G2 GAS TECHNICIAN MODULE 17
REVISED EXAM 2025 QUESTIONS
AND ANSWERS
What are the factors governing a conversion? - ....ANSWER ...-Availability of gas,
efficiency if converted, access to combustible air, satisfactory ductwork, can a chimney
liner be installed, clearances from combustibles, manufactures recommendations, if a
water heater is also being installed (common vent or power vent), and age of the
appliance
Oil fired furnaces are recommended not to be converted at a certain age what is age is
this? - ....ANSWER ...-10 years clause 4.3.5
What are the responsibilities of the installer when converting? - ....ANSWER ...-
Determine that it can accept gas and will operate satisfactory for a reasonable length of
time.
What must be done when converting a boiler? - ....ANSWER ...-1. Check for
revirtible flue; center line must be at leas 12" above burner port
2. Visually inspect for leaks
3. Open drain at bottom and flush until water is clear
4. Sediment can hide a leak at the bottom
...©️ 2025, ALL RIGHTS RESERVED 1
, Where must a pressure relief drop tube be located on a boiler? - ....ANSWER ...-
The pressure relief tube must be withing 12" of the floor
What must be done if a warm air furnace does not have a revertible flue? -
....ANSWER ...-Center line of the flue collar is 12" above burner port and
barometric draft regulator can be installed so relief opening is 12" above the highest flue
passage.
Can you convert a forced air furnace with a secondary heating surface on the suction side
of the air blower? - ....ANSWER ...-No. Unless the heating surface consists of a
single cylinder flue pope passing directly from the primary heat exchange to the flue
collar and has a continuously gas tight welded joint.
How do you check a heat exchanger? - ....ANSWER ...-1. Smoke in fire chamber
(plug the flue outlet)
2. Light and mirror, check for cracks
3. warping and distortion of heat exchanger
4. Rust Spots
5. Gaskets on joints.
How do you determine the firing rate of a replacement burner? - ....ANSWER ...-1.
Heat loss calculations of the building
2. Input or output on rating plate
3. Nozzle size in the burner
...©️ 2025, ALL RIGHTS RESERVED 2
REVISED EXAM 2025 QUESTIONS
AND ANSWERS
What are the factors governing a conversion? - ....ANSWER ...-Availability of gas,
efficiency if converted, access to combustible air, satisfactory ductwork, can a chimney
liner be installed, clearances from combustibles, manufactures recommendations, if a
water heater is also being installed (common vent or power vent), and age of the
appliance
Oil fired furnaces are recommended not to be converted at a certain age what is age is
this? - ....ANSWER ...-10 years clause 4.3.5
What are the responsibilities of the installer when converting? - ....ANSWER ...-
Determine that it can accept gas and will operate satisfactory for a reasonable length of
time.
What must be done when converting a boiler? - ....ANSWER ...-1. Check for
revirtible flue; center line must be at leas 12" above burner port
2. Visually inspect for leaks
3. Open drain at bottom and flush until water is clear
4. Sediment can hide a leak at the bottom
...©️ 2025, ALL RIGHTS RESERVED 1
, Where must a pressure relief drop tube be located on a boiler? - ....ANSWER ...-
The pressure relief tube must be withing 12" of the floor
What must be done if a warm air furnace does not have a revertible flue? -
....ANSWER ...-Center line of the flue collar is 12" above burner port and
barometric draft regulator can be installed so relief opening is 12" above the highest flue
passage.
Can you convert a forced air furnace with a secondary heating surface on the suction side
of the air blower? - ....ANSWER ...-No. Unless the heating surface consists of a
single cylinder flue pope passing directly from the primary heat exchange to the flue
collar and has a continuously gas tight welded joint.
How do you check a heat exchanger? - ....ANSWER ...-1. Smoke in fire chamber
(plug the flue outlet)
2. Light and mirror, check for cracks
3. warping and distortion of heat exchanger
4. Rust Spots
5. Gaskets on joints.
How do you determine the firing rate of a replacement burner? - ....ANSWER ...-1.
Heat loss calculations of the building
2. Input or output on rating plate
3. Nozzle size in the burner
...©️ 2025, ALL RIGHTS RESERVED 2
