Midea MTA-18WN1 Operating 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:
MCAC-UTSM-201707
Technical Service Manual
Split AC
iOS Version Android Version
Midea CAC After-service Application
iOS Version
Midea CAC News Application
Add.: Midea Headquarters Building, 6 Midea Avenue, Shunde, Foshan, Guangdong, China
Postal code: 528311
Tel: [phone] Fax: [phone]
cac.midea.com global.midea.com
Note: Product specifications change from time to time as product improvements and
developments are released and may vary from those in this document.
Commercial Air Conditioner Division
Midea Group

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 R410AHigh 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

MCAC-UTSM-201707Midea Tropical R410A High Efficient Duct Technical Manual 50Hz
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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

Midea Tropical R410AHigh Efficient Duct Technical Manual 50Hz MCAC-UTSM-201707
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2.2 Outdoor unit
3. Nomenclature
3.1 Indoor unit:
MTA–18 WN1
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 –R13 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

MCAC-UTSM-201707Midea Tropical R410A High Efficient Duct Technical Manual 50Hz
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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.

Midea Tropical R410AHigh Efficient Duct Technical Manual 50Hz MCAC-UTSM-201707
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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.).

MCAC-UTSM-201707Midea Tropical R410A High Efficient Duct Technical Manual 50Hz
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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

Midea Tropical R410AHigh Efficient Duct Technical Manual 50Hz MCAC-UTSM-201707
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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.

MCAC-UTSM-201707Midea Tropical R410A High Efficient Duct Technical Manual 50Hz
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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