What is the main purpose of central heating?

To provide thermal comfort within a property

How does central heating differ from an open fire?

Central heating can give heat in every room

Central heating provides heat in one room only

An open fire provides heat in every room

An open fire cools the property

What is thermal comfort?

The desired heat balance between the body and surroundings

The balance of light and darkness in a room

The cooling effect of air conditioning

What is the main feature of full central heating?

It heats all rooms in a property at the same time.

It heats only selected rooms in a property.

It does not work when the outside temperature is -1°C.

It allows for individual room temperature control.

What distinguishes selective central heating from full central heating?

It allows the customer to select which rooms to heat.

It heats all rooms in a property.

It cannot reach the comfort temperature when outside is -1°C.

It is more energy-efficient than full central heating.

What is a characteristic of background central heating?

It is installed mainly on a cost basis and heats rooms to a lower temperature.

It uses a larger boiler to heat rooms to a high temperature.

It always achieves the desired comfort temperature regardless of outside conditions.

It is the same as full central heating.

When is a heating system classified as background heating?

When it cannot achieve the desired comfort temperature at -1°C outside.

When it heats rooms to a high temperature.

When it uses the largest boiler available.

When it is installed for aesthetic purposes.

What change in fuel usage has been observed over the years in heating systems?

From solid fuel to gas, oil, and electricity

What are customers concerned about regarding heating systems?

Both installation and running costs

Neither installation nor running costs

What are the two main categories of modern domestic central heating systems based on?

The way the system is filled with water and the pressure it operates at

How are low pressure, open vented systems fed?

From a feed and expansion cistern located at high level

Directly from the mains cold water

What is a characteristic of sealed, pressurised systems?

They incorporate an expansion vessel for heated water

They use gravity to circulate water

They are fed from a feed and expansion cistern

What are the two main categories of wet central heating systems?

System boiler and combination boiler systems

What type of system is characterized by using two two-port motorised valves?

System using two two-port motorised valves

System using one three-port mid-position valve

Two-pipe reversed return system

What type of systems use convection currents to circulate water around the pipework?

Gravity or semi gravity systems

What is required for full gravity systems to allow convection to work properly?

Large diameter pipework laid at the correct fall

Small diameter pipework laid horizontally

Why was the heat-up time lengthy in full gravity systems?

There was no pump in the system

What happens if the system is converted to pumped?

The air lock separating the two waters will be lost

What is a key advantage of the one pipe gravity system?

It relies on gravity, reducing installation costs.

It uses multiple pipes for better efficiency.

It is more expensive to install.

It heats each radiator equally.

What is a drawback of the one pipe gravity system?

Each radiator becomes progressively cooler.

What is the primary function of the central heating circulating pump in a one pipe gravity system?

To circulate water through the system

In a one pipe gravity system, what is the purpose of the feed and expansion cistern?

To provide a reservoir for water expansion

What is one advantage of a one pipe gravity system?

Compliant with Building Regulations part L

Which of the following is a disadvantage of a one pipe gravity system?

Each radiator progressively heats up

Compliant with Building Regulations part L

Why might a one pipe gravity system not be compliant with regulations?

It is not compliant with Building Regulations part L

It is compliant with Building Regulations part L

In the two pipe semi gravity system, what is the purpose of having separate pipes for flow and return?

To force water into the heat emitters

To mix the flow and return waters

What was the function of the room stat in the two pipe semi gravity system?

To control the hot water temperature

To mix the flow and return waters

What is one advantage of a two pipe semi gravity system?

All heat emitters reach the same temperature

Not compliant to Building Regulations part L

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What does BS EN 12828 pertain to?

Which regulation is concerned with the conservation of fuel and power?

What is BS 442 related to?

What does CHeSS stand for?

What does L1a refer to in the Building Regulations part L: Conservation of fuel and power?

Which section of the Building Regulations part L deals with existing dwellings?

What is the focus of L2a in the Building Regulations part L?

Which section of the Building Regulations part L applies to existing, other than dwellings?

What is the main purpose of central heating?

How does central heating differ from an open fire?

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