Skip to content
Book a Demo
Personas
Field Engineer
Categories
Breakdowns & Complaints

Equipment diagnostics and inferencing

Building systems are complicated and you don’t have time to look into every problem. Robin can help. Ask it a question about how your system is performing and it can analyze the existing data in the BMS and give you a best guess on the cause and help you with diagnosis.

Why is my fan speed running at 100%?
See what sample results look like

I can see that you’re looking at the AHU (Air Handling Unit) system in the Niagara building management interface. Based on the data I can see on the screen, I can help analyze why your fan is running at 100%.

Looking at the current readings, I can see several key parameters:

Fan Speed Information:

  • Speed: 100.0% – Your supply fan is indeed running at maximum capacity
  • Status: On – The fan is currently active

System Conditions that might explain the 100% fan speed:

  1. Temperature Control Issues:
    • Supply Air Temp: 53.3°F (Set Point: 55.0°F)
    • Mixed Air Temp: 54.5°F (Set Point: 55.0°F)
    • Return Air Temp: 53.3°F
  2. Static Pressure:
    • Current Static Press: 1.28 in/wc (Set Point: 1.75 in/wc)
    • The system is running below the static pressure setpoint, which could indicate high demand
  3. Air Quality Factors:
    • Economizer: 4.2% (very low, meaning mostly recirculated air)
    • The system may be working hard to maintain air quality

Most likely reasons your fan is at 100%:

  1. High Cooling/Heating Demand: The system is trying to reach temperature setpoints
  2. Static Pressure Control: The fan may be compensating for high resistance in the ductwork or filter restrictions
  3. Economizer Mode: With only 4.2% economizer, the system is relying heavily on mechanical cooling/heating
  4. System Configuration: The fan may be in a manual override mode or responding to a high-priority control sequence

Recommendations to investigate:

  • Check if there are any active alarms or overrides
  • Verify filter conditions (dirty filters increase static pressure demand)
  • Review the control sequence to see if it’s in an override mode
  • Check for any damper positioning issues that might be causing high static pressure

Would you like me to help you navigate to other parts of the system to get more diagnostic information, such as checking for alarms or looking at the detailed control parameters?