Which of the following is true concerning...

Question 1 / 2066636eee28f7522a1c51ea68

Question 1 of 2066636eee28f7522a1c51ea68

Which of the following is true concerning the class "A" air conditioning system shown in the illustration as used to condition the air of large public spaces? Illustration RA-0009

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Question 1 of 20

66636eee28f7522a1c51ea68

Which of the following is true concerning the class "A" air conditioning system shown in the illustration as used to condition the air of large public spaces? Illustration RA-0009

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🔍 Key Concepts

• Trace the steam lines and note which components (preheater, reheater) each thermostat symbol is connected to. • Identify how room temperature control is achieved: look at the room thermostat symbol and see which valve or coil it actually modulates. • Consider typical dehumidification operation: can you cool the air then reheat it? What does that imply about using the cooling coil and reheater together?

💭 Think About

• Which thermostat (room, duct, or outdoor) appears to send a signal to the reheater steam valve in the diagram? What does that suggest about how room dry-bulb temperature is controlled? • Follow the control line from the space thermostat: does it go to the preheater, or to another valve? How does that help you judge options B and D? • If the cooling coil is active and the air becomes too cold or too damp, how could the system still deliver comfortable air to the space? Would that require the reheater to be off, or possibly on at the same time as cooling?

✅ Before You Answer

• Verify which coil is labeled P (preheater) and which is R S (reheater), and match them to their control valves and thermostats. • Check if the reheater steam valve is normally open or normally closed, and what signal changes its position; relate that to whether it can operate during cooling. • Confirm whether any control line from the space thermostat goes to the preheater steam valve; if it does not, reconsider any choice that claims the space thermostat controls the preheater.

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Question 1 of 20

Which of the following is true concerning the class "A" air conditioning system shown in the illustration as used to condition the air of large public spaces? Illustration RA-0009

The reheater is not used when in the cooling mode.

The dry bulb room temperature is controlled by a steam heated reheater and its associated pneumatic control valve.

It is not possible for both the cooling coil and the steam heated reheater to be used simultaneously.

The preheater steam flow is controlled by the space thermostat.

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Question 1 / 2066636eee28f7522a1c51ea68

Question 1 of 2066636eee28f7522a1c51ea68

Which of the following is true concerning the class "A" air conditioning system shown in the illustration as used to condition the air of large public spaces? Illustration RA-0009

Back

Question 1 of 20

66636eee28f7522a1c51ea68

Which of the following is true concerning the class "A" air conditioning system shown in the illustration as used to condition the air of large public spaces? Illustration RA-0009

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

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

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