What is the purpose of a plenum thermostat?
A) To control the zone dampers based on the plenum temperature
B) To control the heating and cooling equipment to maintain the desired temperature in the supply plenum at all times
C) To cycle off the heating or cooling equipment if the air gets too hot or cold in the plenum when only one or two zones are calling
D) To control the plenum heat strips that prevent the supply air temperature from dropping too low
[Ques. 2] The firing rate of a furnace with a 0.75 gph nozzle is:
A) 150,000 BTU per hour. B) 7,500 BTU per hour.
C) 75,000 BTU per hour. D) 105,000 BTU per hour.
[Ques. 3] What national standards organization publishes standard 31, a reference for installing oil furnaces?
A) NIST, National Institute of Standards and Technology
B) NFPA, National Fire Protection Association
C) NOFA, National Oil Furnace Manufacturers Association
D) NICE, National Institute of Clean Energy
[Ques. 4] Which of the following statements pertains to wiring procedures for split systems?
A) You connect wires of the same colors to wire split-system heat pumps.
B) You connect the two green wires to energize the fan.
C) Wires of an indoor blower and outdoor condensing unit share a power circuit.
D) Split systems require two power circuits and two wire bundles.
[Ques. 5] What is the purpose of the bypass damper used in many zone systems?
A) To bypass low- and high-temperature limits on the equipment when only one zone is calling
B) To allow outdoor air to bypass the equipment during free cooling
C) To recirculate air that is not being used by the active zones
D) To allow outdoor air to bypass the equipment during zone ventilation mode
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