Which of the following is true concerning...

Question 1 / 2066636eee28f7522a1c51ea66

Question 1 of 2066636eee28f7522a1c51ea66

Which of the following is true concerning the class "D" air conditioning system shown in the following illustration? Illustration RA-0042

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Question 1 of 20

66636eee28f7522a1c51ea66

Which of the following is true concerning the class "D" air conditioning system shown in the following illustration? Illustration RA-0042

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🔍 Key Concepts

• Class "D" reheat-type central air conditioning system – how temperature is controlled in the main duct versus in each room • Role of the duct thermostat compared to the room thermostat in the schematic (what each one actually modulates) • Difference between chilled‑water (indirect) cooling coils and direct-expansion (DX, vapor compression) air conditioning units

💭 Think About

• From the illustration, trace what the duct thermostat is connected to. Does its control signal go to the chilled‑water cooling coil valve, the reheater, or something else? • Look at the room thermostat symbol by the reheater coil. What device does it operate, and does that change the room’s dry‑bulb temperature, wet‑bulb temperature, or something different? • Consider what happens to cooling load if you use more recirculated air and less outside air. Does that usually increase or decrease the amount of heat the system must remove?

✅ Before You Answer

• Verify in the legend which symbol is the duct thermostat and follow its control line to see what it modulates (especially around the cooling coil – chilled water). • Verify what fluid is going through the main cooling coil in the diagram (look for the label chilled water) and compare that to a direct-expansion vapor compression system. • Confirm that the room thermostat is located at (and directly controls) the reheater (hot water) valve for each space, and think about whether that would control dry‑bulb or wet‑bulb temperature.

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Question 1 of 20

Which of the following is true concerning the class "D" air conditioning system shown in the following illustration? Illustration RA-0042

The duct thermostat determines the amount of water flow circulating through the cooling coil.

The room thermostat controls the wet bulb temperature of the air conditioned space.

The heat load will increase by increasing the amount of recirculated air.

System cooling is the direct result of the vapor compression refrigerant circuit of a direct type air conditioning unit.

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Question 1 / 2066636eee28f7522a1c51ea66

Question 1 of 2066636eee28f7522a1c51ea66

Which of the following is true concerning the class "D" air conditioning system shown in the following illustration? Illustration RA-0042

Back

Question 1 of 20

66636eee28f7522a1c51ea66

Which of the following is true concerning the class "D" air conditioning system shown in the following illustration? Illustration RA-0042

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

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