Objective 4. AIR-CONDITIONING SYSTEM SYMBOLS. Identify common symbols for air-conditioning
system components and interpret the meaning of these symbols as used on plans to indicate air-
conditioning. (Answer questions 11 through 13.)
11. Figure 4-14 shows a plan view of an air-conditioning system. Note that the sizes of the various ducts are given
on the plan. What size duct connects the sick call room diffuser with the medical office diffuser? (para 4-5)
(fig 4-14)
12. Referring again to figure 4-14, at what pressure, in pounds per square inch, is the steam in the heating coils of
the air-conditioning units to be maintained? (para 4-6) (fig 4-14)
13. Note that the legend of figure 4-14 explains the meaning of certain lettered symbols. With the aid of this
legend, how many mercury type cooling thermostats are indicated on the air-conditioning plan? (para 4-6) (fig
4-14)
Objective 5. REFRIGERATION ELEMENTS SYMBOLS. Identify symbols used for elements of
refrigerated structures and interpret the representation of refrigeration systems on drawings. (Answer
questions 14 and 15.)
14. According to figure 4-17, what will be the capacity of each compressor, in British thermal units per hour, if a
100-foot building is constructed? (para 4-10) (fig 4-17)
15. Referring again to figure 4-17, if a 52-foot warehouse were to be constructed, how many unit coolers would be
required? (para 4-10) (fig 4-17)
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