Technical Guide · 2025
Everything you need to know about Variable Refrigerant Flow systems: how they work, the three VRF types, how they compare to conventional splits, and which commercial and industrial projects in Chile benefit most.
A VRF system (Variable Refrigerant Flow) is a centralized HVAC solution that allows independent temperature control in multiple zones using a single outdoor unit connected to several indoor units through a refrigerant piping network.
Unlike conventional split systems — where each outdoor compressor handles only 1 to 4 indoor units — a VRF system can manage between 2 and 60 or more indoor units from a single outdoor unit, with each zone operating completely independently.
The key is the variable-speed inverter compressor: instead of running at full power in an on/off cycle, it adjusts its speed precisely to match real-time building demand — reducing energy consumption 30–50% compared to conventional systems.
Main components
Inverter compressor · 1 or 2 modules
The heart of the system: contains one or more inverter compressors that modulate their speed to match actual demand. A single outdoor unit can serve 2 to 60+ indoor units depending on system capacity. Capacities range from 4 to 50+ TR (tons of refrigeration).
Copper · Up to 165 m equivalent · Multi-floor capable
The refrigerant (R-410A, R-32, or R-454B depending on brand) circulates in copper pipes from the outdoor unit to each indoor unit. Modern systems allow equivalent pipe lengths of up to 165 meters and height differences of up to 50 meters between units — making them viable for multi-story buildings.
Cassette · Wall-mount · Ducted · Floor-to-ceiling
Each indoor unit operates independently: it can be cooling, heating, or off regardless of what other units in the system are doing. Available formats: 4-way cassette (suspended ceiling), wall-mount (split-style), ducted (for air distribution systems), and floor-to-ceiling. One outdoor unit can support mixed types of indoor units.
Touchscreen · BMS · Mobile app
A central controller manages all indoor units from a single point: time schedules, per-zone temperature, operating mode, and energy monitoring. Advanced systems integrate with BMS (Building Management Systems) via BACnet, Modbus, or LonWorks protocols.
Three available configurations
Warm climates · Year-round cooling
The simplest mode: the outdoor unit only cools. Indoor units in heating mode use an electric resistance element or have no heating function. Suitable for areas with warm climates year-round where heating is unnecessary or occasional. Upfront cost 10–15% lower than heat pump mode.
Cooling + heating with one system
The outdoor unit can operate in cooling or heating mode. All indoor units must run in the same mode simultaneously (all cooling or all heating). Ideal for climates with distinct seasons — Santiago, Concepción, or Coquimbo. Heating efficiency far superior to electric resistance elements.
Cooling and heating at the same time · Maximum efficiency
The most advanced configuration: some indoor units cool while others heat, simultaneously. Heat "rejected" by the cooling zones is "recovered" to heat other zones. This produces very high efficiencies (COP up to 6 in recovery mode). Ideal for hotels, hospitals, and offices with varied solar exposure by zone.
| Criterion | Conventional Splits | VRF Inverter |
|---|---|---|
| Independent zone control | No (all tied to one compressor) | Yes (each unit operates independently) |
| Energy efficiency | Medium (COP 2.5–3.5) | High (COP 3.5–5.0 at partial load) |
| Pipe length | 30–50 m | Up to 165 m equivalent |
| Number of indoor units | 1–4 per compressor | 2 to 60+ per outdoor unit |
| Upfront investment | Low | Medium-high |
| Maintenance | Simple, wide service network | Requires brand-certified technician |
COP 3.5–5.0
Efficiency at partial load
165 m
Maximum equivalent pipe length
60+
Indoor units per outdoor unit
30–50%
Energy savings vs conventional splits
Ideal projects
Most common application. Per-room zone control. High efficiency at partial load when many zones are idle during business hours.
Individual room control. Heat recovery mode for pool and spa areas. Low noise level NC-25 for quiet environments.
Zones with opposing demands (operating rooms, radiology, waiting areas). Heat recovery for maximum efficiency across mixed loads.
Stores with high customer density. VRF allows per-tenant control and individual energy sub-metering.
Offices + retail + food & beverage in the same building. A single VRF network covers all zones with differentiated control.
Free quote
Get a detailed budget for your VRF project.
FAQ
VRF stands for Variable Refrigerant Flow. VRV is exactly the same technology but is Daikin's registered trademark — the company that first developed and commercialized this technology in Japan in 1982. Other manufacturers (Mitsubishi Electric, LG, Samsung, Carrier) use the generic term VRF. Technically they are equivalent.
It depends on the outdoor unit's capacity. Small commercial systems (4–6 TR) support 2–8 indoor units. Mid-size commercial systems (10–20 TR) support 8–20 units. Large industrial systems (30–50 TR with multiple outdoor modules) can connect 60 or more indoor units. The constraint is not just unit count but also total installed indoor capacity, which should not exceed 130% of outdoor unit capacity.
Only heat recovery VRF systems can heat and cool simultaneously. Cooling-only and heat pump systems must run in one mode at a time (all cooling or all heating). Heat recovery VRF uses a 3-pipe connection instead of 2, adding upfront cost but allowing energy rejected by cooling zones to be reused for heating other zones.
The most common VRF refrigerants today are R-410A and R-32. R-32 (the more modern option) has a global warming potential (GWP) of 675 vs. 2,088 for R-410A — 68% lower. Both are safe for enclosed spaces at normal operating concentrations: non-toxic and non-flammable at normal levels. In the event of a leak, modern systems include refrigerant sensors with alarms and automatic emergency ventilation. EN 378 establishes maximum refrigerant charge limits per room volume.
If the outdoor unit fails, the entire system loses conditioning. For critical facilities (data centers, operating rooms, luxury hotels), N+1 redundancy with two outdoor units connected to the same piping ring is recommended. For standard offices, a single outdoor unit is the norm. Major brand spare parts availability in Chile (Daikin, Mitsubishi, LG) typically allows repairs.
An inverter VRF system consumes 30–50% less than equivalent fixed-speed conventional splits. Two reasons: the inverter compressor modulates speed to match actual demand (no constant on/off cycling), and partial-load operation (when only some zones are active) is far more efficient. For a 500 m² floor operating 8 hours/day in Santiago, annual savings can be CLP 1.5–3 million (≈ USD 1,600–3,200) vs. conventional splits.