PP 11 Central Heating System Quiz

What is the recommended test duration according to BS14336?

• 3 hours

• 2 hours

• 1 hour

• 4 hours

What is the system test pressure for a sealed system with an operating pressure of 1 bar?

• 0.5 bar

• 1 bar

• 2 bar

• 1.5 bar

What is the purpose of cold flushing a central heating system?

• To remove excess flux

• To remove debris from the installation process

• To remove excess jointing compounds

• To remove hydrogen from the system

What is the process of releasing trapped air or hydrogen from the top of a radiator called?

• Balancing

• Bleeding

• Flushing

• Filling

What should be done before working on any electrical component, including the boiler?

• Lock off the fuse holder ( safe isolation )

• Remove the fuse from the boiler

• Switch off the central heating system

• Switch off the boiler

What is the purpose of balancing the system when the system is commissioned?

• To switch off the central heating system

• To remove hydrogen from the system

• To remove debris from the installation process

• To ensure uniform heating of radiators

What is the recommended temperature difference between the flow and return pipework when the system is warm?

• 10ºC

• 9ºC

• 8ºC

• 11ºC

What is the purpose of a hot flush in a central heating system?

• To remove debris from the installation process

• To remove hydrogen from the system

• To remove excess jointing compounds

• To remove excess flux residues and oils

What is the purpose of a power flush in an older central heating system?

• To remove debris from the installation process

• To remove hydrogen from the system

• To remove excess jointing compounds

• To remove blockages in the system

What is the purpose of venting in a central heating system?

• To remove blockages in the system

• To remove excess jointing compounds

• To remove debris from the installation process

• To release trapped air or hydrogen