ICC Commercial Mechanical Practice Exam

What is the function of an approved temperature actuated mixing valve in a water-heating system?

1. To control the flow rate

2. To temper the water supplied to the potable hot water distribution system

3. To increase water pressure

4. To reduce energy consumption

The correct answer is: To temper the water supplied to the potable hot water distribution system

An approved temperature actuated mixing valve plays a crucial role in a water-heating system by tempering the water supplied to the potable hot water distribution system. This means that it regulates and mixes hot water from a water heater with cooler water to achieve a desired temperature that is safe and comfortable for usage, such as for showers, sinks, or other fixtures. By ensuring that the water temperature does not exceed a certain limit, the valve helps prevent scalding risks, making it especially important in residential and commercial settings where safety is a priority. Additionally, it contributes to the overall efficiency of the system by maintaining consistent water temperatures, which can also have implications for energy usage. While adjusting flow rates, increasing water pressure, or reducing energy consumption are important aspects of water heating systems, the specific function of the approved temperature actuated mixing valve is primarily focused on temperature control to provide safe, tempered water for distribution.