Plumbing level 2 - PP 1.2 - Central Heating

What is the main purpose of the Feed and Expansion (F&E) cistern?

• To store cold water for household use

• To allow heated water in the system to expand and operate at atmospheric pressure

• To heat the water in the system

• To filter impurities from the water

Where should the 15mm cold feed be located in the F&E cistern?

• At the same level as the cold water storage cistern

• At the bottom of the cistern

• On the side of the F&E without any valves

• On the top of the cistern

What is the minimum height the 22mm open vent must rise above the water level in the F&E?

• 1 meter

• 600mm

• 450mm

• 300mm

What is the primary function of the open vent pipe?

• To filter the water in the system

• To provide a safety outlet should the system overheat

• To heat the water in the system

• To store excess water

What is the purpose of an air separator in a central heating system?

• To store excess water

• To separate air from the water, reducing noise and corrosion

• To filter impurities from the water

• To heat the water

What is the function of a two port motorised valve?

• To allow hot water and heating circuits to be controlled separately

• To heat the water in the system

• To filter impurities from the water

• To control the flow of water to both heating and hot water circuits

Where is the cylinder thermostat typically situated?

• At the bottom of the hot water cylinder

• One-third of the way up a hot water cylinder

• At the top of the hot water cylinder

• On the side of the hot water cylinder

What is the purpose of a magnetic system cleaner?

• To separate air from the water

• To heat the water in the system

• To collect corroded iron particles (magnetite) and keep the system water in good condition

• To store excess water

What is the function of an inhibitor in a central heating system?

• To heat the water in the system

• To protect against scale and corrosion

• To separate air from the water

• To store excess water

What is the purpose of balancing the system using the lock shield valve?

• To store excess water

• To filter impurities from the water

• To ensure radiators warm up uniformly and maintain a 10°C temperature difference between flow and return pipework

• To heat the water in the system