Why should the temperature inside the compressor be kept under 300F?
A) Because the metal components inside the compressor will start to melt
B) Because the refrigerant starts to fractionate above 300F
C) Because the refrigerant starts to boil inside the compressor above 300F
D) Because the compressor oil starts to break down above 300F
[Ques. 2] Outside air is drawn into the building through:
A) A calibrated grille in the return air duct. B) An outside air damper.
C) A hole in the air handler cabinet. D) Naturally occurring cracks in the building.
[Ques. 3] The reversing valve reverses the direction of refrigerant flow:
A) And reverses the function of the two heat exchange coils.
B) By reversing the airflow through the two heat exchange coils.
C) By reversing the direction of the compressor motor.
D) By reversing the polarity of the electric power supplying the system.
[Ques. 4] Which of the following is TRUE of piping tables?
A) The table is only accurate for heating systems.
B) The length of piping helps to find cubic foot capacity.
C) The table uses pipe width to determine cubic foot capacity.
D) The cubic foot capacity can help to determine length.
[Ques. 5] In communicating systems, fault history, system run time, system status, and other helpful service information are normally:
A) Available at the LCD screens on the side of the equipment.
B) Always shown on the main thermostat display.
C) Available through the service screens of the communicating thermostat.
D) Available on the manufacturer's website for each installed system.
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