Midea Atom Series VRF Indoor Units
Engineering Data
Commercial Air Conditioners
Model Series: Atom Series
Type: Wall-mounted VRF IDU
Refrigerant: R410A
Model List
- MDV-D07G/N1-M(At)
- MDV-D09G/N1-M(At)
- MDV-D12G/N1-M(At)
- MDV-D15G/N1-M(At)
- MDV-D18G/N1-M(At)
- MDV-D24G/N1-M(At)
- MDV-D28G/N1-M(At)
- MDV-D32G/N1-M(At)
1 Specifications
Detailed specifications for the Midea Atom Series VRF Indoor Units are provided in the following tables, covering cooling and heating capacities, fan motor type, air flow rates, unit dimensions, and refrigerant details.
Table 1.1: MDV-D07(09,12,15)G/N1-M(At) Specifications
| Model (MDV-) | D07G/N1-M(At) | D09G/N1-M (At) | D12G/N1-M(At) | D15G/N1-M (At) |
|---|---|---|---|---|
| Power supply | 1 phase, 220-240V, 50Hz | |||
| Cooling Capacity (kBtu/h) | 7 | 9 | 12 | 15 |
| Cooling Power input (W) | 29 | 29 | 31 | 45 |
| Heating Capacity (kBtu/h) | 8 | 10 | 13 | 17 |
| Heating Power input (W) | 29 | 29 | 31 | 45 |
| Fan Motor Type | AC | |||
| Air flow rate (m³/h) | 446/429/424/409/ 394/382/373 | 457/445/433/421/4 /339/333/303 | 447/429/399/369 /339/333/303 | 648/618/582/563/ 546/505/476 |
| Number of rows | 1 | 1 | 1 | 2 |
| Tube pitch x row pitch (mm) | 21x13.37 | |||
| Fin spacing (mm) | 1.3 | |||
| Fin type | Hydrophilic aluminum | |||
| Unit Coil Tube OD and type | Φ7 Inner-groove | |||
| Dimensions (LxH xW) (mm) | 585×315×13.37 | 585×315×13.37 | 585×315×126.74 | 701×315×26.74 |
| Number of circuits | 2 | 3 | 5 | 5 |
| External Static Pressure (Pa) | 0 | 0 | 0 | 0 |
| Sound pressure level (dB(A)) | 34/33/33/32/32/31/31 | 33/33/32/32/31/31 | 36/35/34/33/32/32 | 37/36/34/34/33/32 |
| Net dimensions (WxHxD) (mm) | 835×280×203 | 990×315×223 | ||
| Packed dimensions (WxHxD) (mm) | 915x353x300 | 1075x395x300 | ||
| Net/Gross weight (kg) | 8.5/11.0 | 8.5/11.0 | 9.7/12.2 | 13.8/16.4 |
| Refrigerant type | R410A | |||
| Design pressure (H/L) (MPa) | 4.4/2.6 | |||
| Pipe connection (Liquid/Gas pipe) (mm) | Φ6.35/Φ12.7 | |||
| Drain pipe (mm) | OD 16 | |||
Table 1.2: MDV-D18(24,28,32)G/N1-M(At) Specifications
| Model (MDV-) | D18G/N1-M (At) | D24G/N1-M(At) | D28G/N1-M (At) | D32G/N1-M (At) |
|---|---|---|---|---|
| Power supply | 1 phase, 220-240V, 50Hz | |||
| Cooling Capacity (kBtu/h) | 19 | 24 | 27 | 30 |
| Cooling Power input (W) | 54 | 77 | 77 | 90 |
| Heating Capacity (kBtu/h) | 21 | 27 | 30 | 34 |
| Heating Power input (W) | 54 | 77 | 77 | 90 |
| Fan Motor type | AC | |||
| Air flow rate (m³/h) | 798/764/723/691/ 665/627/595 | 1240/1171/1107/1 045/976/914/869 | 1248/1194/1119/1 056/993/914/863 | 1427/1403/1303/12 32/1186/1096/1043 |
| Number of rows | 2 | 2 | 2 | 2 |
| Tube pitch x row pitch (mm) | 21x13.37 | |||
| Fin spacing (mm) | 1.3 | |||
| Fin type | Hydrophilic aluminum | |||
| Unit Coil Tube OD and type | Φ7 Inner-groove | |||
| Dimensions (LxH xW) (mm) | 701×315×26.74 | 825×399×26.74 | 825×399×26.74 | 825×399×26.74 |
| Number of circuits | 5 | 5 | 6 | 5 |
| External Static Pressure (Pa) | 0 | 0 | 0 | 0 |
| Sound pressure level (dB(A)) | 42/41/40/39/38/37/36 | 48/47/45/44/42/39/38 | 48/47/45/43/42/39/38 | 52/51/50/49/47/45/43 |
| Net dimensions (WxHxD) (mm) | 990×315×223 | 1194×343×262 | ||
| Packed dimensions (WxHxD) (mm) | 1075x395x300 | 1265x420x345 | ||
| Net/Gross weight (kg) | 13.8/16.4 | 17.4/20.8 | 17.6/21.0 | 17.6/21.0 |
| Refrigerant type | R410A | |||
| Pipe connection (Liquid/Gas pipe) (mm) | Φ9.53/Φ15.9 | |||
| Drain pipe (mm) | OD 16 | |||
Notes:
- Cooling conditions: Indoor 27°C DB, 19°C WB; Outdoor 35°C DB; Equivalent refrigerant piping length 7.5m with zero level difference.
- Heating conditions: Indoor 20°C DB; Outdoor 7°C DB, 6°C WB; Equivalent refrigerant piping length 7.5m with zero level difference.
- Fan motor speed and air flow rate are from highest to lowest speed, total 7 rates for each model.
- Sound pressure level is from highest to lowest level, total 7 levels for each model. Sound pressure level is measured in a semi-anechoic chamber.
- Unit body dimensions are the largest external dimensions of the unit, including hanger attachments.
2 Dimensions
2.1 Unit Dimensions
The following figures illustrate the wall-mounted dimensions for the Midea Atom Series VRF Indoor Units in millimeters.
Figure 2.1: Wall mounted dimensions (unit: mm)
MDV-D07G/N1-M(At), MDV-D09G/N1-M(At), MDV-D12G/N1-M(At):
[Diagram showing dimensions for smaller units]
MDV-D15G/N1-M(At), MDV-D18G/N1-M(At):
[Diagram showing dimensions for mid-size units]
MDV-D24G/N1-M(At), MDV-D28G/N1-M(At), MDV-D32G/N1-M(At):
[Diagram showing dimensions for larger units]
3 Indoor Unit Installation
3.1 Choosing an Installation Site
Unit placement should consider the following:
- Avoid locations with high-temperature heat sources or electromagnetic interference.
- Avoid dusty or dirty environments that could affect heat exchangers.
- Avoid exposure to oil, corrosive gases (acidic/alkaline), or salinity.
- Avoid locations with highly flammable materials.
- Avoid areas with oily air (e.g., kitchens) or very high humidity (e.g., laundry rooms).
Units should be installed in positions where:
- The ceiling is horizontal and can support the unit's weight.
- There are no obstructions to the unit's airflow (inlet and outlet).
- The outlet airflow can reach throughout the room.
- There is sufficient space for installation, servicing, and maintenance.
- Refrigerant and drain piping can be easily connected.
- Short-circuit ventilation (where outlet air returns quickly to the unit's air inlet) is avoided.
3.2 Drill and Mount the rack for the indoor unit
3.2.1 Mounting the Rack of the indoor unit
Select the installation location, place the installation panel from the back of the indoor unit onto the wall, ensuring it is level. Determine the positions for wall holes to secure the panel.
Correct Installation Method
[Diagram illustrating correct rack installation with unit level]
Wrong Installation
[Diagram illustrating incorrect rack installation, not level]
[Diagram illustrating another incorrect rack installation, not level]
3.2.2 Installation on Wood-based structure
- Ensure wooded walls are strong enough.
- Determine upper and lower positions for the installation panel based on the distance between the indoor unit and the ceiling.
- Adjust left and right side positions with reference to the panel's screw holes.
- Fix the installation panel using self-tapping screws.
3.2.3 Installation on Concrete Structure
- Drill holes in the wall and embed plastic expansion pipes, referencing the installation panel.
- Fix the installation panel using self-tapping screws.
3.2.4 Indoor Unit Installation
- Pass bundled pipelines and connection lines through the wall hole, ensuring pipes are not damaged and are sand/dust-free.
- Hang the upper jaw at the back of the indoor unit onto the upper hooker of the installation panel. Check for secure hanging by shifting the unit left and right.
- Push the lower part of the indoor unit against the wall. Shift the unit body up/down and left/right to confirm secure connection.
- Place a shock-absorbing material between the unit and the wall to support it. Remove this material after piping installation. Ensure the unit is securely buckled into the slots. Test by shaking the unit to ensure it does not move. Use a spirit level to verify the unit is level.
[Diagram showing hooker and cushioning material placement]
4 Piping Diagram
Figure 4.1: Wall mounted piping diagram
[Diagram illustrating the piping connections within the unit, including motor, fan, heat exchanger, EXV, and sensors T1, T2, T2B]
Legend:
- T1: Indoor ambient temperature sensor
- T2: Indoor heat exchanger mid-point temperature sensor
- T2B: Indoor heat exchanger outlet temperature sensor
Connections include flare nuts for gas and liquid sides.
5 Wiring Diagram
Wiring diagrams are provided for different capacity ranges:
Figure 5.1: 7.0/9.0/12.0kBtu/h Wall mounted wiring diagram
[Diagram showing the wiring for smaller capacity units, including components like FM, GM, EEV, T1, T2, T2B, display panel, wired controller, and various connectors (CN, XP, XS)]
Component Codes:
- FM: Indoor fan motor
- GM: Swing motor
- EEV: Electronic expansion valve
- T1: Indoor ambient temp. sensor
- T2: Indoor heat exchanger mid-point temp. sensor
- T2B: Indoor heat exchanger outlet temp. sensor
- CS: Water level switch
Factory Information:
- Factory code: 16026000017624
- Date: 2020.03.14
- Revision: B
Figure 5.2: 15.0/18.0kBtu/h Wall mounted wiring diagram
[Diagram showing the wiring for mid-capacity units, similar to Figure 5.1 but with specific component layouts]
Component Codes:
- FM: Indoor fan motor
- GM: Swing motor
- EEV: Electronic expansion valve
- T1: Indoor ambient temp. sensor
- T2: Indoor heat exchanger mid-point temp. sensor
- T2B: Indoor heat exchanger outlet temp. sensor
- CS: Water level switch
- C: Capacitor
Factory Information:
- Factory code: 16026000017616
- Date: 2020.03.14
- Revision: B
Figure 5.3: 24.0/28.0/32.0kBtu/h Wall mounted wiring diagram
[Diagram showing the wiring for larger capacity units, similar to previous figures but with specific component layouts]
Component Codes:
- FM: Indoor fan motor
- GM: Swing motor
- EEV: Electronic expansion valve
- T1: Indoor ambient temp. sensor
- T2: Indoor heat exchanger mid-point temp. sensor
- T2B: Indoor heat exchanger outlet temp. sensor
- CS: Water level switch
- C: Capacitor
Factory Information:
- Factory code: 16026000017621
- Date: 2020.03.14
- Revision: B
6 Capacity Tables
6.1 Cooling Capacity Table
Table 6.1 provides the cooling capacity in kW for various indoor and outdoor temperature conditions.
| Model | 14/20 | 16/23 | 18/26 | 19/27 | 20/28 | 22/30 | 24/32 | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| TC | SC | TC | SC | TC | SC | TC | SC | TC | SC | TC | SC | TC | SC | |
| MDV-D07G/N1-M(At) | 2.0 | 2.0 | 2.1 | 2.0 | 2.2 | 2.0 | 2.2 | 1.9 | 2.3 | 1.9 | 2.3 | 1.7 | 2.4 | 1.7 |
| MDV-D09G/N1-M(At) | 2.5 | 2.5 | 2.7 | 2.6 | 2.8 | 2.5 | 2.8 | 2.4 | 2.9 | 2.4 | 2.9 | 2.2 | 3.0 | 2.1 |
| MDV-D12G/N1-M(At) | 3.2 | 3.2 | 3.4 | 3.2 | 3.6 | 3.2 | 3.6 | 3.0 | 3.7 | 3.0 | 3.8 | 2.8 | 3.9 | 2.7 |
| MDV-D15G/N1-M(At) | 4.0 | 3.9 | 4.3 | 3.9 | 4.5 | 3.9 | 4.5 | 3.7 | 4.6 | 3.6 | 4.7 | 3.4 | 4.8 | 3.3 |
| MDV-D18G/N1-M(At) | 5.0 | 4.8 | 5.3 | 4.8 | 5.6 | 4.8 | 5.6 | 4.6 | 5.7 | 4.5 | 5.8 | 4.2 | 6.0 | 4.1 |
| MDV-D24G/N1-M(At) | 6.3 | 6.2 | 6.7 | 6.1 | 7.0 | 6.1 | 7.1 | 5.9 | 7.2 | 5.7 | 7.4 | 5.4 | 7.6 | 5.2 |
| MDV-D28G/N1-M(At) | 7.1 | 6.9 | 7.6 | 7.0 | 7.9 | 6.8 | 8.0 | 6.6 | 8.1 | 6.4 | 8.3 | 6.1 | 8.5 | 5.8 |
| MDV-D32G/N1-M(At) | 8.0 | 7.9 | 8.5 | 7.9 | 8.9 | 7.8 | 9.0 | 7.5 | 9.1 | 7.2 | 9.4 | 6.9 | 9.6 | 6.6 |
6.2 Heating Capacity Table
Table 6.2 provides the heating capacity in kW for various indoor temperatures.
| Model | 16 | 18 | 20 | 21 | 22 | 24 |
|---|---|---|---|---|---|---|
| TC | TC | TC | TC | TC | TC | |
| MDV-D07G/N1-M(At) | 2.6 | 2.6 | 2.4 | 2.3 | 2.3 | 2.1 |
| MDV-D09G/N1-M(At) | 3.4 | 3.4 | 3.2 | 3.1 | 3.0 | 2.8 |
| MDV-D12G/N1-M(At) | 4.2 | 4.2 | 4.0 | 3.8 | 3.8 | 3.5 |
| MDV-D15G/N1-M(At) | 5.3 | 5.3 | 5.0 | 4.8 | 4.7 | 4.4 |
| MDV-D18G/N1-M(At) | 6.7 | 6.6 | 6.3 | 6.1 | 5.9 | 5.5 |
| MDV-D24G/N1-M(At) | 8.5 | 8.4 | 8.0 | 7.8 | 7.5 | 7.0 |
| MDV-D28G/N1-M(At) | 9.5 | 9.5 | 9.0 | 8.7 | 8.5 | 7.8 |
| MDV-D32G/N1-M(At) | 10.6 | 10.5 | 10.0 | 9.7 | 9.4 | 8.8 |
Abbreviations:
- TC: Total capacity (kW)
- SC: Sensible capacity (kW)
Notes: Shaded cells indicate rating condition.
7 Electrical Characteristics
Table 7.1: Wall mounted electrical characteristics
| Model | Power supply | Indoor fan motors | ||||||
|---|---|---|---|---|---|---|---|---|
| Hz | Volts | Min. volts | Max. volts | MCA | MFA | Rated motor output (kW) | FLA | |
| MDV-D07G/N1-M(At) | 50 | 220-240 | 198 | 264 | 0.32 | 15 | 0.02 | 0.2 |
| MDV-D09G/N1-M(At) | 50 | 220-240 | 198 | 264 | 0.32 | 15 | 0.02 | 0.2 |
| MDV-D12G/N1-M(At) | 50 | 220-240 | 198 | 264 | 0.45 | 15 | 0.02 | 0.23 |
| MDV-D15G/N1-M(At) | 50 | 220-240 | 198 | 264 | 0.47 | 15 | 0.045 | 0.35 |
| MDV-D18G/N1-M(At) | 50 | 220-240 | 198 | 264 | 0.58 | 15 | 0.045 | 0.4 |
| MDV-D24G/N1-M(At) | 50 | 220-240 | 198 | 264 | 0.90 | 15 | 0.05 | 0.45 |
| MDV-D28G/N1-M(At) | 50 | 220-240 | 198 | 264 | 0.90 | 15 | 0.05 | 0.45 |
| MDV-D32G/N1-M(At) | 50 | 220-240 | 198 | 264 | 1.10 | 15 | 0.05 | 0.52 |
Abbreviations:
- MCA: Minimum Circuit Amperes
- MFA: Minimum Fuse Amperes
- FM: Indoor Fan Motor
- kW: Rated motor output
- FLA: Full Load Amperes
8 Sound Levels
8.1 Overall
Table 8.1 presents the sound pressure levels in dB(A) for the wall-mounted units under various conditions.
| Model name | SSH | SH | H | M | L | SL | SSL |
|---|---|---|---|---|---|---|---|
| MDV-D07G/N1-M(At) | 34 | 33 | 33 | 32 | 32 | 31 | 31 |
| MDV-D09G/N1-M(At) | 34 | 33 | 32 | 32 | 31 | 31 | 31 |
| MDV-D12G/N1-M(At) | 36 | 35 | 34 | 33 | 32 | 32 | 32 |
| MDV-D15G/N1-M(At) | 37 | 36 | 34 | 34 | 33 | 32 | 31 |
| MDV-D18G/N1-M(At) | 42 | 41 | 40 | 39 | 38 | 37 | 36 |
| MDV-D24G/N1-M(At) | 48 | 47 | 45 | 44 | 42 | 39 | 38 |
| MDV-D28G/N1-M(At) | 48 | 47 | 45 | 43 | 42 | 39 | 38 |
| MDV-D32G/N1-M(At) | 52 | 51 | 50 | 49 | 47 | 45 | 43 |
Notes: Sound pressure levels are measured in a semi-anechoic chamber. During in-situ operation, sound pressure levels may be higher as a result of ambient noise.
Figure 8.1: Wall mounted sound pressure level measurement
[Diagram illustrating the setup for measuring sound pressure levels with a microphone at 1m distance from a wall-mounted unit]
8.2 Octave Band Levels
The following graphs show the octave band sound pressure levels for different models:
- MDV-D07G/N1-M(At)
- MDV-D09G/N1-M(At)
- MDV-D12G/N1-M(At)
- MDV-D15G/N1-M(At)
- MDV-D18G/N1-M(At)
- MDV-D24G/N1-M(At)
- MDV-D28G/N1-M(At)
- MDV-D32G/N1-M(At)
[Graphs showing octave band sound pressure levels for each model, with various NR curves and sound level indicators (SSH, SH, H, M, L, SL, SSL)]
