Midea LC3 Series Operating manual

Midea LC3 Series
DC Inverter Air Conditioner
Technical Service Manual
Applicable Model:
Indoor unit Outdoor unit
IDR3-X 26M
IDR3-X 35M
IDR3-X 53M
IDR3-X 71M
IDR3-X 90M
IDR3-X 105M
IDR3-X 140M
IDR3-X 160M
MCR3-X 26M
MCR3-X 35M
MCR3-X 53M
MCR3-X 71M
MCR3-X 90M
MCR3-X 105M
MCR3-X 140M
MCR3-X 160M

Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006
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Content
Part. 1 General information...............................................2
Part. 2 Outdoor Unit...........................................................6
Part. 3 Indoor Unit............................................................22
Part. 4 Installation & Troubleshooting...........................77

MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual
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Part. 1 General information
1. Model Names of Indoor/Outdoor Units .............................3
2. External Appearance ..........................................................3
3. Nomenclature......................................................................5

Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006
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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
MCR3-X 35M
220-240V~, 1Ph, 50/60Hz
IDR3-X 53M
220-240V~, 1Ph, 50/60Hz
MCR3-X 53M
220-240V~, 1Ph, 50/60Hz
IDR3-X 71M
220-240V~, 1Ph, 50/60Hz
MCR3-X 71M
220-240V~, 1Ph, 50/60Hz
IDR3-X 90M
220-240V~, 1Ph, 50/60Hz
MCR3-X 90M
220-240V~, 1Ph, 50/60Hz
IDR3-X 105M
220-240V~, 1Ph, 50/60Hz
MCR3-X 105M
220-240V~, 1Ph, 50/60Hz
IDR3-X 140M
220-240V~, 1Ph, 50/60Hz
MCR3-X 140M
220-240V~, 1Ph, 50/60Hz
IDR3-X 160M
220-240V~, 1Ph, 50/60Hz
MCR3-X 160M
220-240V~, 1Ph, 50/60Hz
2. External Appearance
2.1 Indoor units
IDR3-X 26M / IDR3-X 35M/ IDR3-X 53M/ IDR3-X 71M/ IDR3-X 90M/ IDR3-X 105M
IDR3-X 140M/ IDR3-X 160M

MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual
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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

Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006
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3. Nomenclature
3.1 Indoor unit
I D R3– X 26 M
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
M C R3 - X 26 M
Phase type - M: Single phase
Capacity type - 26: 2600W
Refrigerant type - X: R410A
Series number：R3
Commercial
Outdoor unit

MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual
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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
7. Accessories .....................................................................21

Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006
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1. Specifications
Table 1.1: MCR3-X 26(35,53,71)M specifications
kW
2.6
3.5
5.3
7.1
Model name
MCR3-X 26M
MCR3-X 35M
MCR3-X 53M
MCR3-X 71M
Power supply
1-phase, 220-240V, 50/60Hz
Cooling
Capacity
W
2600(700~3500)
3500(700~4000)
5300(1000~6000)
7200(2400~8200)
Power input
W
715(170~1420)
1020(190~1460)
1500(250~2370)
2180(450~3280)
Heating
Capacity
W
3600(700~3800)
4150 (800~4600)
6200(1200~6800)
8600W(2100~9600)
Power input
W
920(170~1360)
1200(190~1570)
1650(300~2460)
2400(400~3650)
Compressor
Type
ASN98D22UFZ
ASM135D23UFZ
ATF235D22UMT
Quantity
1
1
1
1
Oil type
ESTER OIL VG74
ESTER OIL VG74
450ML
POE(VG74) 670ML
Start-up method
soft start
Fan
Type
ZKFN-20-8-1
ZKFN-34-8-1
WZDK56-38G-W
WZDK80-38G-W(A)
Motor type
DC motor
Quantity
1
Motor output
kW
0.02
0.034
0.056
0.08
Static pressure
Pa
/
Airflow rate
m3/h
1718
1718
2283
3715
Drive type
External Drive
Refrigerant
Type
R410A
Factory charge
g
850
1050
1600
1800
Throttle
type
\
Throttle valve throttling
Pipe
connections
Liquid pipe
mm
Φ6.4
Gas pipe
mm
Φ9.5
Φ12.7
Φ15.9
Sound pressure level
dB(A)
50
54
55
Net dimensions (W×H×D)
mm
722×555×260
795×555×287
795×555×287
910×712×345
Packed dimensions (W×H×D)
mm
845×610×390
915×610×420
915×610×420
1045×800×485
Net weight
kg
27
29.5
35
53
Gross weight
kg
30
32.5
38
58
Ambient
temp.
operation
range
Cooling
oC
10~55
Heating
oC
-15~24
Controller
WDC-86E/KD
Note:
1. The design implementation standard of this unit is GB/T 18836-2017.
2. The parameters in the table are the nominal values tested under the rated working conditions specified in GB/T 18836-2017, and actual
operating parameters will vary with the working conditions.
3. The above parameters may change due to product improvement. Please refer to the nameplate parameters of the product.

MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual
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Table 1.2: MCR3-X (90,105,140,160)M specifications
kW
9.0
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
Cooling
Capacity
W
9000
10500
14000
16000
Power input
W
2750
3000
4650
5500
Heating
Capacity
W
10000
11600
16000
18000
Power input
W
2900
3000
4500
5350
Compressor
Type
KTM240D57UMT
KTM240D57UMT
ATF400D64UMTC
ATF400D64UMV
Quantity
1
1
1
1
Oil type
ESTER OIL VG74 670ml
ESTER OIL VG74 670ml
POE(VG74) 800ML
POE(VG74) 1000ML
Start-up method
soft start
Fan
Type
ZKFN-80-8-3
WZDK170-38G-1
WZDK170-38G-1
ZKSP-170-8-9
Motor type
DC motor
Quantity
1
Motor output
kW
0.08
0.17
0.17
0.17
Static pressure
Pa
/
Airflow rate
m3/h
3715
5086
5086
5395
Drive type
External Drive
Built-in Drive
Built-in Drive
Built-in Drive
Refrigerant
Type
R410A
Factory charge
g
1900
3000
3200
3800
Throttle
type
\
Throttle valve throttling
Pipe
connections
Liquid pipe
mm
Φ9.5
Φ9.5
Φ9.5
Φ9.5
Gas pipe
mm
Φ15.9
Φ15.9
Φ15.9
Φ15.9
Sound pressure level
dB(A)
55
59
59
59
Net dimensions (W×H×D)
mm
910x712x345
950x840x360
950x840x360
1040x865x410
Packed dimensions (W×H×D)
mm
1045×810×485
1025×950×510
1025×950×510
1120×980×560
Net weight
kg
48
68
78.5
91
Gross weight
kg
53
76.5
87
101
Ambient
temp.
operation
range
Cooling
oC
10~55
Heating
oC
-15~24
Controller
WDC-86E/KD
Note:
1. The design implementation standard of this unit is GB/T 18836-2017.
2. The parameters in the table are the nominal values tested under the rated working conditions specified in GB/T 18836-2017, and actual
operating parameters will vary with the working conditions.
3. The above parameters may change due to product improvement. Please refer to the nameplate parameters of the product.

Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006
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2. Dimension (Unit: mm)
MCR3-X 26M/ MCR3-X 35M/ MCR3-X 53M
Model
A
B
C
D
E
F
G
H
I
26
722
453
302
327
260
50
135
555
300
35/53
795
514
340
365
287
50
125
555
330
MCR3-X 71M/ MCR3-X 90M
Model
A
B
C
D
E
F
G
H
I
71/90
910
982
390
345
120
663
712
375
426
G
B
A
F
E
I
H
D
C

MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual
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MCR3-X 105M/ MCR3-X 140M
Model
A
B
C
D
E
F
G
H
I
105/140
900
/
406
360
175
590
840
390
440
MCR3-X 160M
Model
A
B
C
D
E
F
G
H
I
160
1040
1053
452
410
191
656
865
563
523
A
G
D
C
I
H
F
E
B
A
G
D
C
I
H
F
E

Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006
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3. Refrigerant circuit
MCR3-X 26M / MCR3-X 35M
M
1
T5
2
T4
T3
7
5
6
3
8
9
10
11
12
13 14
15
E S C
D
T1
T2
16
4
1
Compressor
2
Silencer
3
Four-way reversing valve
4
Silencer
5
Condenser
6
Fan blade
7
Motor
8
Heating spool
9
Refrigerant cooling module
10
Throttling capillary
11
Stop valve (liquid side)
12
Evaporator
13
Indoor unit wind wheel
14
Indoor unit motor
15
Stop valve (gas side)
16
Temperature control switch
T1
Indoor temperature sensor
T2
Temperature sensor in the middle of evaporator
T3
Condenser outlet temperature sensor
T4
Outdoor temperature sensor
T5
Exhaust temperature sensor

MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual
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MCR3-X 53M
M
1
T5
2
T4
T3
7
5
6
3
8
9
10
11
12
13 14
15
E S C
D
T1
T2
16
4
1
Compressor
2
Silencer
3
Four-way reversing valve
4
Silencer
5
Condenser
6
Fan blade
7
Motor
8
Heating spool
9
Refrigerant cooling module
10
Refrigeration spool
11
Stop valve (liquid side)
12
Evaporator
13
Indoor unit wind wheel
14
Indoor unit motor
15
Stop valve (gas side)
16
Temperature control switch
T1
Indoor temperature sensor
T2
Temperature sensor in the middle of evaporator
T3
Condenser outlet temperature sensor
T4
Outdoor temperature sensor
T5
Exhaust temperature sensor

Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006
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MCR3-X 71M
M
1
T5
2
T4
T3
7
5
6
3
8
9
10
11
12
13 14
15
E S C
D
T1
T2
16
4
1
Compressor
2
Silencer
3
Four-way reversing valve
4
Silencer
5
Condenser
6
Fan blade
7
Motor
8
Heating spool
9
Refrigerant cooling module
10
Refrigeration spool
11
Stop valve (liquid side)
12
Evaporator
13
Indoor unit wind wheel
14
Indoor unit motor
15
Stop valve (gas side)
16
Temperature control switch
T1
Indoor temperature sensor
T2
Temperature sensor in the middle of evaporator
T3
Condenser outlet temperature sensor
T4
Outdoor temperature sensor
T5
Exhaust temperature sensor

MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service Manual
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MCR3-X 90M
M
1
T5
2
T4
T3
7
5
6
3
8
9
10
11
12
13 14
15
E S C
D
T1
T2
16
4
T2B
1
Compressor
2
Silencer
3
Four-way reversing valve
4
Silencer
5
Condenser
6
Fan blade
7
Motor
8
Heating spool
9
Refrigerant cooling module
10
Refrigeration spool
11
Stop valve (liquid side)
12
Evaporator
13
Indoor unit wind wheel
14
Indoor unit motor
15
Stop valve (gas side)
16
Temperature control switch
T1
Indoor temperature sensor
T2
Temperature sensor in the middle of evaporator
T2B
Temperature sensor in the Evaporator outlet
T3
Condenser outlet temperature sensor
T4
Outdoor temperature sensor
T5
Exhaust temperature sensor

Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202006
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IDR3-X 105M、IDR3-X 140M、IDR3-X 160M
M
1
T5
2
3
T4
T3
7
5
6
4
8
9
10
11
12
13
14 15
16
17
18
E S C
D
T1
T2
T2B
1
Compressor
2
Silencer
3
High pressure switch
4
Four-way reversing valve
5
Condenser
6
Fan blade
7
Motor
8
Heating spool
9
Refrigerant cooling module
10
Refrigeration spool
11
Filter
12
Stop valve (liquid side)
13
Evaporator
14
Indoor unit wind wheel
15
Indoor unit motor
16
Stop valve (gas side)
17
Gas-liquid separator
18
Low pressure switch
T1
Indoor temperature sensor
T2
Indoor temperature sensor
T2B
Temperature sensor in the Evaporator outlet
T3
Condenser outlet temperature sensor
T4
Outdoor temperature sensor
T5
Exhaust temperature sensor

MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service
Manual
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4. Wiring Diagrams
MCR3-X 26M / MCR3-X 35M
MCR3-X 53M / MCR3-X 71M
1
2
3
CN6
CN7
CN2
CN8
5/6
CN18 U
VW
CN6-1
CN60
Electronic
Expansive Valve
3
Terminal
Separatingboard
Blue
Red
Black Black
Red
Blue
Comp
INDOORUNIT
CN414
CN27
CN29
CN28
2
L N S
CN23 4
Earth
N-IN
S
L-IN
Earth
W
U
V
DC Fan
M
EEV.
T3
Cond.Temp.
Sensor Outdoor Temp.
Sensor T4
CN17
CompressorTop
Temp.Switch DischargeTemp. Sensor TP
U
V
W
FourWayValve
Debug Board
Blue
Black
Black White Red Red
Brown
Y/G
Y/G
Y/G
Outdoor main Controller
Outdoor wire diagram

Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202002
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MCR3-X 90M

MCAC-UTSM-202006 Midea LC3 Series DC Inverter Air conditioner Technical Service
Manual
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MCR3-X 105M / MCR3-X 140M

Midea LC3 Series DC Inverter Air conditioner Technical Service Manual MCAC-UTSM-202002
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MCR3-X 160M