Midea MDV-V235WN1(AU)-A VRF 50Hz Outdoor Unit Engineering Data

1 Specifications

Notes:

• 1. Cooling capacity and input are based on: Indoor temperature 20°C DB; outdoor temperature 7°C DB, 6°C WB; equivalent refrigerant piping length 7.5m with zero level difference.
• 2. Heating capacity and input are based on: Indoor temperature 27°C DB, 19°C WB; outdoor temperature 35°C DB; equivalent refrigerant piping length 7.5m with zero level difference.
• 3. Sound level is a conversion value from an anechoic chamber, measured at a point 1 meter in front of the unit at a height of 1 meter. During actual operation, these values are normally somewhat higher as a result of ambient conditions.

2 Dimensions

The outdoor unit has the following dimensions:

• Overall Unit: Height: 1558 mm, Width: 1120 mm, Depth: 528 mm.
• Packing: Height: 1720 mm, Width: 1270 mm, Depth: 565 mm.
• The base structure supporting the unit measures approximately 668 mm x 400 mm, with a height of 440 mm.

[Diagram Description: A visual representation of the outdoor unit showing its external dimensions. The main body is 1558mm high and 1120mm wide. The depth is 528mm. A base structure is also depicted with dimensions 668mm by 400mm and 440mm height.]

3 Installation Space Requirements

Proper clearance is required around the outdoor unit for optimal airflow and performance. The following clearances are recommended:

• Air Inlet: Minimum 300 mm clearance on sides.
• Air Outlet: Minimum 600 mm clearance at the rear and 1000 mm clearance in front.
• Ensure electric wires and pipelines are maintained clear of obstructions.

Ground Installation Clearances:

• Front: >3000 mm
• Sides: >1000 mm (one side), >300 mm (other side)
• Rear: >600 mm
• Between Units (if multiple): >6000 mm (side-by-side), >4000 mm (other side)

[Diagram Description: Multiple diagrams illustrate installation clearances. A top view shows air inlets requiring >300mm and air outlets requiring >600mm (rear) and >1000mm (front). Side views show units being secured to a foundation using bolts. Ground layout diagrams specify minimum clearances from walls or other units: >3000mm in front, >1000mm on one side, >300mm on the other side, and >600mm at the rear. Base installation diagrams show similar side and front clearances.]

4 Piping Diagrams

The piping diagram illustrates the refrigerant flow and key components within the outdoor unit.

[Diagram Description: A schematic diagram shows the internal piping of the outdoor unit. Key components include: Oil separator (OS) for separating oil from refrigerant; Gas-liquid separator for storing refrigerant and protecting the compressor; Electronic Expansion Valve (EEV) for controlling refrigerant flow; Four-way valve (ST1) for directing refrigerant flow between cooling and heating modes; Compressor (ACC); Fans (GLQ2, GLQ3); and various temperature sensors (T3, T4, T5, TL) and pressure switches (HPS, LPS). Solenoid valves (SV5, SV6) are also shown.]

Key Components:

1. Oil separator: Separates oil from gas refrigerant pumped out of the compressor and returns it to the compressor. Separation efficiency is up to 99%.
2. Gas-liquid separator: Stores liquid refrigerant and oil to protect the compressor from liquid hammering.
3. Electronic expansion valve (EEV): Controls refrigerant flow and reduces refrigerant pressure.
4. Four-way valve: Controls refrigerant flow direction. It is closed in cooling mode and open in heating mode. When closed, the heat exchanger acts as a condenser; when open, it acts as an evaporator.
5. High and low pressure switches: Regulate system pressure. If system pressure rises above the upper limit or falls below the lower limit, these switches turn off the compressor. The compressor restarts after 5 minutes.

5 Wiring Diagrams

The wiring diagram details the electrical connections for the outdoor unit.

[Diagram Description: A detailed wiring diagram shows connections to the Main Control Board, AC Filter Board, Compressor (COMP.), Fans (FAN1, FAN2), and various sensors and switches. Key connection points include terminal blocks (XT1, XT2), various connectors (CN1-CN24, CN501, CN502), and DIP switches (SW1, SW2, S1, S2). The diagram indicates power input, fan connections, compressor connections, sensor inputs, and control signals. DIP switch settings are explained for functions like forced cooling, network address, and operating modes (priority, cooling/heating only).]

Key Components and Controls:

• Terminal Blocks (XT1, XT2): For power and external connections.
• Main Control Board: Central processing unit for the unit.
• AC Filter Board: Manages AC power filtering.
• Compressor (COMP.): The main component for refrigeration cycle.
• Fans (FAN1, FAN2): For heat exchange.
• Sensors (T3, T4, T5, TF, TL): Monitor various temperatures.
• Switches (H-PRO, L-PRO, STF1, SV5/SV6): High/low pressure switches, four-way valve, and solenoid valves.
• DIP Switches (SW1, SW2, S1, S2): Used for setting operational modes, network addresses, and functions like forced cooling. Specific settings for S1 (protocol adaptation, address clearing) and S2 (priority modes, cooling/heating only) are detailed.

6 Electrical Characteristics

Abbreviations:

• MCA: Minimum Circuit Amps
• TOCA: Total Over-current Amps
• MFA: Maximum Fuse Amps
• MSC: Maximum Starting Current (A)
• RLA: Rated Load Amps
• FLA: Full Load Amps

Notes:

• 1. Units are suitable for use on electrical systems where voltage supplied to unit terminals is not below or above listed range limits. Maximum allowable voltage variation between phases is 2%.
• 2. Select wire size based on the value of MCA.
• 3. TOCA indicates the total overcurrent amps value of each OC set.
• 4. MFA is used to select overcurrent circuit breakers and residual-current circuit breakers.
• 5. MSC indicates the maximum current on compressor start-up in amps.
• 6. RLA is based on the following conditions: indoor temperature 27°C DB, 19°C WB; outdoor temperature 35°C DB.

7 Operating Limits

Condensate might form on the unit's surface if the humidity is above 80%.

Notes:

• 1. If the unit is running outside the above conditions, a protective device will start, potentially causing abnormal operation.
• 2. These figures are based on operation conditions between indoor and outdoor units with an equivalent pipe length of 5m and zero height difference.

Precaution:

• The indoor relative humidity should be lower than 80%. If the air conditioner operates in an environment with relative humidity higher than mentioned above, the surface of the air conditioner may condensate. In this case, it is recommended to set the air speed of the indoor unit to high.

8 Sound Levels

Note: Sound pressure level is measured at a position 1 meter in front of the unit and 1 meter above the floor in a semi-anechoic chamber. During in-situ operation, sound pressure levels may be higher as a result of ambient noise.

[Diagram Description: A diagram illustrates the sound level measurement setup, showing the outdoor unit and a measurement point located 1 meter in front of it and 1 meter above the floor.]

9 Accessories