Field glossary

VFD

Variable-frequency drive on the pump, letting the CDU modulate flow to hold its control target and ramp on a pump loss

Used across 4 Anvilfield field guides, most in Datacenter.

Also defined as

Landscaping: Variable frequency drive, which varies pump speed to hold constant pressure and cut energy per the affinity laws
HVAC: Variable frequency drive, which changes motor speed electrically by changing the frequency

Where this shows up