PID Tuning for Discharge Air Temperature Control
Discharge air temperature loops respond faster than space temperature loops but still exhibit significant thermal lag. Tuning must balance responsiveness with downstream stability.
Common Issues
- Overshoot during load changes
- Interaction with space temperature loops
- Short cycling of heating or cooling
Recommended Tuning Strategy
- Moderate proportional response
- Integral action slower than expected
- Verify output limits and sequencing
Discharge air loops should support stable space control rather than fight it.