Key safety aspects that should be checked during a planned maintenance service call for any combustion appliance include (you may select more than one):
A) CO levels in flue gas and around unit.
B) Combustion air.
C) The presence of CO2.
D) Vent system integrity.
E) Furnace cabinet temperature.
[Ques. 2] What is the primary way a convector heats a room?
A) By radiating heat into the space
B) By releasing microbursts of steam into the room
C) Through natural convection along the outer walls
D) By absorbing the cold in the room
[Ques. 3] Newer-style gun burners with special air-handling parts should be set in what range of CO2 percentage?
A) 79 percent B) 1113 percent C) 911 percent D) 03 percent
[Ques. 4] A manufactured air duct that meets all 15 UL 181 tests is classified as:
A) A flexible air duct.
B) Flexible air plenum.
C) Either a flexible air duct or a flexible air connector.
D) A flexible air connector.
[Ques. 5] A geothermal heat pump system:
A) Uses the ground as a heat source in both heating and cooling.
B) Uses the ground as a heat sink in heating and a heat source in cooling.
C) Uses the ground as a heat sink in both heating and cooling.
D) Uses the ground as a heat source in heating and a heat sink in cooling.
Quick Reply
