Gas Troubleshooting IV
Gas Troubleshooting IV
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Question 1 |
An indoor blower motor will run, but it cycles on an internal overload protector. Using a digital meter, tech A states that the meter reads zero when placing it across the motor’s run capacitor and the run capacitor must be replaced. Tech B states that the meter read OL when placing it across the run capacitor, and it must be replaced. Which tech would have the correct diagnosis?
A | Tech A |
B | Tech B |
C | Both techs are correct |
D | Both techs are incorrect |
Question 2 |
A furnace has been operating well during mild winters. During the very cold days, the customer complains that the 3 year old furnace does not provide continuous heat to satisfy the demand. The tech does a btu input measurement by clocking the gas meter and finds the system within specifications. The temperature rise is also within system limits. Which of the following would be the most correct diagnosis?
A | The furnace was undersized in heating capacity |
B | The gas pressure needs to be increased |
C | The ductwork needs redesigning |
D | None of the above |
Question 3 |
During furnace operations, the thermostat is quickly satisfied. The new furnace heats the entire house very fast then shuts off on thermostat demand. Which would be the most correct statement of this situation?
A | The thermostat needs replacing |
B | The blower speed should be increased |
C | The furnace heating capacity is oversized |
D | The duct system is too large |
Question 4 |
Two gas furnaces were installed. Both furnaces were 150,000btuh. Both furnaces may operate at the same time. When one furnace is running all operations are satisfactory. When both furnaces are operating at the same time, the burner flames of both furnaces decrease in size. Which procedure is most likely to be correct?
A | Replace the heating thermostat |
B | Increase the gas pressure regulator of the first furnace |
C | Replace both gas valves |
D | Determine if the gas piping layout is properly sized. |
Question 5 |
On a natural gas to LPG furnace conversion, tech A states that only the burner orifices need changing. Tech B states that the orifice’s gas valve regulator spring and pilot orifice should be changed. Which tech is correct?
A | Tech A |
B | Tech B |
C | Both techs are correct |
D | Both techs are incorrect |
Question 6 |
A draft test has been performed and is indicating that there is an improper draft for the gas furnace that is being used. Which of the following would be the correct procedure to perform?
A | Increase the gas pressure |
B | Increase the induced draft motor speed |
C | Check for chimney obstructions |
D | Replace the heat exchanger |
Question 7 |
On an LPG furnace installation, the burner flames are low and the new furnace is sooting up. Which of the following would be the most correct procedure to solve this problem?
A | Replace the gas valve |
B | Measure gas pressure and install a low gas pressure switch |
C | Call the LPG fuel provider for service |
D | Clean the heat exchanger and operate the furnace. |
Question 8 |
A crack has been detected on a heat exchanger. The furnace is only 5 years old. Which of the following would be the most correct procedure to perform?
A | Replace the entire furnace |
B | Replace the heat exchanger under manufacturer’s warranty |
C | Replace the completer ductwork and furnace |
D | None of the above |
Question 9 |
On a belt drive indoor blower motor, a fan belt needs replacing. Tech A says that if you adjust the belt to ride higher on the pulley, you will increase the blower speed. Tech B says that if you adjust the belt to ride lower into the pulley, you will increase the blower speed. Which tech is correct?
A | Tech A |
B | Tech B |
C | Both techs are correct |
D | Both techs are incorrect |
Question 10 |
A tech replaces a fan belt and a fan motor. The new motor is operating with too high of an amp draw. What is most likely the cause of this fault?
A | The belt was adjusted too tightly |
B | The belt was adjusted too loosely |
C | The motor horsepower is too low |
D | Both a and c |
Question 11 |
On a no heat call, a fan motor is not operating during the heating cycle. Tech A measures voltage at the fans relay’s normally open contacts. Tech B measures voltage at the bimetal fan control. Which tech performed the correct procedure?
A | Tech A |
B | Tech B |
C | Both techs are correct |
D | Both techs are incorrect |
Question 12 |
The amperage of an indoor blower motor must be determined during the heating operation of a furnace. Where should this reading be taken?
A | After the N.O. contacts at the fan relay |
B | Before the N.O. contacts at the fan relay |
C | At the high speed on the motor |
D | At the red or white wire on the motor |
Question 13 |
Where should a resistance reading be taken when measuring the low speed of an indoor blower motor?
A | At the red wire and green ground wire on the motor |
B | At the red wire and white wire on the motor |
C | At the black wire and the white wire on the motor |
D | At the yellow wire and the green ground wire on the motor |
Question 14 |
A frequently used fireplace satisfies a thermostat located in the same room as the fireplace. This shuts down the call for heat while the greater portion of the home remains cold. What should the technician. What should the tech do to solve this problem?
A | Compensate by turning the thermostat higher |
B | Damper down the fireplace control |
C | Relocate the thermostat |
D | Increase gas pressure at the furnace. |
Question 15 |
What will an extremely dirty air filter do to furnace operation?
A | Cause the furnace to shut off on the limit control |
B | Cause the indoor blower motor to overheat |
C | Cause an increase of furnace temperature rise |
D | All of the above |
Question 16 |
Where can a limit control be wired in a gas fired furnace?
A | In the high voltage circuit |
B | In the low voltage circuit |
C | In the high or low voltage circuit |
D | None of the above |
Question 17 |
How are limit controls and flame roll out sensors wired into their circuits?
A | In series with each other |
B | In parallel with each other |
C | In series parallel with each other |
D | None of the above |
Question 18 |
A limit control should never be
A | Wired in the high voltage circuit |
B | Wired in the low voltage circuit |
C | Bypassed permanently |
D | None of the above |
Question 19 |
Most limit controls that are wired on the high voltage side of a circuit are in series with the transformer. Where would a voltage check be made to see if there is proper source voltage to the transformer?
A | After the limit control and at the common of the transformer |
B | Before the limit control and at the common of the transformer |
C | At both leads of the transformer |
D | Both a and c |
Question 20 |
Adjusting a heat anticipator to a higher setting will
A | Provide a longer burner cycle |
B | Provide a shorter burner cycle |
C | Cause the indoor fan motor to short cycle |
D | Prematurely shut off the gas valve |
Question 21 |
A service call is made to a customer who complains that the furnace circuit breaker will not stay in the on position. Tech A sys that the problem can be in the blower motor or the primary side of the transformer. Tech B says that the problem is most likely in the heating controls circuit. Which tech is the most likely correct in the diagnosis?
A | Tech A |
B | Tech B |
C | Both tech A and B are correct |
D | Both tech A and B are incorrect |
Question 22 |
An induced draft motor is not operating when the thermostat is calling for heat. What would be the most correct test to make?
A | An amperage check at the motor |
B | A resistance check of the motor |
C | A voltage check on the circuit board at induced draft motor terminals |
D | A voltage check at the primary of the transformer |
Question 23 |
Which of the following residential furnace components would be checked for 24v operation?
A | Inducer motor |
B | Blower motor |
C | Pressure switch |
D | Primary of transformer |
Question 24 |
Tech A says to ensure that a heating thermostat is in the closed position, a voltage check at R and W should read 24v. tech B says to ensure that a heating thermostat is in the closed position, a voltage check at C and W would read 24v. Which tech is correct?
A | Tech A |
B | Tech B |
C | Both techs are correct |
D | Both techs are incorrect |
Question 25 |
Which of the following is not a thermostat problem?
A | Improper anticipator setting |
B | Subbase not level |
C | Furnace switch turned off |
D | Loose connection at subbase |
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