Children's Health | HVAC System Troubleshooting 301

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Question 1 of 8

1. Question
Which of the following standards is the industry authority for basic HVAC system requirements?
- American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Standard 170
- American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Standard 188
- National Fire Protection Association (NFPA) 101
- National Fire Protection Association (NFPA) 99
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Question 2 of 8

2. Question
When reviewing the building automation system, a patient room variable air volume (VAV) box indicates the heating water reheat valve is open. Which of the following results can be expected from this scenario?
- increased supply air temperature
- increased supply airflow
- hot water leak, likely into the patient room
- increased water temperature to the patient room shower and sink
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Question 3 of 8

3. Question
When reviewing the building automation system, an AHU is observed operating in economizer mode while the outside air temperature is 89˚F. Which of the following conditions is most likely the root cause?
- The economizer setpoint is incorrect.
- The chilled water valve is not completely open.
- The e-stop button is activated.
- The supply air setpoint is too high.
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Question 4 of 8

4. Question
Which of the following procedures should be initially followed if an AHU is not operating?
- (1) check the line voltage, (2) check the control voltage, (3) check the motor starter, (4) check the variable frequency drive (VFD) (if installed), and (5) check the safety switches
- (1) check for debris/standing water inside the unit, (2) inspect and service the equipment’s air filters, (3) clean the coils, (4) check the UV light (if installed), and (5) verify proper damper operation
- (1) lock out and tag out the unit and (2) create a work order for full service inspection by manufacturer or third party service provider
- (1) inform the appropriate departments (2) check the associated breaker, (3) check the line voltage (4) lock out and tag out the unit, and (5) create a work order for full service inspection by manufacturer or third party service provider
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Question 5 of 8

5. Question
An air-locked hot water finned-tube would likely cause what issue?
- Inefficient cooling
- Increased condensation
- Dirty coils
- Tripped compressor
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Question 6 of 8

6. Question
Which of the following control variables for quiet operation is steam-supply pipe sizing based on?
- 4,000-6,000-fpm
- Smallest practical pipe size such that the total system loss equals the boiler outlet pressure
- 4 feet/100 feet slope
- 3 FPS
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Question 7 of 8

7. Question
1 lb of water pressure equals how many feet?
- 2.31 feet
- 2 feet
- 3.21 feet
- 3 feet
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Question 8 of 8

8. Question
A condensing boiler with at least a 95% efficiency rating is sized for 100% design load and is not meeting the documented efficiency when operating at full capacity. The boiler is capable of meeting the heating water supply temperature setpoint of 165˚F with 155˚F entering water temperature. Which of the following statements is the primary cause of decreased efficiency?
- The entering water temperature is too high.
- The entering water flow is too low.
- The system differential pressure is too low.
- The system temperature difference is too high.
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Children’s Health | HVAC System Troubleshooting 301

Children’s Health | HVAC System Troubleshooting 301

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