Children's Health | HVAC System Troubleshooting 101

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Question 1 of 8

1. Question
What is the purpose of a freeze stat installed on an air handling unit (AHU)?
- to prevent the unit coils from freezing
- to monitor chilled water temperature
- to provide a backup to the high static pressure sensor if it fails
- to monitor supply air temperature
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Question 2 of 8

2. Question
A damper fails open on an patient room variable air volume (VAV) terminal unit. Which of the following areas or equipment are affected in this scenario?
- the patient room
- a downstream soiled utility room losing negative air pressure
- the air handling unit, supplying air to the patient tower, which requires a shutdown for inspection and repair
- the hot water reheat heat exchanger, which has likely failed
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Question 3 of 8

3. Question
During routine rounds, a soiled utility room is found to have a positive air pressure relationship to the adjacent corridor. Which of the following steps should be the first course of action in this scenario?
- Check for proper exhaust fan operation (power, belts, etc.)
- Check the building automation system (BAS) for possible controls errors
- Install a portable HEPA fan
- Adjust supply air damper to reduce incoming air to the soiled utility room
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Question 4 of 8

4. Question
A patient room thermostat displays a temperature of 65 deg. F, but the room feels hot. Which of the following steps should be the first course of action in this scenario?
- Check the thermostat for proper operation and calibrate or replace it as needed
- Decrease the air handling unit supply air temperature.
- Decrease the chilled water supply temperature.
- Override the airflow setpoint to satisfy the temperature requirement
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Question 5 of 8

5. Question
If the hot/cold call is in an older part of the building, what may be the cause?
- Pneumatic valves
- Patients are hot after surgery
- Likely a facility-wide issue
- Surgeon’s are requesting to change the temperature for a surgery case
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Question 6 of 8

6. Question
When responding to a hot/cold call, what should you do next if checking the thermostat did not resolve the issue?
- Measure the temperature from the diffuser.
- Review the Building Automation System (BAS)
- Call in a HVAC contractor
- Ensure the hot or cold water valves are responding
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Question 7 of 8

7. Question
What does an “unreliable” alarm status in the building automation system (BAS) indicate?
- Loss of communication
- The alarm is offline
- The alarm is out of range
- A VAV terminal unit needs to be reset
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Question 8 of 8

8. Question
If you were needing to the correct number of air changes for a clean utility room, what would you reference?
- American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Standard 170, Table 7.1
- National Fire Protection Association (NFPA) 99
- National Fire Protection Association (NFPA) 101
- The Joint Commission Standards
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Children’s Health | HVAC System Troubleshooting 101

Children’s Health | HVAC System Troubleshooting 101

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