A typical chilled water system is designed to operate with a leaving water temperature off the chiller coil of ____°F.
A. 35
B. 40
C. 45
D. 50
Answer: C
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What advantage is there to maintaining a negative pressure on the heat exchanger?
A) The negative pressure helps draw in return air from the house, increasing efficiency. B) Combustion air can only be drawn into the oil burner if a negative pressure is maintained. C) The vent will not work unless the heat exchanger is at a negative pressure. D) Safety; it ensures combustion products do not leak out into the air stream.
In most 24 V AC low-voltage systems the red wire is hot, the yellow wire is the cooling circuit, and the green wire controls the:
A) Compressor. B) Gas valve. C) Heater element. D) Fan circuit.
Flare nut wrenches are used to ____.
A. tighten or loosen nuts on copper tubing B. open or close refrigerant service valves C. tighten nuts that cannot be reached with other wrenches D. remove hex head screws from refrigerator cabinets