Gas Heat esco exam Questions and
Answers 100% Pass
A gas furnace to be installed in a garage. The national standards requires that the
burners and ignition must be located ____ above the floor: - ✔✔18 inches
A good description of how a bi-metal fan switch operates the blower motor on a gas
furnace is: - ✔✔Temperature on/ Temperature off
Redundant gas valves used on gas furnaces will shut down if gas pressure exceeds: -
✔✔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. - ✔✔2,000 - 2,500
LP gas has a specific gravity of ...? - ✔✔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? -
✔✔to mix primary air and gas
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, Furnace limit switches are wired in series with the: - ✔✔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. - ✔✔3 feet
A technician determines that a natural gas furnace has a defective heat exchanger. The
technician should: - ✔✔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? - ✔✔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. - ✔✔Category IV (4)
Type B vent pipe must be kept at least ____ from combustible materials. - ✔✔one inch
Typical condensing furnaces have an AFUE rating of at least: - ✔✔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...? -
✔✔Point down
The reason heating thermostats have anticipators is to: - ✔✔reduce overshoot
The typical fluw gas temperature of a Category III furnace is: - ✔✔280 F - 300 F
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Answers 100% Pass
A gas furnace to be installed in a garage. The national standards requires that the
burners and ignition must be located ____ above the floor: - ✔✔18 inches
A good description of how a bi-metal fan switch operates the blower motor on a gas
furnace is: - ✔✔Temperature on/ Temperature off
Redundant gas valves used on gas furnaces will shut down if gas pressure exceeds: -
✔✔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. - ✔✔2,000 - 2,500
LP gas has a specific gravity of ...? - ✔✔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? -
✔✔to mix primary air and gas
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, Furnace limit switches are wired in series with the: - ✔✔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. - ✔✔3 feet
A technician determines that a natural gas furnace has a defective heat exchanger. The
technician should: - ✔✔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? - ✔✔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. - ✔✔Category IV (4)
Type B vent pipe must be kept at least ____ from combustible materials. - ✔✔one inch
Typical condensing furnaces have an AFUE rating of at least: - ✔✔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...? -
✔✔Point down
The reason heating thermostats have anticipators is to: - ✔✔reduce overshoot
The typical fluw gas temperature of a Category III furnace is: - ✔✔280 F - 300 F
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