Once a technician works on a system, what else should he or she do?
A) Check for gas leaks. B) Increase household ventilation.
C) Do nothing else. D) Open the gas flow valve.
[Ques. 2] What should be drained, cleaned, and flushed on a regular basis?
A) The compressor and blower B) The sump and all water lines
C) The cooling tower basin D) The evaporative condenser
[Ques. 3] Why do most humidifiers require annual cleaning and media replacement?
A) A chemical reaction between the media and the water causes a crusty white buildup.
B) The media is slowly dissolved by the water used in the humidifier.
C) Minerals in the water are left behind in the sump and media.
D) The water attracts dirt from the air.
[Ques. 4] Soot forming in the heat exchanger can be caused by:
A) The presence of coal tar in the gas. B) Too much gas in the gasair mixture.
C) Excessively high combustion temperatures. D) Too much air in the gasair mixture.
[Ques. 5] Which type of humidifier requires the least cleaning?
A) Bypass evaporative humidifiers, which do not hold water in a sump
B) Plate-type humidifiers
C) Motorized atomizing humidifiers
D) Wetted-element humidifiers that have a water sump
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