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Questions and Answers
In a two pipe system the
In a two pipe system the
- flow and return pipework are separated (correct)
- flow and return pipework are mixed
- return water temperature is higher than the flow water.
- return water is at the same temperature as the flow water
Which of the following systems does the statement apply to?
'The temperature of the last radiator on the circuit will be cooler than the first radiator.'
Which of the following systems does the statement apply to? 'The temperature of the last radiator on the circuit will be cooler than the first radiator.'
- Microbore system.
- One pipe system. (correct)
- Two pipe reverse return system.
- Two pipe system.
The minimum pipe size for the primary flow and return pipework from an independent solid fuel boiler, to a hot water storage cylinder, is
The minimum pipe size for the primary flow and return pipework from an independent solid fuel boiler, to a hot water storage cylinder, is
- 15 mm
- 28 mm (correct)
- 35 mm.
- 22 mm
What is the normal size of an open vent pipe to a fully pumped heating system, in a domestic property?
What is the normal size of an open vent pipe to a fully pumped heating system, in a domestic property?
The connection of an open vent pipe and a cold feed pipe, can be made to a fully pumped system using
The connection of an open vent pipe and a cold feed pipe, can be made to a fully pumped system using
A zone valve in a pumped heating circuit is designed to
A zone valve in a pumped heating circuit is designed to
The main purpose of the vent pipe installed on a heating circuit is to
The main purpose of the vent pipe installed on a heating circuit is to
Refer to Figure 1. Which one of the following components is indicated by the British Standard symbol shown?
Refer to Figure 1. Which one of the following components is indicated by the British Standard symbol shown?
With reference to hot water heating, an injector tee would be used where
With reference to hot water heating, an injector tee would be used where
A mid position diverter valve
A mid position diverter valve
When fitting thermostatic radiator valves, a general principle to follow is that
When fitting thermostatic radiator valves, a general principle to follow is that
Which one of the following can be fitted with a remote sensor?
Which one of the following can be fitted with a remote sensor?
An anti-gravity valve would be fitted in a
An anti-gravity valve would be fitted in a
Which one of the following components would be strapped to a hot water storage cylinder?
Which one of the following components would be strapped to a hot water storage cylinder?
In an indirect system of heating and hot water, which includes a cold water storage cistern and a feed and expansion cistern
In an indirect system of heating and hot water, which includes a cold water storage cistern and a feed and expansion cistern
In a combined hot water and central heating system, including a feed and expansion cistern with gravity primaries and pumped heating circuits, the
In a combined hot water and central heating system, including a feed and expansion cistern with gravity primaries and pumped heating circuits, the
The minimum size of primary cold feed pipe for a hot water heating system is
The minimum size of primary cold feed pipe for a hot water heating system is
Before filling a central heating system for the first time, it is advisable to
Before filling a central heating system for the first time, it is advisable to
Which one of the following assists in the removal of flux from heating systems pipework?
Which one of the following assists in the removal of flux from heating systems pipework?
Combination boilers are designed to
Combination boilers are designed to
Which of the following is regarded as best practice when branching a large new radiator circuit into an existing heating circuit in cold weather?
Which of the following is regarded as best practice when branching a large new radiator circuit into an existing heating circuit in cold weather?
When fully draining down a heating system
When fully draining down a heating system
A dwelling installed 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 installed 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?
Which one of the following heating components may have a replaceable gland packing?
Which one of the following heating components may have a replaceable gland packing?
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?
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?
The downstairs radiators in a heating system are failing to warm up, whilst the upstairs radiators and the 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 the hot water system are only lukewarm. This is most likely to be caused by a faulty
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?
Refer to Figure 2.
Refer to Figure 2.
Flashcards
Two-pipe system
Two-pipe system
In a two-pipe system, flow and return pipework are separate.
One pipe system
One pipe system
A system where the last radiator is cooler than the first.
Minimum Pipe Size
Minimum Pipe Size
Minimum pipe size is 28 mm for primary flow and return from a solid fuel boiler to a hot water cylinder.
Open Vent Pipe Size
Open Vent Pipe Size
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Open Vent/Cold Feed Connection
Open Vent/Cold Feed Connection
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Zone valve function
Zone valve function
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Vent pipe purpose
Vent pipe purpose
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Figure 1 Component
Figure 1 Component
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Figure 2 Component
Figure 2 Component
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Injector Tee Use
Injector Tee Use
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Mid position diverter valve
Mid position diverter valve
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TRV Fitting Principle
TRV Fitting Principle
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Component with remote sensor
Component with remote sensor
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Anti-gravity valve location
Anti-gravity valve location
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Component strapped to cylinder
Component strapped to cylinder
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Indirect system water levels
Indirect system water levels
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Feed/Expansion Cistern
Feed/Expansion Cistern
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Minimum primary cold feed
Minimum primary cold feed
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Filling System First Time
Filling System First Time
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Remove Flux
Remove Flux
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Study Notes
- In a two-pipe system, the flow and return pipework are separated.
- The statement "The temperature of the last radiator on the circuit will be cooler than the first radiator" applies to a one-pipe system.
- The minimum pipe size for the primary flow and return pipework from an independent solid fuel boiler to a hot water storage cylinder is 28 mm.
- The normal size of an open vent pipe to a fully pumped heating system in a domestic property is 22 mm.
- The connection of an open vent pipe and a cold feed pipe can be made to a fully pumped system using an injector tee.
- A zone valve in a pumped heating circuit is designed to isolate the circuit when the desired temperature is reached.
- The main purpose of the vent pipe installed on a heating circuit is to protect the system in the event of over-heating.
- Figure 1 shows a double check valve assembly.
- Figure 2 shows a drain off valve.
- With reference to hot water heating, an injector tee would be used where a return pipe from a gravity-fed cylinder and a return pipe from a pumped heating circuit are combined.
- A mid-position diverter valve provides priority circulation to the hot water circuit.
- When fitting thermostatic radiator valves, a general principle to follow is that at least one radiator should be fitted without a thermostatic radiator valve.
- A thermostatic radiator valve can be fitted with a remote sensor.
- An anti-gravity valve would be fitted in a pipeline in which unwanted circulation was occurring.
- A thermostat would be strapped to a hot water storage cylinder.
- In an indirect system of heating and hot water, which includes a cold water storage cistern and a feed and expansion cistern, the water level in the feed and expansion cistern should be below that of the cold water storage cistern.
- In a combined hot water and central heating system, including a feed and expansion cistern with gravity primaries and pumped heating circuits, the water level in the feed and expansion cistern should be set to allow sufficient room for thermal expansion.
- The minimum size of the primary cold feed pipe for a hot water heating system is 15 mm.
- Before filling a central heating system for the first time, it is advisable to remove the pump (accelerator) and replace it with a piece of temporary piping.
- Hot flushing a system is one of the following that assists in the removal of flux from heating systems pipework as part of the commissioning process.
- Combination boilers are designed to provide domestic hot water and hot water heating.
- When branching a large new radiator circuit into an existing heating circuit in cold weather, the best practice is to drain the system down as the first action.
- When fully draining down a heating system, the air vents should be opened.
- When a dwelling installed with steel panel radiators controlled by thermostatic valves is being decorated and the radiators are to be removed, remove the head on the thermostatic radiator valve and secure the pressure pin with a retaining cap before removing the radiators.
- A zone valve is one of the following heating components that may have a replaceable gland packing.
- No system bypass when fitted with thermostatic radiator valves possibly causes a pump on a central heating system being renewed on a number of occasions.
- An anti-gravity valve could be fitted in the pipeline to prevent unwanted circulation in heating system pipework.
- A faulty pump is most likely to cause downstairs radiators in a heating system to fail to warm up, whilst the upstairs radiators and the hot water system are only lukewarm.
- The safety risk to customers when carrying out rectification work on central heating systems can be minimised by ensuring that all appropriate temporary earth continuity bonding has been applied.
- During maintenance procedures, in addition to turning off the electrical supply to any electrically operated components at the consumer unit, lock off the MCB and provide a warning notice on the consumer unit as part of the safe isolation procedure.
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