Why use a VFD in HVAC?
Variable speed control can match motor speed to system demand. Selection should consider motor current, fan or pump load profile, control signal, bypass requirements, harmonics and environmental conditions.
VFD Application Engineering
VFD for HVAC
VFD selection and control for HVAC fans, pumps and ventilation systems.
VFD Selection Considerations
Motor Data
Confirm motor kW or HP, rated current, rated voltage, frequency, RPM and motor type.
Load Requirement
Determine whether the application requires variable torque, constant torque, high starting torque or heavy-duty overload capacity.
Speed Range
Define minimum and maximum operating speed, acceleration time and deceleration requirements.
Control Method
Identify whether control is keypad based, analog, digital, PLC, Modbus, Ethernet or process-feedback based.
Environment
Consider ambient temperature, dust, moisture, altitude, enclosure rating and installation location.
Protection
Review overload, short circuit, phase loss, overvoltage, undervoltage, motor protection and emergency requirements.
Information Required for VFD Selection
✓ Motor kW / HP
✓ Motor rated current
✓ Supply voltage
✓ Motor RPM
✓ Machine or process type
✓ Required speed range
✓ Starting torque
✓ Acceleration time
✓ Braking requirement
✓ PLC / BMS integration
✓ Communication protocol
✓ Environmental conditions
APPLICATION SUPPORT
Need VFD selection support?
Share your motor data, machine type, load requirement and process details. Our technical team can help recommend the appropriate VFD.