Block 2 - Maintenance of Gas-Fired Appliances - Service Fuel & Air Delivery Systems Self Assessment Flashcards
Which of the following should be verified to ensure the electrical components are operating properly?
Measure voltage and current levels
What is the purpose of following the manufacturer’s documentation during maintenance?
To ensure compliance with detailed diagnostic procedures and troubleshooting guidelines
What is the objective of performing diagnostics during the maintenance of gas-fired appliances?
To ensure proper functioning and identify potential issues
What should be done with consumable parts that are not serviceable?
Replace them at each maintenance interval
What should be inspected regularly for cracks, corrosion, or other signs of damage in gas-fired appliances?
Heat Exchanger
What should be checked for signs of wear, imbalance, or damage that could affect airflow in gas-fired appliances?
Fans
Which component should be cleaned to remove dirt, dust, and debris that could affect performance in gas-fired appliances?
Burner
What should be done to detect excessive vibration that may indicate misalignment or mechanical issues?
Use vibration monitoring tools
What should be done to ensure proper exhaust of combustion gases in the venting system?
Verify the vent termination is clear and free from blockages
What should be done to maintain a comprehensive record of the system’s condition during diagnostics?
Document all measurements, observations, and adjustments
What could happen if the orifice sealing edge is damaged during removal or reinstallation?
The regulator will fail to lock up properly
What should be done before adding oil to bearings and linkage joints?
Ensure they are clean
Before performing maintenance on a gas pressure regulator, what must be done first?
Isolate the regulator from system pressure and relieve internal pressure
What material is introduced into a lubricated plug valve to create a gas-tight seal?
Specific sealant material
What should be inspected before applying oil to cams?
The track spring and the wheel it rides on
What parts are typically NOT included in OEM rebuild kits for lever action regulators?
Lever or linkage sets
What is the maximum allowable leakage during a safety shutoff valve leak test?
15 bubbles per minute
What is an indication that a combustion air pressure switch is faulty?
The switch has visible corrosion
What should be done when reassembling a pilot-operated relief valve?
Replace all O-rings and lubricate them
What is one of the top causes of motor failure?
Bearing failure
What is a good practice after installing a new motor bearing?
Test the motor without a load for any issues
What does a combustion air pressure switch ensure?
Proper combustion air flow before ignition
What component in air handling equipment requires lubrication?
Blower wheels
What should the pressure switch be set to for proper operation?
80-90% of the high fire air pressure
What should be done if the regulator is installed upside down or horizontally?
Readjust the regulator
What type of test is used to check for imbalances or misalignments for an electric motor?
Vibration test
What is a sign that enough grease has been added?
Grease coming out of the purge valve
What is the standard slope required for a sensing line to drain correctly?
1/4 inch per foot
What should be done if a safety shutoff valve continues to exceed allowable leakage limits after retesting?
Remove the valve from service
What is an alternative method to measure leakage for a safety shutoff valve?
Measuring bubbles per minute in water
Why should sandpaper not be used to clean the motor shaft?
It leaves behind grit particles
What is the maximum recommended interval for parts replacement on larger regulators as per Fisher’s recommendations?
10 years
What can over-greasing a motor bearing cause?
Pressure buildup leading to heat and damage
What tool should be used to remove old bearings?
A bearing puller
Which manual should be referred to for the repair and maintenance of the Fisher LS200 Regulator?
Fisher LS200 Regulator Manual
How often should motor bearings be greased?
Based on the motor load, run time, and ambient temperature
What test ensures the motor insulation is intact?
Megger test
What should be done before applying grease to a bearing?
Remove the purge valve cover and clean grease fittings
When inspecting a regulator disk or pad, what should be done
1) Replace if damaged
2) Check all O-rings and replace if necessary
3) Lubricate the O-rings and apply anti-seize compound
Why should risky shortcut methods like torches or oil baths be avoided when heating bearings?
They may overheat or damage the bearing
What should be done if the sealant injection system is blocked within a lubricated plug valve?
Use valve purge compound to remove the blockage
What should be done if the air switch tests okay but the equipment is still not working correctly?
Jumper the air switch to see if the problem goes away
What precaution should be taken when loosening the diaphragm casing cap screws?
Ensure the control spring has no force applied
