Midea MTA-48WN1, MTA-24WN1, MTA-36WN1, MTA-60WN1, MOVTB-18N1-13C Technical & Service Manual
...
Indoor unit
MTA-18WN1
MTA-24WN1
MTA-36WN1
MTA-36WN1
MTA-48WN1
MTA-60WN1
Power supply
220-240V~ 1Ph 50Hz
220-240V~ 1Ph 50Hz
220-240V~ 1Ph 50Hz
380-415V~ 3Ph 50Hz
380-415V~ 3Ph 50Hz
380-415V~ 3Ph 50Hz
Outdoor unit
MOVTB-18N1-13C
MOVTB-24N1-13C
MOVTB-36N1-13C
MOVTB-36N1-R13C
MOVTB-48N1-R13C
MOVTB-60N1-R13C
Model:
Technical Service Manual
Split AC
Content
Part. 1 General information .............. 1
Part. 2 Indoor Unit ............................. 6
Part. 3 Outdoor Unit ........................ 48
Part. 4 Installation ........................... 67
Part. 5 Wired controller ................ 104
Midea Tropical R410A High Efficient Duct Technical Manual 50Hz MCAC-UTSM-201707
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Part. 1 General information
1. Model Names of Indoor/Outdoor Units .................................. 2
2. External Appearance ............................................................. 2
3. Nomenclature ....................................................................... 3
4. Product features .................................................................... 4
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1. Model Names of Indoor/Outdoor Units
Nominal
Capacity
Indoor unit
Outdoor unit
Model
Power supply
Model
Power supply
1.5ton
MTA-18WN1
220-240V~, 50Hz, 1Ph
MOVTB-18CN1-13C
220-240V~, 50Hz, 1Ph
2ton
MTA-24WN1
220-240V~, 50Hz, 1Ph
MOVTB-24CN1-13C
220-240V~, 50Hz, 1Ph
3ton (1Ph)
MTA-36WN1
220-240V~, 50Hz, 1Ph
MOVTB-36CN1-13C
220-240V~, 50Hz, 1Ph
3ton (3Ph)
MTA-36WN1
220-240V~, 50Hz, 1Ph
MOVTB-36CN1-R13C
380-415V~, 50Hz, 3Ph
4ton (3Ph)
MTA-48WN1
220-240V~, 50Hz, 1Ph
MOVTB-48CN1-R13C
380-415V~, 50Hz, 3Ph
5ton (3Ph)
MTA-60WN1
220-240V~, 50Hz, 1Ph
MOVTB-60CN1-R13C
380-415V~, 50Hz, 3Ph
2. External Appearance
2.1 Indoor units
MTA-18WN1
MTA-24WN1, MTA-36WN1
MTA-48WN1, MTA-60WN1
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2.2 Outdoor unit
3. Nomenclature
3.1 Indoor unit:
M T A – 18 W N1
Refrigerant Type - N1: R410A
Control Type: Wired controller
Nominal Cooling Capacity (18×1,000Btu/h)
Series Number: A type
Medium Static Pressure Duct Type
Midea
3.2 Outdoor unit:
M OV T B - 36 C N1 – R 13 C
Compressor - C: Copeland
13SEER
Power Supply - R: 380-415V~, 3Ph, 50Hz
Omit: 220-240V~, 1Ph, 50Hz
Refrigerant Type - N1: R410A
Cooling only
Nominal Cooling Capacity (36×1,000Btu/h)
Series Number: B type
Tropical Appliance
Top-discharge Outdoor Unit
Midea
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4. Product features
Indoor Unit
General
These duct type indoor units which capacity range is from 1.5ton to 5ton, are suitable for
mounting above ceiling. The units are factory assembled, internally wired and tested before
leaving the manufacture. The indoor units are insulated by polyethylene foam.
Casing
The units are constructed form Heavy Gauge Zinc coated steel sheets. The sheet steel zinc
coated by hot dip process confirming to standard ASTMA 653.
Evaporator
Internally finned, copper tubes mechanically bonded to a configured hydrophilic aluminum fin
shall be standard. Coils are leak tested at the factory to ensure the pressure integrity. The
evaporator coil is already leak tested to 3,100kPa (450 psig). Anti-corrosion treatment for coils is
optional.
Drain pan
The condensate drain pan is fabricated of EPS. The inner of the drain pan adopts vacuum
forming technology.
Indoor fan
The indoor units have centrifugal fan. The fan is directly driven by indoor fan motor.
Filter
The filter is already fix in the frame of air return. It is Nylon washable type.
Outdoor unit
General
The outdoor units are top-discharge type. The units with weatherproof heavy gauge base are
factory assembled, internally wired, fully charged refrigerant and 100% run tested to check
cooling operation, fan rotation and control sequence before leaving the factory.
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Casing
Unit casing is constructed of zinc coated, heavy gauge, and galvanized steel. Exterior surfaces
shall be cleaned, G90 galvanized heavy gauge plate conforming to ASTMA 653, followed by
baked on electrostatic polyester dry powder coat paint on all external panels, completely
weatherized for outdoor installation and properly reinforced and brazed. Salt spray test for steel
sheet under 1,000 hours, specially treated can be up to 2,000 hours and even more (It should
be customized.). Cabinet construction allows for all maintenance on one side of the unit.
Service panels are removed easily and re-installed by removing screws.
Compressor
All the outdoor units have single totally enclosed hermetically scroll compressor - Copeland.
The compressors have internal overload relay. High pressure switch, low pressure switch and
discharge temperature sensor is standard.
Condenser
Internally finned, copper tubes mechanically bonded to a configured hydrophilic aluminum fin
shall be standard. Coils are leak tested at the factory to ensure the pressure integrity. The
evaporator coil is already leak tested to 3,100kPa (450 psig). Anti-corrosion treatment for coils is
optional.
Outdoor fan
The fan is direct driven by weather proof motor (IP44 and insulation class F) to ensure reliable
continuous operation. Statically and dynamically balanced drive motor design with maintenance
– free bearing for outdoor installation. The fan is multi-blade vane-axial type, made of metal
material for quiet operation and durability.
Electrical control box
In the electrical control box with the PCB board, wiring internal to the unit shall be colored and
numbered for simplified identification. The PCB parts can be coated with double-side moisture
proof paint, and the outer side of electric box metal cover is spray-painted (It should be
customized.).
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Part. 2 Indoor Unit
1. Features .............................................................................. 7
2. Specifications ...................................................................... 8
3. Dimensions ........................................................................ 19
4. Service Space ................................................................... 25
5. Refrigerant circuit .............................................................. 25
6. Wiring Diagrams ................................................................ 26
7. Capacity Table ................................................................... 35
8. Fan performance ............................................................... 41
9. Electric Characteristics ...................................................... 46
10. Sound Levels ..................................................................... 46
11. Accessories ....................................................................... 47
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1. Features
Full capacity range: 1.5ton, 2ton, 3ton, 4ton and 5ton.
Suitable for using refrigerant R410A.
Tropical design with Copeland compressor.
Blue hydrophilic fin and inner grooved copper pipe.
3-speed indoor fan for enhanced comfort.
Air intake filter as standard.
Highly efficient scroll compressor, with thermal protectors to prevent motor overheating.
Power supply of indoor and outdoor is separated, easy installation.
Long piping length. Max. equivalent piping length is 55m, and Max. vertical distance between
outdoor unit and indoor unit is 46m, when outdoor unit is up.
220V signal terminal of wired controller is reserved, and wired controller with 5V signal is
customized.
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2. Specifications
Model
MTA-18WN1
Matched outdoor unit
MOVTB-18CN1-13C
Power supply \ 220 - 240V~, 1Ph, 50Hz
Cooling (T1)
Capacity
Btu/h
18,000
W
5,274
Input
W
1,552
EER
W/W
3.40
Btu/h.W
11.6
Cooling (T3)
Capacity
Btu/h
16,000
W
4,690
Input
W
1,975
EER
W/W
2.37
Btu/h.W
8.1
Rated input
W
120
Rated current
A
0.6
Indoor
fan motor
Model (× Quantity) \ YKSS-61-4-62 (×1)
Brand
\
Matchwell/Yongan/Tongde
Input (Hi/Med/Lo) W 152/125/117
Capacitor
\
3.5μF/450V
Speed (Hi/Med/Lo)
r/min
1,322/1,191/1,144
Indoor coil
Number of rows
\
2+2
Tube pitch(a)×row pitch(b)
mm
21×13.37
Fin space
mm
1.3
Fin type
\
Hydrophilic aluminum fin
Tube size
mm
Ф7
Tube type \ Inner grooved copper pipe
Coil(W×H)
mm
(955×147) + (955×147)
Number of circuits
\
4
Indoor air flow
m3/h
1,125/901/831
CFM
662/530/489
External static pressure
Pa
25 (0 - 87)
Indoor noise level
dB(A)
42/38/37
Refrigerant
Type
\
R410A
Control
\
Throttle valve
Design pressure
MPa
4.4/2.6
Refrigerant
pipe
Liquid side/ Gas side
mm
Ф9.52/Ф19.1
Max. equivalent
refrigerant pipe length
m
55
Max. difference in level m 46
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Model
MTA-18WN1
Matched outdoor unit
MOVTB-18CN1-13C
Connecting
wire
Power wire (Indoor unit) \ 3×2.5mm2
Signal wire
\
2×0.75mm2
Drain pipe size (OD)
mm
Ф25
Controller \ Optional (220V signal reserved)
Operation temperature
°C
18 - 30
Dimension (W×H×D)
mm
1,220×210×500
Packing (W×H×D)
mm
1,360×292×560
Net/Gross weight
kg
27/32
Notes:
1. The nominal T1 cooling capacities are based on the following conditions:
Indoor temperature: 27°CDB, 19°CWB; Outdoor temperature: 35°CDB, 24°C WB;
2. The nominal T3 cooling capacities are based on the following conditions:
Indoor temperature: 29°CDB, 19°CWB; Outdoor temperature: 46°CDB, 24°C WB;
3. The noise is measured in the semi noise suppression lab. The sound level is measured 1m below the unit.
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Model
MTA-24WN1
Matched outdoor unit
MOVTB-24CN1-13C
Power supply \ 220 - 240V~, 1Ph, 50Hz
Cooling (T1)
Capacity
Btu/h
23,800
W
6,975
Input
W
2,050
EER
W/W
3.40
Btu/h.W
11.6
Cooling (T3)
Capacity
Btu/h
20,600
W
6,038
Input
W
2,512
EER
W/W
2.40
Btu/h.W
8.2
Rated input
W
332
Rated current
A
1.53
Indoor
fan motor
Model (× quantity) \ YSK200-4P (×1)
Brand
\
Welling
Input (Hi/Med/Lo) W (393/)332/278/234
Capacitor
\
10μF/450V
Speed (Hi/Med/Lo)
r/min
(1,230/)1,120/990/880
Indoor coil
Number of rows
\
4
Tube pitch(a)×row pitch(b)
mm
21×13.37
Fin space
mm
1.5
Fin type \ Hydrophilic aluminum fin
Tube size
mm
Ф7
Tube type \ Inner grooved copper pipe
Coil(W×H)
mm
955×336
Number of circuits
\
8
Indoor air flow
m3/h
1,743/1,530/1,338
CFM
1,025/900/787
External static pressure
Pa
25 (0 - 100)
Indoor noise level
dB(A)
49/46/44
Refrigerant
Type
\
R410A
Control
\
Throttle valve
Design pressure
MPa
4.4/2.6
Refrigerant
pipe
Liquid side/ Gas side
mm
Ф9.52/Ф19.1
Max. equivalent
refrigerant pipe length
m
55
Max. difference in level m 46
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Notes:
1. The nominal T1 cooling capacities are based on the following conditions:
Indoor temperature: 27°CDB, 19°CWB; Outdoor temperature: 35°CDB, 24°C WB;
2. The nominal T3 cooling capacities are based on the following conditions:
Indoor temperature: 29°CDB, 19°CWB; Outdoor temperature: 46°CDB, 24°C WB;
3. The noise is measured in the semi noise suppression lab. The sound level is measured 1m below the unit.
Model
MTA-24WN1
Matched outdoor unit
MOVTB-24CN1-13C
Connecting
wire
Power wire (Indoor unit) \ 3×2.5mm2
Signal wire
\
2×0.75mm2
Drain pipe size (OD)
mm
Ф25
Controller \ Optional (220V signal reserved)
Operation temperature
°C
18 - 30
Dimension (W×H×D)
mm
1,230×270×775
Packing (W×H×D)
mm
1,355×350×795
Net/Gross weight
kg
38/44
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Model
MTA-36WN1
Matched outdoor unit
MOVTB-36CN1-13C
Power supply \ 220 - 240V~, 1Ph, 50Hz
Cooling (T1)
Capacity
Btu/h
35,000
W
10,258
Input
W
2,865
EER
W/W
3.58
Btu/h.W
12.2
Cooling (T3)
Capacity
Btu/h
30,200
W
8,851
Input
W
3,512
EER
W/W
2.52
Btu/h.W
8.6
Rated input
W
393
Rated current
A
1.8
Indoor
fan motor
Model (× quantity) \ YSK200-4P (×1)
Brand
\
Welling
Input (Hi/Med/Lo) W 393/332/278(/234)
Capacitor
\
10μF/450V
Speed (Hi/Med/Lo)
r/min
1,230/1,120/990(/880)
Indoor coil
Number of rows
\
4
Tube pitch(a)×row pitch(b)
mm
21×13.37
Fin space
mm
1.5
Fin type \ Hydrophilic aluminum fin
Tube size
mm
Ф7
Tube type \ Inner grooved copper pipe
Coil(W×H)
mm
955×336
Number of circuits
\
8
Indoor air flow
m3/h
1,850/1,675/1,472
CFM
1,088/985/866
External static pressure
Pa
37 (0 - 75)
Indoor noise level
dB(A)
51/49/46
Refrigerant
Type
\
R410A
Control
\
Throttle valve
Design pressure
MPa
4.4/2.6
Refrigerant
pipe
Liquid side/ Gas side
mm
Ф9.52/Ф19.1
Max. equivalent
refrigerant pipe length
m
55
Max. difference in level m 46
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Model
MTA-36WN1
Matched outdoor unit
MOVTB-36CN1-13C
Power supply \ 220 - 240V~, 1Ph, 50Hz
Connecting
wire
Power wire (Indoor unit) \ 3×2.5mm2
Signal wire
\
2×0.75mm2
Drain pipe size (OD)
mm
Ф25
Controller \ Optional (220V signal reserved)
Operation temperature
°C
18 - 30
Dimension (W×H×D)
mm
1,230×270×775
Packing (W×H×D)
mm
1,355×350×795
Net/Gross weight
kg
38/44
Notes:
1. The nominal T1 cooling capacities are based on the following conditions:
Indoor temperature: 27°CDB, 19°CWB; Outdoor temperature: 35°CDB, 24°C WB;
2. The nominal T3 cooling capacities are based on the following conditions:
Indoor temperature: 29°CDB, 19°CWB; Outdoor temperature: 46°CDB, 24°C WB;
3. The noise is measured in the semi noise suppression lab. The sound level is measured 1m below the unit.
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Model
MTA-36WN1
Matched outdoor unit
MOVTB-36CN1-R13C
Power supply \ 220 - 240V~, 1Ph, 50Hz
Cooling (T1)
Capacity
Btu/h
34,400
W
10,082
Input
W
2,970
EER
W/W
3.40
Btu/h.W
11.6
Cooling (T3)
Capacity
Btu/h
29,800
W
8,734
Input
W
3,634
EER
W/W
2.40
Btu/h.W
8.2
Rated input
W
393
Rated current
A
1.8
Indoor
fan motor
Model (× quantity) \ YSK200-4P (×1)
Brand
\
Welling
Input (Hi/Med/Lo) W 393/332/278(/234)
Capacitor \ 10μF/450V
Speed (Hi/Med/Lo)
r/min
1,230/1,120/990(/880)
Indoor coil
Number of rows
\
4
Tube pitch(a)×row pitch(b)
mm
21×13.37
Fin space
mm
1.5
Fin type \ Hydrophilic aluminum fin
Tube size
mm
Ф7
Tube type \ Inner grooved copper pipe
Coil(W×H)
mm
955×336
Number of circuits
\
8
Indoor air flow
m3/h
1,850/1,675/1,472
CFM
1,088/985/866
External static pressure
Pa
37 (0 - 75)
Indoor noise level
dB(A)
51/49/46
Refrigerant
Type
\
R410A
Control
\
Throttle valve
Design pressure
MPa
4.4/2.6
Refrigerant
pipe
Liquid side/ Gas side
mm
Ф9.52/Ф19.1
Max. equivalent
refrigerant pipe length
m
55
Max. difference in level m 46
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Model
MTA-36WN1
Matched outdoor unit
MOVTB-36CN1-R13C
Connecting
wire
Power wire (Indoor unit) \ 3×2.5mm2
Signal wire
\
2×0.75mm2
Drain pipe size (OD)
mm
Ф25
Controller \ Optional (220V signal reserved)
Operation temperature
°C
18 - 30
Dimension (W×H×D)
mm
1,230×270×775
Packing (W×H×D)
mm
1,355×350×795
Net/Gross weight
kg
38/44
Notes:
1. The nominal T1 cooling capacities are based on the following conditions:
Indoor temperature: 27°CDB, 19°CWB; Outdoor temperature: 35°CDB, 24°C WB;
2. The nominal T3 cooling capacities are based on the following conditions:
Indoor temperature: 29°CDB, 19°CWB; Outdoor temperature: 46°CDB, 24°C WB;
3. The noise is measured in the semi noise suppression lab. The sound level is measured 1m below the unit.
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Model
MTA-48WN1
Matched outdoor unit
MOVTB-48CN1-R13C
Power supply \ 220 - 240V~, 1Ph, 50Hz
Cooling (T1)
Capacity
Btu/h
48,000
W
14,068
Input
W
4,140
EER
W/W
3.40
Btu/h.W
11.6
Cooling (T3)
Capacity
Btu/h
41,500
W
12,163
Input
W
5,123
EER
W/W
2.37
Btu/h.W
8.1
Rated input
W
740
Rated current
A
3.27
Indoor
fan motor
Model (× quantity)
\
YSK400-4C-2 or YKSS-400-4-8 (×1)
Brand
\
Welling/Yongan
Input (Hi/Med/Lo)
W
(865/)701/621/545 or (930/)740/660/592
Capacitor
\
15μF/450V
Speed (Hi/Med/Lo)
r/min
(1,125/)995/915/850 or (1,080/)920/850/790
Indoor coil
Number of rows
\
4
Tube pitch(a)×row pitch(b)
mm
25.4×22
Fin space
mm
1.6
Fin type \ Hydrophilic aluminum fin
Tube size
mm
Ф9.52
Tube type \ Inner grooved copper pipe
Coil(W×H)
mm
996×355.6
Number of circuits
\
7
Indoor air flow
m3/h
2,759/2,536/2,332
CFM
1,623/1,492/1,372
External static pressure
Pa
50 (0 - 125)
Indoor noise level
dB(A)
52/51/50
Refrigerant
Type
\
R410A
Control
\
Throttle valve
Design pressure
MPa
4.4/2.6
Refrigerant
pipe
Liquid side/ Gas side
mm
Ф9.52/Ф22
Max. equivalent
refrigerant pipe length
m
55
Max. difference in level m 46
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Model
MTA-48WN1
Matched outdoor unit
MOVTB-48CN1-R13C
Connecting
wire
Power wire (Indoor unit) \ 3×2.5mm2
Signal wire
\
2×0.75mm2
Drain pipe size (OD)
mm
Ф25
Controller \ Optional (220V signal reserved)
Operation temperature
°C
18 - 30
Dimension (W×H×D)
mm
1,300×420×691
Packing (W×H×D)
mm
1,436×450×768
Net/Gross weight
kg
65.5/73
Notes:
1. The nominal T1 cooling capacities are based on the following conditions:
Indoor temperature: 27°CDB, 19°CWB; Outdoor temperature: 35°CDB, 24°C WB;
2. The nominal T3 cooling capacities are based on the following conditions:
Indoor temperature: 29°CDB, 19°CWB; Outdoor temperature: 46°CDB, 24°C WB;
3. The noise is measured in the semi noise suppression lab. The sound level is measured 1m below the unit.
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Model
MTA-60WN1
Matched outdoor unit
MOVTB-60CN1-R13C
Power supply \ 220 - 240V~, 1Ph, 50Hz
Cooling (T1)
Capacity
Btu/h
57,000
W
16,706
Input
W
4,870
EER
W/W
3.43
Btu/h.W
11.7
Cooling (T3)
Capacity
Btu/h
50,000
W
14,654
Input
W
6,173
EER
W/W
2.37
Btu/h.W
8.1
Rated input
W
930
Rated current
A
4.1
Indoor
fan motor
Model (× quantity)
\
YSK400-4C-2 or YKSS-400-4-8 (×1)
Brand
\
Welling/Yongan
Input (Hi/Med/Lo)
W
(865/)701/621/545 or (930/)740/660/592
Capacitor
\
15μF/450V
Speed (Hi/Med/Lo)
r/min
(1,125/)995/915/850 or (1,080/)920/850/790
Indoor coil
Number of rows
\
4
Tube pitch(a)×row pitch(b)
mm
25.4×22
Fin space
mm
1.6
Fin type \ Hydrophilic aluminum fin
Tube size
mm
Ф9.52
Tube type \ Inner grooved copper pipe
Coil(W×H)
mm
996×355.6
Number of circuits
\
7
Indoor air flow
m3/h
3,312/2,759/2,536
CFM
1,948/1,623/1,492
External static pressure
Pa
50 (0 - 125)
Indoor noise level
dB(A)
54/52/51
Refrigerant
Type
\
R410A
Control
\
Throttle valve
Design pressure
MPa
4.4/2.6
Refrigerant
pipe
Liquid side/ Gas side
mm
Ф9.52/Ф22
Max. equivalent
refrigerant pipe length
m
55
Max. difference in level m 46
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Model
MTA-60WN1
Matched outdoor unit
MOVTB-60CN1-R13C
Connecting
wire
Power wire (Indoor unit) \ 3×2.5mm2
Signal wire
\
2×0.75mm2
Drain pipe size (OD)
mm
Ф25
Controller \ Optional (220V signal reserved)
Operation temperature
°C
18 - 30
Dimension (W×H×D)
mm
1,300×420×691
Packing (W×H×D)
mm
1,436×450×768
Net/Gross weight
kg
65.5/73
Notes:
1. The nominal T1 cooling capacities are based on the following conditions:
Indoor temperature: 27°CDB, 19°CWB; Outdoor temperature: 35°CDB, 24°C WB;
2. The nominal T3 cooling capacities are based on the following conditions:
Indoor temperature: 29°CDB, 19°CWB; Outdoor temperature: 46°CDB, 24°C WB;
3. The noise is measured in the semi noise suppression lab. The sound level is measured 1m below the unit.
3. Dimensions
MTA-18WN1 (Unit: mm)
Air outlet side view
Air inlet side view
MCAC-UTSM-201707 Midea Tropical R410A High Efficient Duct Technical Manual 50Hz
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Top view
Left side view
Midea Tropical R410A High Efficient Duct Technical Manual 50Hz MCAC-UTSM-201707
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MTA-24WN1, MTA-36WN1 (Unit: mm)
Air outlet side view
Air inlet side view
Top view
MCAC-UTSM-201707 Midea Tropical R410A High Efficient Duct Technical Manual 50Hz
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Left side view
(Unit: mm)
Model
Outline dimension
Air outlet opening size
A B C D E F G H I
MTA-24WN1
1,140
270
775
710
1,230
65
933
35
179
MTA-36WN1
1,140
270
775
710
1,230
65
933
35
179
(Unit: mm)
Model
Air return opening size
Size of mounted lug
Fresh air inlet
J K L M N O P T MTA-24WN1
1,035
260
20
1,180
490
26
20
Φ125
MTA-36WN1
1,035
260
20
1,180
490
26
20
Φ125
Midea Tropical R410A High Efficient Duct Technical Manual 50Hz MCAC-UTSM-201707
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MTA-48WN1, MTA-60WN1 (Unit: mm)
Air outlet side view
Air inlet side view
Connecting pipe side view
MCAC-UTSM-201707 Midea Tropical R410A High Efficient Duct Technical Manual 50Hz
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Top view
A view
Midea Tropical R410A High Efficient Duct Technical Manual 50Hz MCAC-UTSM-201707
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4. Service Space
Top view
5. Refrigerant circuit
MCAC-UTSM-201707 Midea Tropical R410A High Efficient Duct Technical Manual 50Hz
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6. Wiring Diagrams
MTA-18WN1 (Other thermostat with 220V signal)
Midea Tropical R410A High Efficient Duct Technical Manual 50Hz MCAC-UTSM-201707
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MTA-24WN1 (Other thermostat with 220V signal)
MCAC-UTSM-201707 Midea Tropical R410A High Efficient Duct Technical Manual 50Hz
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MTA-36WN1 (Other thermostat with 220V signal)
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