Podcast
Questions and Answers
Combination boilers are designed to:
Combination boilers are designed to:
- Provide domestic hot water and hot water heating (correct)
- Provide hot water from a storage cylinder and hot water heating
- Work with two different fuels at the same time
- Provide heating only through any type of heat emitter
Which of the following heating components may have a replaceable gland packing?
Which of the following heating components may have a replaceable gland packing?
- Central heating pump
- Automatic air release
- Zone valve
- Thermostatic radiator valve (correct)
Which one of the following is regarded as best practice when branching a large new radiator circuit into an existing heating circuit in cold weather?
Which one of the following is regarded as best practice when branching a large new radiator circuit into an existing heating circuit in cold weather?
- Install the radiators, branch into the pipework and install the new pipework
- Branch into the pipework before fitting the radiators
- Drain the system down as the first action
- Install the new radiators and pipework runs before branching in (correct)
When fully draining down a heating system:
When fully draining down a heating system:
Which one of the following could be fitted in the pipeline to prevent unwanted circulation in heating system pipework?
Which one of the following could be fitted in the pipeline to prevent unwanted circulation in heating system pipework?
A dwelling with steel panel radiators controlled by thermostatic valves is being decorated. The radiators will be removed one at a time as the heating is to be kept on during the work. Which one of the following precautions should be taken before removing the radiators?
A dwelling with steel panel radiators controlled by thermostatic valves is being decorated. The radiators will be removed one at a time as the heating is to be kept on during the work. Which one of the following precautions should be taken before removing the radiators?
A pump on a central heating system has been renewed on a number of occasions. Which one of the following could be causing the fault?
A pump on a central heating system has been renewed on a number of occasions. Which one of the following could be causing the fault?
The downstairs radiators in a heating system are failing to warm up, whilst the upstairs radiators and hot water system are only lukewarm. This is most likely to be caused by a faulty:
The downstairs radiators in a heating system are failing to warm up, whilst the upstairs radiators and hot water system are only lukewarm. This is most likely to be caused by a faulty:
The statutory requirements for space heating systems controls are covered by:
The statutory requirements for space heating systems controls are covered by:
The safety risk to customers when carrying out rectification work on central heating systems can be minimised by ensuring that:
The safety risk to customers when carrying out rectification work on central heating systems can be minimised by ensuring that:
During maintenance procedures, in addition to turning off the electrical supply to any electrically operated components at the consumer unit, which one of the following safety actions should be taken as part of the safe isolation procedure?
During maintenance procedures, in addition to turning off the electrical supply to any electrically operated components at the consumer unit, which one of the following safety actions should be taken as part of the safe isolation procedure?
Wiring diagrams for a fully pumped system can be found in the:
Wiring diagrams for a fully pumped system can be found in the:
The main advantage of a one pipe system compared to a two pipe system, is that it:
The main advantage of a one pipe system compared to a two pipe system, is that it:
The cold water supply to a fully pumped open vented central heating system should be isolated at the:
The cold water supply to a fully pumped open vented central heating system should be isolated at the:
A boiler requiring a greater flow through its' heat exchanger than the heating and hot water circuits require, should be fitted with:
A boiler requiring a greater flow through its' heat exchanger than the heating and hot water circuits require, should be fitted with:
The minimum size of vent pipe from the primary flow on a pumped central heating system using gravity primaries is:
The minimum size of vent pipe from the primary flow on a pumped central heating system using gravity primaries is:
When positioning a single room thermostat, its' recommended height from ground level is:
When positioning a single room thermostat, its' recommended height from ground level is:
The air supply to the fire bed of a standard solid fuel room heater is usually controlled by a:
The air supply to the fire bed of a standard solid fuel room heater is usually controlled by a:
Which one of the following gas boilers overcomes the need for a cold water storage cistern, feed and expansion cistern and hot water storage vessel?
Which one of the following gas boilers overcomes the need for a cold water storage cistern, feed and expansion cistern and hot water storage vessel?
The primary vent pipe on a central heating system should always discharge over the:
The primary vent pipe on a central heating system should always discharge over the:
The main reason for allowing adequate space between the top of a radiator and an overhanging window sill is to:
The main reason for allowing adequate space between the top of a radiator and an overhanging window sill is to:
When setting the water level in a feed and expansion cistern, the allowance that should be made for expansion of water in the heating system is:
When setting the water level in a feed and expansion cistern, the allowance that should be made for expansion of water in the heating system is:
On an open vented heating system, positioning the pump between the cold feed and vent would:
On an open vented heating system, positioning the pump between the cold feed and vent would:
If TRV's or zone valves on a system close, the purpose of the automatic by-pass valve is to make sure that:
If TRV's or zone valves on a system close, the purpose of the automatic by-pass valve is to make sure that:
One purpose of the primary open vent on a central heating system is to:
One purpose of the primary open vent on a central heating system is to:
Before filling hot water and heating system pipework prior to testing, it is good practice to first remove the pump to prevent any:
Before filling hot water and heating system pipework prior to testing, it is good practice to first remove the pump to prevent any:
The recommended test pressure for a hydraulic test on a central heating system is:
The recommended test pressure for a hydraulic test on a central heating system is:
It can be confirmed that an existing installation is a one pipe system by checking that:
It can be confirmed that an existing installation is a one pipe system by checking that:
The most efficient way of draining a single radiator when removing it from the first floor of a dwelling is to:
The most efficient way of draining a single radiator when removing it from the first floor of a dwelling is to:
The safest method of ensuring that a central heating pump cannot be re-activated during a period of decommissioning, is to:
The safest method of ensuring that a central heating pump cannot be re-activated during a period of decommissioning, is to:
Flashcards
Combination Boilers Design
Combination Boilers Design
Combination boilers provide domestic hot water and hot water heating without the need for separate tanks.
Heating Component with Replaceable Gland Packing
Heating Component with Replaceable Gland Packing
A central heating pump component that may require replaceable gland packing to prevent leaks.
Best Practice for Branching Radiator Circuit
Best Practice for Branching Radiator Circuit
Best practice is to install new radiators and pipework runs before branching into an existing heating circuit in cold weather.
Draining a Heating System
Draining a Heating System
When fully draining down a heating system, the air vents should be opened to allow air to enter and water to drain.
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Preventing Unwanted Circulation
Preventing Unwanted Circulation
In heating systems, an anti-gravity valve can be installed in the pipeline to prevent unwanted circulation.
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Precautions Before Removing Radiators
Precautions Before Removing Radiators
When removing radiators, remove the thermostatic radiator valve head and secure the pressure pin with a retaining cap.
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Cause of Pump Faults
Cause of Pump Faults
A central heating system pump faults can be caused by it having no system bypass when fitted with thermostatic radiator valves.
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Cause of Uneven Heating
Cause of Uneven Heating
Downstairs radiators failing to warm up while upstairs radiators and hot water are lukewarm is often caused by a faulty pump.
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Space Heating Systems Regulations
Space Heating Systems Regulations
Statutory requirements for space heating are covered by The Building Regulations.
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Minimizing Safety Risks
Minimizing Safety Risks
Minimizing safety risks during central heating rectification involves ensuring all appropriate temporary earth continuity bonding has been applied.
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Safe Isolation Procedure
Safe Isolation Procedure
During maintenance, lock off the MCB and put a warning notice on the consumer unit for safe isolation.
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Wiring Diagrams Location
Wiring Diagrams Location
Wiring diagrams for a fully pumped system are found in the Manufacturer's instructions.
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Advantage of One Pipe System
Advantage of One Pipe System
The main advantage of a one pipe system is that it Is generally quicker to install.
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Isolating Cold Water Supply
Isolating Cold Water Supply
The cold water supply to a fully pumped open vented central heating system should be isolated at the Service valve to the float operated valve to the F&E cistern.
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Greater Flow Through Heat Exchanger
Greater Flow Through Heat Exchanger
A boiler requiring a greater flow through its' heat exchanger should be fitted with An automatic bypass valve.
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Minimum Vent Pipe Size
Minimum Vent Pipe Size
The minimum size of vent pipe from the primary flow on a pumped central heating system using gravity primaries is 22mm.
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Thermostat Height
Thermostat Height
When positioning a single room thermostat, the recommended height from the ground is 1.5m.
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Air Supply Control
Air Supply Control
The air supply to the fire bed of a standard solid fuel room heater is controlled by a Draught stabiliser.
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Boiler Type Eliminating Cisterns
Boiler Type Eliminating Cisterns
A combination gas boiler overcomes the need for a cold water storage cistern, feed and expansion cistern, and hot water storage vessel.
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Primary Vent Termination
Primary Vent Termination
The primary vent pipe on a central heating system should always discharge over the Feed and expansion cistern.
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Radiator Space Under Sill
Radiator Space Under Sill
Allow adequate space between the radiator and window sill to Provide adequate clearance for heat circulation.
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Expansion Allowance in Cistern
Expansion Allowance in Cistern
When setting the water level in a feed and expansion cistern, allow 4% for expansion of water in the heating system.
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Pump Placement Issue
Pump Placement Issue
Positioning the pump between the cold feed and vent would Result in water pumping over the vent to the F&E cistern.
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Automatic Bypass Valve Purpose
Automatic Bypass Valve Purpose
If TRV's or zone valves close, the purpose of the automatic by-pass valve is to make sure that Water can flow through the boiler.
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Purpose of Open Vent
Purpose of Open Vent
One purpose of the primary open vent on a central heating system is to Ensure that the system is kept at atmospheric pressure.
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Pump Removal Rationale
Pump Removal Rationale
Before filling hot water and heating system pipework, remove the pump to prevent System debris entering the pumps' workings.
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Test Pressure
Test Pressure
The recommended test pressure is 1.5 times normal working pressure.
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One Pipe System
One Pipe System
An existing installation is a one pipe system if There is no return heating pipework to the boiler.
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Draining a Radiator
Draining a Radiator
Isolate the valves and drain down the radiator.
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Ensure Safe Pump Isolation
Ensure Safe Pump Isolation
Switch off the supply to the pump at the fused spur outlet, remove the fuse and check for safe isolation
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Combination Boilers
- Combination boilers are designed to provide both domestic hot water and hot water heating.
Heating Components
- Central heating pumps may have replaceable gland packing.
Radiator Circuit Best Practices
- Best practice when branching a new radiator circuit into an existing heating circuit during cold weather is to install the new radiators and pipework runs before branching in.
Draining a Heating System
- Radiator valves should be closed and air vents should be opened when fully draining a heating system.
Preventing Unwanted Circulation
- An anti-gravity valve can be fitted in the pipeline to prevent unwanted circulation in heating system pipework.
Removing Radiators for Decoration
- When removing steel panel radiators with thermostatic valves for decorating while keeping the heating on, remove the head on the thermostatic rad.valve and secure the pressure pin with a retaining cap.
Central Heating Pump Renewal Issues
- Repeated renewal of a central heating system pump could be due to no system bypass when fitted with thermostatic radiator valves.
Heating System Faults
- Downstairs radiators failing to warm up while upstairs radiators and the hot water system are lukewarm is most likely caused by a faulty pump.
Space Heating Systems Controls
- The Building regulations cover the statutory requirements for space heating systems controls.
Minimising Safety Risks
- Ensuring that all appropriate temporary earth continuity bonding has been applied minimises the safety risk to customers when carrying out rectification work on central heating systems.
Safe Isolation Procedure
- Lock off the MCB and provide a warning notice on the consumer unit in addition to turning off the electrical supply to any electrically operated components at the consumer unit, which one of the following safety actions should be taken as part of the safe isolation procedure.
Wiring Diagrams
- Wiring diagrams for a fully pumped system can be found in the manufacturer's instructions.
One Pipe System Advantage
- A one pipe system, compared to a two pipe system, is generally quicker to install.
Isolating Cold Water Supply
- The cold water supply to a fully pumped open vented central heating system should be isolated at the service valve to the float operated valve to the F&E cistern.
Boiler Flow Requirements
- A boiler requiring a greater flow through its' heat exchanger than the heating and hot water circuits require, should be fitted with an automatic bypass valve.
Vent Pipe Size
- The minimum size of vent pipe from the primary flow on a pumped central heating system using gravity primaries is 22mm.
Room Thermostat Height
- The recommended height for positioning a single room thermostat from ground level is 1.5m.
Solid Fuel Heater Air Supply
- A draught stabilizer usually controls the air supply to the fire bed of a standard solid fuel room heater.
Gas Boilers
- A combination gas boiler overcomes the need for a cold water storage cistern, feed and expansion cistern, and hot water storage vessel.
Primary Vent Pipe
- The primary vent pipe on a central heating system should always discharge over the feed and expansion cistern.
Radiator Space
- The main reason for allowing adequate space between the top of a radiator and an overhanging window sill is to provide adequate clearance for heat circulation.
Feed and Expansion Cistern Water Level
- When setting the water level in a feed and expansion cistern, the allowance that should be made for expansion of water in the heating system is 4%.
Open Vented Heating Systems
- Positioning the pump between the cold feed and vent on an open vented heating system would result in water pumping over the vent to the F&E cistern.
Automatic By-Pass Valve Purpose
- If TRV's or zone valves on a system close, the purpose of the automatic by-pass valve is to make sure that water can flow through the boiler.
Primary Open Vent Purpose
- One purpose of the primary open vent on a central heating system is to ensure that the system is kept at atmospheric pressure.
Removing Pump Before Testing
- Before filling hot water and heating system pipework prior to testing, it is good practice to first remove the pump to prevent system debris entering the pumps' workings.
Hydraulic Test Pressure
- The recommended test pressure for a hydraulic test on a central heating system is 1.5 times normal working pressure.
One Pipe System Confirmation
- It can be confirmed that an existing installation is a one pipe system by checking that the main flow and return pipe is in the form of a loop to and from the boiler.
Draining a Radiator
- The most efficient way of draining a single radiator when removing it from the first floor of a dwelling is to isolate the valves and drain down the radiator.
Decommissioning a Central Heating Pump
- The safest method of ensuring that a central heating pump cannot be re-activated during a period of decommissioning, is to isolate the pump from the electrical supply by turning off all the power at the mains, disconnect the pump and tape the wires up.
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