Although it is no longer used in the manufacturing of new air conditioning systems, the number of existing systems using __________ is large, so technicians will be encountering this refrigerant for many years to come.
A. R-22
B. R-12
C. R-410A
D. R-134a
Answer: A
You might also like to view...
Which of the following load factors typically has more effect on the cooling load, unless there are serious deficiencies with the others?
a. Shaded glass b. Infiltration c. Wood and metal doors d. Duct gain/loss
System instrumentation is found on the _____.
a. site plan b. plan views c. P&ID d. isometrics
____ default practice allows aligned decimal millimeter dimensions. Both standards are used throughout North America.
A. IEC B. ANSI C. ISO D. IETF
The term "listed" means that ____.
A. equipment, materials, or services meet appropriate designated standards or have been tested and found suitable for a specified purpose B. equipment or material must continue to comply with the appropriate standards (or performance) under which the labeling was granted C. equipment or material complies with discretionary standards as listed in the NEC® D. equipment or material is listed for sale by general or subcontractors