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Questions and Answers
Which British standard includes detail on the requirements for installing open vented central heating systems?
Which British standard includes detail on the requirements for installing open vented central heating systems?
- B.S EN 12976
- B.S.EN 12056
- B.S 5449 (correct)
- B.S 6700
What is the recommended actual capacity of a feed and expansion cistern for use in a small domestic property?
What is the recommended actual capacity of a feed and expansion cistern for use in a small domestic property?
- 58 Litres
- 18 Litres (correct)
- 4 Litres
- 12 Litres
Which one of the following should be carried out before adding corrosion inhibitor to a new central heating system?
Which one of the following should be carried out before adding corrosion inhibitor to a new central heating system?
- Hot Flushing of the system contents to remove flux residue (correct)
- Charging the system with a nitrogen/air mix
- Treating the water with sodium hypochlorite
- Disinfection of the system contents to protect from legionella
What is the maximum recommended clip distance for a 15mm vertical copper pipe?
What is the maximum recommended clip distance for a 15mm vertical copper pipe?
A central heating system which includes a single feed indirect cylinder is supplied with water from the:
A central heating system which includes a single feed indirect cylinder is supplied with water from the:
Connections to radiators in domestic properties are usually made:
Connections to radiators in domestic properties are usually made:
To what height should the open vent pipe rise above the water level in an open vented fully pumped heating system?
To what height should the open vent pipe rise above the water level in an open vented fully pumped heating system?
In which one of the following locations is it normally a requirement to insulate central heating pipework?
In which one of the following locations is it normally a requirement to insulate central heating pipework?
Before turning off the central heating system in a private house in order to carry out maintenance work, which one of the following should be informed?
Before turning off the central heating system in a private house in order to carry out maintenance work, which one of the following should be informed?
The "neutral point" in a central heating system refers to:
The "neutral point" in a central heating system refers to:
Which one of the following could be the cause of a loud whistling noise from the thermostatic radiator valves in a central heating system?
Which one of the following could be the cause of a loud whistling noise from the thermostatic radiator valves in a central heating system?
In a central heating system fitted with thermostatic radiator valves, which one of the following components is used to ensure that there is sufficient flow rate through the boiler when the TRV's begin to turn off?
In a central heating system fitted with thermostatic radiator valves, which one of the following components is used to ensure that there is sufficient flow rate through the boiler when the TRV's begin to turn off?
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?
A dwelling with 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 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?
When fully draining down a heating system,
When fully draining down a heating system,
Combination boilers are designed to:
Combination boilers are designed to:
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?
The minimum size for a primary cold feed for a hot water heating system is:
The minimum size for a primary cold feed for a hot water heating system is:
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 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:
Flashcards
Open Vented System Standard
Open Vented System Standard
B.S 6700 provides details on requirements for installing open vented central heating systems.
Feed and Expansion Cistern Capacity
Feed and Expansion Cistern Capacity
The recommended actual capacity is 18 Litres.
Pre-Inhibitor System Prep
Pre-Inhibitor System Prep
Hot flushing removes flux residue before adding corrosion inhibitor.
15mm Vertical Copper Pipe Clip Distance
15mm Vertical Copper Pipe Clip Distance
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Single Feed Water Source
Single Feed Water Source
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Open Vent Pipe Height
Open Vent Pipe Height
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Pipework Insulation
Pipework Insulation
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Pre-Maintenance Communication
Pre-Maintenance Communication
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Neutral Point Definition
Neutral Point Definition
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Whistling Noise Cause
Whistling Noise Cause
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Bypass Valve Function
Bypass Valve Function
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Repeated Pump Renewal Cause
Repeated Pump Renewal Cause
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Radiator Removal Precaution
Radiator Removal Precaution
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Draining System Vent
Draining System Vent
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Combination Boiler Function
Combination Boiler Function
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Radiator Circuit Branching Practice
Radiator Circuit Branching Practice
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Minimum Cold Feed
Minimum Cold Feed
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F&E Cistern Water Level
F&E Cistern Water Level
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Open Vent/Cold Feed Connection
Open Vent/Cold Feed Connection
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Study Notes
- B.S 5449 includes details on installing open vented central heating systems.
- The recommended actual capacity of a feed and expansion cistern for small domestic properties is 18 Litres.
- Hot flushing system contents removes flux residue before adding a corrosion inhibitor to a new central heating system.
- The maximum recommended clip distance for a 15mm vertical copper pipe is 1200mm.
- A central heating system that includes a single feed indirect cylinder is supplied with water from the feed and expansion cistern.
- Connections to radiators in domestic properties are usually made Bottom Opposite End (BOE).
- The open vent pipe should rise 450mm above the water level in an open vented fully pumped heating system.
- It is normally a requirement to insulate central heating pipework under a suspended timber ground floor.
- Before turning off the central heating system in a private house for maintenance, the householder should be informed.
- The "neutral point" in a central heating system is the point at which the cold feed pipe connects to the system.
- An incorrectly adjusted circulating pump could cause a loud whistling noise from thermostatic radiator valves in a central heating system.
- An automatic bypass valve ensures sufficient flow rate through the boiler when TRVs begin to turn off in a central heating system.
- No system bypass when fitted with thermostatic radiator valves could cause a repeatedly renewed pump in a central heating system.
- Remove the head on the thermostatic rad.valve and secure the pressure pin with a retaining cap, before removing a radiator when the heating is to be kept on during work.
- When fully draining down a heating system, the air vents should be opened.
- Combination boilers are designed to provide domestic hot water and hot water heating.
- Best practice when branching a large new radiator circuit into an existing heating circuit in cold weather is to install the new radiators and pipework runs before branching in.
- The minimum size for a primary cold feed for a hot water heating system is 22mm.
- 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 F&E cistern should be set to allow for thermal expansion.
- The connection of an open vent pipe and a cold feed pipe can be made to a fully pumped system using an injector tee.
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