What is the major advantage of smoke detectors vs. thermal detectors?
A) Smoke detectors can be calibrated in situ.
B) Smoke detectors are quicker to respond.
C) Smoke detectors are less prone to dirt accumulation and easier to maintain.
B) Smoke detectors are quicker to respond.
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During inspection, the valve body mounting surface of the case is found to be slightly warped. Technician A says the problem may be corrected by using a fine file on the valve body. Technician B says the case must be replaced if the mounting surface for the valve body is warped. Who is correct?
A. A only C. Both A and B B. B only D. Neither A nor B
The purpose of the defrost cycle in a heat pump is to _____.
a. warm the unit circuits for optimum electrical operation b. prevent ice buildup on the indoor coil c. prevent ice buildup on the outdoor coil d. remove frost buildup throughout the system ductwork
All circuit breakers must be designed so that any fault must be cleared before the circuit breaker can be ____________________.
Fill in the blank(s) with the appropriate word(s).
The power wire for the condensing unit is sized:
A) By the minimum circuit ampacity (MCA) shown on the name plate. B) By the maximum overcurrent protection (MOP) shown on the nameplate. C) The same wire gauge as the wires inside the unit. D) At 115% of the minimum circuit ampacity shown on the nameplate.