Midea ATOM B Series User manual



Model:

B Series

MDV‐V28WDHN1(AtB)

MDV‐V36WDHN1(AtB)

MDV‐V42WDHN1(AtB)

MDV‐V48WDHN1(AtB)

MDV‐V56WDHN1(AtB)

MDV‐V60WDHN1(AtB)

CommercialAirConditioners

R410A

Service

Manual



AtomBSeriesVRF50/60Hz

1

CONTENTS



CONTENTS



Part 1 General Information............................................................................3

Part 2 Component Layout and Refrigerant Circuits.....................................7

Part 3 Control...............................................................................................15

Part 4 Field Settings.....................................................................................23

Part 5 Electrical Components and Wiring Diagrams..................................32

Part 6 Diagnosis and Troubleshooting.........................................................45



AtomBSeriesVRF50/60Hz  

2  

MideaAtomBSeriesServiceManual



Atom B Series VRF 50/60Hz

Part 1 – General Information

Part 1

General Information

1 Indoor and Outdoor Unit Capacities........................................................... 4

2 External Appearance.................................................................................. 5

3 Combination Ratio..................................................................................... 6

Atom B Series VRF 50/60Hz

Midea Atom B Series Service Manual

1Indoor and Outdoor Unit Capacities

1.1 Indoor Units

Table 1-1.1: Indoor unit abbreviation codes

Abbreviation code

Type

One-way Cassette

Q4C

Compact Four-way Cassette

Four-way Cassette

High Static Pressure Duct

Medium Static Pressure Duct

Wall-mounted

Ceiling and Floor

Table 1-1.2: Indoor unit capacity range

Capacity

index

Q4C

T2(Arc)

kBtu/h

1.5

0.5

—

1.8

0.6

—

2.2

0.8

—

2.8

—

3.6

1.25

—

4.5

1.6

—

5.6

—

7.1

2.5

—

8.0

—

9.0

3.2

—

10.0

3.6

—

11.2

—

14.0

—

16.0

—

56(DC)

—

Notes:

1. Atom series indoor units could connect to Atom series outdoor units.

1.2 Outdoor Units

Table 1-1.3: Outdoor unit capacity range

Capacity (kBtu/h)

Model Name

MDV-V28WDHN1(AtB)

MDV-V36WDHN1(AtB)

MDV-V42WDHN1(AtB)

MDV-V48WDHN1(AtB)

MDV-V56WDHN1(AtB)

MDV-V60WDHN1(AtB)

Notes:

1. Atom series outdoor units could not be combined.

Atom B Series VRF 50/60Hz

Part 1 – General Information

2External Appearance

2.1 Indoor Units

Table 1-2.1: Indoor unit appearance

One-way Cassette

Four-way Cassette

Compact Four-way Cassette

Wall-mounted

Q4C

High Static Pressure Duct

Medium Static Pressure Duct

Medium Static Pressure Duct (Arc Series Duct)

Ceiling and Floor

2.2 Outdoor Units

Table 1-2.2: Outdoor unit appearance

28kBtu/h

36/42/48/56kBtu/h

60kBtu/h

Atom B Series VRF 50/60Hz

Midea Atom B Series Service Manual

3Combination Ratio

Table 1-3.1: Indoor and outdoor unit combination ratio limitations

Type

Minimum combination ratio

Maximum combination ratio

Atom Series outdoor units

45%

130%

Table 1-3.2: Combinations of Indoor and outdoor units

Outdoor unit capacity

Sum of capacity indexes of

connected indoor units (standard

indoor units only)

Number of connected

indoor units

kBtu/h

Capacity

index

12.6 to 36.4

1-4

16.2 to 46.8

1-6

18.9 to 54.6

1-7

21.6 to 62.4

1-8

25.2 to 72.8

1-9

27.0 to 78.0

1-9

Combination ratio =

Sum of capacity indexes of the indoor units

Capacity index of the outdoor unit

‐i   AtomBSeriesVRF50/60Hz

7

Part2–ComponentLayoutandRefrigerantCircuits

Part2

ComponentLayoutand

RefrigerantCircuits



1PipingDiagrams.........................................................................................8

2RefrigerantFlowDiagrams.......................................................................11





AtomBSeriesVRF50/60Hz  

8  

MideaAtomBSeriesServiceManual

1 PipingDiagrams

Figure2‐1.1:28modelpipingdiagram



Figure2‐1.2:36modelpipingdiagram



Oil

return

hole

Temperature

sensor

Distributor

Liquid pipe

Temperature

sensor

4 way valve

Gas pipe

Compressor

Temperature

sensor

Low pressure switch

Accumulator

Refrigerant

radiator

module

Temperature

sensor

Filter

Oil return capiliary

Oil seperator

DC motor

Silencer

High pressure switch

Temperature

sensor

Distributor

Liquid pipe

Temperature

sensor

4 way valve

DC motor

Gas pipe

Compressor

Temperature

sensor

Low pressure switch

ccumulator

Refrigerant

radiator

module

Temperature

sensor

Filter

Oil return capiliary

Oil sepetator

‐i   AtomBSeriesVRF50/60Hz

9

Part2–ComponentLayoutandRefrigerantCircuits

Figure2‐1.3:42modelpipingdiagram



Figure2‐1.3:48/56modelpipingdiagram







High pressure

switch

Temperature

sensor

Distributor

Liquid pipe

Temperature

sensor

4 way valve

DC motor

Gas pipe

Compressor

Temperature

sensor

Low pressure switch

Accumulator

Refrigerant

radiator

module

Temperature sensor

Oil return capiliary

Oil seperator

Filter

Electronic

expansion

valve



High pressure

switch

Temperature

sensor

Distributor

Liquid pipe

Temperature

sensor

4 way valve

DC motor

Gas pipe

Compressor

Temperature

sensor

Low pressure switch

Accumulator

Refrigerant

radiator

module

Temperature sensor

Oil return capiliary

Oil seperator

Filter

Electronic

expansion

valve

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