CFESA Gas EXAM
24v hot floor igniters have to be replaced if the amp draw exceeds what cost? -
ANS-4.75amps
A combination gas valve combines what 4 separate components right into a single manage?
- ANS-manual close off valve, safety valve, strain regulator, solenoid valve
A combustion air establishing to the outside ought to be one square inch for every _____
Btus if open directly to the out of doors, or by means of vertical duct? - ANS-4000
A confined space linked to an unconfined area requires the combustion air beginning of one
rectangular inch for every _____ Btus? - ANS-a thousand, with no less than 100sq in
A three-quarter elbow is equivalent to how lengthy a pipe? - ANS-2 toes
A 3-zone tee is equal to how lengthy a pipe? - ANS-4 feet if direction of flow modifications,
zero if its straight thru
All out of doors combustion air starting should be blanketed with what? - ANS-Screen, not
smaller than 1/4mesh
Are ball valves repairable? - ANS-In most cases no
Are LP tanks packed with fuel or liquid? - ANS-Liquid
Before starting to test the calibration on any gas thermostat, what need to you test? -
ANS-the adjustment of the skip flame
Before reassembling a burner valve or gas valve, what have to you inspect for? - ANS-you
should check out for any deep scratches within the tapered plug
Can a vent pipe be connected at once to the flue on a piece of gas equipment? - ANS-NO
Can electric powered protection valves fail in part open? - ANS-No
Can hydraulic protection valves fail in part open? - ANS-Yes
Can infrared burners be repaired? - ANS-Some may be rebuilt so long as the burner box is
in suitable shape.
Can pilot burners wear out? If so, how will you recognize when one is worn out? - ANS-Yes,
you will know they may be wiped out whilst you can not get a clean, blue, nicely defined
flame
,Can the tapered plug, within the valve bodies in tapered plug gasoline valves be
interchanged? - ANS-no, they're device and mated together
Commercial bendy gas traces have to have what approvals to be appropriate in maximum
code areas? - ANS-AGA and NSF
Describe in detail how you'll determine if a gas problem is a strain trouble or a quantity
problem? - ANS-Use your manometer to measure the fuel stress with all of the system
became off. Next, switch on the equipment one piece at a time and display the gas strain. If
the fuel strain continues to drop everytime a further piece of gadget is turned on, you have
got a gasoline extent trouble.
Describe the operation of the stress regulator phase of a combination gas valve? - ANS-it
regulates the operating fuel strain in keeping with the pressure on the opening of the valve.
This regulates how a ways the diaphragm is opened or closed
Describe the proper flame for an aerated pilot burner - ANS-the flame could be clear, blue,
and well described
Describe the type of flame wished for a thermocouple to operate properly? - ANS-smooth,
blue, and well described
Do all mixture gasoline valves also regulate the pilot gasoline strain? - ANS-No
Does growing the spring anxiety at the diaphragm of a pressure regulator boom or lower the
gasoline pressure? - ANS-increase the gasoline pressure
Does natural gasoline have any odor? - ANS-No, no longer whilst it comes from the floor and
is wiped clean
Does the skip flame ever go out on an FD thermostat if the flame is well adjusted? Why or
why no longer? - ANS-Yes, on an FDO or FDH thermostat. If the device has reached
operating temperature and the thermostat knob is became down manually, eventually the
pass will go off to allow the equipment to cool down
Does the igniter mild the burner or pilot? - ANS-it lighting the burner on a right away ignition
gadget and a pilot on an intermittent ignition system
During flame rectification in which course is the current extra? - ANS-within the direction of
the bigger surface which is continually ground
Exactly how do you calibrate a FD thermostat? - ANS-first check the calibration of the skip
flame. Test the equipment running temperature with a thermometer. If the calibration id off
from the knob, loosen the 2 adjustment screws and flip the shaft plate. Retighten the screws,
and reinstall the knob. If the adjustment is still off, repeat the method.
, Give the step-via-step method for adjusting the primary air on a burner - ANS-Verify the right
gas pressure, near off the air shutter until the flame turns yellow, the open it up till the flame
turns blue and lock it down
GS thermostats are regularly utilized in what kind of equipment? - ANS-fryers
Hot floor igniters had been at first made of what material? - ANS-silicon carbide
How can a downdraft create device troubles? - ANS-it could blow out pilots and create
issues getting a draft began inside the combustion chamber
How can dirty connections affect thermocouples? - ANS-due to the fact the output is so low,
any dust buildup can cause continuity issues
How can the module tell the distinction among a flame and a sensor shorted to ground? -
ANS-the module senses dc modern-day, if the flame sensor shorted to floor the modern-day
would be ac
How are you able to tell if a gas valve is on or off? - ANS-by the location of the manage
How crucial is the sizing of the flue? Why? - ANS-Very, too small and it'll now not eliminate
all the byproducts, too huge and the vapors condense
How do you regulate the pass flame on a FD series thermostat? - ANS-equal as setting a
skip flame for a BJ thermostat, the skip adjustment screw marked "B" is on the front of the
thermostat
How do you calibrate a GS thermostat? - ANS-with an adjustment screw down the middle of
the thermostat shaft
How do you take a look at the flame sensor current when the igniter is also the sensor? -
ANS-set up a dc millivolt in collection with the ground cord to the module
How do you test the flame sensor present day when there's a separate flame sensor? -
ANS-installation a dc millivolt meter in series with the flame sensor wire
How do you accurate a free thermostat shaft problem on a FD collection thermostat? -
ANS-flip the thermostat all of the manner down and mark the plate and the thermostat frame
with the lining marks. Then get rid of the two adjustment screws. Get rid of the shaft and the
cup-formed plate. Flatten the middle of cup fashioned plate. Reassemble the cup-fashioned
plate and the shaft well, realigning the components with the marks on the thermostat frame.
Recalibrate the thermostat.
How do you recognize what route to install the regulator? - ANS-the regulator will be marked
in or out, or there will an arrow marking proper direction
How do you already know when you have to update a BJ or FD thermostat? - ANS-while
they may not control the temperature or will now not hold adjustment
24v hot floor igniters have to be replaced if the amp draw exceeds what cost? -
ANS-4.75amps
A combination gas valve combines what 4 separate components right into a single manage?
- ANS-manual close off valve, safety valve, strain regulator, solenoid valve
A combustion air establishing to the outside ought to be one square inch for every _____
Btus if open directly to the out of doors, or by means of vertical duct? - ANS-4000
A confined space linked to an unconfined area requires the combustion air beginning of one
rectangular inch for every _____ Btus? - ANS-a thousand, with no less than 100sq in
A three-quarter elbow is equivalent to how lengthy a pipe? - ANS-2 toes
A 3-zone tee is equal to how lengthy a pipe? - ANS-4 feet if direction of flow modifications,
zero if its straight thru
All out of doors combustion air starting should be blanketed with what? - ANS-Screen, not
smaller than 1/4mesh
Are ball valves repairable? - ANS-In most cases no
Are LP tanks packed with fuel or liquid? - ANS-Liquid
Before starting to test the calibration on any gas thermostat, what need to you test? -
ANS-the adjustment of the skip flame
Before reassembling a burner valve or gas valve, what have to you inspect for? - ANS-you
should check out for any deep scratches within the tapered plug
Can a vent pipe be connected at once to the flue on a piece of gas equipment? - ANS-NO
Can electric powered protection valves fail in part open? - ANS-No
Can hydraulic protection valves fail in part open? - ANS-Yes
Can infrared burners be repaired? - ANS-Some may be rebuilt so long as the burner box is
in suitable shape.
Can pilot burners wear out? If so, how will you recognize when one is worn out? - ANS-Yes,
you will know they may be wiped out whilst you can not get a clean, blue, nicely defined
flame
,Can the tapered plug, within the valve bodies in tapered plug gasoline valves be
interchanged? - ANS-no, they're device and mated together
Commercial bendy gas traces have to have what approvals to be appropriate in maximum
code areas? - ANS-AGA and NSF
Describe in detail how you'll determine if a gas problem is a strain trouble or a quantity
problem? - ANS-Use your manometer to measure the fuel stress with all of the system
became off. Next, switch on the equipment one piece at a time and display the gas strain. If
the fuel strain continues to drop everytime a further piece of gadget is turned on, you have
got a gasoline extent trouble.
Describe the operation of the stress regulator phase of a combination gas valve? - ANS-it
regulates the operating fuel strain in keeping with the pressure on the opening of the valve.
This regulates how a ways the diaphragm is opened or closed
Describe the proper flame for an aerated pilot burner - ANS-the flame could be clear, blue,
and well described
Describe the type of flame wished for a thermocouple to operate properly? - ANS-smooth,
blue, and well described
Do all mixture gasoline valves also regulate the pilot gasoline strain? - ANS-No
Does growing the spring anxiety at the diaphragm of a pressure regulator boom or lower the
gasoline pressure? - ANS-increase the gasoline pressure
Does natural gasoline have any odor? - ANS-No, no longer whilst it comes from the floor and
is wiped clean
Does the skip flame ever go out on an FD thermostat if the flame is well adjusted? Why or
why no longer? - ANS-Yes, on an FDO or FDH thermostat. If the device has reached
operating temperature and the thermostat knob is became down manually, eventually the
pass will go off to allow the equipment to cool down
Does the igniter mild the burner or pilot? - ANS-it lighting the burner on a right away ignition
gadget and a pilot on an intermittent ignition system
During flame rectification in which course is the current extra? - ANS-within the direction of
the bigger surface which is continually ground
Exactly how do you calibrate a FD thermostat? - ANS-first check the calibration of the skip
flame. Test the equipment running temperature with a thermometer. If the calibration id off
from the knob, loosen the 2 adjustment screws and flip the shaft plate. Retighten the screws,
and reinstall the knob. If the adjustment is still off, repeat the method.
, Give the step-via-step method for adjusting the primary air on a burner - ANS-Verify the right
gas pressure, near off the air shutter until the flame turns yellow, the open it up till the flame
turns blue and lock it down
GS thermostats are regularly utilized in what kind of equipment? - ANS-fryers
Hot floor igniters had been at first made of what material? - ANS-silicon carbide
How can a downdraft create device troubles? - ANS-it could blow out pilots and create
issues getting a draft began inside the combustion chamber
How can dirty connections affect thermocouples? - ANS-due to the fact the output is so low,
any dust buildup can cause continuity issues
How can the module tell the distinction among a flame and a sensor shorted to ground? -
ANS-the module senses dc modern-day, if the flame sensor shorted to floor the modern-day
would be ac
How are you able to tell if a gas valve is on or off? - ANS-by the location of the manage
How crucial is the sizing of the flue? Why? - ANS-Very, too small and it'll now not eliminate
all the byproducts, too huge and the vapors condense
How do you regulate the pass flame on a FD series thermostat? - ANS-equal as setting a
skip flame for a BJ thermostat, the skip adjustment screw marked "B" is on the front of the
thermostat
How do you calibrate a GS thermostat? - ANS-with an adjustment screw down the middle of
the thermostat shaft
How do you take a look at the flame sensor current when the igniter is also the sensor? -
ANS-set up a dc millivolt in collection with the ground cord to the module
How do you test the flame sensor present day when there's a separate flame sensor? -
ANS-installation a dc millivolt meter in series with the flame sensor wire
How do you accurate a free thermostat shaft problem on a FD collection thermostat? -
ANS-flip the thermostat all of the manner down and mark the plate and the thermostat frame
with the lining marks. Then get rid of the two adjustment screws. Get rid of the shaft and the
cup-formed plate. Flatten the middle of cup fashioned plate. Reassemble the cup-fashioned
plate and the shaft well, realigning the components with the marks on the thermostat frame.
Recalibrate the thermostat.
How do you recognize what route to install the regulator? - ANS-the regulator will be marked
in or out, or there will an arrow marking proper direction
How do you already know when you have to update a BJ or FD thermostat? - ANS-while
they may not control the temperature or will now not hold adjustment
