Children's Health | Plumbing System Troubleshooting 201

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Question 1 of 8

1. Question
What is the acceptable temperature range for domestic hot water at all sinks and showers?
- 100˚F-116˚F
- 90˚F-100˚F
- 110˚F-120˚F
- 121˚F-140˚F
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Question 2 of 8

2. Question
Which of the following utilities or systems is a typical application for a hot water mixing valve?
- domestic hot water
- hot water reheat
- chiller condenser water
- dishwashing machine final rinse cycle
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Question 3 of 8

3. Question
What is the most likely root cause if domestic hot water temperatures drop below 90˚F on a single floor?
- The mop sinks in the EVS closets likely have both the hot and cold water turned on (mixing valve).
- The building heating water generator has malfunctioned.
- The boiler serving that area is operating with low pressure.
- A steam trap within the steam system has failed open.
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Question 4 of 8

4. Question
What valve type is a pressure relief valve combined with and controlled by a self-actuated auxiliary pressure relief valve?
- pilot operated relief valve
- balanced relief valve
- pressure relief valve
- emergency relief valve
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Question 5 of 8

5. Question
Which of the following is not a possible cause of water hammer in a domestic water system?
- a non-functioning backflow preventer
- a fast acting solenoid valve
- malfunctioning ball or float valves
- air arrestor (chamber) not installed
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Question 6 of 8

6. Question
What would cause hot water to enter a toilet when it’s flushed?
- The check stop on the shower mixing valve has failed and needs to be rebuilt.
- The domestic hot water line was piped incorrectly.
- The diaphragm has failed.
- The temperature in the hot water heater is set too high.
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Question 7 of 8

7. Question
No hot water is reaching OR 5. Which of the following procedures should be followed as the first course of action in this scenario?
- Starting at the mechanical room serving the OR, verify the water heater is operating correctly and ensure adequate steam or voltage for system operation. Finally, check for safety switch issues and operation.
- Shut down the OR to prevent cases from being performed. Ensure the valves serving the OR are open and determine if hot water is reaching areas adjacent to the OR. Finally, verify the water heater is operating correctly.
- Notify the head of the surgical department. Then, inspect the thermocouples and heating element on the water heater. Finally, check the associated electrical breaker.
- Determine if service work was recently performed in this area. Then, inspect the building automation system (BAS) sensors to determine if the failure is technology based. If not, then use a thermal imaging camera to confirm the exiting pipe from the water heater is reaching minimum temperature requirements. Then, ensure adequate steam or voltage for system operation. Finally, check for safety switch issues and operation.
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Question 8 of 8

8. Question
What is a common cause of a failure with a backflow preventer?
- Backflow preventer is fouled from buildup
- Backflow preventer installed too close to the steam trap
- Backflow preventer is undersized for the pipe
- Backflow preventer installed too close to the wye strainer
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Children’s Health | Plumbing System Troubleshooting 201

Children’s Health | Plumbing System Troubleshooting 201

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