Block 2 - Maintenance of Gas-Fired Appliances - Service Fuel & Air Delivery Systems Flashcards
Why are maintenance procedures for gas-fired appliances crucial?
To ensure their safe and efficient operation.
Specific maintenance requirements may vary depending on the type and model of the appliance.
What should be inspected regularly on the heat exchanger?
Cracks, corrosion, and other signs of damage.
Cleaning surfaces to remove soot, scale, or debris is essential for efficiency.
What is a key task when inspecting the venting system?
Check for obstructions such as bird nests or debris.
Ensure vent pipes are securely connected and free from gaps or leaks.
What indicates efficient combustion in a burner?
Blue flames.
Yellow or orange flames may indicate an issue.
What maintenance is required for pumps?
Check operation, lubricate bearings, inspect for leaks, and verify motor performance.
Proper alignment and tension of belts are also important.
What should be inspected on fans?
Signs of wear, imbalance, or damage.
Clean fan blades and check motor bearings for wear.
What must be tested on safety valves?
Proper operation and ensure they are not stuck or malfunctioning.
What is the objective of inspecting flue gas exhaust systems?
Check for obstructions and integrity of venting materials.
Ensure draft control devices are operating correctly.
What should be done with combustion air fans during maintenance?
Inspect for proper operation and cleanliness.
Ensure motors and bearings are in good condition.
What is a general maintenance tip related to record keeping?
Keep detailed records of maintenance activities, including dates and tasks performed.
True or False: Regular inspections should only be conducted during heating seasons.
False.
Inspections should be conducted regularly, even during non-heating seasons.
What is the purpose of diagnostics during maintenance?
To ensure proper functioning and identify potential issues.
What should be visually inspected during diagnostics?
Signs of wear, damage, or irregularities in components.
Look for cracks, corrosion, or leaks.
What electrical parameters should be measured?
Voltage and current levels.
Ensure they are within the manufacturer’s specified ranges.
What is the objective of measuring temperatures during diagnostics?
Ensure that temperatures are within the acceptable range for components.
Fill in the blank: Pressures must be confirmed at the required levels for _______.
[safe and efficient operation]
What should flow rates be compared against?
The manufacturer’s recommendations.
What is the purpose of confirming compliance with the manufacturer’s specifications?
To ensure the appliance is operating according to guidelines.
What should be done if excessive vibration is detected?
Use vibration monitoring tools and inspect for loose components.
What is an important aspect of documentation during diagnostics?
Document all measurements, observations, and adjustments made.
What is the benefit of comparing current readings with historical data?
To identify trends or deviations that may indicate emerging issues.
What is a systematic approach in diagnostics?
Starting with visual inspection before moving on to specific parameters.
What is the purpose of replacing consumable OEM parts?
They may require replacement rather than repair because they are not serviceable.
What does the regulator repair/maintenance in this lesson refer to?
The ‘Fisher LS200 Regulator Manual’
This manual provides guidelines for maintaining and repairing the Fisher LS200 regulator.
What is the maximum recommended time interval for regulator maintenance and inspection according to Fisher?
Every 10 years
This recommendation is for parts replacement and ensures the regulator functions correctly.
What should be done before attempting any maintenance or disassembly of a regulator?
Isolate the regulator from system pressure and relieve all internal pressure
This step is crucial to avoid personal injury or equipment damage.
What should be checked and cleaned if a screen flow streamer is included?
Check and clean the screen flow streamer
Operation with a dirty screen flow streamer can cause performance drop.
What should be ensured when replacing the balance diaphragm and orifice?
Follow all steps and precautions carefully
Proper alignment and care during installation are essential to avoid damage.
True or False: Lever action regulators come with replacement kits that include lever or linkage sets.
False
These kits do not include lever or linkage sets; a new regulator should be purchased if those parts need replacement.
What is the suggested maintenance frequency for relief valve parts?
Depending upon service conditions
Regular inspection is necessary to ensure proper functionality.
What type of lubricant should be used on O-rings during reassembly of relief valves?
Lightly lubricated before assembly
This helps ensure a proper seal and function.
Fill in the blank: The sensing line should be checked for _______ and cleaned if needed.
debris
Ensuring the sensing line is clear is vital for accurate regulator operation.
What is the function of a lubricated plug valve?
To permit flow when rotated to align the hole with the downstream direction of the pipe
The grease barrier prevents close contact between the plug and body.
What are the two general procedures applicable to lubricated plug valves?
Stick Sealant Service Procedure and Sealant Gun Service
These methods are used for injecting sealant into the valve.
What should be done if the sealant is not being injected into the valve?
Use valve flush purge compound to break up obstructions
This can help clear blockages preventing sealant from entering.
What is the suggested valve leak test frequency according to the manufacturer?
Annually or during PM maintenance
This ensures safe and reliable operation of the valves.
What is the acceptable leakage limit for valves according to local codes?
15 bubbles per minute
Exceeding this limit requires immediate attention and possible removal from service.
Fill in the blank: Safety shut-off valves often have _______ that can be replaced.
proof of closure switches
While many SSOVs are non-serviceable, some parts can still be replaced.
What should be done if a control spring of a different set pressure range is installed?
Remove the set pressure range on the spring case and indicate the new range
This ensures that the regulator operates correctly with the new spring.
What is a key consideration when tightening bolts during maintenance?
Torque them to the correct specifications
Proper torque is crucial for the integrity and safety of the assembly.
What are SSOVs?
Non-serviceable valves that cannot be repaired if they break down, like Maxon and Eclipse valves.
Some parts, like proof of closure switches, may still be replaceable.
Which solenoid valves can be repaired?
ASCO valves can be repaired with kits that include diaphragm, spring, O-rings, etc.
Repair kits provide a comprehensive solution for solenoid valve maintenance.
What is a benefit of using repair kits for Honeywell V5055 valves?
Repair kits allow for maintenance without removing the valve body from the piping.
What is the status of the Honeywell V4055 actuator?
Non-serviceable and needs to be replaced if it leaks hydraulic fluid.
Core replacement options may provide discounts on rebuilt actuators.
What should be done to bearings and linkage connections?
They should be lubricated with a light oil and inspected for cleanliness and tightness.
What is a typical greasing schedule for motor bearings?
Intervals can be every month, quarter, or year depending on motor load, run time, and ambient temperature.
What are the consequences of over-greasing motor bearings?
Can cause internal bearing pressure, higher friction and heat, and damage seals.
How should you grease motor bearings?
Grease should be applied while the motor is running and warm, dispensing the recommended amount through grease fittings.
What are the steps to test an electric motor?
Conduct electrical tests, vibration tests, thermal tests, dynamic tests, noise tests, and insulation tests.
What is the function of a combustion air pressure switch?
Ensures the proper flow of combustion air before ignition begins.
What should be checked during a visual inspection of a combustion air pressure switch?
Look for burnt wires, corrosion, or physical damage.
What indicates a faulty combustion air pressure switch during continuity testing?
If there is no continuity after blowing into the tubing connected to the switch.
What should the pressure switch be set to in relation to the high fire pressure reading?
About 80% to 90% lower than the high fire pressure reading.
True or False: The air pressure switch is typically located downstream of the control valve.
False. It is located upstream of the control valve.
Fill in the blank: The manufacturer of the motor and the manufacturer of the bearing will have a specific recommended _______.
greasing schedule.
What should be done if there is play in the bearings?
They should be replaced.
What can cause premature wear of motor bearings?
Insufficient lubrication leading to higher friction and heat.
What is the purpose of a grease gun in greasing motor bearings?
To dispense the exact amount of grease needed.
What should be done if grease comes out of the purge valve during greasing?
Stop adding any more grease to avoid overfilling issues.
How can you ensure the motor shaft is clean before installing new bearings?
Remove corrosion, moisture, and dust particles using a Scotch-Brite pad.
What is a safe method to heat a bearing for installation?
Using a proper induction heater with a demagnetization cycle.
What are key signs of motor bearing failure?
Corrosion damage, presence of water, and grit particles in lubrication.
