Question
Which would constitute the last step in a central-fan cooling control sequence? A) The blower continues to operate until the temperature within the fan unit rises above the setpoint of the internal controller, at which time the blower shuts off. B) Cool air from the fan system is delivered through ductwork to occupied spaces within the home. When the space temperature within the fan unit drops below the room temperature setpoint, the refrigeration unit shuts down. C) During the cooling season, when the home's air temperature rises above a predefined setpoint, the room thermostat calls for cooling and energizes the refrigeration control circuit. D) When the air temperature within the fan unit drops below the setpoint of an internal controller, the blower motor is energized.
Ask by Bolton Bernard. in the United States
Jan 29,2025
Real Tutor Solution
Tutor-Verified Answer
Answer
The last step in the central-fan cooling control sequence is when the blower stops operating once the temperature in the fan unit exceeds the setpoint, completing the cooling cycle.
Solution
The correct answer is:
**A) The blower continues to operate until the temperature within the fan unit rises above the setpoint of the internal controller, at which time the blower shuts off.**
**Explanation:**
In a central-fan cooling control sequence, the typical steps are as follows:
1. **Thermostat Activation:** When the home's air temperature rises above the predefined setpoint, the thermostat calls for cooling and energizes the refrigeration control circuit (related to option C).
2. **Refrigeration System Activation:** This initiates the refrigeration process to cool the air.
3. **Blower Operation:** The blower motor is energized to circulate the cooled air through the ductwork to occupied spaces (related to option D).
4. **Monitoring and Shutoff:** The blower continues to operate, maintaining the desired temperature. The final step occurs when the temperature within the fan unit rises above the internal setpoint, signaling that sufficient cooling has been achieved. At this point, the blower shuts off to complete the cooling cycle (option A).
Option A represents the termination of the cooling sequence, making it the last step in the process.
**Answer:**
A) The blower continues to operate until the temperature within the fan unit rises above the setpoint of the internal controller, at which time the blower shuts off.
Reviewed and approved by the UpStudy tutoring team
Like
error msg
Explain 
Simplify this solution Extra Insights
The last step in a central-fan cooling control sequence involves ensuring that the fan effectively maintains optimal conditions. Once the air temperature within the fan unit reaches a certain level, a responsible system will cease operations when it deems that conditions have returned to normal, allowing for energy savings and maintaining comfort throughout the space. To visualize this process, think of it as the cooling system playing a strategic game of tag. It actively responds to changes in temperature, tagging on or off as necessary. This ‘game’ continues until the environment feels just right, ensuring energy isn't wasted and comfort levels are maximized in your home.
