6. The symbols below show four piping symbols for hot water and steam. Which symbol represents a hot-water
heating return? (para 4-1,c) (fig 4-1)
7. The delivery portion of a warm-air heating system distributes air, heated by a furnace, through supply ducts to
various rooms where the air is discharged through registers or grills. Which of the symbols shown below
represents a supply register? (para 4-3,a) (fig 4-2)
8. When forming branch ducts leading from or to the main ducts, changing the direction of ducts, or reducing the
duct size, various types of connections are employed. Which of the connections shown below is a split tee?
(para 4-3,b) (fig 4-10)
Objective 3. AIR-CONDITIONING SYSTEM UNITS. Describe the units which make up an air-
conditioning system and how they function. (Answer questions 9 and 10.)
9. What are the components of the control subsystem in an air-conditioning system? (para 4-5)
10. What are the parts of the air path subsystem in an air-conditioning system? (para 4-5)
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