What is the purpose of the low ambient control on a commercial air conditioner?
A) To cycle the air conditioning system based on ambient temperature
B) To energize heat strips to control the ambient temperature
C) To prevent the system from operating at low ambient temperatures
D) To permit the unit to cool even at low ambient temperatures
[Ques. 2] The refrigerant condensing temperature for an air-cooled system having a 20F split is:
A) RCT = 95F - (20F/2 ) = 85F. B) RCT = 95F + (20F/2 ) = 105F.
C) RCT = 95F + 20F = 115F. D) RCT = 95F - 20F = 75F.
[Ques. 3] Induced-draft, forced-draft, counterflow, and crossflow cooling towers are all examples of:
A) An atmospheric-draft cooling tower. B) A natural-flow cooling tower.
C) A hyperbolic cooling tower. D) A mechanical-draft cooling tower.
[Ques. 4] What is the main safety concern for any type of gas-fired room heater?
A) They are dangerous if used as a drying rack for wet clothing.
B) The space where they are installed must have sufficient infiltration to supply the necessary combustion air.
C) They will overheat if the ductwork is undersized.
D) The electrical wiring to the unit must be heavy gauge to accommodate a high current draw.
[Ques. 5] What is meant by the coil split?
A) The temperature difference between the coil operating temperature and the air passing over the coil
B) The dividing point in an evaporator between high-side pressure and low-side pressure
C) The part of an A-coil evaporator where the two halves are joined
D) An opening at the seam in the copper tubing
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