MOCK CENTRAL HEATING

What type of central heating component is shown in figure 1?

• Air separator.

• Automatic air vent.

• Radiator valve.

• Double check valve.

Answer explanation

The component shown is an automatic air vent, which is designed to release trapped air from the heating system, ensuring efficient operation. This distinguishes it from the other options listed.

Which British Standard includes detail on the requirements for installing open vented central heating systems?

• BS 5449.

• BS 6700.

• BS EN 12056.

• BS EN 12976.

Answer explanation

BS 5449 specifically covers the requirements for installing open vented central heating systems, making it the correct choice among the options provided.

What is the recommended actual capacity of a feed and expansion cistern for use in a small domestic property?

• 4 litres.

• 12 litres.

• 18 litres.

• 58 litres.

Answer explanation

The recommended actual capacity of a feed and expansion cistern for a small domestic property is 12 litres. This size ensures adequate water supply while preventing overflow and maintaining system efficiency.

What type of central heating component is shown in figure 2?

• Mid position valve.

• Automatic air vent.

• Air separator.

• F&E cistern.

Answer explanation

The component shown in figure 2 is an air separator, which is used to remove air from the heating system, ensuring efficient operation. The other options do not serve this specific function.

In the following diagram of an air separator (figure 3), which port should the open vent pipe be connected to?

• port 1

• port 2

• port 3

• port 4.

Answer explanation

The open vent pipe should be connected to port 3, as it is typically designated for venting gases or air in an air separator system, ensuring proper operation and preventing pressure buildup.

What type of radiator is shown in figure 4?

• Single panel radiator.

• Single panel radiator with convector.

• Double panel radiator.

• Double panel radiator with convector.

Answer explanation

The radiator in figure 4 is identified as a double panel radiator with convector due to its two panels and the presence of convector fins, which enhance heat distribution compared to single panel options.

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 residues.

• Charging the system with a nitrogen/air mix.

• Treating the water with sodium hypochlorite.

• Disinfection of the system contents to protect against legionella.

Answer explanation

Hot flushing is essential to remove flux residues that can cause corrosion. Adding a corrosion inhibitor without this step may lead to ineffective protection and potential damage to the heating system.

What is the maximum recommended clip spacing distance for a 15 mm vertical copper pipe?

• 1000 mm.

• 1200 mm.

• 1500 mm.

• 1800 mm.

Answer explanation

The maximum recommended clip spacing for a 15 mm vertical copper pipe is 1200 mm. This spacing helps ensure proper support and minimizes the risk of sagging or damage to the pipe.

Which one of the following points in figure 5 is an acceptable location for an automatic bypass valve to a pumped central heating system? (Figure 5 is referenced for this question.)

• Position 1.

• Position 2.

• Position 3.

• Position 4.

Answer explanation

Position 3 is the correct location for an automatic bypass valve in a pumped central heating system, as it allows for proper flow regulation and prevents overheating, ensuring efficient system operation.

The main reason for allowing enough space between the top of a radiator and an overhanging windowsill is to

• provide space for access with a vacuum cleaner

• allow the windowsill to be easily painted

• allow the heat from the radiator to circulate freely

• allow the windowsill to be easily removed.

Answer explanation

The main reason for allowing space between the radiator and the windowsill is to allow the heat from the radiator to circulate freely. This ensures efficient heating and prevents heat buildup, which can affect performance.