Danfoss VSDs for HVAC/R (Heating, Ventilation, Air Conditioning, Refrigeration). These are strong parts of Danfoss’s offering and they’re designed to make fan, pump, and compressor control as efficient, reliable, and HVAC-friendly as possible.
⚙️ Key Danfoss HVAC/R VSD: VLT® HVAC Drive FC 102
Main model:
➡️ VLT® HVAC Drive FC 102
This is Danfoss’s flagship VSD for HVAC and refrigeration — used worldwide in:
- Air handling units (supply/extract fans)
- Chilled water pumps
- Cooling towers
- Condenser fans
- Compressors (in some cases)
✅ What makes it HVAC/R specific?
Special features for HVAC/R:
| Feature | What it does |
| Fire Override Mode (Smoke Control) | Runs at full speed ignoring alarms to maintain smoke extraction during a fire. |
| Built-in PID Controllers | Can directly control fans/pumps without extra controllers. |
| Energy Optimization | Automatic energy optimization for fans/pumps → reduces losses. |
| Flow Compensation | Adjusts motor speed based on duct/static pressure drop. |
| Sleep Mode | Shuts off fan/pump when demand is low → big energy savings. |
| Built-in BMS communication | BACnet, Modbus RTU/TCP, LonWorks, PROFIBUS, PROFINET, EtherNet/IP — easy integration. |
| Integrated EMC filter | Meets strict EMC requirements for building installations. |
| Low Harmonics Options | AFE (Active Front End) versions or built-in DC chokes. |
❄️ Why is it used in refrigeration too?
For large HVAC/R chillers, heat pumps, or condenser fans:
- Speed control saves huge energy vs fixed-speed operation.
- Reduces compressor cycling.
- Matches cooling demand more closely.
- Helps avoid pressure spikes.
⚡ Power range
- From ~0.37 kW to >1 MW (depending on the variant).
- Single-phase for small fans/pumps.
- Three-phase 200–690 V for bigger systems.
🔌 Controls
- User-friendly keypad with clear menus.
- Remote PC software (VLT Motion Control Tool MCT 10) for setup, backup, trending.
- Many building management system (BMS) protocols built in → no need for external gateways.
🧰 Practical installation features
- Compact cabinet or wall mount.
- Robust cooling — derating curves for hot mechanical rooms.
- Pluggable I/O modules for additional sensors.
- Drive Bypass units available for critical applications.
- Compatible with shaft grounding for motor bearing protection.
⚠️ Typical practical tips
✅ Size your drive properly for HVAC duty — fans and pumps have variable torque loads → you may not need oversizing.
✅ Use motor bearing protection for large motors → to prevent VSD-induced bearing currents.
✅ Check harmonics — for big systems, check if you need AFE or filters to meet IEEE 519 or local grid codes.
✅ Parameter sets: The FC 102 has HVAC templates → setup is usually faster than a generic industrial drive.
📌 Popular applications in HVAC/R
| Application | Common setup |
| AHU supply/extract fan | FC 102 |
| Chilled water pump | FC 102 |
| Cooling tower fan | FC 102 |
| Condenser fan (large chillers) | FC 102 |
| Compressor (some scroll/screw units) | FC 102 or specialized OEM versions |
✅ Key benefits
- Proven track record in commercial buildings, hospitals, data centers.
- Very reliable and designed for 24/7 duty.
- Makes compliance with green building codes easier (ASHRAE, LEED, BREEAM).
- Good global support and spares availability.
