Referring to the illustrated diagram, what...

🔍 Key Concepts

• Look at whether the system sends out two separate air streams (hot and cold) from the main air handling unit or just one supply duct. • Check if there is a mixing box at the room/zone where hot and cold air are blended under control of a room thermostat. • Compare this with a terminal reheat layout, where air is generally cooled centrally and then reheated only at the terminal, versus systems where both hot and cold ducts run through the space.

💭 Think About

• Follow the airflow from the coils to the room: Do you see distinct hot and cold ducts leaving the central unit, or a single conditioned air stream? • At the space served, is the thermostat controlling a mixing device that blends two ducts, or only a reheat coil on a single duct? • Ask yourself which of the four listed system types is specifically known for using separate hot and cold trunks that are mixed at each zone.

✅ Before You Answer

• Verify in the legend what the symbol M (Dual Duct Air Mixing Unit) represents and where it is located in the diagram. • Confirm whether the diagram shows both a cooling coil and a separate reheater coil feeding different ducts that then run toward the rooms. • Before choosing, rule out options that would normally have only one main supply duct or only local reheat at the terminal rather than central hot and cold ducts.

Referring to the illustrated diagram, what type of HVAC system is shown? Illustration RA-0043

A terminal reheat system

A single zone system

A dual duct system

A variable air volume system

🔍 Key Concepts

💭 Think About

✅ Before You Answer