GAS HEAT ESCO EXAM 100 QUESTIONS & CORRECT
ANSWERS LATEST 2025
A gas furnace to be installed in a garage. The national standards requires that the
burners and ignition must be located ____ above the floor: - ANSWER-18 inches
A good description of how a bi-metal fan switch operates the blower motor on a
gas furnace is: - ANSWER-Temperature on/ Temperature off
Redundant gas valves used on gas furnaces will shut down if gas pressure
exceeds: - ANSWER-13.5 in W.C. (or 1/2 psi)
This is the maximum pressure for gas valve operation
Burning one cubic foot of Liquefied Petroleum gas completely will produce
approximately ____ BTUs. - ANSWER-2,000 - 2,500
LP gas has a specific gravity of ...? - ANSWER-1.5 - 2.0 ( actual is 1.5 heavier than
air which is 1.0)
What is the purpose of a spoiler screw located on a burner, or adjustable-
shutters? - ANSWER-to mix primary air and gas
Furnace limit switches are wired in series with the: - ANSWER-Gas valve
, A technician is using an extension ladder to work on roof top unit. The top of the
ladder should extend _____ beyond the support point. - ANSWER-3 feet
A technician determines that a natural gas furnace has a defective heat
exchanger. The technician should: - ANSWER-Inform the home owner and turn
the gas off.
A natural gas furnace usually requires _____ gas pressure AT the manifold and
burners.
What should the inlet pressure be to the manifold? - ANSWER-3.5 in WC
inlet- 5-7 in WC
The vent system for a condensing furnace is classified as ___ by the National Field
Gas Code. - ANSWER-Category IV (4)
Type B vent pipe must be kept at least ____ from combustible materials. -
ANSWER-one inch
Typical condensing furnaces have an AFUE rating of at least: - ANSWER-90%
You have installed a Category IV two-pipe vent system that terminates through
the roof of the residence. The elbow for the combustion air intake, above the
roof, should...? - ANSWER-Point down
The reason heating thermostats have anticipators is to: - ANSWER-reduce
overshoot
ANSWERS LATEST 2025
A gas furnace to be installed in a garage. The national standards requires that the
burners and ignition must be located ____ above the floor: - ANSWER-18 inches
A good description of how a bi-metal fan switch operates the blower motor on a
gas furnace is: - ANSWER-Temperature on/ Temperature off
Redundant gas valves used on gas furnaces will shut down if gas pressure
exceeds: - ANSWER-13.5 in W.C. (or 1/2 psi)
This is the maximum pressure for gas valve operation
Burning one cubic foot of Liquefied Petroleum gas completely will produce
approximately ____ BTUs. - ANSWER-2,000 - 2,500
LP gas has a specific gravity of ...? - ANSWER-1.5 - 2.0 ( actual is 1.5 heavier than
air which is 1.0)
What is the purpose of a spoiler screw located on a burner, or adjustable-
shutters? - ANSWER-to mix primary air and gas
Furnace limit switches are wired in series with the: - ANSWER-Gas valve
, A technician is using an extension ladder to work on roof top unit. The top of the
ladder should extend _____ beyond the support point. - ANSWER-3 feet
A technician determines that a natural gas furnace has a defective heat
exchanger. The technician should: - ANSWER-Inform the home owner and turn
the gas off.
A natural gas furnace usually requires _____ gas pressure AT the manifold and
burners.
What should the inlet pressure be to the manifold? - ANSWER-3.5 in WC
inlet- 5-7 in WC
The vent system for a condensing furnace is classified as ___ by the National Field
Gas Code. - ANSWER-Category IV (4)
Type B vent pipe must be kept at least ____ from combustible materials. -
ANSWER-one inch
Typical condensing furnaces have an AFUE rating of at least: - ANSWER-90%
You have installed a Category IV two-pipe vent system that terminates through
the roof of the residence. The elbow for the combustion air intake, above the
roof, should...? - ANSWER-Point down
The reason heating thermostats have anticipators is to: - ANSWER-reduce
overshoot
