4BE3.5 U4 C3 Obj 1 EMH

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Questions and Answers

EASY What is the primary reason for regular checks of hot water heating boilers?

To ensure continuous supervision

To ensure safe and efficient operation during unsupervised periods (correct)

To adjust the water temperature

To monitor the burner flame condition only

What is the primary function of the programmed combustion control?

To maintain safe and efficient burner operation (correct)

To sequence the operation of the pump

To adjust the make-up water supply

To monitor the stack temperature

What is the recommended colour of the burner flame when burning natural gas?

Predominantly blue (correct)

Predominantly yellow

Predominantly orange

Predominantly white

What does a white plume from the chimney indicate?

The presence of water vapour from the combustion process Signup and view all the answers

What is the purpose of monitoring the stack temperature?

To ensure safe and efficient boiler operation Signup and view all the answers

What is the purpose of the daily routine procedures?

To ensure safe and dependable boiler operation Signup and view all the answers

What should the burner flame signal on the flame scanner or programmed combustion control indicate?

A safe and efficient burner operation Signup and view all the answers

What is the recommended colour of the burner flame when burning light fuel oil?

Bright yellow with orange at the tips Signup and view all the answers

What is a common cause of a smoky flame?

Dirty burner nozzle Signup and view all the answers

Why is it important to regularly check the flue gas temperature?

To identify fouling of the heating surfaces Signup and view all the answers

What is the result of a gradual increase in flue gas temperature?

Reduced heat transfer efficiency Signup and view all the answers

What is a possible cause of high flue gas temperature?

Excessive excess air Signup and view all the answers

Why should the hot water supply set point not be below 75°C?

To prevent flue gas condensation Signup and view all the answers

What is the maximum operating temperature for hot water heating boilers?

120°C Signup and view all the answers

What is the recommended minimum differential between the safety relief valve set pressure and the boiler operating pressure?

69 kPa Signup and view all the answers

What is the purpose of checking the boiler discharge water temperature?

To ensure the water temperature is at or near the hot water supply set point Signup and view all the answers

What is a possible cause of a high flue gas temperature?

Over-firing of the boiler Signup and view all the answers

Why should the high temperature cut-off be set to below 120°C?

To prevent boiler damage Signup and view all the answers

What may happen if solid deposits form on the safety valve seats?

The valve may not open at its set pressure Signup and view all the answers

Why is it essential to regularly check that the heating system is completely filled with water?

To ensure satisfactory operation of the entire system Signup and view all the answers

What may cause water losses in a hot water heating system?

Leaking piping and valves, leaking circulating pump packing or seals, and leaking boiler Signup and view all the answers

What is the purpose of an automatic feed valve in a hot water heating system?

To add make-up water to the system Signup and view all the answers

What may happen if the expansion tank is full and unable to accommodate the increase in water volume?

The safety valve will open and discharge water Signup and view all the answers

Why should the expansion tank be regularly checked?

To ensure the tank has adequate room for expansion Signup and view all the answers

What is the correct procedure to check the air charge in a bladder-style expansion tank?

Isolate the tank, drain the water, and use a tire pressure gauge to read the tank pressure Signup and view all the answers

What may be a sign of a damaged bladder in a bladder-style expansion tank?

Water issuing forth with air when the Schrader valve stem is depressed Signup and view all the answers

Why is it recommended to install a water meter in the make-up line?

To detect leaks in the piping and heat exchangers Signup and view all the answers

What may happen if water losses are left unaddressed in a hot water heating system?

Parts of the building will be cold, and the upper part of the piping system will run dry Signup and view all the answers

Why is it important to determine and repair the cause of an air leak before returning the expansion tank from service?

To prevent the tank from filling with water Signup and view all the answers

What is the purpose of shutting the valve to the boiler or heating system when draining the expansion tank?

To isolate the tank for maintenance Signup and view all the answers

What is the purpose of using pipe plugs or caps on the vent and drain lines?

To further secure the system from air leaks Signup and view all the answers

What should be done to the gauge glass gaskets when the expansion tank is isolated and drained?

They should be replaced with new ones Signup and view all the answers

What is the purpose of performing a chemical residual test in hot water heating systems?

To ensure the water has a residual of corrosion inhibitor Signup and view all the answers

What is the purpose of shot feeding water treatment chemicals into the system?

To provide additional treatment after equipment repair or replacement Signup and view all the answers

Why is internal water treatment required in hot water heating systems?

To prevent corrosion and scale formation Signup and view all the answers

Under what conditions are blowoff valves usually opened?

To drain boilers that require structural repair or waterside inspection Signup and view all the answers

MEDIUM What is the purpose of regular boiler checks?

To ensure the boiler functions safely and efficiently during unsupervised periods. Signup and view all the answers

What is the typical characteristic of a hot water boiler's operation?

It is fully automatic, with no need for operator intervention. Signup and view all the answers

What should be observed during daily routine procedures?

The burner flame, flame signal, and chimney conditions. Signup and view all the answers

What is the purpose of the programmed combustion control?

To sequence the operation of the burner and maintain safe and efficient burner operation. Signup and view all the answers

Why are daily routine procedures necessary?

To ensure the boiler operates safely and efficiently during unsupervised periods. Signup and view all the answers

What is the significance of observing the chimney condition?

To detect signs of smoking. Signup and view all the answers

What is an important aspect of routine boiler checks?

Monitoring the pump operation, make-up water supply, and water treatment. Signup and view all the answers

What is the implication of a white plume from the chimney?

The presence of water vapour from the combustion process. Signup and view all the answers

What could be a reason for a smoky flame?

Incorrect fuel-air ratio Signup and view all the answers

What should be done to correct high flue gas temperature?

Hire a certified burner technician Signup and view all the answers

Why is it essential to check the boiler discharge water temperature?

To prevent flue gas condensation Signup and view all the answers

What happens when heat transfer surfaces are fouled?

Flue gas temperature increases Signup and view all the answers

What is the minimum recommended differential between the safety relief valve set pressure and the boiler operating pressure?

69 kPa or 25% of the safety relief valve setting Signup and view all the answers

Why should the hot water supply set point not be below 75°C?

To prevent flue gas condensation Signup and view all the answers

What may cause a high flue gas temperature?

Poor combustion Signup and view all the answers

Why is it essential to regularly check the flue gas temperature?

To identify fouling of heating surfaces Signup and view all the answers

What is the maximum operating temperature for hot water heating boilers?

120°C Signup and view all the answers

Why is it essential to adjust the air-fuel ratio?

To ensure proper combustion Signup and view all the answers

What happens to a conventional air cushion expansion tank if it loses air?

It fills with water Signup and view all the answers

Why is it important to repair the cause of an air leak before returning the expansion tank to service?

To prevent the expansion tank from filling with water Signup and view all the answers

What is the purpose of opening the gauge glass drain when draining the expansion tank?

To drain the gauge glass Signup and view all the answers

Why is internal chemical treatment required in hot water heating systems?

To prevent corrosion and scale formation Signup and view all the answers

What is the purpose of performing a chemical residual test in hot water heating systems?

To ensure the water has a residual of corrosion inhibitor Signup and view all the answers

What is the purpose of shot feeding water treatment chemicals into the system?

To add treatment chemicals to the system Signup and view all the answers

Under what conditions are blowoff valves usually opened?

To drain the boiler for structural repair or waterside inspection Signup and view all the answers

Why is it important to restrict blowoff and blowdown in hot water heating boilers?

To reduce the amount of make-up required Signup and view all the answers

What may prevent the safety valve from opening at its set pressure?

Both a and b Signup and view all the answers

What is a common cause of water loss from a hot water heating system?

All of the above Signup and view all the answers

What is the purpose of installing a water meter in the make-up line?

To detect abnormal water make-up due to leakage Signup and view all the answers

What may happen if the upper part of the piping system runs dry?

Parts of the building will be cold Signup and view all the answers

What is the correct procedure to check the air charge in a bladder-style expansion tank?

Close the isolation valve, drain the water, and use a tire pressure gauge to read the tank pressure Signup and view all the answers

What is a sign of a damaged bladder in a bladder-style expansion tank?

Water issues forth with air when depressing the Schrader valve stem Signup and view all the answers

What may happen if the heating system is not properly filled with water?

The system will be prone to leaks and corrosion Signup and view all the answers

What is the purpose of an automatic feed valve in a hot water heating system?

To add make-up water automatically Signup and view all the answers

What may happen if the expansion tank is full and unable to accommodate the increase in water volume?

The safety valve will open and discharge water Signup and view all the answers

What is the result of unaddressed water losses in a hot water heating system?

Corrosive and scale-forming compounds will be introduced to the system Signup and view all the answers

HARD What is the primary function of the burner programmed combustion control sequences?

To sequence the operation of the burner, maintain safe and efficient burner operation, and shut down the boiler when an unsafe firing condition exists Signup and view all the answers

Why is it important to observe the chimney condition during daily routine procedures?

To check for any signs of smoking or white ash Signup and view all the answers

What is the significance of a white plume from the chimney?

It indicates the presence of water vapour from the combustion process Signup and view all the answers

What is the purpose of monitoring the pump operation and make-up water supply?

To ensure the boiler will function safely and efficiently during unsupervised periods Signup and view all the answers

Why are daily routine procedures necessary for hot water boilers?

To ensure the boiler will function safely and efficiently during unsupervised periods Signup and view all the answers

What is the typical characteristic of a hot water boiler's operation?

Fully automatic operation Signup and view all the answers

What is the implication of a smoky flame during burner operation?

It indicates a problem with the combustion process Signup and view all the answers

What is the purpose of regular boiler checks?

To ensure the boiler will function safely and efficiently during unsupervised periods Signup and view all the answers

What is the primary cause of air leaks in conventional air cushion expansion tanks?

Faulty gauge glass gaskets Signup and view all the answers

What is the purpose of opening the drain valve and vent valve when draining the expansion tank?

To remove water from the tank Signup and view all the answers

Why is it essential to use pipe plugs or caps on the vent and drain lines?

To secure the system from air leaks Signup and view all the answers

What is the recommended method for testing the water treatment chemical residual in hot water heating systems?

Drawing a water sample and performing a chemical residual test Signup and view all the answers

Why is internal chemical treatment required in hot water heating systems?

To prevent corrosion and scale formation Signup and view all the answers

What is the primary purpose of blowdown valves in hot water heating boilers?

To test low water cut-offs Signup and view all the answers

What is the consequence of not addressing air leaks in the expansion tank before returning it to service?

The tank will fill with water Signup and view all the answers

Why is it essential to use a pot feeder for shot feeding water treatment chemicals into the hot water heating system?

To ensure accurate dosing of chemicals Signup and view all the answers

What is the primary reason for a gradual increase in flue gas temperature?

Fouling of the heating surfaces due to waterside scale and sludge deposits Signup and view all the answers

What is the consequence of a boiler operating at a temperature above 120°C?

Damage to the boiler tubes Signup and view all the answers

What is the recommended procedure to correct excessive flue gas temperature due to too much excess air?

Perform a flue gas analysis and adjust the excess air to the manufacturer's specification Signup and view all the answers

What is the implication of a high flue gas temperature due to over-firing?

Potential furnace explosion Signup and view all the answers

What is the purpose of checking the combustion air intake to the boiler room?

To remove any obstructions and ensure proper combustion Signup and view all the answers

What is the consequence of waterside scale and sludge deposits on the heating surfaces?

Reduced boiler efficiency Signup and view all the answers

What is the recommended procedure to correct a smoky flame?

Hire a certified burner technician to perform combustion analysis Signup and view all the answers

What is the implication of a small rise in flue gas temperature?

Reduced boiler efficiency Signup and view all the answers

What is the purpose of checking the boiler operating pressure?

To ensure the safety relief valve stays tightly closed Signup and view all the answers

What is the consequence of heavy scale build-up on the heating surfaces?

Tube temperature rises above the safe limit, damaging the tubes Signup and view all the answers

What is the most likely cause of water losses in a hot water heating system if the expansion tank is full?

Increase in water volume when the boiler fires Signup and view all the answers

What is the consequence of a damaged bladder in a bladder-style expansion tank?

Water will issue forth with air when the Schrader valve stem is depressed Signup and view all the answers

What is the purpose of installing a water meter in the make-up line of a hot water heating system?

To detect abnormal water make-up due to leakage in piping and heat exchangers Signup and view all the answers

What is the consequence of not addressing water losses in a hot water heating system?

Water, heat, and chemical wastage will occur, and corrosive and scale-forming compounds will be introduced to the system Signup and view all the answers

What is the correct procedure to check the air charge in a bladder-style expansion tank?

Drain the water from the tank, isolate the tank, and then use a tire pressure gauge to read the tank pressure Signup and view all the answers

What is the purpose of regular checks on the heating system?

To detect leaks in the system and prevent water losses Signup and view all the answers

What is the consequence of a full expansion tank in a hot water heating system?

The safety valve may open and discharge water, causing water losses Signup and view all the answers

Why is it essential to regularly check the expansion tank?

To ensure the tank has adequate room for expansion and prevent water, heat, and chemical wastage Signup and view all the answers

What is the purpose of an automatic feed valve in a hot water heating system?

To add make-up water to the system when necessary Signup and view all the answers

What may happen if the upper part of the piping system runs dry in a hot water heating system?

Parts of the building will be cold Signup and view all the answers

Study Notes

Routine Operation Procedures

Daily routine checks are crucial to ensure the safe operation of hot water boilers, including observing the burner flame, checking the chimney, and monitoring combustion air intake.

Burner Operation

Observe the burner flame to ensure it is bright and symmetrical, with a blue color for natural gas and bright yellow for light fuel oil.
Check the flame signal on the flame scanner or programmed combustion control.
Check the chimney for signs of smoking, which may indicate a problem with the fuel-air ratio or burner nozzle.

Flue Gas Temperature

Check the flue gas temperature regularly to ensure efficient heat transfer between the flue gases and boiler water.
A gradual increase in temperature may indicate fouling of the heating surfaces, while an excessive temperature rise may indicate serious trouble.

Boiler Water Temperature

Check that the boiler discharge water temperature is at or near the hot water supply set point.
Ensure the operating temperature is not higher than necessary for adequate building heat.
Prevent corrosion by keeping the hot water set point above 75°C, unless the boiler is a condensing type.

Boiler Pressure

Ensure the operating pressure of low-pressure hot water heating boilers is within safe limits, taking into account the safety relief valve set pressure.

Water Losses and Make-Up Water Supply

Regularly check for water losses, which may be due to leaking piping, valves, or the boiler itself.
Use an automatic feed valve to add make-up water, and consider installing a water meter to detect leaks.

Expansion Tanks

Check expansion tanks regularly to ensure they have adequate room for expansion.
Check air charge, and adjust as necessary to prevent water, heat, and chemical wastage.

Bladder-Style Expansion Tanks

Check the air charge of bladder-style expansion tanks by isolating the tank, draining the water, and using a tire pressure gauge.
Adjust the air pressure as necessary, and replace the bladder if damaged.

Conventional Air Cushion Expansion Tanks

Check for air leaks in conventional air cushion expansion tanks, and repair or replace fittings as necessary.
Drain and refill the tank as necessary to prevent water accumulation.

Water Treatment

Hot water heating systems require internal chemical treatment to prevent corrosion and scale formation.
Regularly test the water for residual corrosion inhibitor, and shot feed treatment chemicals as necessary.

Blowoff and Blowdown

Restrict blowoff and blowdown to minimize the need for internal water treatment and reduce the amount of make-up required.

Routine Operation Procedures

Daily routine checks are crucial to ensure the safe operation of hot water boilers, including observing the burner flame, checking the chimney, and monitoring combustion air intake.

Burner Operation

Observe the burner flame to ensure it is bright and symmetrical, with a blue color for natural gas and bright yellow for light fuel oil.
Check the flame signal on the flame scanner or programmed combustion control.
Check the chimney for signs of smoking, which may indicate a problem with the fuel-air ratio or burner nozzle.

Flue Gas Temperature

Check the flue gas temperature regularly to ensure efficient heat transfer between the flue gases and boiler water.
A gradual increase in temperature may indicate fouling of the heating surfaces, while an excessive temperature rise may indicate serious trouble.

Boiler Water Temperature

Check that the boiler discharge water temperature is at or near the hot water supply set point.
Ensure the operating temperature is not higher than necessary for adequate building heat.
Prevent corrosion by keeping the hot water set point above 75°C, unless the boiler is a condensing type.

Boiler Pressure

Ensure the operating pressure of low-pressure hot water heating boilers is within safe limits, taking into account the safety relief valve set pressure.

Water Losses and Make-Up Water Supply

Regularly check for water losses, which may be due to leaking piping, valves, or the boiler itself.
Use an automatic feed valve to add make-up water, and consider installing a water meter to detect leaks.

Expansion Tanks

Check expansion tanks regularly to ensure they have adequate room for expansion.
Check air charge, and adjust as necessary to prevent water, heat, and chemical wastage.

Bladder-Style Expansion Tanks

Check the air charge of bladder-style expansion tanks by isolating the tank, draining the water, and using a tire pressure gauge.
Adjust the air pressure as necessary, and replace the bladder if damaged.

Conventional Air Cushion Expansion Tanks

Check for air leaks in conventional air cushion expansion tanks, and repair or replace fittings as necessary.
Drain and refill the tank as necessary to prevent water accumulation.

Water Treatment

Hot water heating systems require internal chemical treatment to prevent corrosion and scale formation.
Regularly test the water for residual corrosion inhibitor, and shot feed treatment chemicals as necessary.

Blowoff and Blowdown

Restrict blowoff and blowdown to minimize the need for internal water treatment and reduce the amount of make-up required.

Routine Operation Procedures

Daily routine checks are crucial to ensure the safe operation of hot water boilers, including observing the burner flame, checking the chimney, and monitoring combustion air intake.

Burner Operation

Observe the burner flame to ensure it is bright and symmetrical, with a blue color for natural gas and bright yellow for light fuel oil.
Check the flame signal on the flame scanner or programmed combustion control.
Check the chimney for signs of smoking, which may indicate a problem with the fuel-air ratio or burner nozzle.

Flue Gas Temperature

Check the flue gas temperature regularly to ensure efficient heat transfer between the flue gases and boiler water.
A gradual increase in temperature may indicate fouling of the heating surfaces, while an excessive temperature rise may indicate serious trouble.

Boiler Water Temperature

Check that the boiler discharge water temperature is at or near the hot water supply set point.
Ensure the operating temperature is not higher than necessary for adequate building heat.
Prevent corrosion by keeping the hot water set point above 75°C, unless the boiler is a condensing type.

Boiler Pressure

Ensure the operating pressure of low-pressure hot water heating boilers is within safe limits, taking into account the safety relief valve set pressure.

Water Losses and Make-Up Water Supply

Regularly check for water losses, which may be due to leaking piping, valves, or the boiler itself.
Use an automatic feed valve to add make-up water, and consider installing a water meter to detect leaks.

Expansion Tanks

Check expansion tanks regularly to ensure they have adequate room for expansion.
Check air charge, and adjust as necessary to prevent water, heat, and chemical wastage.

Bladder-Style Expansion Tanks

Check the air charge of bladder-style expansion tanks by isolating the tank, draining the water, and using a tire pressure gauge.
Adjust the air pressure as necessary, and replace the bladder if damaged.

Conventional Air Cushion Expansion Tanks

Check for air leaks in conventional air cushion expansion tanks, and repair or replace fittings as necessary.
Drain and refill the tank as necessary to prevent water accumulation.

Water Treatment

Hot water heating systems require internal chemical treatment to prevent corrosion and scale formation.
Regularly test the water for residual corrosion inhibitor, and shot feed treatment chemicals as necessary.

Blowoff and Blowdown

Restrict blowoff and blowdown to minimize the need for internal water treatment and reduce the amount of make-up required.

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Description

This quiz covers the essential checks and monitoring required for hot water heating boilers to function safely and efficiently during unsupervised periods.

4BE3.5 U4 C3 Obj 1 EMH

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Podcast

Questions and Answers

EASY What is the primary reason for regular checks of hot water heating boilers?

What is the primary function of the programmed combustion control?

What is the recommended colour of the burner flame when burning natural gas?

What does a white plume from the chimney indicate?

What is the purpose of monitoring the stack temperature?

What is the purpose of the daily routine procedures?

What should the burner flame signal on the flame scanner or programmed combustion control indicate?

What is the recommended colour of the burner flame when burning light fuel oil?

What is a common cause of a smoky flame?

Why is it important to regularly check the flue gas temperature?

What is the result of a gradual increase in flue gas temperature?

What is a possible cause of high flue gas temperature?

Why should the hot water supply set point not be below 75°C?

What is the maximum operating temperature for hot water heating boilers?

What is the recommended minimum differential between the safety relief valve set pressure and the boiler operating pressure?

What is the purpose of checking the boiler discharge water temperature?

What is a possible cause of a high flue gas temperature?

Why should the high temperature cut-off be set to below 120°C?

What may happen if solid deposits form on the safety valve seats?

Why is it essential to regularly check that the heating system is completely filled with water?

What may cause water losses in a hot water heating system?

What is the purpose of an automatic feed valve in a hot water heating system?

What may happen if the expansion tank is full and unable to accommodate the increase in water volume?

Why should the expansion tank be regularly checked?

What is the correct procedure to check the air charge in a bladder-style expansion tank?

What may be a sign of a damaged bladder in a bladder-style expansion tank?

Why is it recommended to install a water meter in the make-up line?

What may happen if water losses are left unaddressed in a hot water heating system?

Why is it important to determine and repair the cause of an air leak before returning the expansion tank from service?

What is the purpose of shutting the valve to the boiler or heating system when draining the expansion tank?

What is the purpose of using pipe plugs or caps on the vent and drain lines?

What should be done to the gauge glass gaskets when the expansion tank is isolated and drained?

What is the purpose of performing a chemical residual test in hot water heating systems?

What is the purpose of shot feeding water treatment chemicals into the system?

Why is internal water treatment required in hot water heating systems?

Under what conditions are blowoff valves usually opened?

MEDIUM What is the purpose of regular boiler checks?

What is the typical characteristic of a hot water boiler's operation?

What should be observed during daily routine procedures?

What is the purpose of the programmed combustion control?

Why are daily routine procedures necessary?

What is the significance of observing the chimney condition?

What is an important aspect of routine boiler checks?

What is the implication of a white plume from the chimney?

What could be a reason for a smoky flame?

What should be done to correct high flue gas temperature?

Why is it essential to check the boiler discharge water temperature?

What happens when heat transfer surfaces are fouled?

What is the minimum recommended differential between the safety relief valve set pressure and the boiler operating pressure?

Why should the hot water supply set point not be below 75°C?

What may cause a high flue gas temperature?

Why is it essential to regularly check the flue gas temperature?

What is the maximum operating temperature for hot water heating boilers?

Why is it essential to adjust the air-fuel ratio?

What happens to a conventional air cushion expansion tank if it loses air?

Why is it important to repair the cause of an air leak before returning the expansion tank to service?

What is the purpose of opening the gauge glass drain when draining the expansion tank?

Why is internal chemical treatment required in hot water heating systems?

What is the purpose of performing a chemical residual test in hot water heating systems?

What is the purpose of shot feeding water treatment chemicals into the system?

Under what conditions are blowoff valves usually opened?

Why is it important to restrict blowoff and blowdown in hot water heating boilers?

What may prevent the safety valve from opening at its set pressure?

What is a common cause of water loss from a hot water heating system?

What is the purpose of installing a water meter in the make-up line?

What may happen if the upper part of the piping system runs dry?

What is the correct procedure to check the air charge in a bladder-style expansion tank?

What is a sign of a damaged bladder in a bladder-style expansion tank?

What may happen if the heating system is not properly filled with water?

What is the purpose of an automatic feed valve in a hot water heating system?

What may happen if the expansion tank is full and unable to accommodate the increase in water volume?

What is the result of unaddressed water losses in a hot water heating system?

HARD What is the primary function of the burner programmed combustion control sequences?

Why is it important to observe the chimney condition during daily routine procedures?

What is the significance of a white plume from the chimney?

What is the purpose of monitoring the pump operation and make-up water supply?