One of the most common service calls for VRF systems is insufficient cooling or heating due to incorrect charge.
The Midea VRF (Variable Refrigerant Flow) V4 Plus series represents a high-efficiency, intelligent commercial air conditioning system. This service manual provides comprehensive technical data for installation, operation, maintenance, and troubleshooting of the V4 Plus range, including heat pump (YCOE) and heat recovery (YAPE) models. midea vrf v4 plus service manual
Document Purpose: To serve as a technical reference for fault diagnosis, component testing, refrigerant management, and electronic control logic. One of the most common service calls for
The V4 Plus uses a proprietary calculation for additional refrigerant. The manual provides this formula: Service Manual Warning: Do not use sight glass
Additional Charge (kg) = (Liquid pipe length total – Standard length) × 0.022 + Σ (Indoor unit correction factor)
Service Manual Warning: Do not use sight glass to judge charge. The V4 Plus operates with subcooling between 8-12°C (14-22°F) at nominal conditions. Use the built-in service port pressure sensors (read via the wired controller's monitoring mode).