PPT 2 - Central heating system principles

What does the term 'gravity circulation' refer to in older systems?

• Use of a pump to circulate heat

• Principle of convection to circulate heat

• Use of electricity to circulate heat

• Principle of radiation to circulate heat

Why are modern CH systems more efficient than older systems?

• They use larger pipes

• They incorporate a circulator or pump

• They rely solely on gravity

• They use less energy

What is a characteristic of a 'C Plan' system?

• It uses only gravity for all circuits

• It uses only pumps for all circuits

• It combines pumped heating circuits with gravity for hot water primary circuits

• It uses solar power for heating

What is a drawback of the one-pipe semi-gravity system?

• It requires multiple boilers.

• It results in each radiator being progressively cooler.

• It is more costly to install.

• It uses a complex circuit system.

What is the diameter of the primary flow pipe in a one-pipe semi-gravity system?

• 15mm

• 22mm

• 28mm

• 35mm

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

• High efficiency

• Cheap to install

• Compliant with Building Regulations part L

• Controlled room temperature

Why might a one-pipe semi-gravity system not be compliant with Building Regulations part L?

• It is too expensive

• It uses high efficiency boilers

• It has uncontrolled room temperature

• It is cheap to install

What is the primary function of the open vent pipe in a one-pipe semi-gravity system?

• To increase water pressure

• To provide a safety outlet

• To reduce water temperature

• To block air escape

Why should the open vent pipe not have any valves attached?

• It could increase water flow

• It could cause overheating

• It could have disastrous effects if blocked

• It could reduce system efficiency

What does the open vent allow while filling the system with water?

• Water to escape

• Air to escape

• Heat to escape

• Pressure to increase