Plus Service Manual - Midea Vrf V4
Check tightness of all electrical terminations on the main contactors, terminal blocks, and inverter modules.
Broken PQ line; external electromagnetic interference; indoor unit powered down.
For the V4 Plus , the manual includes extensive water circuit precautions. It is critical to confirm all water pipelines are correct, including the installation directions of water filters and water flow switches. The manual also notes that a gate valve must be opened, and the water pump and air discharge valve operated to ensure all air has been drained from the system before closing the air discharge valve.
| Specification | Details | | :--- | :--- | | | 380-415V / 3 Phase / 50Hz | | Cooling Capacity (kW) | 28.0 | | Heating Capacity (kW) | 31.5 | | Net Dimensions (mm) | 780 (W) x 1000 (H) x 550 (D) | | Net Weight (kg) | 146 | | Refrigerant | R410A | | Sound Pressure Level (dB(A)) | 52 |
Check for high-voltage lines running parallel to the PQ communication shielding. Separate them by at least 300mm. midea vrf v4 plus service manual
The V4 Plus system allows modules to be combined to scale up capacity. System configuration requires specific address settings on the outdoor unit main PCB using rotary switches (ENC1). Base Module Capacity (HP) Maximum Combined Modules Total System Capacity Range (HP) Maximum Connected Indoor Units 8 HP – 22 HP Up to 4 Units 8 HP – 88 HP Up to 64 Indoor Units 2. Pre-Commissioning and Installation Standards
The Midea VRF V4 Plus system operates on R410A refrigerant and features advanced DC inverter compressor technology. Understanding the physical layout and baseline specifications is the first step in successful troubleshooting. Key Specifications R410A Compressor Technology: All-DC Inverter
Have a specific V4 Plus issue not covered? Leave a comment below or contact Midea technical support at 1-888-XXX-XXXX (Option 3 for VRF).
E4: Ambient Temperature Sensor (T4) or Pipe Temperature Sensor (T3) Fault Check tightness of all electrical terminations on the
Unplug sensor and measure resistance. Compare against the Midea 10kΩ/50kΩ temperature-resistance curve chart. Replace sensor. Voltage protection fault Supply voltage too high (>440V) or too low (
Ensure the system is dehydrated by pulling a vacuum below 500 microns.
Undercharged refrigerant; blocked filter drier; indoor indoor air filters blocked.
Critical points from the service manual include: It is critical to confirm all water pipelines
Place the Red meter probe on the Negative DC bus terminal ( N ) and the Black probe sequentially on U , V , and W . Expect the same reading.
The V4 Plus series supports wide-ranging building requirements through modular outdoor unit combinations. Outdoor Capacity: Modules range from 8 HP to 16 HP (25.2 kW to 90 kW), with combinations reaching up to Indoor Connectivity: 64 indoor units
Verify three-phase voltage balance. Voltage imbalance between phases must not exceed 2%. Refrigerant System Integrity
