Children's Health | HVAC System Troubleshooting 201

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Question 1 of 8

1. Question
What would be the most likely cause of an air handling unit (AHU) tripping off on high static pressure?
- damper or downstream static pressure sensor failure
- chilled water valve position (likely closed)
- faulty variable frequency drive (VFD)
- faulty return fan motor
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Question 2 of 8

2. Question
A soiled utility room indicating positive pressure to the corridor could indicate what type of equipment failure?
- failed exhaust fan
- failed heating water reheat valve
- failed heating water mixing valve
- failed cooling tower fan
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Question 3 of 8

3. Question
How is static pressure measured?
- Inches water column
- Watts
- Btu’s
- Therms
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Question 4 of 8

4. Question
A dirty evaporator coil could lead to what?
- Increased static pressure
- Increased temperature
- Increased pneumatic air pressure
- Incorrect humidity
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Question 5 of 8

5. Question
What is usually a sign of a worn-out belt?
- Increase in noise in the fan
- Additional condensation in the drain pan
- Increased supply temperatures
- Increased pressure across filters
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Question 6 of 8

6. Question
A surgeon frequently complains that OR 17 is much warmer than any of the other rooms. Using the building automation system (BAS), which of the following procedures can be followed to prove or disprove the surgeon’s claim?
- Run an air temperature and relative humidity trend on OR 17; then, compare the trend data to other operating rooms for the same period of time.
- Verify the air handling unit (AHU) serving OR 17 is in operation, the outside air temperature is below 70 F, and the relative humidity is below 65%.
- Block OR 17 for a period of 2 days; then, monitor for spikes in room air temperature or relative humidity.
- Run an outside air temperature and relative humidity trend for a 7-day period; then compare the trend data to weather.com (or similar) to ensure sensors are correctly calibrated.
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Question 7 of 8

7. Question
The alarm code, “Remote Stop”, occurs on a supply fan variable frequency drive (VFD). Which of the following steps should be the first course of action in this scenario?
- Check the associated air handling unit (AHU) and building automation system (BAS) for alarm conditions such as freeze-stat.
- Place the variable frequency drive (VFD) in “bypass” (or manual mode) so the unit will operate.
- Turn off the variable frequency drive (VFD) at the disconnect to reset it.
- Manually open all associated dampers to maximize system airflow.
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Question 8 of 8

8. Question
When reviewing the building automation system, a patient room is displaying a supply airflow of 850 cubic feet per minute (CFM). Further inspection indicates no airflow is actually entering the space. Which of the following steps should be the first course of action in this scenario?
- Check the flowcross, caps, tubing, differential pressure (DP) transducer, and linkages to the actuator on the variable air volume (VAV) box to ensure correct operation.
- Increase the maximum cooling airflow setpoint because it’s set too low.
- Increase the air handling unit supply air temperature serving the air terminal unit and monitor for changes.
- Implement a weekly schedule to reduce the cooling setpoint (night setback) during the evenings and on weekends.
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Children’s Health | HVAC System Troubleshooting 201

Children’s Health | HVAC System Troubleshooting 201

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