Block 2 - Maintenance of Gas-Fired Appliances - Service Fuel & Air Delivery Systems Self Assessment

Question 1

Which of the following should be verified to ensure the electrical components are operating properly?

Answer 1

Measure voltage and current levels

Question 2

What is the purpose of following the manufacturer’s documentation during maintenance?

Answer 2

To ensure compliance with detailed diagnostic procedures and troubleshooting guidelines

Question 3

What is the objective of performing diagnostics during the maintenance of gas-fired appliances?

Answer 3

To ensure proper functioning and identify potential issues

Question 4

What should be done with consumable parts that are not serviceable?

Answer 4

Replace them at each maintenance interval

Question 5

What should be inspected regularly for cracks, corrosion, or other signs of damage in gas-fired appliances?

Answer 5

Heat Exchanger

Question 6

What should be checked for signs of wear, imbalance, or damage that could affect airflow in gas-fired appliances?

Answer 6

Fans

Question 7

Which component should be cleaned to remove dirt, dust, and debris that could affect performance in gas-fired appliances?

Answer 7

Burner

Question 8

What should be done to detect excessive vibration that may indicate misalignment or mechanical issues?

Answer 8

Use vibration monitoring tools

Question 9

What should be done to ensure proper exhaust of combustion gases in the venting system?

Answer 9

Verify the vent termination is clear and free from blockages

Question 10

What should be done to maintain a comprehensive record of the system’s condition during diagnostics?

Answer 10

Document all measurements, observations, and adjustments

Question 11

What could happen if the orifice sealing edge is damaged during removal or reinstallation?

Answer 11

The regulator will fail to lock up properly

Question 12

What should be done before adding oil to bearings and linkage joints?

Answer 12

Ensure they are clean

Question 13

Before performing maintenance on a gas pressure regulator, what must be done first?

Answer 13

Isolate the regulator from system pressure and relieve internal pressure

Question 14

What material is introduced into a lubricated plug valve to create a gas-tight seal?

Answer 14

Specific sealant material

Question 15

What should be inspected before applying oil to cams?

Answer 15

The track spring and the wheel it rides on

Question 16

What parts are typically NOT included in OEM rebuild kits for lever action regulators?

Answer 16

Lever or linkage sets

Question 17

What is the maximum allowable leakage during a safety shutoff valve leak test?

Answer 17

15 bubbles per minute

Question 18

What is an indication that a combustion air pressure switch is faulty?

Answer 18

The switch has visible corrosion

Question 19

What should be done when reassembling a pilot-operated relief valve?

Answer 19

Replace all O-rings and lubricate them

Question 20

What is one of the top causes of motor failure?

Answer 20

Bearing failure

Question 21

What is a good practice after installing a new motor bearing?

Answer 21

Test the motor without a load for any issues

Question 22

What does a combustion air pressure switch ensure?

Answer 22

Proper combustion air flow before ignition

Question 23

What component in air handling equipment requires lubrication?

Answer 23

Blower wheels

Question 24

What should the pressure switch be set to for proper operation?

Answer 24

80-90% of the high fire air pressure

Question 25

What should be done if the regulator is installed upside down or horizontally?

Answer 25

Readjust the regulator

Question 26

What type of test is used to check for imbalances or misalignments for an electric motor?

Answer 26

Vibration test

Question 27

What is a sign that enough grease has been added?

Answer 27

Grease coming out of the purge valve

Question 28

What is the standard slope required for a sensing line to drain correctly?

Answer 28

1/4 inch per foot

Question 29

What should be done if a safety shutoff valve continues to exceed allowable leakage limits after retesting?

Answer 29

Remove the valve from service

Question 30

What is an alternative method to measure leakage for a safety shutoff valve?

Answer 30

Measuring bubbles per minute in water

Question 31

Why should sandpaper not be used to clean the motor shaft?

Answer 31

It leaves behind grit particles

Question 32

What is the maximum recommended interval for parts replacement on larger regulators as per Fisher's recommendations?

Answer 32

10 years

Question 33

What can over-greasing a motor bearing cause?

Answer 33

Pressure buildup leading to heat and damage

Question 34

What tool should be used to remove old bearings?

Answer 34

A bearing puller

Question 35

Which manual should be referred to for the repair and maintenance of the Fisher LS200 Regulator?

Answer 35

Fisher LS200 Regulator Manual

Question 36

How often should motor bearings be greased?

Answer 36

Based on the motor load, run time, and ambient temperature

Question 36

What test ensures the motor insulation is intact?

Answer 36

Megger test

Question 37

What should be done before applying grease to a bearing?

Answer 37

Remove the purge valve cover and clean grease fittings

Question 38

When inspecting a regulator disk or pad, what should be done

Answer 38

1) Replace if damaged 2) Check all O-rings and replace if necessary 3) Lubricate the O-rings and apply anti-seize compound

Question 39

Why should risky shortcut methods like torches or oil baths be avoided when heating bearings?

Answer 39

They may overheat or damage the bearing

Question 40

What should be done if the sealant injection system is blocked within a lubricated plug valve?

Answer 40

Use valve purge compound to remove the blockage

Question 41

What should be done if the air switch tests okay but the equipment is still not working correctly?

Answer 41

Jumper the air switch to see if the problem goes away

Question 42

What precaution should be taken when loosening the diaphragm casing cap screws?

Answer 42

Ensure the control spring has no force applied