When pressurizing a system for leak testing, the only refrigerant that can be used as a trace gas is _____
A) HFC-410A
B) HFC-134a
C) HFC-407C
D) HCFC-22
Answer: D
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Indicate whether the statement is true or false
What information is necessary to determine a system balance point?
A) The manufacturer's installation instructions, which publish the equipment balance point B) The balance point is determined as part of the heat load study before the equipment is chosen. C) A heat load calculation and the system capacity at two operating conditions D) The balance point for all AHRI rated heat pumps is 35°F.
___________ causes a light wave to be bent
A. Electromagnetic coupling B. Reflection C. Refraction D. Radiation
Before changing accessories or performing maintenance on a power tool, make sure _____
a. it is turned off b. your hands are dry c. to have a clean work surface d. the power is disconnected