Midea Vrf V4 Plus Service - Manual !new!

Introduction

The wiring diagrams section provides detailed electrical wiring diagrams for the V4 Plus system, including: midea vrf v4 plus service manual

A. Compressor Forced Operation

1. Turn off power to outdoor unit.
2. Set SW01-1 to ON and SW04 (Emergency DIP) to Position 3.
3. Restore power. Compressor will run at 40% fixed capacity.
4. Use case: Faulty ambient temperature sensor preventing normal startup.

4. Refrigerant Circuit & Key Components

4.1 Cooling Cycle

Compressor → 4-way valve (off) → Outdoor coil (condenser) → EEV (outdoor) → Liquid side → Indoor EEV → Indoor coil (evaporator) → Accumulator → Compressor Turn off power to outdoor unit

Introduction to Midea VRF V4 Plus

Maintenance Procedures

6.2 Refrigerant Charge

• Pre-charge for base unit + additional per meter liquid pipe (varies by pipe diameter).
• Formula example: Additional charge (kg) = (Liquid pipe length × factor) + (Indoor unit count × 0.5) - (precharge).
• Use Midea’s “Auto-charge” function via debugger.