Overview
VRF systems vary refrigerant flow to each room’s load, giving good part-load efficiency and individual zone control. Heat-recovery models can cool and heat different zones at the same time.
Design must check pipe lengths, level differences, refrigerant concentration in small rooms per safety standards, and well-ventilated outdoor unit positions. The system suits fast-track projects and phased expansion.
Uses
- 01Offices and factory admin buildings
- 02Hotels and serviced apartments
- 03Showrooms and training centres
- 04Retrofits of existing buildings
Selection and acceptance checks
- Check pipe lengths and level differences against maker limits
- Leak test, vacuum and charge the correct refrigerant mass
- Check refrigerant concentration in small rooms
Reference standards
- AHRI 1230
- ISO 15042
- ASHRAE 15
For reference only. The standards for each project follow its design documents, current Vietnamese codes and the investor’s requirements.
Reference brands
- Daikin DaikinJapanese air-conditioning group: VRV, chillers, AHUs and residential units.
- Carrier CarrierUS group in air-conditioning, chillers, AHUs and refrigeration.
Brands are listed for reference; World Steel selects suppliers according to each project’s specification.
Sectors and solutions
Sectors
Commercial buildings High-rise buildings FDI factories
World Steel services
MEP general contracting Warranty and maintenance EPC contracting
