Quanzhou Ausenist Technology Co., Ltd Cooling Water Pump VFD for HVAC Systems
A cooling water pump VFD helps HVAC systems adjust pump speed according to cooling demand. It can reduce energy use, lower mechanical stress and support stable differential pressure or flow control.
Recommended Configuration
| Item | Reference Selection |
|---|---|
| Pump | Cooling water or chilled water pump |
| Motor | Three-phase induction motor |
| Control | Differential pressure, flow or BMS command |
| Signal | 4-20mA, 0-10V or communication |
| Protection | Overload, dry-run and fault relay output |
| VFD | AUSENIST pump VFD selected by current |
What Must Be Confirmed?
- Motor nameplate current and voltage.
- HVAC control signal type.
- Differential pressure or flow setpoint.
- Required BMS feedback and fault signal.
- Cabinet temperature and ventilation.
Selection Logic
For HVAC pumps, control mode depends on the building system. Some sites use local PID, while others send speed commands from the BMS. The VFD should be selected by current and configured with proper acceleration, minimum speed and fault output.
Common Mistakes
- Mixing up BMS command and feedback signals.
- Setting minimum speed too low for stable circulation.
- Ignoring cabinet heat in mechanical rooms.
- Leaving PID and BMS control active at the same time.
AUSENIST Solution
AUSENIST drives can support analog command, PID control and fault relay output for HVAC pump panels. Communication requirements should be confirmed before order.
FAQ
Can the BMS control pump speed?
Yes, if the VFD is configured for the correct analog or communication command.
Is differential pressure control common?
Yes. It is widely used in chilled water and cooling water circulation.
Does the VFD need a bypass?
Some projects require bypass control for maintenance or emergency operation.
Related AUSENIST Pages
Send AUSENIST the motor nameplate and HVAC control signal. We can suggest the correct VFD configuration.