Referring to the illustrated dual duct...

Question 1 / 2066636eee28f7522a1c51f0df

Question 1 of 2066636eee28f7522a1c51f0df

Referring to the illustrated dual duct multiple zone HVAC system, how is the space temperature directly controlled? Illustration RA-0043

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Question 1 of 20

66636eee28f7522a1c51f0df

Referring to the illustrated dual duct multiple zone HVAC system, how is the space temperature directly controlled? Illustration RA-0043

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🔍 Key Concepts

• Identify which control loop uses the room thermostat (space thermostat) versus a duct thermostat in the diagram. • Understand that in a dual-duct multiple zone system, the hot and cold air ducts are usually conditioned to fairly constant temperatures, and individual rooms are adjusted locally. • Trace what each coil (preheater, cooling coil, reheater) is controlling: duct temperature or room/zone temperature.

💭 Think About

• Follow the line from the room thermostat symbol in the space back to the equipment: what component or device does it actually move or signal? • Ask yourself which elements (preheat coil, cooling coil, reheat coil, or mixing dampers) would normally serve the entire system, and which element is typically adjusted for each individual room or zone. • Look closely at the hot and cold duct paths at the mixing box: how does the diagram show the hot and cold air being combined before entering the room?

✅ Before You Answer

• Verify which device is labeled as the room thermostat (T) in the legend and where it connects in the schematic. • Confirm whether the steam valves for the preheat and reheat coils and the chilled‑water valve are controlled by duct thermostats or by the room thermostat. • Make sure you can see how the dual-duct mixing unit (M) operates and what signal it receives to adjust either airflow proportion or coil flow.

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Question 1 of 20

Referring to the illustrated dual duct multiple zone HVAC system, how is the space temperature directly controlled? Illustration RA-0043

The space air temperature is controlled by automatically controlling the steam flow through the reheat coil.

The space air temperature is controlled by automatically controlling the chilled water flow through the cooling coil.

The space air temperature is controlled by automatically proportioning the cold and hot air streams at the mixing unit.

The space air temperature is controlled by automatically controlling the steam flow through the preheat coil.

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Question 1 / 2066636eee28f7522a1c51f0df

Question 1 of 2066636eee28f7522a1c51f0df

Referring to the illustrated dual duct multiple zone HVAC system, how is the space temperature directly controlled? Illustration RA-0043

Back

Question 1 of 20

66636eee28f7522a1c51f0df

Referring to the illustrated dual duct multiple zone HVAC system, how is the space temperature directly controlled? Illustration RA-0043

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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