 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual Heating mode: Indoor air temperature (° C DB) Outdoor air temperature Indoor airflow (° C) rate (m -15.30 -15.00 2.53 2.36 2.19 2.11 2.02 1.85 -13.00 2.71 2.54 2.37 2.28...
- Page 38 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 -7.60 -7.00 2.11 2.00 1.88 1.83 1.77 1.65 -5.60 -5.00 2.22 2.10 1.99 1.93 1.87 1.76 -3.70 -3.00 2.39 2.27 2.16 2.10 2.04 1.93 -0.70 0.00 2.52 2.40 2.29 2.23...
- Page 39 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual Model 35 Cooling mode: Indoor air temperature (° C WB/DB) Indoor Outdoor air 14/20 16/23 18/26 19/27 20/28 22/30 24/32 airflow rate temperature (° C DB) 10.00 4.13 2.80 4.39...
- Page 40 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 42.00 2.52 2.02 2.76 2.16 3.00 2.29 3.08 2.28 3.16 2.41 3.32 2.60 3.48 2.80 44.00 2.40 1.95 2.64 2.09 2.88 2.22 2.96 2.22 3.04 2.34 3.20 2.53 3.36 2.73...
- Page 41 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual Heating mode: Indoor air temperature (° C DB) Outdoor air temperature Indoor (° C) airflow rate -15.30 -15.00 2.64 2.45 2.26 2.17 2.08 1.89 -13.00 2.86 2.68 2.49 2.39 2.30...
- Page 42 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 21.41 23.00 5.31 5.13 4.95 4.86 4.77 4.59 22.37 24.00 5.36 5.18 5.00 4.91 4.82 4.64 -15.30 1.76 1.63 1.51 1.45 1.38 1.26 -15.00 -13.00 -12.60 1.91 1.78 1.66 1.60...
- Page 43 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual Model 53 Cooling mode: Indoor air temperature (° C WB/DB) Outdoor air Indoor airflow 14/20 16/23 18/26 19/27 20/28 22/30 24/32 temperature rate (m (° C DB) 10.00 7.21 4.58...
- Page 44 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 42.00 4.40 3.31 4.64 3.44 4.80 3.51 4.96 3.56 5.15 3.74 5.34 3.92 5.44 4.03 44.00 4.01 3.04 4.25 3.18 4.41 3.25 4.57 3.30 4.76 3.48 4.95 3.66 5.04 3.77...
- Page 45 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual Heating mode: Indoor air temperature (° C DB) Indoor airflow Outdoor air temperature (° C) rate (m -15.30 -15.00 3.48 3.26 3.04 2.95 2.87 2.69 -13.00 -12.60 3.88 3.66 3.45...
- Page 46 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 21.41 23.00 7.56 7.36 7.16 7.08 7.00 6.84 22.37 24.00 7.62 7.42 7.22 7.14 7.06 6.90 -15.30 -15.00 2.45 2.29 2.14 2.08 2.02 1.89 -13.00 -12.60 2.73 2.58 2.42 2.36...
- Page 47 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual Model 71 Cooling mode: Indoor air temperature (° C WB/DB) Indoor Outdoor air 14/20 16/23 18/26 19/27 20/28 22/30 24/32 airflow rate temperature (° C DB) 10.00 10.28 6.35 10.55...
- Page 48 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 42.00 6.22 4.55 6.46 4.66 6.62 4.70 6.78 4.72 7.02 4.95 7.26 5.17 7.38 5.32 44.00 5.80 4.28 6.04 4.40 6.20 4.45 6.36 4.46 6.60 4.69 6.84 4.91 6.96 5.06...
- Page 49 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual Heating mode: Indoor air temperature (° C DB) Indoor airflow rate Outdoor air temperature (° C) -15.30 6.34 6.12 5.89 5.81 5.72 5.54 -15.00 -13.00 6.74 6.52 6.29 6.21 6.12...
- Page 50 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 22.37 24.00 9.85 9.65 9.45 9.37 9.29 9.13 -15.30 -15.00 4.37 4.22 4.07 4.01 3.94 3.82 -13.00 -12.60 4.65 4.50 4.34 4.28 4.22 4.10 -11.00 -10.50 4.89 4.74 4.58 4.52...
- Page 51 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual Model 90 Cooling mode: Indoor air temperature (°C WB/DB) Indoor Outdoor air airflow 14/20 16/23 18/26 19/27 20/28 22/30 24/32 temperature rate (°C DB) 10.00 10.38 7.13 10.86 7.28 11.34...
- Page 52 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 42.00 5.34 4.46 5.76 4.69 6.18 4.90 6.32 4.88 6.46 4.86 6.74 4.93 7.02 4.99 44.00 4.91 4.13 5.32 4.37 5.74 4.60 5.88 4.59 6.02 4.57 6.30 4.65 6.58 4.72...
- Page 53 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual Heating mode: Indoor air temperature (° C DB) Outdoor air Indoor airflow rate (m temperature (° C) -15.30 -15.00 5.46 5.20 4.94 4.81 4.68 4.42 -13.00 6.01 5.75 5.49 5.36...
- Page 54 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 22.37 24.00 10.50 10.27 10.04 9.93 9.81 9.58 -15.30 -15.00 4.33 4.13 3.92 3.82 3.71 3.51 -13.00 -12.60 4.77 4.56 4.36 4.26 4.15 3.95 -11.00 -10.50 5.15 4.95 4.74 4.64...
- Page 55 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual Model 105 Cooling mode: Indoor air temperature (° C WB/DB) Indoor Outdoor air 14/20 16/23 18/26 19/27 20/28 22/30 24/32 Airflow temperature m3/h (° C DB) 10.00 12.80 8.28 13.10...
- Page 56 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 42.00 6.35 5.04 6.65 5.20 6.85 5.27 7.05 5.30 7.45 5.68 7.85 6.06 8.05 6.30 44.00 5.81 4.66 6.11 4.83 6.31 4.91 6.51 4.94 6.91 5.32 7.31 5.70 7.51 5.94...
- Page 57 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual Heating mode: Indoor air temperature (° C DB) Outdoor air Indoor Airflow temperature (° C) m3/h -15.30 -15.00 6.74 6.42 6.10 5.95 5.80 5.50 -13.00 -12.60 7.34 7.02 6.70 6.55...
- Page 58 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 21.41 23.00 11.73 11.41 11.09 10.94 10.79 10.49 22.37 24.00 11.83 11.51 11.19 11.04 10.89 10.59 -15.30 -15.00 3.62 3.30 2.98 2.83 2.68 2.38 -13.00 -12.60 4.10 3.78 3.46 3.31...
- Page 59 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual Model 140 Cooling mode: Indoor air temperature (° C WB/DB) Indoor Outdoor air airflow 14/20 16/23 18/26 19/27 20/28 22/30 24/32 temperature rate (° C DB) 10.00 16.80 10.86 17.10...
- Page 60 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 42.00 7.69 6.10 7.99 6.24 8.19 6.29 8.39 6.31 8.79 6.70 9.19 7.10 9.39 7.35 44.00 7.09 5.69 7.39 5.84 7.59 5.90 7.79 5.91 8.19 6.30 8.59 6.70 8.79 6.95...
- Page 61 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual Heating mode: Indoor air temperature (° C DB) Outdoor air temperature Indoor airflow (° C) rate (m -15.30 -15.00 10.92 10.60 10.28 10.13 9.98 9.68 -13.00 -12.60 11.54 11.22 10.90...
- Page 62 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 22.37 24.00 14.10 13.78 13.46 13.31 13.16 12.86 -15.30 -15.00 4.41 4.09 3.77 3.62 3.47 3.17 -13.00 -12.60 4.96 4.64 4.32 4.17 4.02 3.72 -11.00 -10.50 5.44 5.12 4.80 4.65...
- Page 63 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual Model 160 Cooling mode: Indoor air temperature (° C WB/DB) Indoor Outdoor air airflow 14/20 16/23 18/26 19/27 20/28 22/30 24/32 temperature rate (° C DB) 10.00 19.55 12.64 19.85...
- Page 64 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 42.00 9.49 7.53 9.79 7.65 9.99 7.68 10.19 7.66 10.59 8.07 10.99 8.49 11.19 8.76 44.00 8.77 7.04 9.07 7.17 9.27 7.21 9.47 7.19 9.87 7.60 10.27 8.01 10.47 8.28...
- Page 65 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual Heating mode: Indoor air temperature (° C DB) Outdoor air temperature Indoor airflow rate (° C) -15.30 -15.00 12.74 12.40 12.06 11.90 11.74 11.42 -13.00 -12.60 13.39 13.05 12.71 12.55...
- Page 66 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 22.37 24.00 16.46 16.12 15.78 15.62 15.46 15.14 -15.30 -15.00 4.99 4.65 4.31 4.15 3.99 3.67 -13.00 -12.60 5.64 5.30 4.96 4.80 4.64 4.32 -11.00 -10.50 6.21 5.87 5.53 5.37...
- Page 67 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual 5. Static Pressure Curve Model 26 Airflow(m3/h) Model 35 Airflow(m3/h)
- Page 68 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 Model 53 1000 Airflow(m3/h) Model 71 1000 1100 1200 1300 1400 Airflow(m3/h)
- Page 69 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual Model 90 1000 1100 1200 1300 1400 1500 1600 Airflow(m3/h) Model 105 1200 1400 1600 1800 2000 2200 2400 Airflow(m3/h)
- Page 70 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 Model 140 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 Airflow(m3/h) Model 160 1500 1700 1900 2100 2300 2500 2700 2900 3100 3300 Airflow(m3/h)
- Page 71 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual 6. Electric Characteristics Power supply Indoor fan motors Rated Model name Min. Max. Volts motor volts volts output (kW) IDR3-X 26M 0.425 0.03 0.34 50/60 220-240 IDR3-X 35M 0.45 0.03...
- Page 72 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 7. Sound Levels Model Noise level under three speeds of fan (dB(A)) MCR3-X 26M 34/33/19 MCR3-X 35M 35/34/21 MCR3-X 53M 36/35/24 MCR3-X 71M 38/32/29 MCR3-X 90M 43/39/36 MCR3-X 105M...
- Page 73 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual 8. Accessories Accessory name of indoor unit Qty. Purpose Installation Manual Installation instructions User Manual Operating Instructions of air conditioner For use in the installation of connecting pipe (the quantity is one...
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Page 74: Part. 4 Installation & Troubleshooting
Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 Part. 4 Installation & Troubleshooting 1. Notes ................78 2. Installation of Duct Type Indoor Units ......75 3. Installation of Outdoor Units .......... 78 4. Water discharge piping layout ........83 5. -
Page 75: Notes
MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual 1. Notes 1.1 Selecting an installation site for IDU • Enough space for installation and maintenance. • The ceiling is level, and the structure is strong enough to support the weight of IDU; take reinforcement measures when necessary. -
Page 76: Installation Of Duct Type Indoor Units
Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 2. Installation of Duct Type Indoor Units 2.1 Installating space Ensure enough space required for installation and maintenance. (Unit: mm) 2.2 Mount the unit • Use the Φ10 lifting bolts (four). - Page 77 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual 2.3 Lifting the IDU • Mount the lifting bolt in the U-shaped groove to install the lifting lugs, lift the machine, and use the gradienter to determine how level the device is.
- Page 78 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 Air inlet grille Air inlet direction Air inlet grille Air inlet direction Figure 2 Figure 1 You need to add sponges to the air outlet flange for insulation. Metallic air diffuser Figure 3 2.5 Steps to dismantle the drain pan...
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Page 79: Installation Of Outdoor Units
MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual 3. Installation of Outdoor Units 3.1 Installating space Ensure enough space required for installation and maintenance. (Unit: mm) (Wall or obstacle) Maintenance cable and Air inlet surface >300 pipeline surface >300... -
Page 80: Water Discharge Piping Layout
Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 4. Water discharge piping layout Note: Do not exert too much force when installing the suction piping in order not to break the pipes. Wrap both the suction piping and water discharge piping evenly with heat insulation protective casing to prevent water condensation. - Page 81 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual 4.2 Water discharge test 1.Before the test, make sure that the water discharge pipeline is smooth, and check that each connection is sealed properly. 2.Conduct the water discharge test in the new room before the ceiling is paved.
- Page 82 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 5. Connection of Connecting Pipe 5.1 Length and level difference requirements for the pipe connections of IDU and Product Model Maximum length(m) Maximum level difference(m) Maximum number of bends(m)
- Page 83 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual than 3.5D (pipe diameter). • Do not bend the flexible tube back and forth more than 3 times. Bend a thin-walled connecting pipe (see the figure below): • When bending a pipe, cut off the required recess in the insulation pipe at the bend and expose the pipe (wrap the bend with a binding tie after bending).
- Page 84 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 5.4 Pipe connection Flaring Use a pipe cutter to cut off the pipe, and rotate the pipe cutter repeatedly to cut off the pipe. Insert the pipe into the connection nut flare.
- Page 85 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual Manifold valve Multimeter Pressure gauge -755mmHg Hi handle Lo handle Charging hose Charging hose Vacuum pump Low pressure valve Adding Refrigerant • If the one-way pipe length is less than 5m (including 5m), the refrigerant charging amount is determined according to the nameplate.
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Page 86: Electric Connection
Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 6. Electric Connection 6.1 Caution Before the installation, check whether the power supply of the user meets the electrical installation requirements of the product (including reliable grounding, power leakage, and wire-diameter electrical load). - Page 87 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual 6.3 Schematic diagram 26/35/53/71 Power supply Main switch/fuse (can be purchased locally) Power cable of indoor unit Grounding Grounding Indoor and outdoor power cable 90/105/140/160 Single-phase ODU electrical control system connection diagram (IDU and ODU use separate power...
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Page 88: Duct Design Scheme
Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 7. Duct Design Scheme Examples of construction and ventilation pipeline design scheme (Flowering hidden series.) Construction and ventilation pipeline design scheme... -
Page 89: Trial Run
MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual 8. Trial Run 1. Conduct the test run only after all installation tasks have been completed. 2. Check the following items during the test run. Indoor and outdoor units are properly installed. -
Page 90: Trouble Shooting
Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 9. Trouble shooting 9.1 Fault information and codes 1. Error code table(Indoor unit display) 26/35/53/71 Error code Error definition Error display IDU EPROM fault Immediate display, spot check available... - Page 91 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual protection Outdoor electric control current protection Immediate display, spot check available IDU current protection Immediate display, spot check available ODU current protection Immediate display, spot check available Input AC current sampling circuit fault...
- Page 92 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 Error code Error definition Error display IDU mismatching error Immediate display, spot check available L (L0/L1) error occurs three times in one hour, reporting H4,and this error is not recoverable.
- Page 93 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual Protection for a difference of > 15Hz between Display after 10 minutes, spot check available the set speed and operating speed Detected DC bus voltage (PN voltage) < Display after 10 minutes, spot check available...
- Page 94 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 105/140/160 Error code Error definition Error display IDU mismatching error Immediate display, spot check available L (L0/L1) error occurs three times in one hour, reporting H4,and this error is not recoverable.
- Page 95 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual Protection for a difference of > 15Hz between Display after 10 minutes, spot check available the set speed and operating speed Detected DC bus voltage (PN voltage) < Display after 10 minutes, spot check available...
- Page 96 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 2. Spot check query function (Press the button on the display board to spot check the system parameters) 26/35/53/71 Sequence number Spot check parameter contents Remarks Actual value, temperature accurate to 0.5 ℃...
- Page 97 MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual 90/105/140/160 Sequence Spot check parameter contents Remarks number 0:Standby;1:Fan only;2:Cooling;3:Heating;4:Forced Operating mode Cooling;6:dehumidification Operating wind speed and level 0:OFF;1:Low speed;2:Middle speed;3:High speed The capacity of Indoor unit(HP) The total capacity demand of...
- Page 98 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006 9.2 Fault and troubleshooting Fault Cause Solution Starting Power failure Wait for the power supply to be failure restored. Power switch is off Turn on the power The fuse of the power switch is blown.
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